Page 1 COMSPHERE MODEMS MODELS 3920P AND 3921P TECHNICAL REFERENCE MANUAL Document No. 3920-A2-GH30-40...
Page 2 COMSPHERE 392xP MODEMS MODELS 3920P AND 3921P TECHNICAL REFERENCE MANUAL Document No. 3920-A2-GH30-40 October 1998...
Page 3: Comsphere 392Xplus Modems
Firmware Update Description document to this manual. For the Model 3920Plus standalone modems, the Universal Service Order Code (USOC) for Permissive mode is RJ11C. The Canadian equivalent to RJ11C is CA11A. For the 3921Plus carrier-mounted modems, the USOC for Permissive mode is RJ21X.
Page 4: Important Safety Instructions
Important Safety Instructions Read and follow all warning notices and instructions marked on the product or included in the manual. Some models are provided with a three-wire grounding type plug – a plug which has a grounding pin. This is a safety feature. Equipment grounding is vital to ensure safe operation. Do not defeat the purpose of the grounding type plug by modifying the plug or using an adapter.
Page 5 COMSPHERE 392xPlus Modems Notices THIS EQUIPMENT HAS BEEN TESTED AND FOUND TO COMPLY WITH THE LIMITS FOR A CLASS A DIGITAL DEVICE, PURSUANT TO PART 15 OF THE FCC RULES. THESE LIMITS ARE DESIGNED TO PROVIDE REASONABLE PROTECTION AGAINST HARMFUL INTERFERENCE WHEN THE EQUIPMENT IS OPERATED IN A COMMERCIAL ENVIRONMENT.
Page 6: Table Of Contents
Model 3920Plus Modem Installation ......Connecting Cables to the Model 3920Plus Modem Removing and Replacing the Model 3920Plus Modem Model 3921Plus Modem Installation .
Page 7 COMSPHERE 392xPlus Modems 4. Status Branch 5. Configure Branch 6. Poll List Branch 7. Control Branch 8. Test Branch 9. Sub-Network Health and Status Branch 10. Call Setup Branch 11. Talk/Data Branch 12. Dial Access Security 13. Remote Branch Status Branch .
Page 8 14. AT Command Set and S-Registers Appendices Glossary Index 3920-A2-GH30-40 Overview ..........Command and Data Modes .
Page 9 3920-A1 Standalone Singleport and Multiport Modems Model 3921Plus Singleport Modem Model 3921Plus Multiport Modem Model 3920Plus Singleport (3920-A2-xxx) Back Panel and Power Supply Model 3920Plus Multiport Back Panel and Power Supply Model 3921Plus Back Connector Plates Installing the Model 3921Plus Modem...
Page 10 Table 392xPlus Operational Modes Technical Specifications for 392xPlus Modems 392xPlus DCP LEDs SDCP LEDs Top-Level Menu Status Common Operational Messages Dial Access Security Messages Health and Status Messages SDC Performance Measurements Backup Status Screens DTE Interface Configuration Options — Multiport Mode Line Dialer Configuration Options —...
Page 11 COMSPHERE 392xPlus Modems Table Modem Health Leased-Line Operation Dial Backup Operation Modem — DTE Connection Modem — VF Connection Online Operation Misc Operation Mux Operation EIA-232-D Pin Assignments VF Connector Pin Assignments V.25bis Commands V.25bis Response Messages ASCII Characters Factory Default Configuration Options SDC Negotiation Configuration Scenarios .
Page 12: Preface
Objectives and Reader Assumptions This manual describes how to install and operate the COMSPHERE Model 3920Plus standalone and Model 3921Plus carrier-mounted modems. Users of this manual must have a basic understanding of modems and their operation. How to Use This Manual...
Page 13: Related Documents
COMSPHERE 3000 Series Carrier, Installation Manual 3600 Hubbing Device, Feature Number 3600-F3-300, Installation Instructions COMSPHERE 3900 Series Modems, Model 3921Plus, Ferrite Choke, Installation Instructions COMSPHERE 392xPlus Modems, Models 3920Plus and 3921Plus, Installation Instructions COMSPHERE 392xPlus Modems, Model Number 3920-A2-411, Installation Instructions October 1998...
Page 14: Introduction
........Model 3920Plus Standalone Singleport Modems Model 3920Plus Standalone Multiport Modem...
Page 15: Comsphere 392Xplus Models
A reference to 392xPlus modems refers to all 3920Plus and 3921Plus models. Model 3920Plus Standalone Singleport Modems The Model 3920Plus singleport (Figures 1-1 and 1-2) is a standalone modem capable of either 4-wire/2-wire leased-line or dial operation. This modem is controlled using either AT commands or the DCP.
Page 16: A1 Standalone Singleport And Multiport Modems
Model 3920Plus Standalone Multiport Modem The Model 3920Plus multiport is a standalone modem (Figure 1-2), with an integral time division multiplexer (TDM) and a modem sharing device (MSD) as standard equipment. The TDM provides time division multiplexing of up to four independent ports over point-to-point lines using the V.34 family or V.32 family modulation.
Page 17: Model 3921Plus Singleport Modem
COMSPHERE 392xPlus Modems Model 3921Plus Singleport Carrier-Mounted Modem The Model 3921Plus singleport is a carrier-mounted modem (Figure 1-3) capable of either 4-wire/2-wire leased-line or dial operation. The modem installs into a COMSPHERE 3000 Series Carrier, occupying a single slot. The modem’s faceplate has sixteen (16) LED status indicators for displaying modem activity and an audio speaker jack for the carrier’s optional speaker.
Page 18: Model 3921Plus Multiport Modem
The user interface to any Model 3921Plus modem is through the shared diagnostic control panel (SDCP), an optional feature which operates in a manner similar to the DCP on the Model 3920Plus modems. For a better understanding of DCP operation, refer to Chapter 3, Operation.
Page 19: 392Xplus Operational Modes
COMSPHERE 392xPlus Modems 392xPlus Operational Modes The 392xPlus operational modes determine how your modem performs in various applications. These operational modes are determined by your modem model and the selected configuration options. There are two operational modes: • Singleport. Operates on both the singleport and multiport modem models. The Singleport mode only supports one port (DTE 1).
Page 20: 392Xplus Modem Features
392xPlus Modem Features The 392xPlus modems share a wide variety of features. • Asynchronous DTE rates of 115.2 kbps and 76.8 kbps. • Asynchronous data compression and error correction. • Synchronous data compression. • Additional VF parameters under the V.32 and V.34 family modulations in 4-wire mode. •...
Page 21: Applications
COMSPHERE 392xPlus Modems Applications Multipoint Multipoint is available in all 392xPlus modem models. It utilizes leased-line circuits for time sharing the same front-end processor (FEP) port with multiple remote locations. The FEP (via the control modem) regulates traffic on the line by continuously polling the tributary DTE(s) in a predefined sequence.
Page 22: V.34 Modulation
When the Digital Bridging feature is enabled, a new menu is present with the following conditions: • TDM capability is disabled when DTE Bridge configuration option is set to Enable, therefore the rate of Port 1 is forced to run at the line rate. •...
Page 23: Government Requirements And Equipment Return
FCC registration number and ringer equivalence number (REN) for this equipment. The label is located on the bottom of the Model 3920Plus modem and on the modem’s circuit card assembly on the Model 3921Plus. If requested, this information must be provided to the telephone company.
Page 24 4. The ringer equivalence (REN) is used to determine the quantity of devices which may be connected to the telephone line. Excessive RENs on the telephone line may result in the devices not ringing in response to an incoming call. In most, but not all areas, the sum of the RENs should not exceed five (5.0).
Page 25: Canada
COMSPHERE 392xPlus Modems Canada NOTICE TO USERS OF THE CANADIAN PUBLIC SWITCHED TELEPHONE NETWORK The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operational, and safety requirements. The Department does not guarantee the equipment will operate to the user’s satisfaction.
Page 26: Technical Specifications
8 watts (typical, including power supply, speaker off) 6 watts (typical, each card) (Speaker consumption is approximately 1 watt at high volume.) 2.5 pounds (1.14 kg) Model 3920Plus (without power supply) 1.0 pounds (0.45 kg) Model 3921Plus 2.1 inches (5.4 cm) Model 3920Plus 7.1 inches (18.1 cm) Model 3921Plus...
Page 27 COMSPHERE 392xPlus Modems Technical Specifications for 392xPlus Modems Specifications TRANSMIT LEVEL Leased Line (North America) Leased Line (All Other Countries) Dial Line (North America) Dial Line (All Other Countries) COMPATIBILITY ERROR CONTROL DATA COMPRESSION 1-14 Table 1-2 (2 of 2) Description 0 through –15 dBm (in 1 dBm decrements) Factory default is 0 dBm...
Page 28: Modem Installation
Overview 392xPlus Modem Package Model 3920Plus Modem Installation Connecting Cables to the Model 3920Plus Modem Removing and Replacing the Model 3920Plus Modem Model 3921Plus Modem Installation Removing the Model 3921Plus Modem 392xPlus Modem Power-Up Selecting Factory Configuration Options Overview This chapter provides a list of equipment supplied with 392xPlus modems, as well as a list of customer supplied equipment.
Page 29 Customer-Supplied Equipment The following customer-supplied equipment is required to complete a data communications system using the Model 3920Plus modem: • One (singleport) or four (multiport) DTEs with available EIA-232-D serial port(s). • Standard EIA-232-D cables with one (singleport) or four (multiport) DB-25-P connectors at one end to attach to the modem.
Page 30: Model 3920Plus Modem Installation
DTE should be minimized if DTE data rates exceed 19,200 bps. Also, low capacitance cables may be necessary for speeds greater than 19,200 bps or distances greater than 50 feet. The back panel of the Model 3920Plus modem connectors: •...
Page 31: Model 3920Plus Singleport (3920-A2-Xxx) Back Panel And Power Supply
COMSPHERE 392xPlus Modems LEASED LEASED-LINE NETWORK 8-POSITION PLUG DIAL NETWORK 6-POSITION PLUG Figure 2-1. Model 3920Plus Singleport (3920-A2-xxx) Back Panel and Power Supply DIAL DTE 1 DATA TERMINAL EQUIPMENT DB-25-P CONNECTOR SUB-MINIATURE 4-POSITION PLUG FOR HUBBING NETWORK DEVICE MANAGEMENT SYSTEM...
Page 32: Model 3920Plus Multiport Back Panel And Power Supply
LEASED-LINE NETWORK 8-POSITION, 8-CONDUCTOR PLUG NETWORK 6-POSITION, 4-CONDUCTOR PLUG LEASED BACKUP 8-POSITION, 8-CONDUCTOR PLUG Figure 2-2. Model 3920Plus Multiport Back Panel and Power Supply 3920-A2-GH30-40 DB-25-S CONNECTORS DTE 2 DTE 3 DTE 1 DATA TERMINAL EQUIPMENT DB-25-P CONNECTOR DIAL NETWORK...
Page 33 COMSPHERE 392xPlus Modems Data Terminal Equipment Connection Use the following steps to connect an EIA-232-D cable from the modem to a DTE: 1. Make sure the modem is powered OFF. 2. Connect the DB-25-P (plug) connector on the cable to the first or only DB-25-S (socket) connector screwdriver to secure the cable to the modem.
Page 34 1. Insert the 8-position, 8-conductor modular plug into the jack labeled LEASED (Figure 2-1 2. Insert the other end of the modular cord into the leased-line network interface. 3. If the Model 3920Plus has a backup line, follow the steps listed in the Connection Dial Network Connection The telephone company provides the line termination jacks for the permissive service you request.
Page 35: Removing And Replacing The Model 3920Plus Modem
COMSPHERE 392xPlus Modems Removing and Replacing the Model 3920Plus Modem To remove and replace the Model 3920Plus modem, perform the following steps: 1. Make sure the modem is offline. Press the modem’s back panel power switch to OFF. 2. Disconnect the power cord from the ac power outlet.
Page 36: Model 3921Plus Back Connector Plates
MULTIPORT CONNECTOR PLATES PORT 3 PORT 4 Figure 2-3. Model 3921Plus Back Connector Plates 2. At the front of the carrier, hold the modem vertically, with the latch on its faceplate in the open position, and insert it into the top and bottom card guides of one of the slots numbered 1–15 Slide the modem into the slot, aligning the modem with the connector plates, until the backplane connector and DTE connector seat firmly into the back of the carrier.
Page 37: Installing The Model 3921Plus Modem
COMSPHERE 392xPlus Modems 3000 SERIES CARRIER MODEL 3921Plus SINGLEPORT MODEM LATCH CIRCUIT CARD GUIDES 3000 SERIES CARRIER MODEL 3921Plus MULTIPORT MODEM LATCH CIRCUIT CARD GUIDES 495-14708 Figure 2-4. Installing the Model 3921Plus Modem 2-10 October 1998 3920-A2-GH30-40...
Page 38 If the Model 3921Plus modem is to communicate with an installed SDCP, install the modem as described above and perform the following steps: 1. Press the slot selection position (01 on the first LCD line in following screen example). 2. Press the F1 ( " ) or F2 ( # ) key until the slot number you want appears. 3.
Page 39: Circuit Pack Lock
COMSPHERE 392xPlus Modems 6. When the modem is installed properly and the power-up self-test completes, rotate the circuit pack lock until it covers the faceplate latch (Figure 2-5). Tighten the retention screw on the circuit pack lock. This prevents the modem from accidently being removed once it is installed in a carrier.
Page 40: Removing The Model 3921Plus Modem
Removing the Model 3921Plus Modem When removing the Model 3921Plus modem from the carrier, always use a ground strap when handling the modem. Always store the Model 3921Plus modems in an antistatic bag when it is removed from the carrier. It is not necessary to power down the carrier to remove the Model 3921Plus modem.
Page 41 COMSPHERE 392xPlus Modems configuration, then you must change the factory setting using either the modem’s DCP (as described in the following sections) or the AT command set. The purpose of having preset configurations is so that you can have a “head start” in getting your modem operating and reducing the amount of time required to configure your modem.
Page 42: Dcp Operation
There are two types of diagnostic control panels (DCP), the DCP on the standalone Model 3920Plus modems and the shared diagnostic control panel (SDCP), an optional feature, used with the Model 3921Plus installed into a COMSPHERE 3000 Series Carrier. Both DCPs have...
Page 43: Status Indicators
Status Indicators The 392xPlus modem status indicators continuously provide information on the modem’s operating condition. All of the status indicators on the Model 3920Plus appear on the DCP (Figure 3-1), whereas the status indicators for the carrier-mounted Model 3921Plus are located on the Model 3921Plus modem’s faceplate and the SDCP faceplate...
Page 44: Optional Sdcp And Model 3921Plus Faceplates
MULTIPORT SINGLEPORT Status Status Status Alrm Alrm Alrm Diag Test Test Diag Dial Dial Busy Busy Serv Serv Port Front Panel Front Panel Spkr Spkr 3921Plus 3921Plus SELECT STATUS INDICATORS OK Alarm BckUp Test NETWORK DEVICE ALARM DIAL BACKUP Figure 3-2. Optional SDCP and Model 3921Plus Faceplates 3920-A2-GH30-40 CARRIER SLOTS 1–16 Select...
Page 45: Xplus Dcp Leds
ON – A major alarm has been detected in the local modem. (For Health and Status alarm conditions, refer to Diag green The modem is receiving diagnostic communications (either a command or a status poll). (3920Plus only) Test/142 yellow Flashing – The modem is involved in a firmware upgrade. Normal operation is not possible.
Page 46: Sdcp Leds
* The selected port is one of the mux ports (1, 2, 3, or 4) or the Network Management System (NMS) diagnostic interface (3920Plus only). For example, when the selected port is Port 1 of the mux, the EIA indicators for TXD, RXD, RTS, CTS, DSR, DTR, and LSD will indicate the status of the EIA signals on the Port 1 interface of the multiplexer.
Page 47: Diagnostic Control Panel Operation
