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Paradyne COMSPHERE 3800PLUS User Manual

Paradyne comsphere modems user's guide 3800plus
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COMSPHERE
3800 P
MODEMS
LUS
USER'S GUIDE
Document No. 3980-A2-GB30-41
February 2002

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Summary of Contents for Paradyne COMSPHERE 3800PLUS

  • Page 1 COMSPHERE 3800 P MODEMS USER’S GUIDE Document No. 3980-A2-GB30-41 February 2002...

  • Page 2: Document Feedback

    Paradyne Corporation makes no representation or warranties with respect to the contents hereof and specifically disclaims any implied warranties of merchantability or fitness for a particular purpose. Further, Paradyne Corporation reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of Paradyne Corporation to notify any person of such revision or changes.

  • Page 3: Important Safety Instructions

    Important Safety Instructions Read and follow all warning notices and instructions marked on the product or included in the manual. Slots and openings in the cabinet are provided for ventilation. To ensure reliable operation of the product and to protect it from overheating, these slots and openings must not be blocked or covered.

  • Page 4: Government Requirements And Equipment Return

    Note that 3810Plus and 3811Plus are the model names for the model numbers 3980 and 3981, respectively. The modems collectively are called 3800Plus modems. United States Notice to Users of the Public Switched Telephone Network 1.
  • Page 5 RENs, contact the telephone company to determine the maximum RENs for the calling area. 4. If the 3800Plus modem causes harm to the telephone network, the telephone company will notify you in advance that temporary discontinuance of service may be required. But if advance notice is not practical, the telephone company will notify the customer as soon as possible.
  • Page 6 COMSPHERE 3800Plus 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 7: Table Of Contents

    Table of Contents Preface 1. Introduction 2. 3810 Plus Installation 3. 3811 Plus Installation 3980-A2-GB30-40 Objectives and Reader Assumptions ......How to Use This Manual .
  • Page 8 COMSPHERE 3800Plus Modems 4. Front Panel Operation 5. Call Setup Branch 6. Status Branch 7. Test Branch 8. Configure Branch 9. Control Branch 10. Remote Branch 11. Security Overview ..........
  • Page 9 12. Fax Operation 13. AT Command Set and S-Registers Appendices Glossary Index 3980-A2-GB30-40 Overview ..........Fax Operation .
  • Page 10 COMSPHERE 3800Plus Modems This page intentionally left blank. October 1998 3980-A2-GB30-40...
  • Page 11 3600 Hubbing Device 3811Plus Modem Installing a 3811Plus Modem 3810Plus Front Panel Optional SDCP, 3811Plus Faceplate, and Optional SDU 3800Plus LCD and Keypad Dial Backup Local Analog Loopback Remote Digital Loopback Local Digital Loopback Pattern Test and Local Analog Loopback Test...
  • Page 12 Modem Integrity Modem – DTE Connection Modem – VF Connection Online Operation Leased-Line Operation Dial Backup Operation Technical Specifications for COMSPHERE 3800Plus Modems EIA-232-D Pin Assignments VF Connector Pin Assignments V.25bis Commands V.25bis Response Messages Factory Default Configuration Options SDC Negotiation Configuration Scenarios...

  • Page 13: Preface

    Chapter 11 describes the Security branch. 3980-A2-GB30-40 Preface Chapter 12 provides general information about operating 3800Plus modems in fax mode. Chapter 13 provides instructions for displaying and changing AT commands and S-Registers. Appendix A provides a menu tree for 3800Plus modems.

  • Page 14: Related Documents

    COMSPHERE 6700 Series Network Management System User’s Guide viii Contact your sales or service representative to order additional product documentation. Paradyne documents are also available on the World Wide Web at: http://www.paradyne.com Select Service & Support October 1998 Technical Manuals...

  • Page 15: Introduction

    3811Plus is a carrier-mounted version of the 3810Plus. Features The 3800Plus modems have a wide variety of features. Dial-Line Modulations: ITU-T V.34 (up to 33,600 bps), V.32terbo (19,200 and 16,800 bps), ITU-T V.32bis (up to 14,400 bps), V.32 (up to 9600 bps), V.22bis (2400 bps), V.22 (1200 bps),...

  • Page 16: Comsphere Models

    See Appendix I, Compression, for more information. Options 3800Plus modems also may have the following optional features: Leased-Line Modulations: ITU-T V.33 (14,400 and 12,000 bps) and ITU-T V.29 (9600, 7200, and 4800 bps).

  • Page 17: Plus Installation

    Overview The standalone 3810Plus modem (Figure capable of either dial or 4-wire/2-wire leased-line operation. It is controlled using AT commands or the diagnostic control panel (DCP). The DCP consists of an LCD which displays selections, three function keys and four directional keys which allow you to maneuver and choose DCP selections, and a row of 13 LED status indicators which display modem activity.

  • Page 18: 3810Plus Modem Installation

    COMSPHERE 3800Plus Modems DIAGNOSTIC CONTROL STATUS LEASED (3810 Plus ONLY) DIAL (OR LEASED FOR 3820 Plus ) DTE 1 Customer-Supplied Equipment The following customer-supplied equipment may be required to complete a data communications system using the 3810Plus modem: A DTE with an available RS-232D serial port.

  • Page 19: Dte Connection

    An 6-pin modular keyed jack for dial (PSTN) lines. A 4-pin modular jack for network management system (NMS) connection. A 25-pin DB-25-S receptacle for DTE interface. Connecting 3810 Plus Modems with Supplied Cables Figure 2-2 shows how 3810Plus modems are connected to certain TELCO jack types using the supplied cables.

  • Page 20: Dial-Line Connection

    COMSPHERE 3800Plus Modems Dial-Line Connection Use the following procedure to connect the 3810Plus modem to the dial network interface: 1. Insert the 6-position, 4-conductor modular plug into the jack labeled DIAL/LEASED 2. Insert the other end of the modular cord into the dial network interface (“demarc”).

  • Page 21: Network Management System Connection

    Network Management System Connection For the 3810Plus modem, use the following procedure to connect the modem to the network management system interface: 1. Insert the subminiature 4-position, 4-conductor modular plug of the 3600 Hubbing Device (Figure 2-3) into the jack labeled NMS (Figure 2-2).

  • Page 22: Removing And Replacing 3810Plus Modems

    COMSPHERE 3800Plus Modems Removing and Replacing 3810 Plus Modems To remove and replace a 3810Plus modem, perform the following steps: 1. Make sure the modem is offline, and toggle the modem’s rear panel power switch to the Off position. 2. Disconnect the power cord from the ac power outlet, and then from the connector on the rear of the modem.

  • Page 23: Plus Installation

    (SDU) while the remaining 16 slots can house up to 16 3811Plus modems, or for mixed networks, a combination of 3811Plus modems and other Paradyne access products, such as Model 3611 data service units. An SDU is a circuit card that provides SDCP and network management interfaces to access products installed in the carrier.

  • Page 24: 3811Plus Modem Installation

    COMSPHERE 3800Plus Modems