COMSPHERE 392xPlus Modems Diagnostic Control Panel Operation The 392xPlus modem’s diagnostic control panel (DCP) is the user interface to all functions used to configure and control the modem. In addition to the status LEDs, this interface includes the liquid crystal display (LCD) and keypad (Figure 3-3). LCD TOP LINE MOVES UP ONE...
Page 48: Other Indicators
Out of Range indicator, refer to Keypad The DCP on the Model 3920Plus has seven keys while the optional SDCP of the COMSPHERE 3000 Series Carrier has eight keys. The additional key on the carrier is the connect the SDCP to a specific slot in the carrier.
Page 49: Menu Structure
COMSPHERE 392xPlus Modems Function keys F1, F2, and F3 select the LCD choice that appears above the function key. If the displayed LCD choice spans more than one function key, then any of the function keys can select that choice. (The screen examples in this manual use the F1 key to illustrate selection when multiple function keys select the choice.) Key (Model 3921Plus only) Select...
Page 50 The menu tree contains the following branches: Quick Config — Status Configure PList Control Test SubHS Call Setup Talk/Data Security Remote 3920-A2-GH30-40 Used to display the basic operational characteristics of the modem. — Used to monitor the current status of the VF line and DTE interface as well as view the identity of the modem.
Page 51: Top-Level Menu Status And Operational Messages
COMSPHERE 392xPlus Modems Top-Level Menu Status and Operational Messages Access to all menu tree branches from the DCP begins at the Top-Level menu, the head of the menu hierarchy. The LCD’s top line identifies the modem status, as listed in Table 3-3, while the bottom line displays the main menu tree branches as well as operational and security messages, as listed in Table 3-4...
Page 52 Status Message Call Failure Busy Signal Delayed Number { Dial Line in Use Forbidden Number { Invalid Number Line Occupied{{ No Answer Tone No Dial-DTR No Dial-Test No Dial Tone No Quiet Answer Ringback Timeout Trunk Busy Wrong Call { The Delayed Number and Forbidden Number messages appear only in countries where the number of repeat call attempts are restricted.
Page 53 COMSPHERE 392xPlus Modems Status Message Call Disconnect ATH Disconnect Bad Lines Disc No Carrier Disc DTR Disconnect EC Disconnect Inv Rate Disc LnCurrnt Disc LongSpace Disc NoData Disc Disconnecting RmtCmnded Disc Talk Mode Firmware DownldOnly Download Result Mode Frmware Upgrade RemClone Failed Remote Clone Bcast Clone Done...
Page 54: Common Operational Messages
Messages listed in Table 3-4 are common operational messages that occur during modem operation. These messages normally appear on the second line of the LCD. Common Operational Message Please Wait... A command to a local device takes more than two seconds to complete. Command Sent...
Page 55: Quick Configuration Display
COMSPHERE 392xPlus Modems Quick Configuration Display The Quick Configuration display indicates the basic operational characteristics of the modem. The modem’s Quick Configuration information appears on the LCD’s bottom line. To access the Quick Configuration display from the Top-Level display, press the on the configuration of the modem, one of two screens appears.
Page 56 The following provides information about the Quick Configuration LCD display. ffff xxxx yyyyy To exit the Quick Configuration function and return to the Top-Level menu, press the key. 3920-A2-GH30-40 Displays the network position of the modem. The letter C indicates this is a control modem, and T indicates this is a tributary modem.
Page 57 COMSPHERE 392xPlus Modems This page intentionally left blank. 3-16 October 1998 3920-A2-GH30-40...
Page 58 Diagnostic Control Panel Access This page of the manual is self supporting and can be removed to prevent unwanted knowledge of the DCP security access selections. Use the DCP security access function to “lock” the DCP of any 392xPlus modem and prevent unwanted user access.
Page 59 COMSPHERE 392xPlus Modems 3-18 October 1998 3920-A2-GH30-40...
Page 60 Status Branch Status Branch The Status branch of the Top-Level menu allows you to view the current status of the leased-line or dial connection, the identity (for example, serial number and model number) of your equipment, and the DTE interface. 3920-A2-GH30-40 Status Branch .
Page 61 COMSPHERE 392xPlus Modems Configure PList Status DeviceHS Identity Display Clear Major Ser# Minor Mod# Status FRev SigQual Dial HPt# RcvLevel Thresh FPt# Sig/Noise Security Country NrEchLvl Port1 FarEchLv Port2 FarEchDel Port3 EchoFreqOff Port4 Phase Hts Impul Hts DropOuts Retrains Phas Jtr NonLinear FreqOffset Gain Hts...
Page 62: Status Branch
Device Health and Status (DeviceHS) DeviceHS provides a ‘‘snapshot” of current modem alarms which are active at the time the DeviceHS function is selected. To access DeviceHS from the Status branch, make the following selection: Select DeviceHS. If alarms are present, press the appropriate function key to view the messages associated with these alarms (Table alarms are present, the word Normal appears on the LCD.
Page 63 COMSPHERE 392xPlus Modems Type Message Status Subtree Truncate Test Mode Disabled On Dial Backup FW Downloading Primary Line Good Backup Line Bad Data Blocked On Lease Backup PSTN Test Fail Dial Make Busy Mode Service Line Short Hold Time Non-Answering Thresh* RSL High Threshd RSL Low Threshld...
Page 64 Type Message Security Database Reset Password Protect Mode Change Password Change Database Change Ports 1 Rx Data Alarm Ports 2 Tx Data Alarm Ports 3 Ports 3 Ports 4 DTR Alarm CTS Alarm RTS Alarm DSR Alarm LSD Alarm Auto Stream Dis Disabled To exit DeviceHS and remain in the Status branch, press the Top-Level menu, press the...
Page 65: Displaying Vf Conditions
COMSPHERE 392xPlus Modems Displaying VF Conditions To display VF conditions, select Display from the Status:VF screen. If the modem is receiving a signal, the signal quality appears on the LCD’s bottom line. If the modem is not receiving a signal, the message No Signal appears. Press the Not all conditions are available at 4800 bps.
Page 66: Clearing Vf Counters
EchoFreqOff Phase Hts Impul Hts DropOuts Retrains Phas Jtr NonLinear FreqOffset Gain Hts Clearing VF Counters The Clear command resets the retrain, impulse hits, gain hits, phase hits, and drop outs. To clear the VF counters, select Clear. 3920-A2-GH30-40 Echo Frequency Offset displays the frequency offset of the far end echo. This parameter appears for V.34, V.32terbo, V.32bis, and V.32 modulations (in 2-wire only).
Page 67: Identity
Serial number is an 8-digit number that identifies the modem. Model number is an alphanumeric number that identifies the modem as either a Model 3920Plus or Model 3921Plus modem. Firmware revision level is an alphanumeric number that identifies the level of firmware loaded in the modem.
Page 68: Dte
To exit the Identity function and remain in the Status branch, press the return to the Top-Level menu, press the DTE displays the state and/or activity of the following interface leads: LSD, DTR, DSR, TST, TXD, RXD, RTS, and CTS. The interface leads status is updated every 5 seconds. To access DTE from the Status branch, make the following selections: Press the Select the appropriate port by pressing the corresponding function key.
Page 69: Sdc
COMSPHERE 392xPlus Modems When running synchronous data compression, the SDC function displays information about the modem’s transmitting and receiving DTE rate, compression ratio, and line efficiency. Once a connection terminates, the last valid parameters are locked in place until the next connection. To access SDC from the Status branch, make the following selections: Select SDC.
Page 70: Sdc Performance Measurements
Group DTE Rate The number of bits per second received from the DTE. This number takes into account only the data between the opening and closing flags of the HDLC frames. Flags and DTE interframe time fill are ignored. The number of bits per second sent to the DTE.
Page 71 COMSPHERE 392xPlus Modems If the modem is receiving a signal, the signal quality appears on the second LCD line. Press the key to scroll and view the V.34 modem receive rate, symbol rate, transmit rate, and asymmetric. If the modem is not receiving a signal, the message No Sync appears. TxRate RxRate SymbolRate...
Page 72: Backup
Backup The Status Backup function displays the configuration of the modem’s current operating line facility and the configuration and condition of the inactive line. The modem’s rear panel has two line interface jacks: LEASE and DIAL (see APL primary interface and accepts either 2-wire or 4-wire APL. The jack labeled DIAL is the backup interface and accepts either 2-wire APL (Dual Lease Line) or Dial lines.
Page 73: Backup Status Screens
COMSPHERE 392xPlus Modems Active Line Inactive Line 1st Screen Display 2nd Screen Display Line=Pri 4w APL Bckup:2wAPL=XXXX Line=Pri 2w APL Bckup : Dial =(blank) Line=Bkup 2w APL Pri 4w APL =XXXX Line = Dial Backup Pri 2w APL =XXXX Line=Dial Only No second screen display.
Page 74: Options
Options The Options Status function displays all optional firmware features currently installed in the modem. If no firmware options are installed, None_Installed appears on the LCD. To access Options from the Status branch, make the following sections: Press the If optional features are installed in the modem, they appear on the LCD’s bottom line. If other features are installed, press the To exit this function and remain in the Status branch, press the Top-Level menu, press the...
Page 75: Record
COMSPHERE 392xPlus Modems Record Record is a troubleshooting tool used in conjunction with support personnel. This function retrieves and reports any sequence faults to support personnel. A sequence fault is an irregular or unexpected event. There are two selections under Record: Display and Clear. Display allows up to eight sequence fault messages that are recorded by the modem and displayed on the LCD in descending order.
Page 76: Service Log
Service Log Service Log is a troubleshooting tool used in conjunction with support personnel. Use this function to retrieve and report Service Log data to support personnel. To access Service Log from the Status branch, make the following selections: Press the Support personnel will request the applicable information from this screen.
Page 77 COMSPHERE 392xPlus Modems 4-18 October 1998 3920-A2-GH30-40...
Page 78 Overview Configure Branch Configuration Tables Multiport Mode Singleport Mode Overview After installing a 392xPlus modem, its software configuration options must be set using the diagnostic control panel (DCP). This chapter describes how to access and use the Configure branch of the Top-Level menu via the DCP. The Configure branch accesses the Edit Area which is a work space where you view and change the configuration options.
Page 79: Dcp Configuration Process
COMSPHERE 392xPlus Modems • Factory is a read-only (unchangeable) configuration area containing six sets of predefined configuration options labeled Sync Leased, Async Leased, TMp (Trellis Multipoint), Async Dial, Sync Dial, and UNIX Dial. If Sync Leased or Async Leased is selected, you must choose either Answer or Originate mode.
Page 80: Configure Branch
Configure Branch The Configure branch of the Top-Level menu contains all of the modem’s configuration options which determine how the modem operates. These configuration options are accessed by scrolling down and across various levels of the Configure branch. Status PList Configure Ld EditArea frm: Activ (Operating)
Page 81: Editing And Saving A Configuration Option
COMSPHERE 392xPlus Modems The Configure branch consists of the following three levels: • Ld EditArea frm. Allows the selection of the Active (Operating), Active (Saved), Customer 1, Customer 2, and Factory configuration areas. • Choose Function. Allows you to make changes (Edit) to existing configuration options or write (Save) these changes to either the Active (Saved), Customer 1, or Customer 2.
Page 82 Select Sync_Leased. Select Answer. Select Edit. Scroll across the LCD and select the Misc configuration options group. 3920-A2-GH30-40 Ld Fact Preset: > Sync_Leased Choose Mode: Answer Originate Choose Function: Edit Save Edit StrapGroup: > DTE_Interface Edit StrapGroup Test Misc October 1998 Configure Branch...
Page 83 COMSPHERE 392xPlus Modems Select Nxt until RemAccssPasswrd appears. Select the F2 ( " ) key to increment password values. Press the Continue this sequence until you have entered the new password value. StrapsWhenDisc > No_Change RemAccssPasswrd: "00000000 RemAccssPasswrd: "10000000 RemAccssPasswrd: "10000000 key to move the cursor to the next position.
Page 84 To save the new password to a configuration area, make the following selections: Press the Select Save. Select a configuration area (Active (Saved), Customer 1, or Customer 2) to save the changes. Select the branch. When using the DCP to edit configuration options, keep the following in mind: •...
Page 85: Configuration Tables
COMSPHERE 392xPlus Modems Configuration Tables Each modem operates in either the Multiport or Singleport mode depending on the modem’s configuration (refer to The modem’s configuration options are arranged into six groups in the Multiport mode, and nine groups in the Singleport mode. When using configuration option tables, be sure you are referencing the correct group (Multiport or Singleport mode).
Page 86: Multiport Mode
Line Interface Dialer Dialer AutoAnswerRing# Dialer Type DialTone Detect Blind Dial Paus BusyTone Detect "," Pause Time NoAnswer Timout Fast Disconnect Line Crnt Disc Long Space Disc No Carrier Disc No Data Disc Auto Make Busy Copy From Port X MUX Mode –TDM/MSD –DTE Bridge...
Page 87: Dte Interface - Multiport Mode
COMSPHERE 392xPlus Modems DTE Interface — Multiport Mode l The DTE Interface configuration options contain EIA-232-D (ITU-T V.24) and asynchronous character format information essential for maintaining a connection and for transmitting data between the DTEs and the modem. Table 5-1 shows each DTE Interface configuration option as it appears on the LCD, with the Sync Leased factory default setting (the default value if the modem is newly installed) shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 88 Configure Branch Table 5-1 (2 of 9) DTE Interface Configuration Options — Multiport Mode l Port4 Ext Alarm: Disable Nxt Disable EnableLow EnableHigh This configuration option only appears when MUX Mode is configured for TDM/MSD. Port 4 External Alarm Monitor. Determines if Port 4 can be used to transmit user data. When enabled, this configuration option prevents Port 4 of the modem from being used to transmit user data.
Page 89 COMSPHERE 392xPlus Modems DTE Interface Configuration Options — Multiport Mode l MSD Port Control: Host Nxt Host Modem This configuration option does not appear when MSD is disabled. Modem Sharing Device Port Control. Host – The host computer determines the polling sequence that controls which port transmits at any given time. When the DTE/DCE equipment attached to a port raises RTS (Request-to-Send) it gets to use the channel.
Page 90 Configure Branch Table 5-1 (4 of 9) DTE Interface Configuration Options — Multiport Mode l Rate at 14.4 K Nxt Disable 14400 12000 9600 7200 4800 2400 1200 Rate at 14.4K. When the modem rate is 14,400 bps the port rate will be as selected by this configuration option (Disable or 14400 to 1200).
Page 91 COMSPHERE 392xPlus Modems DTE Interface Configuration Options — Multiport Mode l Asyn #Data Bits: 8 Nxt 8 7 9 6 This configuration option only appears when Async/Sync Mode is configured for Async. Asynchronous Number of Data Bits. Determines if the asynchronous data length is composed of 6, 7, 8, or 9 data bits. This data length excludes start, parity, and stop bits.
Page 92 Configure Branch Table 5-1 (6 of 9) DTE Interface Configuration Options — Multiport Mode l DSR Control: Stndrd_RS232 Nxt Stndrd_RS232 Forced_On WinkWhenDisc Follows_DTR On_Early Delay_ToData Data Set Ready Control. DSR is a signal from the modem to the DTE indicating the modem is connected and ready for operation.
Page 93 COMSPHERE 392xPlus Modems DTE Interface Configuration Options — Multiport Mode l CTS Control: Stndrd_RS232 Nxt Stndrd_RS232 Forced_On WinkWhenDisc Follows_DTR Follows_RTS Clear-to-Send Control. CTS is a signal from the modem to the DTE indicating that it can accept data from the DTE. Standard RS232 –...
Page 94 Configure Branch Table 5-1 (8 of 9) DTE Interface Configuration Options — Multiport Mode l XTXC Clamps TXC: Enable Nxt Enable Disable This configuration option only appears when the TX Clock Source or Bakup_TXClk_Src configuration option is set to Port 1, 2, 3, or 4 and Async/Sync mode is Sync. External Transmit Clock Clamps Transmit Clock.
Page 95 COMSPHERE 392xPlus Modems DTE Interface Configuration Options — Multiport Mode l Port TXC Source: Internal Nxt Internal External Port Transmit Clock Source. Determines the clock source used to clock transmit data into the port buffer from Pin 2 (TXD) of the EIA-232-D interface. The port buffer is used to compensate for timing differences when a port is connected via a crossover cable to another modem’s EIA-232-D interface.
Page 96: Line Dialer Configuration Options — Multiport Mode
Line Dialer — Multiport Mode l The Line Dialer configuration options establish parameters used by the modem to answer or originate calls. Table 5-2 shows each Line Dialer configuration option as it appears on the LCD, with the Sync Leased factory default setting (the default value if the modem is just being installed) shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 97 COMSPHERE 392xPlus Modems Line Dialer Configuration Options — Multiport Mode l Blind Dial Paus: 2sec Nxt 2sec 4sec 6sec 8sec 10sec 20sec This configuration option only appears when Dial Tone Detect is disabled. Blind Dial Pause. Determines how long the modem waits before dialing a telephone number when Dial Tone Detect is disabled.
Page 98 Line Dialer Configuration Options — Multiport Mode l Long Space Disc: Enable Nxt Enable Disable Long Space Disconnect. Determines the modem’s response to a continuous spacing condition sent from the remote modem before it goes on-hook. Issuing a long space is one method of disconnecting a call. Enable –...
Page 99: Dial Line Configuration Options — Multiport Mode
COMSPHERE 392xPlus Modems Dial Line — Multiport Mode l The Dial Line configuration options are used to configure the modem for operation over dial lines. Table 5-3 shows each Dial Line configuration option as it appears on the LCD, with the Sync Leased factory default setting (the default value if the modem is just being installed) shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 100 Configure Branch Table 5-3 (2 of 3) Dial Line Configuration Options — Multiport Mode l Dial Tx Level: Permissv(–9) Nxt Permissv(–9) –10 –11 –12 –13 –14 –15 –16 –17 –18 –19 –20 –21 –22 –23 –24 –25 –26 –27 –28 –29 –30 –31 –32 Dial Transmit Level.
Page 101 COMSPHERE 392xPlus Modems Dial Line Configuration Options — Multiport Mode l Asymmetric Rate: Disabled End Enable Disable This configuration option only appears when V.34 is enabled. Asymmetric Rate. Controls rate symmetry when running V.34 modulation by enabling or disabling the V.34 modulation from using equal transmit and receive rates.
Page 102: Leased Line Configuration Options — Multiport Mode
Leased Line — Multiport Mode l The Leased Line configuration options only appear when the Sync Leased factory preset template is selected. They are used to configure the modem for operation over leased lines. Table 5-4 shows each Leased Line configuration option as it appears on the LCD, with the Sync Leased factory default setting (the default value if the modem is just being installed) shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 103 COMSPHERE 392xPlus Modems Leased Line Configuration Options — Multiport Mode l Autorate: Enable Nxt Enable Disable Fast GainHit Autorate. Once connected, the modem automatically lowers the line rate if line conditions become impaired. When line conditions improve, the modem automatically shifts up to the highest data rate the line can support. Autorate only occurs between 19,200 bps and 4800 bps during V.32, V.32bis, and V.32terbo connections and 33.6 and 2400 bps for the V.34 family.
Page 104 Leased Line Configuration Options — Multiport Mode l 2 Sec LSD Hold: Disable Nxt Disable Enable This configuration option only appears when V.34 is enabled. Two-Second LSD Hold. Holds the Line Signal Detect (LSD) for a maximum of two seconds. During this time, the carrier can drop completely and be reacquired by the receiver without retraining.
Page 105 COMSPHERE 392xPlus Modems Leased Line Configuration Options — Multiport Mode l AutoDialStandby: Disable Nxt Disable 15min 1hr 4hr Test(2min) Adv 15min Adv 30min Adv 1 hr TestAdv2min Automatic Dial Standby. Permits a modem operating on dial lines (regardless of the method of dialing origination) to check the quality of the leased lines periodically and, if they are good, to disconnect from the dial lines and resume operations on the leased lines.
Page 106 Leased Line Configuration Options — Multiport Mode l TMp TxPre-Value: 5 Nxt 0 1 2 3 4 5 6 7 8 9 A B C D E F This configuration option only appears if Leased-Line Rate is configured for TMp. Trellis Multipoint (TMp) Transmit Preemphasis Value.
Page 107: Test Configuration Options — Multiport Mode
COMSPHERE 392xPlus Modems Test — Multiport l The Test configuration option determines the duration of a test. Table 5-5 shows the Test configuration option as it appears on the LCD, with the Sync Leased factory default setting (the default value if the modem is just being installed) shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 108: Miscellaneous Configuration Options — Multiport Mode
Misc — Multiport l The Miscellaneous configuration options determine specifics for various functions, including network management parameters and remote modem access. Table 5-6 shows each Misc (Miscellaneous) configuration option as it appears on the LCD, with the Sync Leased factory default setting (the default value if the modem is just being installed) shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 109 COMSPHERE 392xPlus Modems Miscellaneous Configuration Options — Multiport Mode l Dir#1_Callback: Disable Nxt Disable Enable Directory Location 1 Callback. This configuration option controls whether or not the modem’s single number callback function is used. Disable – Modem does not use the single number callback function. Enable –...
Page 110 NOTE: Changes to this configuration option will cause the modem to reset. NOTE: This configuration option is only applicable for leased-line network management applications. For the Model 3920Plus, Tributary is the factory default. For the Model 3921Plus, Control is the factory default.
Page 111 COMSPHERE 392xPlus Modems Miscellaneous Configuration Options — Multiport Mode l Diag Connection: Modem(DC) Nxt Modem(DC) NMS(CC) Disable This configuration option does not appear when the LeaseLine Rate is configured for TMp, and NetworkPosition is configured for Tributary. NOTE: TMp tributaries cannot be diagnostically extended, therefore the Diag Connection configuration option is forced to Disable.
Page 112: Singleport Mode
Singleport Mode A In Singleport mode, the modem’s configuration options are arranged into nine groups based on functionality: • DTE Interface • DTE Dialer • Line Dialer • Dial Line • Leased Line • V.42/MNP/Buffer • Test (Table 5-13) • Misc (Table 5-14) •...
Page 113: Singleport Mode
COMSPHERE 392xPlus Modems Interface Dialer AutoAnswerRing# Dialer Type Port 1 DialTone Detect MUX Mode Async/Sync Mode Blind Dial Paus Sync DTE Rate BusyTone Detect Async DTE Rate "," Pause Time Asyn #Data Bits NoAnswer Timout Asyn Parity Bit Fast Disconnect Asyn #Stop Bits Line Crnt Disc DTR Action...
Page 114: Dte Interface - Singleport Mode
DTE Interface — Singleport Mode The DTE Interface configuration options contain EIA-232-D (ITU-T V.24) and asynchronous character format information essential for maintaining a connection and for transmitting data between the DTE and the modem. Table 5-7 shows each DTE Interface configuration option as it appears on the LCD, with the Sync Leased factory default setting (the default value if the modem is just being installed) shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 115 COMSPHERE 392xPlus Modems DTE Interface Configuration Options — Singleport Mode A Async DTE Rate: 19200 Nxt 19200 115200 76800 57600 38400 28800 14400 12000 9600 7200 4800 2400 1200 0–300 This configuration option only appears when Async/Sync Mode is configured for Async. Asynchronous DTE Data Rate.
Page 116 DTE Interface Configuration Options — Singleport Mode A Asyn #Stop Bits: 1 Nxt 1 2 This configuration option only appears when Async/Sync Mode is configured for Async. Asynchronous Number of Stop Bits. Selects 1 or 2 bits to signal the end of an asynchronous character. NOTE: If the DTE Dialer Type configuration option is set to AT or V.25bis Async, then the total character size must equal 10 bits.
Page 117 COMSPHERE 392xPlus Modems DTE Interface Configuration Options — Singleport Mode A DSR Control: Stndrd_RS232 (Cont.) Delay to Data – Operation is similar to the Standard RS232 except that DSR does not turn ON until the modem enters Data mode. Normally, the modem raises DSR when it begins the handshaking process. Use this setting when the DTE cannot operate with a long DSR-to-CTS delay (common for V.32bis modulation) or when dial access security is enabled and requires a DTE-side password entry.
Page 118 DTE Interface Configuration Options — Singleport Mode A CTS Control: Stndrd_RS232 Nxt Stndrd_RS232 Forced_On WinkWhenDisc Follows_DTR Follows_RTS Clear-to-Send Control. CTS is a signal from the modem to the DTE indicating that it can accept data from the DTE. Standard RS232 – In Synchronous mode, forces the state of CTS to follow the state of RTS in normal EIA-232-D operation.
Page 119 COMSPHERE 392xPlus Modems DTE Interface Configuration Options — Singleport Mode A LSD Control: Stndrd_RS232 Nxt Stndrd_RS232 Forced_On WinkWhenDisc Follows_DTR Sim_Cntl_Car =DTR/DiscOFF Line Signal Detect Control. LSD is a signal indicating that the carrier signal is being received from the remote modem. It is normally turned OFF to the DTE when the power level of the received carrier signal drops below the carrier detect threshold.
Page 120 DTE Interface Configuration Options — Singleport Mode A Bakup_TXClk_Src: Internal Nxt Internal External RXC_Loop This configuration option only appears in customized installations in which the Dual_Leased_Ln is configured for Enable and Async/Sync Mode is Sync. Backup Transmit Clock Source. Selects the clock reference source when operating in the Dual Leased Line Mode. This is a special mode in which one leased line is used to back up another.
Page 121 COMSPHERE 392xPlus Modems DTE Interface Configuration Options — Singleport Mode A DTE_Rate=VF: Disable Nxt Disable Enable This configuration option does not appear when Async/Sync is configured for Sync. DTE Rate = VF. Forces the DTE’s data rate to be equal to the VF (telephone line) data rate. Disable –...
Page 122: Dte Dialer - Singleport Mode
DTE Dialer — Singleport Mode The DTE Dialer configuration options establish the DTE-to-modem protocol for call establishment and control. Table 5-8 shows each DTE Dialer configuration option as it appears on the LCD, with the Sync Leased factory default setting (the default value if the modem is just being installed) shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 123 COMSPHERE 392xPlus Modems DTE Dialer Configuration Options — Singleport Mode A AT Escape Char: 043 ASCI Nxt " 043 ASCI This configuration option only appears when DTE Dialer Type is configured for AT. AT Escape Character. The escape sequence (+++) allows you to move from Data mode to Command mode. Use the ATO command to return to Data mode.
Page 124 Configure Branch Table 5-8 (3 of 5) DTE Dialer Configuration Options — Singleport Mode A Linefeed Char: 010 Nxt " 010 ASCI This configuration option only appears when DTE Dialer Type is configured for AT. Line Feed Character. Sets the character used to perform a line feed in Command mode for responses from the modem. The AT command is S-Register S4 = n, where n is a value from 0 to 127.
Page 125 COMSPHERE 392xPlus Modems DTE Dialer Configuration Options — Singleport Mode A ResultCode Form: Words Nxt Words Numbers (1) Numbers (2) This configuration option only appears when DTE Dialer Type is configured for AT. Result Codes Format. Controls whether or not result codes appear as words or as numeric codes. Some DTEs do not recognize Result Codes as words;...
Page 126: Line Dialer - Singleport Mode
DTE Dialer Configuration Options — Singleport Mode A V25b NewLineChr: CR+LF End CR+LF CR LF This configuration option only appears when DTE Dialer is configured for V.25bis Async. V.25bis New Line Character. Sets the modem for the command line terminator used by the DTE in V.25bis Async mode. The modem responds to the DTE using the same line terminator.
Page 127 COMSPHERE 392xPlus Modems Line Dialer Configuration Options — Singleport Mode A DialTone Detect: Enable Nxt Enable Disable Dial Tone Detect. Sets the modem for dial tone detection (Enable) or blind dialing (Disable). Enable – Modem disconnects the call if a dial tone is not detected within 10 seconds and displays No Dial Tone on both the LCD and asynchronous DTE terminal.
Page 128 Configure Branch Table 5-9 (3 of 4) Line Dialer Configuration Options — Singleport Mode A Fast Disconnect: Disable Nxt Disable Enable Fast Disconnect. Allows the modem to disconnect immediately after receiving a disconnect command from a local DTE or its own diagnostic control panel. Disable –...
Page 129 COMSPHERE 392xPlus Modems Line Dialer Configuration Options — Singleport Mode A No Data Disc: Disable Nxt Disable 10min 30min 60min No Data Disconnect. Forces the modem to disconnect if no data is transmitted and received within a specified amount of time. Disable –...
Page 130: Dial Line - Singleport Mode
Dial Line — Singleport Mode The Dial Line configuration options are used to configure the modem for operation over dial lines. Table 5-10 shows each Dial Line configuration option as it appears on the LCD, with the Sync Leased factory default setting (the default value if the modem is just being installed) shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 131 COMSPHERE 392xPlus Modems Dial Line Configuration Options — Singleport Mode A Automode: Enable Nxt Enable Disable System 85 This configuration option only appears when Dial Line Rate is configured for V.32 or V.34 families data rate. Automode. The modem automatically adapts to the modulation scheme and line rate of the remote modem. However, the maximum data rate the modem uses is determined by the Dial Line Rate configuration option.
Page 132 Dial Line Configuration Options — Singleport Mode A V22b Guard Tone: Disable Nxt Disable 550Hz 1800Hz This configuration option only appears when Dial Line Rate is configured for V.22bis or V.22 data rate, or when Automode is configured for Enable. V.22bis Guard Tone.
Page 133 COMSPHERE 392xPlus Modems Dial Line Configuration Options — Singleport Mode A V.34 Precoder: Disable Nxt Disable Enable This configuration option only appears when V.34 is enabled. V.34 Precoder. Determines whether the V.34 Precoder is used when operating with V.34 family modulation on either dial or leased lines.
Page 134: Leased Line - Singleport Mode
Leased Line — Singleport Mode The Leased Line configuration options only appear when the Sync Leased factory preset template is selected. They are used to configure the modem for operation over leased lines. Table 5-11 shows each Leased Line configuration option as it appears on the LCD, with the Sync Leased factory default setting (the default value if the modem is just being installed) shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 135 COMSPHERE 392xPlus Modems Leased Line Configuration Options — Singleport Mode A LeasedLine Rate: 33600(V34) (Cont.) NOTE: The modem must be in DirectMode before the modulation scheme can be changed from V.32bis, V.34 family, or TMp to another leased-line modulation (V.33, V.29, or V.22bis). See Err Contrl Mode configuration option for more about DirectMode.
Page 136 Leased Line Configuration Options — Singleport Mode A Gain Hit Thresh: 010 ASCI Nxt " 010 ASCI This configuration option only appears when Autorate is set to GainHit. Gain Hit Threshold. Determines the rate of gain hits required to force the modem to shift to the next lowest line rate. The threshold is specified as a decimal number 0 through 127 inclusive, representing the maximum number of gain hits that will be tolerated in a 15-minute interval.
Page 137 COMSPHERE 392xPlus Modems Leased Line Configuration Options — Singleport Mode A 2W SQ Retrain: Disable Nxt Disable 1 2 3 4 5 This configuration option is available only if Leased Mode is 2WLL-Orig or 2WLL-Ans and affects only V.34, V.32bis, and V.32 modulations.
Page 138 Leased Line Configuration Options — Singleport Mode A AutoDialStandby: Disable Nxt Disable 15min 1hr 4hr Test(2min) Adv 15min Adv 30min Adv 1 hr TestAdv2min Automatic Dial Standby. Permits a modem operating on dial lines (regardless of the method of dialing origination) to check the quality of the leased lines periodically and, if they are good, to disconnect from the dial lines and resume operations on the leased lines.
Page 139 COMSPHERE 392xPlus Modems Leased Line Configuration Options — Singleport Mode A V29 TrainOnData: Disable Nxt Disable Enable This configuration option only appears when Leased-Line Rate is configured for V29. V.29 Train On Data. When enabled, the modem receiver can train based upon the incoming data or a training sequence from the distant modem.
Page 140 Leased Line Configuration Options — Singleport Mode A Dual_Leased_Ln: Disable End Disable Enable Dual Leased Line. Allows the 2-wire backup facility to function as a 2-wire leased line facility. When this configuration option is disabled, the backup facility is a 2-wire dial line. NOTE: Plug the leased line into the jack labeled DIAL on the rear panel of the modem (see Except for dialing, ring indication, and call progression functions, you control the backup function as if it were a normal dial backup.
Page 141: V.42/Mnp/Buffer - Singleport Mode
COMSPHERE 392xPlus Modems V.42/MNP/Buffer — Singleport Mode V.42/MNP/Buffer configuration options determine the type of error correction and flow control used by the modems and attached DTEs. Some choices within this group may not appear depending upon how previous configuration options have been selected. Table 5-12 shows each V.42/MNP/Buffer configuration option as it appears on the LCD, with the Async Dial factory default setting shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 142 Configure Branch Table 5-12 (2 of 8) V.42/MNP/Buffer Configuration Options — Singleport Mode A Err Contrl Mode: V.42/MNPorBfr (Cont.) The AT command for BufferMode is \N0. The AT command for DirectMode is \N1. The AT command for MNP or Disconnect is \N2. The AT command for MNP or Buffer is \N3.
Page 143 COMSPHERE 392xPlus Modems V.42/MNP/Buffer Configuration Options — Singleport Mode A EC Fallbck Char: 013 ASCI Nxt " 013 ASCI This configuration option only appears when Async/Sync Mode is configured for Async, and EC Negotiate Buffer is not configured for Disable. Error Control Fallback Character.
Page 144 Configure Branch Table 5-12 (4 of 8) V.42/MNP/Buffer Configuration Options — Singleport Mode A XON/XOFF Psthru: Disable Nxt Disable Enable This configuration option only appears when Async/Sync Mode is configured for Async, Error Control Mode is not configured for DirectMode, and Flow Control of Modem is configured for XON/XOFF. XON/XOFF Passthrough.
Page 145 COMSPHERE 392xPlus Modems V.42/MNP/Buffer Configuration Options — Singleport Mode A Send Break Cntl: Data_First End Data_First Break_First This configuration option only appears when Async/Sync Mode is configured for Async, and Error Control Mode is not configured for DirectMode. Send Break Control. Determines what is sent from the modem first, data or break if a break sequence is sent from the DTE.
Page 146 Configure Branch Table 5-12 (6 of 8) V.42/MNP/Buffer Configuration Options — Singleport Mode A SDC Idle Fill: Flag_Fill Nxt Flag_Fill Mark_Fill This configuration option only appears when the Async/Sync Mode configuration option is set is to Sync and Sync Comp Mode configuration option is not set to DirectMode. Synchronous Data Compression Idle Fill.
Page 147 COMSPHERE 392xPlus Modems V.42/MNP/Buffer Configuration Options — Singleport Mode A Sync Flow Cntrl: Tx_Clock Nxt Tx_Clock None CTS_SyncDTE This configuration option only appears when the Async/Sync Mode configuration option is set is to Sync and Sync Comp Mode configuration option is not set to DirectMode. Synchronous Flow Control.
Page 148: Test - Singleport Mode
V.42/MNP/Buffer Configuration Options — Singleport Mode A RdcdAsyncBufSiz: Disable End Disable Enable This configuration option only appears when Async/Sync Mode is configured for Async, and Error Control Mode is configured for BufferMode or V42/MNPorBfr. Reduced Asynchronous Buffer Size. When enabled, the modem’s buffer size is limited to a maximum of 20 characters. The AT command is S-Register S97 = n, where n is 0 for Disable and 1 for Enable.
Page 149 COMSPHERE 392xPlus Modems Test Configuration Options — Singleport Mode A Test Timeout: Disable Nxt Disable 30sec 60sec 240sec Test Timeout. Determines how long a test runs before aborting. Disable – Allows a test to run indefinitely. 30, 60, or 240 seconds – Allows the test to run for 30 seconds, 60 seconds, or 240 seconds. The AT command is S-Register S18 = n, where n is 0 for Disable and 1 to 255 seconds.
Page 150: Misc - Singleport Mode
Misc — Singleport Mode The Miscellaneous configuration options determine specifics for various functions, including network management parameters and remote modem access. Table 5-14 shows each Misc (Miscellaneous) configuration option as it appears on the LCD, with the Sync Leased factory default setting (the default value if the modem is just being installed) shown following the colon ( : ) on the first line and with all available selections listed on the second line.
Page 151 Disable – Does not allow access from a remote modem. NOTE: The remote modem must be a Model 3920Plus or Model 3921Plus modem. The AT command is S-Register S55 = n, where n is 0 for Enable and 1 for Disable.
Page 152 Configure Branch Table 5-14 (3 of 5) Miscellaneous Configuration Options — Singleport Mode A SpecialSecurity: Disable Nxt Disable RemAccsPswd CallbkDir# This configuration option only appears when the modem is in Dial Only mode or Lease Answer Mode, and Answer Security Mode is configured for No_Answ_Sec. Special Security.
Page 153 NOTE: Changes to this configuration option will cause the modem to reset. NOTE: This configuration option is only applicable for leased-line network management applications. For the Model 3920Plus, Tributary is the factory default. For the Model 3921Plus, Control is the factory default.
Page 154 Configure Branch Table 5-14 (5 of 5) Miscellaneous Configuration Options — Singleport Mode A Diag Connection: Modem(DC) Nxt Modem(DC) NMS(CC) Disable Diagnostic Connection. Allows the configuration of the serial diagnostic port of the modem to be either a diagnostic channel that is connected to another modem (DC), or a control channel that is connected to a network management device (CC).
Page 155: Security - Singleport Mode
COMSPHERE 392xPlus Modems Security — Singleport Mode The Security configuration options allow you to set the parameters that control how a dial access security password is entered. For security configuration options, refer to Chapter 12, Security. 5-78 October 1998 Dial Access 3920-A2-GH30-40...
Page 156 Poll List Branch Poll List Branch The Poll List function is not available in: • Multipoint tributary modems. • Modems with the Diag Connection configuration option disabled. • Modems using modulations that do not support the secondary channel. • Point-to-point control modems.* The Poll List (Plist) branch of the Top-Level menu allows you to identify downstream modems in order to support health and status polling and download broadcasting.
Page 157: Display
COMSPHERE 392xPlus Modems To access PList from the Top-Level menu, make the following selections: Press the Within a network link, a control modem can communicate with a tributary modem by using the tributary modem’s network management address for polling functions. Each TMp tributary modem must have a different network management address.
Page 158: Clear
If there are modems in the poll list when you select Display, yyyyyy Select Nxt to scroll through the entries in the Active or Skip poll lists. To exit this function and remain in the PList Display branch, press the return to the Top-Level menu, press the Clear The Clear function does not appear in Remote mode.
Page 159 COMSPHERE 392xPlus Modems Change allows you to add modems to the Active poll list (Active), delete modems from both Active and Skip poll lists (Delete), and move modems from the Active to the Skip poll list. To implement Change, select the appropriate function (Active, Delete, or Skip). (For Skip, you will need to press the The function field (yyyyyy) displays the function selected (Active, Delete, or Skip).
Page 160: Add
The Add function does not appear in Remote mode or on control modems. Add allows you to add the tributary modem to a control modem’s poll list. This function should be initiated from only one tributary modem at a time. To access Add from the Plist branch, make the following selections: Press the The message Command Complete appears on the LCD to indicate that the tributary modem...
Page 161 COMSPHERE 392xPlus Modems Press the If an error message (OtherTestActive or Unable To Acquir) appears on the second line of the LCD, move up one level in the menu tree to clear the message and return to the PList Acquire branch.
Page 162: Status
Control Branch Control Branch The Control branch of the Top-Level menu allows you to manage hardware and software functions, such as speaker volume, reset, busy out, and firmware download. Status Configure PList Data_Stream Speaker Reset 3920-A2-GH30-40 Control Branch ..........Speaker .
Page 163 COMSPHERE 392xPlus Modems To access Control from the Top-Level menu, make the following selections: Press the Speaker Speaker allows you to make temporary adjustments to the modem’s speaker volume. Upon a reset, speaker volume returns to its configured setting. For more information on speaker settings, refer to the Misc section in Chapter 5, Configure Branch.
Page 164 Reset Reset causes the modem to stop operation and perform a complete program restart. The modem begins the power-up test sequence that ends with the Top-Level menu displayed on the LCD. Configuration options stored in an Active (Saved) configuration area are copied to the Active (Operating) configuration area.
Page 165 COMSPHERE 392xPlus Modems Now go to the next screen (Data Stream). The port field (for example, Port1) displays the selected port. The available Data Stream action (Disable or Enable) appears on the second line of the LCD beside the port field. If the modem’s data transmitter is enabled, the word Disable appears to indicate that you may disable the data transmitter by selecting this action.
Page 166 To enable or disable the modem’s data transmitter function on all ports, press the appropriate function key, F1 (Enable) or F3 (Disable). When the message Command Complete appears, press the To change the data stream on all ports again, press the F1 key. To exit this function and remain in the Control branch, press the the Top-Level menu, press the EIA LEDs...
Page 167 COMSPHERE 392xPlus Modems The port field (xxxxx) displays the currently selected interface. Valid interface selections are Port1, Port2, Port3, Port4, and depending on the set value of the Diagnostic Connection configuration option, CC (NMS Control Channel), or DC (Diagnostic Channel). Refer to Diag Connection configuration option in the Misc section of Chapter 5, Configure Branch.
Page 168: Call_Setup
To remove the modem from Make Busy mode, press the RemoveMakeBusy appears. Press any function key to select RemoveMakeBusy. The message Command Complete appears on the LCD. To exit this function and remain in the Control branch, press the the Top-Level menu, press the Service Line/Disconnect Service Line The Service Line/Disconnect Service Line is only available in Models 3921-B1-001 and 3921-B1-011.
Page 169 COMSPHERE 392xPlus Modems Press F1 (Service_Line) to switch the modem from its normal dial line to the service line. The message Command Complete appears. Now, when the modem places a call, instead of using the dial, the call is placed on the service line. To disconnect the modem from the service line and resume normal operation, press the (returning to Control branch).
Page 170 Selecting Clone Remote Clone Remote operations are not supported unless both local and remote modems are 392xPlus modems. (The 3800 or 391x Series modems cannot be used in cloning operations with 392xPlus modems.) To access DwnLoadSoftware from the Control branch, make the following selections: Press the Download_Code.
Page 171 COMSPHERE 392xPlus Modems Clone Remote in Broadcast Configurations A tributary modem configured for extended diagnostics (Diagnostic Connection configuration option set to Modem(DC)) can perform two types of Remote Clone operations. It can clone the upstream, VF connected, control modem (SC_Clone) or it can clone all the 392xPlus modems attached to its downstream Diagnostic Channel (DC_Broadcast).
Page 172 Viewing DC Broadcast Clone Results From the Choose DLL Type screen, press the the results of the last DC_Broadcast clone operation. If the message Trib List Empty appears, this indicates that a multiple download was never initiated. The address field (xxx) displays the network management address of one of the remote modems. Pressing the F1 key allows you to select various remote modems to determine the download result for those modems (Pass or Fail).
Page 173 COMSPHERE 392xPlus Modems • For Multiple download configurations, ensure that: — the tributaries are responding properly to polls (this may take several minutes after the control modem powers up). Refer to Chapter 9, Branch, for more information. — the control modem’s active poll list contains all the network management addresses for the remote 392xPlus tributary modems that will receive the download (refer to Chapter 6, —...
Page 174 Cloning a Multiple TMp Remote Press the F3 key to select Multiple Clone Remote. After completing this action, proceed to the next section titled Operation. Viewing Multiple TMp Clone Results From the Choose DLL Type screen, press the to view the results of the last multiple TMp clone operation. If the message Trib List Empty appears, this indicates that a multiple download was never initiated.
Page 175 COMSPHERE 392xPlus Modems Implementing a Clone Remote Operation The modem begins a transfer of its own program to the remote modem. This process takes the communication link out-of-service for a period of time depending on the data rate of the link. If the Clone Remote process is started and then interrupted, the remote modem is left in a partially programmed state in which its functional capabilities are limited to those required to initiate and complete another...
Page 176 If unsuccessful, the modem remains in the Download Transfer mode. The LCD’s top line displays RemClone Failed and the bottom line displays one of the following messages: Incompat Modulat No Response Access Disabled Password Invalid No Circuit After successful establishment of a Remote Cloning Download session, the following screens appear.
Page 177 COMSPHERE 392xPlus Modems Automatic Firmware Download New releases may be available for the 392xPlus modem. The latest 392xPlus firmware is available at no charge from the Automatic Firmware Download Center. Refer to the Requirements and Equipment Return To download the firmware, your modem must be configured for dialing. Save your modem’s current configuration to the Customer 1 or Customer 2 memory area, and load the Async Dial factory template (refer to Chapter 5, changing configuration options).
Page 178 VF Thresholds Update The VF Thresholds Update function allows you to set the thresholds that determine the Health and Status alarm conditions for the VF parameters. Refer to thresholds and their valid ranges and default values. To access VF_Thresh_Update from the Control branch, make the following selections: Press the VF_Thresh_Update.
Page 179 COMSPHERE 392xPlus Modems Note that a warning ( if you enter an invalid VF threshold (out of range). You cannot save your edits until all thresholds are within their valid range. Refer to Table 7-1 Press the Select the F2 ( " ) key to change the number above the cursor ( 9 ) to 0. If you want to modify additional VF thresholds, select Nxt.
Page 180 If the edited VF thresholds are valid, the Save command stores them into nonvolatile memory. When the Save completes, the message Save Completed appears. If the edited VF threshold is invalid (out of range), the error message Thd Out of Range appears.
Page 181: Valid Ranges For Vf Thresholds
COMSPHERE 392xPlus Modems VF Thresholds Receive Signal Level High Receive Signal Level Low Signal to Noise Ratio Non-Linear Distortion Retrains (per 15 minutes) Signal Quality Near Echo Far Echo Frequency Offset Phase Jitter Phase Hits Impulse Hits Gain Hits Drop Outs 7-20 Table 7-1 Valid Ranges for VF Thresholds...
Page 182: Tlk/Data
Test Branch Test Branch The Test branch of the Top-Level menu allows you to initiate various modem tests. Use these tests if you are having data communication problems, such as periodic character loss, random errors, or constant format errors. By the process of elimination, you can usually isolate the fault in your system.
Page 183 COMSPHERE 392xPlus Modems What Test branch selections are available depends on your modem’s configuration. See the description of each test for more information. To access the Test branch from the Top-Level menu, make the following selections: Press the Abort Abort ends any test that is in progress and brings the modem back to the normal mode of operation.
Page 184 Self Self performs an internal self-test of the modem, which takes less than a minute to complete. The modem must be offline; otherwise, Invalid Command appears. When this test is run in Remote mode, it causes the Remote mode session to be lost. The Remote mode session will reestablish after the self-test completes (usually one or two minutes).
Page 185: Local Analog Loopback
COMSPHERE 392xPlus Modems Loc Analog Loop Loc Analog Loop performs a local analog loopback (ITU-T V.54 Loop 3), Figure 8-1, that verifies modem operation as well as the connection between the DTE and modem. The modem must be offline and in Synchronous or Asynchronous Direct mode to perform this test, otherwise Invalid Command appears.
Page 186: Remote Digital Loopback
The test delays 15 to 30 seconds to allow any outstanding network management messages to propagate before the VF channel is interrupted by the test. The message Started appears on the LCD, and the Test LED lights for the duration of the test. If OtherTestActive appears on the LCD, another test is in progress.
Page 187 COMSPHERE 392xPlus Modems To access Rem_Digital_Loop from the Test branch, make the following selections: Press the Select the appropriate port by pressing the corresponding function key. Press the scroll other ports into view. This screen does not appear in Singleport mode. The message Started appears on the LCD, and the Test LED lights.
Page 188: Local Digital Loopback
Loc Digital Loop Loc Digital Loop is issued by a local modem and forces it to loopback any data received from the remote modem (Figure 8-3). (This test operates the same as a ITU-T V.54 Loop 2 except it is issued at your modem.) This is useful if a remote modem is incapable of initiating a remote digital loopback from its location.
Page 189: Pattern Test And Local Analog Loopback Test
COMSPHERE 392xPlus Modems This screen does not appear in Singleport mode. The message Started appears on the LCD and the Test LED lights. The port field (for example, P1 for Port 1) displays the port that is currently selected. You may see P1, P2, P3, or P4. If OtherTestActive appears on the LCD, another test is in progress.
Page 190: Pattern Test And Digital Loopback Test
Figure 8-5. Pattern Test and Digital Loopback Test To access Pattern from the Test branch, make the following selections: Press the 3920-A2-GH30-40 Figure 8-6. End-to-End Pattern Test Test: < Pattern key until Pattern appears. Select Pattern to start this test. Pick Test Port >...
Page 191 COMSPHERE 392xPlus Modems Select the appropriate port by pressing the corresponding F key. Press the ports into view. The Pick Test Port screen does not appear in Singleport mode. The message Started appears on the LCD and the Test LED lights. The port field (for example, P1 for Port 1) displays the port that is currently selected.
Page 192 Sub-Network Health and Status Branch Sub-Network Health and Status Branch The Sub-Network Health and Status (SubHS) function is not available on multipoint tributary modems or with certain modulations (V.29, V.33, V.22bis, and V.27bis). The SubHS branch of the Top-Level menu allows you to display alarm conditions in downstream modems.
Page 193 COMSPHERE 392xPlus Modems Press the If there are no modems in the poll list, the message Poll List Empty! appears on the second line of the LCD. When you select SubHS, yyyyyy Select Nxt to scroll through the entries in the poll lists. To exit this function and return to the Top-Level menu, press the key until SubHS appears.
Page 194: Call Setup Branch
Call Setup Branch Call Setup Branch The Call Setup function is not available in TMp Control mode. For dial backup applications, the Call Setup branch of the Top-Level menu allows you to dial, disconnect, and answer telephone calls. For leased backup applications, the Call Setup branch allows you to switch between the primary leased line and the backup leased line.
Page 195: Dial
COMSPHERE 392xPlus Modems Status Configure PList Dial Disconnect To access the Call Setup branch from the Top-Level menu, make the following selections: Press the Dial For dial backup applications, Dial allows you to dial any telephone number stored in directory locations 1–24.
Page 196 Select Dial to display the first directory telephone number. To view other directory locations, select Nxt. Once the directory location you want appears on the LCD, press the F2 or F3 key to dial the number. The Call Setup status Off Hook appears during the connection process. If the connection is successful, the modem is online and one of the Normal Operation status messages (Table...
Page 197: Disconnect
COMSPHERE 392xPlus Modems Disconnect For dial backup applications, use this function when you want to disconnect an established call on a dial line. For leased backup applications, use this function to switch between the primary leased line and the backup leased line. To access Disconnect from the Call Setup branch, make the following selection: Select Disconnect.
Page 198: Answer
Answer For dial backup applications, Answer allows the modem to go off-hook, generate an answer tone, and begin the handshaking process with the calling modem. Use the Answer function when the Auto-Answer Ring Count configuration option is disabled. (Refer to the Line Dialer section in Chapter 5, Configure Branch.) For leased backup applications, Answer allows the modem to begin a “handshake”...
Page 199: Dial Standby/Return To Dial
COMSPHERE 392xPlus Modems Under normal backup conditions, when a problem occurs on the primary leased line, the modems establish a connection over the backup network. When this occurs, the Dial Standby function appears on the LCD. If you select Dial Standby, the modem switches back to the primary leased-line while still maintaining the backup connection.
Page 200: Change Directory
If the modem is operating in a Dial Backup mode, the Dial Standby function forces the modem to primary leased-lines and the LCD displays the status message Command Complete. Once the modem is in Dial Standby mode, Return_to_Dial appears on the LCD. Selecting this function forces the modem to backup networks and the LCD displays the status message Command Complete.
Page 201: Entering Telephone Numbers And Dial Command Modifiers Into Directory Locations
COMSPHERE 392xPlus Modems Entering Telephone Numbers and Dial Command Modifiers into Directory Locations The following example uses an empty directory location for describing how to enter a telephone number. If you want to change an existing telephone number in any of the 24 directory locations, follow the same procedures.
Page 202: Valid Dial Command Modifiers
Dial command modifiers are parameters entered in the dial command string which specify how, when, and what number to dial. The following is a list of parameters the 392xPlus modems recognize: — Tone (DTMF) dial. Any digit 0–9, *, or # can be dialed as tone. —...
Page 203: Directory Status (May Not Appear For Certain Countries)
COMSPHERE 392xPlus Modems Directory Status (may not appear for certain countries) Directory Status displays the status of each directory location. To access Directory Status from the Call Setup branch, make the following selections: Press the Directory_Status. Press the Directory_Status. Select Nxt to display other directory locations. The status of a directory location can be: No Number Allowed...
Page 204 Talk/Data Branch Talk/Data Branch The Talk/Data function is not available in TMp Control mode. The Talk/Data branch of the Top-Level menu allows you to switch the modem between Talk mode and Data mode when manually dialing using either the DCP or an externally attached telephone.
Page 205 COMSPHERE 392xPlus Modems Manual Dialing When the Remote Modem is Configured for Auto-Answer On the remote modem, the Line Current Disconnect configuration option (refer to the Line Dialer section in Chapter 5, Configure Branch) must be set to Disable. This configuration option does not appear on Models 3920-A1-401, 411 and 3921-B1-001, 011.
Page 206 Manual Dialing When the Remote Modem is Configured for Manual Answer On both modems, the Line Current Disconnect configuration option (refer to the Line Dialer section in Chapter 5, Configure Branch) must be set to Disable. If you are originating a call using a telephone and the remote modem is configured for Manual Answer, perform the following procedure.
Page 207 COMSPHERE 392xPlus Modems 11-4 October 1998 3920-A2-GH30-40...
Page 208: Overview
To take advantage of this security feature, you must create a database of passwords which are stored in the modem’s nonvolatile memory. The Model 3920Plus modem stores a maximum of 20 passwords while the Model 3921Plus modem stores up to 3000 passwords. Control of security functions is established in the Security Configuration Options group which is located in the Configuration branch of the Top-Level menu.
Page 209: Originate Access Security
COMSPHERE 392xPlus Modems The COMSPHERE 392xPlus modems use an outbound and inbound method of security known respectively as Originate Access and Answer Access security. Both methods of security require some type of password entry whether it be included as part of an AT command dial string or entered directly from a remote user’s DTE.
Page 210: Vf-Side Passwords
VF-Side Passwords VF-side password entry occurs between modems prior to connecting. Once the VF-side password is entered, no other user intervention is required since security negotiation is handled solely by the modems. When the answering modem is configured for VF entry technique, it goes off-hook and transmits to the originating modem either a secondary dial tone or silence (this choice depends on how the VF Prompt Type option is configured).
Page 211: Dte-Side Passwords
COMSPHERE 392xPlus Modems DTE-Side Passwords DTE-side password entry requires the originating user to supply a valid password via the DTE. This method of password entry occurs after the modems’ training sequence, but before normal connection. The modems must be configured for asynchronous operation to use this type of security.
Page 212: Security Branch
Security Branch The Security branch of the Top-Level menu allows you to change and save parameters that are critical to the dial access security password database. This database is a collection of passwords and their associated parameters that determine how the modems control password access. Most of the functions within this branch are protected by an Administrative Password.
Page 213: Set Access Ctrl
COMSPHERE 392xPlus Modems Set Access Ctrl Set Access Control allows you to configure critical parameters contained within the security database table that control dial access security. These parameters are protected by an Administrative Password, which is an 8-digit decimal number. Set Access Control contains the Edit Password Table, Set Answer Security, Set Originate Security, and Set Administrative Password security configuration groups.
Page 214: Editpasswdtable
Select Index allows a specific record to be retrieved. Index addresses range from 0001 to 0020 for the Model 3920Plus and from 0001 to 3000 for the Model 3921Plus. The contents of this record can be viewed, edited, and saved.
Page 215 COMSPHERE 392xPlus Modems Select Index appears. Press the F2 ( " ) key to increment index values. Press the Continue this sequence until the desired index appears, and then press the F1 key to select Ent. If an index outside of the range is entered, the message Index Too Big appears. Choose an index from the database’s current index range.
Page 216: Edit Password Table Group Options
Table 12-1 describes the settings of the Edit Table Password group options. PsWdType xxxx Nxt Cleared DTE_Entry VF_Entry VF_plus_DTE Password Type. Indicates whether this index location is configured for VF-side password, DTE-side password, or both. Cleared displays for an index location that contains no valid entry. Note that this configuration option only identifies the type of password used.
Page 217: Set Answer Security Group Options
COMSPHERE 392xPlus Modems Set Answer Sec Set Answer Security determines if dial access security is enabled or disabled. This method of inbound security is configured in the answering modem. Although this also appears under the Security Configuration Option group, it can only be changed from the Set Answer Sec LCD display in the Security branch.
Page 218: Set Originate Security Group Options
Set Orig Sec Set Originate Security controls whether or not the modem can originate a call using AT commands when the dial access security feature is installed. This method of outbound security only applies to modems originating a call. To access Set_Orig_Sec from Set Access Ctrl, make the following selections: Press the Select Set_Orig_Sec.
Page 219: Set Admin Pswd
COMSPHERE 392xPlus Modems Set Admin PsWd Set Administrative Password is used to change the Administrative Password value. The Administrative Password is an 8-digit decimal number that allows authorized users to enter the Access Security Control function. If this value is forgotten, then the only way to access any of the security functions is by selecting Reset Security.
Page 220: Reset Security
Reset Security Reset Security is the second major function within the Security branch of the Top-Level menu. It erases all contents of the security database table and resets all index locations to Cleared. Two selections appear under Reset Security: Abort Security Reset and Erase All PassWords. Use Reset Security if you want to redo the entire security database table.
Page 221: Security Configuration Options
COMSPHERE 392xPlus Modems This concludes the description of the functions found in the Security branch of the Top-Level menu tree. The following section describes the security configuration options found within the Configure branch of the Top-Level menu tree. Security Configuration Options The Security Configuration Options group allows you to view and set dial access security parameters.
Page 222 DTE_PW_TermChar: 013 Nxt " 013 This configuration option does not appear if Answer Security Mode is configured for No_Answ_Sec. DTE Password Termination Character. Allows you to change the ASCII character used to indicate the end of a password or User ID entered by an originating user. This character can be set to any ASCII value except those representing alphanumeric characters (A–Z, a–z, and 0–9).
Page 223: Security Password Entry Techniques
COMSPHERE 392xPlus Modems Originate_Secur: No_OrigSec End No_OrigSec Ena_Orig_Sec Originate Security Mode. This configuration option is read-only and cannot be changed from the Configuration branch. The setting of this configuration option can only be changed in the Set Orig Sec group found in the Security branch. No Originate Security –...
Page 224: Originate Access Password
While pulse dial can be used to originate the call, DTMF tones must be used for the password. This can be accomplished by using the P and T modifiers appropriately. Refer to the Dial command in Chapter 14, modifiers. A DTE-side password is entered after the modems have trained, but before a normal connection is established.
Page 225: Database Table Examples
COMSPHERE 392xPlus Modems Database Table Examples The following examples illustrate possible database tables in which the password type is configured for VF Entry, DTE Entry or a combination of VF, DTE, and VF plus DTE Entry. These tables are shown for illustrative purposes only. Passwords shown are not representative of good password selections.
Page 226: Security Database Table Using Both Vf-Side And Dte-Side Passwords
Table 12-7 is an example of a security database table that uses a mixture of VF and DTE passwords. Security Database Table Using Both VF-Side and DTE-Side Passwords Index Password 1212 953246 46958373 32562682 1131 winter 1141 summer 1142 spring 1151 fall 1152...
Page 227 COMSPHERE 392xPlus Modems This page intentionally left blank. 12-20 October 1998 3920-A2-GH30-40...
Page 228 This page is self-supporting and can be removed for security reasons. The following provides instructions to clear the dial access security alarm light from the modem’s front panel: Press the Press F1 to access the Status branch. Press F1 again to access the DevHs branch. Press F3 to access the Security branch.
Page 229 COMSPHERE 392xPlus Modems 12-22 October 1998 3920-A2-GH30-40...
Page 230 Remote Branch Remote Branch The Remote branch of the Top-Level menu allows you to control the remote modem’s DCP using the local modem’s DCP. This function allows you to change configuration options and control test functions in a remote modem. Any changes made to configuration options while using the Remote branch are not saved until you exit the Remote branch.
Page 231 COMSPHERE 392xPlus Modems The following conditions must be met before using the Remote branch: • A connection using either leased lines or the dial network must be established. • The Access from the Remote configuration option must be enabled in the remote modem. •...
Page 232 For Trellis Multipoint (TMp) control modems, you must specify the network management address of a tributary modem. The following display does not appear in point-to-point or Trellis Multipoint tributary modems. The address field (xxx) displays the network management address of the modem to be accessed by the Remote function.
Page 233 COMSPHERE 392xPlus Modems displays and press any function key. Primary channel operation is not available when initiating a Remote function from a TMp tributary modem. If the remote modem accepts the password and the entry is successful, the Top-Level menu of the remote modem appears on the local modem’s LCD.
Page 234: Command And Data Modes
AT Command Set and S-Registers Overview Command and Data Modes Command Guidelines AT Command List S-Register List Overview In Singleport mode, the AT command set provides an alternative method to the modem’s DCP for entering commands that control the operation and configuration of the 392xPlus modems. This chapter discusses guidelines necessary to operate AT commands as well as listing the modifiers for all AT commands supported by the 392xPlus modems.
Page 235: Escape Sequence And Escape Guard Time
COMSPHERE 392xPlus Modems Escape Sequence and Escape Guard Time The escape sequence is only issued when the modem is online and in Data mode. The 392xPlus modems use three consecutive plus ( + ) characters as the escape sequence. (To change this value, refer to S-Register S2 discussed later in To prevent the modem from interpreting an embedded + + + in data as an escape sequence, the Escape Guard Time value determines the length of the pause before and after the escape sequence...
Page 236: Result Codes
Result Codes Table 14-1 lists all valid result codes for the 392xPlus modems. Numbers Numbers CONNECT RING NO CARRIER ERROR CONNECT 1200* NO DIALTONE* BUSY* NO ANSWER* CONNECT 2400* CONNECT 4800* CONNECT 9600* CONNECT 12000* CONNECT 14400* CONNECT 19200* CONNECT 7200* CONNECT 16800* CONNECT 300* CONNECT 2400/ EC**...
Page 237 COMSPHERE 392xPlus Modems Numbers Numbers CONNECT 9600/ EC** CONNECT 12000/ EC** CONNECT 14400/ EC** CONNECT 16800/ EC** CONNECT 7200/ EC** CONNECT 1200/ EC*** CONNECT 38400**** CONNECT 19200/ EC** CONNECT 57600**** CONNECT 57600/ EC*** CONNECT 76800**** CONNECT 76800/ EC**** CONNECT 115200**** CONNECT 115200/ EC*** CONNECT 21600* CONNECT 24000*...
Page 238: At Command List
Numbers Numbers CONNECT 33600* CONNECT 21600/ EC** CONNECT 24000/ EC** CONNECT 26400/ EC** CONNECT 28800/ EC** CONNECT 31200/ EC** CONNECT 33600/ EC** FORBIDDEN ⊗ DELAYED ⊗ * Only appears when the Extended Result Codes configuration option is enabled. ** Only appears when the modulation is V.34 and the Extended Result Codes configuration option is set to Add/EC or Add/V.42.
Page 239: Xplus At Commands
COMSPHERE 392xPlus Modems Command Repeat Last Command. Reexecutes last command string. (Not to be preceded with AT or followed by pressing the Return key.) Answer Mode. Goes off-hook and attempts to establish a connection without waiting for a ring. Dial. Begins the dialing sequence. The dial string n (modifiers and telephone number) is entered after the D command.
Page 240 Command DS=n Dial Stored Number. Dials the number stored in Location n (1–24). (To store a telephone number, refer to the &Zn=x command.) Command Character Echo. Disables echo to the DTE. Enables echo to the DTE. Hook Switch Control. Modem goes on-hook. Modem goes off-hook.
Page 241 COMSPHERE 392xPlus Modems Command Extended Result Code, Dial Tone Detect, and Busy Tone Detect Configuration Options. Extended Result Code: Enable Disable Add/EC Add/V42,MNP Use DTE Rate Dial Tone Detect: Enable Disable NOTE: It may not be possible to disable Dial Tone Detect in some countries. Busy Tone Detect: Enable Disable...
Page 242 Command &Cn LSD Control. &C0 Forced On. LSD ON at all times. &C1 Standard RS232. LSD is ON when the remote modem’s carrier signal is detected. LSD is OFF when carrier signal is not detected. &C2 Wink When Disconnect. LSD normally forced ON, turns OFF for approximately one second upon disconnecting.
Page 243 COMSPHERE 392xPlus Modems Command &Gn V.22bis Guard Tone. &G0 Disable. &G1 550 Hz. &G2 1800 Hz. NOTE: The V.22bis Guard Tone cannot be disabled in some countries. &In Dial Transmit Level. The AT command is &In, where n is: 0 for – 0 dBm 1 for –1 dBm •...
Page 244 Command &Mn and Async/Sync Mode and DTE Dialer Type. &Qn &M0, &Q0 Modem operates in Asynchronous mode using AT Command protocol. &M1, &Q1 Modem operates in Synchronous mode using AT Command protocol. &M2, &Q2 Modem operates in Synchronous mode and dials telephone number stored in directory location 1 when DTR signal turns OFF and then &M3, &Q3 Modem operates in Synchronous mode using AT Command...
Page 245 COMSPHERE 392xPlus Modems Command &Tn Tests. &T0 Abort. Stops any test in progress. &T1 Local Analog Loop. &T2 Pattern. Transmits and receives a 511 Bit Error Rate Test (BERT). &T3 Local Digital Loopback test. &T4 Enables Receive Remote Loopback Response configuration option. &T5 Disables Receive Remote Loopback Response configuration option.
Page 246 Command &Zn=x Store Telephone Numbers. Modem saves the telephone numbers and dial command modifiers (if any) entered for x (up to 40 characters in length) in Directory Location n (1–24). For example, the command AT&Z1 = 5551234 stores the telephone number 555-1234 into directory location 1. To clear a telephone number from a memory location, issue the &Zn =x command without entering a telephone number.
Page 247 COMSPHERE 392xPlus Modems Command Asynchronous Error Control Mode. Buffer Mode. Direct Mode. MNP or Disconnect. MNP or Buffer. V.42/MNP or Disconnect. V.42/MNP or Buffer. LAPM or Disconnect. LAPM or Buffer. Asynchronous Flow Control of DTE, Asynchronous Flow Control of Modem. No Data Disconnect Timer.
Page 248 Command Synchronous Flow Control of DTE. No flow control. Flow control using transmit clock (circuit 114). Flow control using CTS (circuit 106). #SCn Synchronous Data Compression Mode. #SC0 Disable Synchronous Data Compression mode. #SC1 Enable Synchronous Data Compression mode. 3920-A2-GH30-40 Table 14-2 (10 of 10) 392xPlus AT Commands...
Page 249: S-Register List
COMSPHERE 392xPlus Modems S-Register List S-Registers affect the operating parameters of the 392xPlus modems. S-Registers are only applicable when the DTE Dialer Type configuration option is set for AT. (Refer to the &Mn and &Qn commands.) Table 14-3 lists all S-Registers supported by the 392xPlus modems. The first column lists the S-Register.
Page 250: Xplus S-Registers
S-Register Auto-Answer Ring Number will count before automatically answering a call. Enter zero (0) if you do not want the modem to automatically answer any calls. Otherwise, enter a value from 1–255 for the number of rings to count before answering.
Page 251 COMSPHERE 392xPlus Modems S-Register Escape Guard Time. Register sets the value (in 20-millisecond increments) for the required pause before and after the escape sequence is issued. The guard time prevents the modem from interpreting data as the escape sequence characters. Enter a value from 0–255 in 20-millisecond increments.
Page 252 S-Register Proactive Retrain. Determines whether the modem automatically retrains if the Signal to Noise ratio drops 1.2 dB. Register has the following values: 0 = Enable 1 = Disable The factory setting is Enable. Rate Auto Orig. Register selects the maximum leased line rate at which the modem will run before a rate fallback causes an automatic dialup.
Page 253 COMSPHERE 392xPlus Modems S-Register Port4 Ext Alarm. Register determines whether Port 4 is used to pass user data or to monitor for external alarms. Register has the following values: 0 = Disable 1 = EnableLow 4 = EnableHigh The factory setting is Disable. Sync DTE Rate.
Page 254 S-Register Mixed Trib F/W. Mixed tributary firmware. Establishes that a multipoint network has modems using mixed firmware (prior to and after Release M02.00xx). Register has the following values: 0 = No 1 = Yes The factory setting is No. SDC Negotiation. Controls negotiation between two modems attempting to connect using SDC.
Page 255 COMSPHERE 392xPlus Modems S-Register Dial Line Rate. Register determines the modem’s data rate and modulation scheme for operation on dial lines. Register has the following values: 1 = 14,400 (V.32bis) 2 = 12,000(V.32bis) 3 = 9600 (V.32bis) 4 = 7200 (V.32bis) 5 = 4800 (V.32bis) 6 = 2400 (V.22bis) 7 = 1200 (V.22)
Page 256 S-Register Leased-Line Rate. Register determines the modem’s data rate and modulation scheme for operation on either 2-wire or 4-wire leased lines in either Answer or Originate mode. Register has the following values: 1 = 14,400 (V.32bis) 2 = 12,000 (V.32bis) 3 = 9600 (V.32) 4 = 7200 (V.32bis) 5 = 4800(V.32)
Page 257 COMSPHERE 392xPlus Modems S-Register Automatic Dial Backup. Register determines if the modem performs an automatic dial backup if the leased lines fail. Register has the following values: 0 = Disable 1 = Enable The factory setting is Disable. Automatic Dial Standby. Register determines if the modem performs an automatic dial standby if in Dial Backup mode.
Page 258 S-Register DTE LL (CT141). Register determines if the modem performs a local analog loopback if it receives a CT141 signal from the DTE. Register has the following values: 0 = Disable 1 = Enable 2 = Fast The factory setting is Disable. V.54 Address.
Page 259 COMSPHERE 392xPlus Modems S-Register CT111 Rate Control. Register determines if CT111 Rate is disabled, set for Fallback 1 or Fallback 2. CT111 Rate allows the DTE to control modem rate via Pin 23 of the EIA-232-D interface. This configuration option determines the effect of the DTE Rate Control signal.
Page 260 S-Register NMS Call Messages. Register determines if the modem sends information regarding status (Call Progress) and/or sends summarized call statistics (Call Connect) to the 6700 Series Network Management System (NMS). Register has the following values: 0 = Call Connect & Progress 1 = Disable 2 = Call Connect Only 3 = Call Progress Only...
Page 261 COMSPHERE 392xPlus Modems S-Register Network Position Identification. Register identifies each modem as either a control or tributary modem. Register has the following values: 0 = Tributary 1 = Control The factory setting is Tributary. Network Management Address. Register determines the modem’s network address.
Page 262 S-Register AT Command Mode. Register determines how the modem responds to valid and invalid AT commands. Register has the following values: 0 = Normal 1 = No ERROR 2 = No Strap or ERROR The factory setting is Normal. Fast Disconnect. Register allows the modem to disconnect immediately after receiving a disconnect command from a local DTE or its own diagnostic control panel.
Page 263 COMSPHERE 392xPlus Modems S-Register DTE Rate = VF. Register allows the DTE’s data rate to be equal to the VF (telephone line) data rate. If Enabled, the data rate between the DTE and modem is the same as the modem’s VF data rate. As a result, when the modem is in Data mode, the speed of the data passed between the modem and DTE occurs at the VF data rate.
Page 264 S-Register Trellis Multipoint (TMp) Tx Preemphasis. Provides amplification for frequencies above the carrier frequency to compensate for high frequency line attenuation. Register has the following values: 0 = Enable 1 = Disable The factory setting is Enable. Reduced Asynchronous Buffer Size. Register limits the modem’s buffer size to a maximum of 20 characters.
Page 265 COMSPHERE 392xPlus Modems 14-32 October 1998 3920-A2-GH30-40...
Page 266: Menu Tree
Menu Tree Overview ........... . Overview Pages A-2 and A-3 provide a menu tree for the 392xPlus modems.
Page 267 COMSPHERE 392xPlus Modems Port Select (Multiport mode) DeviceHS Identity V.34 Major Ser# Line = Pri 4W APL Minor Mod# Line = Pri 2W APL Status FRev Line = Bkup 2W APL Dial HPt# Line = Dial Backup DTE Rate Thresh FPt# Line = Dial ONLY Cmp Ratio...
Page 268 from previous page Control Test Self Abort Loc_Analog_Loop Speaker Data_Stream Make_Busy RemoveMakeBusy Reset EIA_LEDS 3920-A2-GH30-40 SubHS Call_Setup (Dial Backup only) Dial Answer Change_Directory Disconnect Dial_Standby Return_to_Dial Directory Locations 1 – 24 Rem_Digital_Loop Pattern Loc_Digital_Loop (3921Plus only) Download_Code (DownloadSoftware) EditPassWdTable Service_Line VF_Thresh_Update DiscServLine October 1998...
Page 269 COMSPHERE 392xPlus Modems October 1998 3920-A2-GH30-40...
Page 270: B-1 Modem Health
Overview Overview This appendix points out basic problems that can occur when operating a 392xPlus modem. Use Tables B-1 through difficulties, such as periodic character loss, random errors, or constant format errors, use the loopback tests described in Chapter 8, fault in your system by using the process of elimination.
Page 271: B-2 Leased-Line Operation
COMSPHERE 392xPlus Modems Symptom The modems do not train-up on leased lines. Symptom The dial backup line is present, but the modems cannot connect. The modem does not switch back to leased-line operation. Table B-2 Leased-Line Operation Action Verify that the correct cabling is used for your application. Refer to Chapter 2, Modem Installation.
Page 272: B-4 Modem — Dte Connection
Symptom The modem does not accept or echo back AT commands. 3920-A2-GH30-40 Table B-4 Modem — DTE Connection Action Verify that the cable between the Async port of the DTE and the modem is a standard RS-232 cable. (Null modem cables, also known as crossover cables, do not work in this application.) Verify that the Command Character Echo configuration option is enabled.
Page 273 COMSPHERE 392xPlus Modems Symptom The modem does not receive a dial tone. The modem does not go off-hook and answer an incoming call. The modem goes off-hook, answers, but does not connect. The Originate Mode does not function properly. The modem does not go off-hook and begin dialing.
Page 274: B-6 Online Operation
Symptom Intermittent disconnects, high error rates, or excessive retransmissions occur. The modem establishes and then disconnects the call. High error rates occur when running a local loopback or self-test. Symptom The data is scrambled. Data is missing during a transfer. Symptom Problems in collecting Health and Status information from tributary...
Page 275: B-8 Mux Operation
COMSPHERE 392xPlus Modems Symptom The MUX configuration option does not appear under DTE Interface. Table B-8 MUX Operation Action The Dial Access Security feature is enabled. Verify that both the Answer and Originate security options are disabled. Refer to sections Set Orig Sec in Chapter 12, Security.
Page 276 Overview EIA-232-D Pin Assignments VF Connector Pin Assignments Auxiliary Cables Not Supplied Overview This appendix lists EIA-232-D and VF TELCO pin assignments and provides information about auxiliary cables which are not supplied. 3920-A2-GH30-40 Pin Assignments ........... . .
Page 277 COMSPHERE 392xPlus Modems EIA-232-D Pin Assignments Table C-1 lists the EIA-232-D pin assignments for the modem. Name Circuit — +12V — –12V — — — CT112 — — — — — — CT141 CT140 CT111 XTXC TEST Table C-1 EIA-232-D Pin Assignments Signal ITU-T Source...
Page 278: C-2 Vf Connector Pin Assignments
VF Connector Pin Assignments Table C-2 lists the connector pin assignments for Model 3920Plus modular jacks as well as the pin assignments for the TELCO jacks. (See Figure C-1.) Leased 4-Wire: TX 2-Wire: TX/RX 4-Wire: TX 2-Wire: TX/RX 4-Wire: RX...
Page 279 COMSPHERE 392xPlus Modems Auxiliary Cables Not Supplied To add an external telephone to your modem, use an external “Y” cable to connect the phone line to both the modem and the telephone (Figure C-2). Figure C-2. Wiring Diagram — “Y” Cable for External Telephone October 1998 3920-A2-GH30-40...
Page 280 For 2-wire leased-line connections to a JM8 network interface, use an 8-position to 6-position crossover cable (Figure C-3) according to the following FCC requirements: “The RJ series of jacks should not be used for connecting data equipment to nonswitched private line networks — specifically, the service equivalents of the pre-divestiture Series 3002 (Category II, Tariff #260) service.
Page 281 COMSPHERE 392xPlus Modems To connect a Model 3920Plus port to another modem’s EIA-232-D interface, use a 25-pin crossover cable (Figure C-4). 25-POSITION PLUG PIN NO. CT140 XTXC CT142 (TEST) Figure C-4. Wiring Diagram — 25-Pin Crossover Cable 25-POSITION PLUG PIN NO.
Page 282 ITU-T V.25bis Dialing Command Overview Call Request Commands Call Response Call Answer Commands Program Normal (PRN) Request List of Delayed Numbers (RLD) Request List of Forbidden Numbers (RLF) Request List of Stored Numbers (RLN) List Delayed Numbers Response (LSD) List Forbidden Numbers Response (LSF List Stored Number Response (LSN) Command Response Overview...
Page 283: Call Request Commands
COMSPHERE 392xPlus Modems Call Request Commands Call Request commands are issued from the DTE to the modem and are responsible for initiating dial calls. Call Request commands include Call Request with Number Provided (CRN) and Call Request with Stored Memory Address Provided (CRS). Call Request with Number Provided (CRN) The CRN command dials the telephone number entered from the DTE.
Page 284: Call Connecting (Cnx
NS is similar to the Common Operational Message Invalid Number and the result code ERROR. CB is similar to the Call Failure Messages Dial Line in Use and No Dial-Test and the result code ERROR. RT is similar to the Call Failure Message No Answer Tone and the result code NO CARRIER. AB is similar to the Call Failure Messages No Dial Tone and No Dial-DTR and the result code NO DIALTONE and ERROR.
Page 285: Connect Incoming Call (Cic
COMSPHERE 392xPlus Modems Connect Incoming Call (CIC) The CIC command forces the modem to cancel any DIC commands and answer an incoming call. This command is only valid when the DTE issues a DIC command. CIC must be issued within 10 seconds after sending a DIC.
Page 286: Request List Of Stored Numbers (Rln
Request List of Stored Numbers (RLN) The Request List of Stored Numbers (RLN) command displays telephone numbers stored in the modem’s directory location. If the RLN command is entered without specifying a directory location, then all directory locations and telephone numbers appear. If a directory location is entered, then only that telephone number appears.
Page 287: Command Response
COMSPHERE 392xPlus Modems Command Response A Command Response indicates that the command entered was a valid or invalid entry. Command Response includes Valid (VAL) and Invalid (INV). Valid (VAL) The VAL response indicates that the modem has accepted the V.25bis command issued by the DTE.
Page 288 V.25bis Command Request to List Delayed Numbers Request to List Forbidden Numbers Request to List Stored Numbers List Delayed Numbers List Forbidden Numbers List Stored Numbers Table D-2 lists V.25bis response messages supported by the 392xPlus modems. V.25bis Command Call Failure Indication Call Connecting Indication List Stored Number Valid Command...
Page 289 COMSPHERE 392xPlus Modems October 1998 3920-A2-GH30-40...
Page 290: E-1 Ascii Characters
Overview Overview Table E-1 in this appendix provides the ASCII character table. Hexadecimal ASCII Value 3920-A2-GH30-40 ASCII Character Table ........... . Table E-1 (1 of 4) ASCII Characters...
Page 291 COMSPHERE 392xPlus Modems Hexadecimal ASCII Value Table E-1 (2 of 4) ASCII Characters Decimal Control ASCII Value Character October 1998 CTRL-W CTRL-X CTRL-Y CTRL-Z CTRL-[ CTRL-/ CTRL-] CTRL-|Ax CTRL-_ spacebar “ & ’ < 3920-A2-GH30-40...
Page 292 Hexadecimal ASCII Value 3920-A2-GH30-40 Table E-1 (3 of 4) ASCII Characters Decimal Control ASCII Value Character October 1998 ASCII Character Table > ‘...
Page 293 COMSPHERE 392xPlus Modems Hexadecimal ASCII Value Table E-1 (4 of 4) ASCII Characters Decimal Control ASCII Value Character October 1998 delete 3920-A2-GH30-40...
Page 294 Default Configuration Options Overview Overview Table F-1 lists the six sets of default (preset) configuration options, labeled Sync Leased, Async Leased, TMp (Trellis Multipoint), Async Dial, Sync Dial, and UNIX Dial. These six sets contain the most commonly used configuration options for modems installed into these hardware environments.
Page 295 COMSPHERE 392xPlus Modems Sync Leased Configuration Default Option Settings DTE Interface (Multiport mode) Sub-group MUX Mode TDM/MSD TDM/MSD Tx Clock Source Internal Internal Port4 Ext Alarm Disable Disable Backup Tx Clock Internal Internal Source F CT111 Rate Disable Disable Control F MSD Port Host Host...
Page 296 Sync Leased Configuration Default Option Settings Port Rate Sub-group (Cont’d) Rate at 14.4 K 14400 Port1 or 14400 Port1 or Disable (Ports 2, Disable (Ports 2, 3, 4) 3, 4) Rate at 12.0 K 12000 Port1 or 12000 Port1 or Disable (Ports 2, Disable (Ports 2, 3, 4)
Page 297 COMSPHERE 392xPlus Modems Sync Leased Configuration Default Option Settings Port EIA Sub-group (Cont’d) CTS Control Standard RS232 Standard RS232 RTS/CTS Delay LSD Control Standard RS232 Standard RS232 XTXC Clamps Enable Enable TXC F CT111 Control F Disable Disable Rcv Remote Loop Enable Enable DTE RL (CT140)
Page 298 Sync Leased Configuration Default Option Settings DTE Interface (Singleport mode Cont’d) CTS Control Standard RS232 Forced On RTS/CTS Delay LSD Control Standard RS232 Standard RS232 Tx Clock Source Internal Internal † Backup Tx Clock Internal Internal † Source F XTXC Clamps Enable Enable TXC F...
Page 299 COMSPHERE 392xPlus Modems Sync Leased Configuration Default Option Settings DTE Dialer l (Cont’d) Enable F Enable F Result Codes Enable F Enable F Extended Result Codes Words F Words F Result Codes Format Normal F Normal F AT Command Mode V.25bis Coding F ASCII ASCII...
Page 300 Sync Leased Configuration Default Option Settings Dial Line Dial Modulation V.34 V.34 Dial Line Rate 33600 (V34) 33600 (V34) Automode F l Enable Enable Autorate Enable Enable V32bis Override F Disable Disable Dial Tx Level Permissive Permissive (–9 dBm) (–9 dBm) V.22bis Guard Disable Disable...
Page 301 COMSPHERE 392xPlus Modems Sync Leased Configuration Default Option Settings Lease Line (Cont’d) Rate Auto Orig Disable Disable Auto Dial Standby Disable Disable Special Standby F Disable Disable Dial Standby Time 10 min 10 min Carrier On Level – 43 dBm –...
Page 302 Sync Leased Configuration Default Option Settings V.42 / MNP / Buffer l Err Contrl Mode †† DirectMode Direct Mode Sync Comp Mode † DirectMode DirectMode V.42bis Enable Enable Compression †† F MNP5 Enable Enable Compression †† F EC Negotiate Disable Disable Buffer ††...
Page 303 COMSPHERE 392xPlus Modems Sync Leased Configuration Default Option Settings V.42 / MNP / Buffer (Cont’d) l SDC Delay Min † Sync Flow Cntrl † Tx_Clock Tx_Clock Test DTE RL Disable Disable (CT140) l F DTE LL Disable Disable (CT141) l Test Timeout Disable Disable...
Page 304 Sync Leased Configuration Default Option Settings Misc (Cont’d) Network Management Address J Diagnostic (Modem (Modem Connection (DC) – 3920) or (DC) – 3920) or (NMS(CC) – (NMS(CC) – 3921) 3921) Mixed Trib F/W F Link Delay (Sec) Security l Entry Wait Time 20 sec 20 sec VF Prompt Type...
Page 305 COMSPHERE 392xPlus Modems F-12 October 1998 3920-A2-GH30-40...
Page 306 Sample Configurations Overview Point-to-Point Extended Point-to-Point Extended Multipoint Point-to-Point with Automatic Dial Backup Point-to-Point with Network Management Carrier with Network Management Extended Diagnostics Digital Bridging Point-to-Point MSD Multipoint MSD Overview This appendix provides diagrams of sample configurations for the 392xPlus modems. Following each diagram, the appropriate configuration options, cables, and sample line rates are listed.
Page 307: Point-To-Point
4800 4800 Cable 1 Cable 1 Cable 1 Cable 1 Figure G-1. Sample Configuration — Point-to-Point Configuration Options 3920Plus A 3920Plus B 28800(V34) Leased 3920Plus Cable 2 Cable 2 Use Sync Leased (Answer) default configuration options with the following exception:...
Page 308 Sample Port Rate Table Cables Cable 1 Cable 2 3920-A2-GH30-40 Port Port 1 Port 2 Port 3 Rate 28.8K 9600 9600 4800 24.0K 9600 Disable 4800 19.2K 9600 Disable 4800 16.8K 9600 Disable Disable 14.4K 9600 Disable Disable 12.0K Disable Disable Disable 9.6K...
Page 309 9600 3920Plus (Sync) 4800 4800 Cable 1 Cable 1 Cable 1 Cable 1 Figure G-2. Sample Configuration — Extended Point-to-Point Configuration Options 3920Plus A 3920Plus B 28800(V34) Leased 3920Plus Cable 2 Cable 2 4800(V32b) Leased 3910 Cable 2 Use Sync Leased (Answer) default configuration options with the following...
Page 310 3910 A 3910 B Sample Port Rate Table Cables Cable 1 Cable 2 Cable 3 3920-A2-GH30-40 Use Sync Leased (Answer) default configuration options with the following exceptions: Tx Clock Source Set to External. LeasedLine Rate Set to 4800(V32b). Autorate (Leased Line) Set to Disable. Use Sync Leased (Originate) default configuration options with the following exceptions: Tx Clock Source...
Page 311 COMSPHERE 392xPlus Modems Extended Multipoint Figure G-3 shows a sample configuration for extended multipoint applications. 28800(V34) 9600 9600 3920Plus (Sync) 4800 4800 Cable 1 Cable 1 Cable 1 Cable 1 * This FEP Port is Running the Multipoint Application Figure G-3. Sample Configuration — Extended Multipoint...
Page 312: Configuration Options
Configuration Options 3920Plus A 3920Plus B 3910 A 3910 B 3910 C Sample Port Rate Table 3920-A2-GH30-40 Use Sync Leased (Answer) default configuration options with the following exception: Rate Refer to Use Sync Leased (Originate) default configuration options with the following...
Page 313: Cables
9600 (Sync) 9600 28800(V34) (Sync) 4800 3920Plus (Sync) 4800 (Sync) Cable 1 Figure G-4. Sample Configuration — Point-to-Point with Automatic Dial Backup Use a standard, customer-supplied, EIA-232-D/V.24 cable with a DB-25-P (plug) connector at one end to attach to the modem. Attach this to the connector labeled DTE1, 2, 3, or 4.
Page 314: Configuration Options
Configuration Options 3920Plus A 3920Plus B Sample Port Rate Table Cables Cable 1 Cable 2 Cable 4 3920-A2-GH30-40 Use Sync Leased (Answer) default configuration options with the following exceptions: Auto Dial Back Set to Enable. Rate Refer to Use Sync Leased (Originate) default configuration options with the following...
Page 315: Configuration Options
Cable 1 Cable 1 Cable 1 Cable 5 (6700 6800) Adapter (002-0025-0031) Figure G-5. Sample Configuration — Point-to-Point with Network Management Configuration Options 3920Plus A 3920Plus B G-10 28800(V34) Leased 3920Plus Cable 2 Cable 2 Hubbing Device Use Sync Leased (Answer) default configuration options with the following...
Page 316: Cables
Sample Port Rate Table Cables Cable 1 Cable 2 Cable 5 3920-A2-GH30-40 Port Port 1 Port 2 Port 3 Rate 28.8K 9600 9600 4800 24.0K 9600 Disable 4800 19.2K 9600 Disable 4800 16.8K 9600 Disable Disable 14.4K 9600 Disable Disable 12.0K Disable Disable...
Page 317 Cable 1 Cable 1 Cable 5 (6700 6800) Adapter (002-0025-0031) Figure G-6. Sample Configuration — Carrier with Network Management G-12 28800(V34) Leased 3920Plus Cable 2 Cable 2 Cable 1 Cable 1 Cable 1 Cable 1 October 1998 9600 (Sync) 9600...
Page 318: Cables
Configuration Options 3921Plus A 3920Plus B Sample Port Rate Table Cables Cable 1 Cable 2 Cable 5 3920-A2-GH30-40 Use Sync Leased (Answer) default configuration options with the following exceptions: Rate Refer to the Diag Connection Set to NMS(CC). NetMngmtAddress Set to 1.
Page 319: Extended Diagnostics
COMSPHERE 392xPlus Modems Extended Diagnostics Figure G-7 shows a sample configuration for extended diagnostics. Figure G-7. Sample Configuration  Extended Diagnostics Configuration Options 3920Plus A 3920Plus B G-14 Use Sync Leased (Answer) default configuration options with the following exceptions: NetworkPosition Set to Control.
Page 320: Cables
3920Plus C 3920Plus D, F 3910 H 3920Plus E 3910 G Cables Cable 1 Cable 2 Cable 3 Cable 6 Cable 7 Adapter 871A 3920-A2-GH30-40 Use Sync Leased (Answer) default configuration options with the following exceptions: Tx Clock Source Set to External.
Page 321: Digital Bridging
19200(TMp) Cntrl 3920Plus Cable 1 Backup 3920Plus Cable 3 Backup 3920Plus Backup 3910 Could be 3920Plus or 3910 Figure G-8. Sample Configuration  Digital Bridge 3920Plus A 3920Plus B, C 3910Plus D G-16 Cable 2 Cable 2 Cable 4 Dial...
Page 322 3920Plus E, G 3920Plus F Cables Cable 1 Cable 2 Cable 3 Cable 4 3920-A2-GH30-40 Use TMp Tributary template default configuration options with the following exceptions: Port2 MSD Set to Enable. RTS Action Set to Sim_Cntl_Car. Auto Dial Back Set to Enable.
Page 323 Point-to-Point MSD Figure G-9 shows a sample configuration for point-to-point MSD. Cable 1 19200 3920Plus 9600 (Sync) Cable 1 Figure G-9. Sample Configuration — Point-to-Point MSD 3920Plus A 3920Plus B Cables Cable 1 Cable 2 Cable 3 G-18 Logical Channel...
Page 324 Sample Port Rate Table: Point-to-Point MSD 3920Plus A Sample Port Rate Table: Point-to-Point MSD 3920Plus B 3920-A2-GH30-40 Port Port 1 Port 2 Port 3 Rate 28.8K 19200 Disable Disable 24.0K 14400 Disable Disable 19.2K 9600 Disable Disable 16.8K 4800 Disable Disable 14.4K...
Page 325 COMSPHERE 392xPlus Modems Multipoint MSD Figure G-10 shows a sample configuration for multipoint MSD. 19200 TMp 3920Plus Cable 1 Could be 3910 or 3920Plus Figure G-10. Sample Configuration — Multipoint MSD 3920Plus A 3920Plus B, C, D G-20 19200 TMp...
Page 326: Cables
Cables Cable 1 Cable 2 3920-A2-GH30-40 Use a standard, customer-supplied, EIA-232-D/V.24 cable with a DB-25-P (plug) connector at one end to attach to the modem. Attach this to the connector labeled DTE1, 2, 3, or 4. Use part number 125-0053-1431 (an 8-position, 8-wire modular cord that is supplied with the modem).
Page 327 COMSPHERE 392xPlus Modems G-22 October 1998 3920-A2-GH30-40...
Page 328 Synchronous Data Compression Overview Synchronous Data Format SDC Algorithm DTE and DCE Frames SDC User Interface Data Synchronization Flow Control Method Tuning SDC Efficiency SDC Negotiation Overview The Paradyne proprietary Synchronous Data Compression (SDC) feature allows an increase of throughput in data transmission, and has an error correcting procedure so that transmitted data is less sensitive to channel disturbances.
Page 329: Synchronous Data Format
COMSPHERE 392xPlus Modems INTERCHANGE CIRCUITS SYNCHRONOUS FUNCTION Figure H-2. Synchronous Data Compression Synchronous Data Format The SDC feature supports the HDLC and SDLC type protocols for synchronous DTE data. An HDLC frame is composed of an information field containing the data to transmit, plus an overhead (address, control, and FCS fields) used by the DTE protocol.
Page 330: Dte And Dce Frames
DTE and DCE Frames Data exchanged between the local and remote DCEs is according to the LAPM protocol. The structure of a LAPM frame (DCE frame) is identical to the HDLC frame. The data from the DTE is compressed into the information field of the DCE frame. After compression, one DTE frame is segmented into one or several DCE frames.
Page 331: Data Synchronization
COMSPHERE 392xPlus Modems Data Synchronization Data exchanged between the synchronous DTE and the modem is synchronized by two clock signals. Data coming from the DTE is synchronized by the transmit clock and data received by the DTE is synchronized by the receive clock. The transmit clock is provided by the modem on circuit 114 or by the synchronous DTE on circuit 113.
Page 332: Flow Control Method
Flow Control Method The data transmitted from the DTE is sent to the DCE at a rate determined by the transmit clock frequency. When SDC is active, this data is then compressed in the DCE and sent to the remote DCE at the line rate less than the the rate between the DTE and DCE (usually twice, three, or four times less).
Page 333: Tuning Sdc Efficiency
COMSPHERE 392xPlus Modems Tuning SDC Efficiency SDC efficiency is dependent on the configuration parameters of the DTE and the modem. DTE Configuration The way DTE parameters are changed, and whether they can be changed, depends on your DTE. See the documentation that came with your DTE. DTE rate configuration parameter.
Page 334: Sdc Negotiation
SDC Negotiation The use of the synchronous data compression function and the value of the associated parameters is negotiated at link establishment via a protocol. The three associated parameters have the same meaning as those used for asynchronous data compression: •...
Page 335 COMSPHERE 392xPlus Modems October 1998 3920-A2-GH30-40...
Page 336: Equipment List
Model 3920Plus Model 3921Plus 6-position, 4-wire modular cord, 7-foot length 8-position, 8-wire modular cord, 14-foot length Universal Power Supply (3920-A1-xxx) Unregulated 100-vac Power Supply (3920-A2-xxx) Unregulated 110-vac Power Supply (3920-A2-xxx) Unregulated 230-vac Power Supply (3920-A2-xxx) 3600 Hubbing Device EIA-323-D/V.24 Crossover Cable...
Page 337 COMSPHERE 392xPlus Modems October 1998 3920-A2-GH30-40...
Page 338 Active (Operating) A configuration area containing configuration options currently in use by the modem. Any time a power cycle occurs or a reset is performed or a save is issued using the DCP, this area is updated with the contents of Active (Saved). Active (Saved) A nonvolatile configuration area containing the most recently saved configuration options.
Page 339 COMSPHERE 392xPlus Modems automatic dial backup When leased-line operation fails, this function forces the modem to dial the telephone number stored in directory location 1. automatic dial standby When operating in Dial Backup mode, this function forces the modem to periodically check the quality of the leased line.
Page 340 character echo A way to check the accuracy of data transmission by sending to the monitor (displaying) all the characters being transmitted. circuit pack lock A screw lock tab installed over a circuit card’s latch release tab to prevent the unit from being removed without a tool.
Page 341 COMSPHERE 392xPlus Modems Data mode A state where any entries made from the DTE are considered data and are transmitted and received between modems. Modems remain in Data mode until the connection is broken or until they are forced into online Command mode using the escape sequence. DB-25 connector A 25-pin connector that is used to connect a cable which enables communication between two devices.
Page 342 directory location Nonvolatile memory that stores up to ten telephone numbers. Each directory location can have up to 40 characters entered. Canadian Department of Communication. download A process that transfers modem firmware from a locally attached PC to a modem or allows the cloning of firmware from a local modem to a remote modem.
Page 343 COMSPHERE 392xPlus Modems function key Any one of three keys on the DCP that allows you to select or increment an LCD entry. Function keys are labeled F1, F2, and F3. half-duplex Two-way data communications allowed in only one direction at a time. handshaking The exchange of predetermined codes and signals (tones) to establish a connection between two modems.
Page 344 This protocol (Microcom Networking Protocol) detects and corrects data errors caused by telephone line noise and signal distortion. MNP5 includes data compression. modem (Modulator/DEModulator). A device that transforms signals from digital to analog form and vice versa. modulation The process of varying some characteristics (usually amplitude, frequency, and/or phase) of a carrier wave to form data transmissions.
Page 345 COMSPHERE 392xPlus Modems phase jitter A rapid or repeated shifting of the relative phase of a signal resulting in unwanted distortion. physical address The diagnostic address of a control modem derived from its location in the carrier: its carrier and slot number. point-to-point line A line or circuit connecting two stations.
Page 346 Shared Diagnostic Unit. A circuit card that plugs into a dedicated slot in the COMSPHERE 3000 Series Carrier to provide the SDCP and network management interfaces to the modems in the carrier. It translates the network management protocol to the devices in the carrier and routes incoming messages to the appropriate slots. secondary channel A data transmission channel with a lower signaling rate than the primary channel.
Page 347 COMSPHERE 392xPlus Modems V.22 A ITU–T standard for modems operating full-duplex over dial networks at 1200 bps. V.22bis A ITU–T standard for modems operating full-duplex over leased lines or dial networks at 2400 bps. V.27bis A ITU–T standard for modems operating over leased lines at 2400 or 4800 bps. V.29 A ITU–T standard for modems operating over leased lines at 4800, 7200, or 9600 bps.
Page 348 Numbers 2W Leased Line SQ Retrain, 5-27, 5-60 S-Register, 14-28 Abort (test), 8-2 ac power requirements, 1-13 Access from Remote Multiport mode, 5-31 S-Register, 14-25 Singleport mode, 5-74 Active (Operating) configurations, 5-1 Active (Saved) configurations, 5-1 address, network management, 5-33, 5-76, 6-2 analog loopback test, 8-4–8-5 answer access security, 12-2–12-4 Answer Mode, 14-6...
Page 349 COMSPHERE 392xPlus Modems Bell 103J, 5-53 212A, 5-53 Bisync, 5-45, D-1 Blind Dial Pause Multiport mode, 5-20 S-Register, 14-17 Singleport mode, 5-50 Break Buffer Control, 5-67 AT command, 14-13 Break Forces Escape, 5-46 AT command, 14-13 Buffer Disconnect Delay, 5-70 S-Register, 14-24 buffer size, Reduced Asynchronous, 5-71 busy...
Page 350 dial access security. See Security answering a call auto-answer, 5-19, 5-49, 11-2 manual answer, 5-19, 5-49, 10-5, 11-3 AT command, 14-6 backup, 2-7, 7-7–7-8, 10-1, 10-5–10-7, B-2 command modifiers, 10-9, 14-6 DCP controlled, 10-1–10-10 manual dial. See Talk/Data network connection, B-4–B-5 stored telephone number, 10-7–10-10, 14-13 dial line modulation, 5-22, 5-53...
Page 351 Health and Status definitions, 4-3–4-4, 4-14–4-15 Hook Switch Control, AT command, 14-7 Identification, AT command, 14-7 Identity, 4-8–4-9 indicators, status (LEDs), 3-2–3-5 installation Model 3920Plus, 2-3–2-14 Model 3921Plus, 2-8–2-12 Index-4 keypad, 3-7–3-8 LAPM, 5-64, 5-65 LCD (liquid crystal display) description, 3-1, 3-6–3-7 menu structure, 3-9–3-10...
Page 352 Misc configuration options group Multiport mode, 5-31 Singleport mode, 5-73 mixed inbound rates, 5-25, 5-57 MNP5 Compression, 5-65 AT command, 14-14 Model 3920Plus standalone multiport, 1-3 standalone singleport, 1-2 Model 3921Plus carrier-mounted multiport, 1-5 carrier-mounted singleport, 1-4 Model 392xPlus, 1-2...
Page 353 COMSPHERE 392xPlus Modems part numbers, 4-8 passwords administrative, 12-6–12-7 remote access, 5-4–5-9, 5-31, 5-74, 13-2, 13-3, 13-4 security, 12-3–12-4, 12-16–12-17 pattern test, 8-8–8-10 Pause Time Multiport mode, 5-20 Singleport mode, 5-50 phone. See telephone, external phone numbers. See telephone numbers pin assignments, C-2 PList (Poll List) branch, 3-9, 6-1–6-6 Point-to-Point Diagnostic modulation...
Page 354 Security access messages, 3-13–3-14 branch, 3-9, 12-5–12-14 configuration options, 12-14–12-16 database tables, 12-3, 12-4, 12-18–12-21 passwords, 12-3–12-4, 12-16–12-17 singleport mode, 12-1 Special Multiport mode, 5-32 Singleport mode, 5-75 Security configuration options group, 5-78 Select key, 2-11, 3-7, 3-8 self-test, 2-13, 8-3 Send Break Control, 5-68 AT command, 14-13 serial number (Ser #), 4-8...
Page 355 COMSPHERE 392xPlus Modems Tone Dial, 14-7 top-level menu messages, 3-10 Train Time Multiport mode, 5-23 Singleport mode, 5-55 Trellis Multipoint (TMp), 7-11 Troubleshooting, B-1–B-6 Tx Clock Source AT command, 14-12 Multiport mode, 5-10 Singleport mode, 5-42 United States government requirements, 1-10–1-11 UNIX dial, 2-13, 5-2, 5-37 Upstream Port Multiport mode, 5-18...
Page 356 *3920-A2-GH30-40* *3920–A2–GH30–40*...

This manual is also suitable for:

3921plusComsphere 3921plus

Paradyne COMSPHERE 3920PLUS Technical Reference Manual

Table of Contents

Preface

6 Poll List Branch

7 Control Branch

9 Sub-Network Health and Status Branch

11 Talk/Data Branch

13 Remote Branch

1 Introduction

3 Dcp Operation

4 Status Branch

5 Configure Branch

6 Poll List Branch

10 Call Setup Branch

12 Dial Access Security

14 At Command Set and S-Registers

D Itu-T V.25Bis Dialing Command and Responses

Sample Configurations

Quick Links

Chapters

Related Manuals for Paradyne COMSPHERE 3920PLUS

Summary of Contents for Paradyne COMSPHERE 3920PLUS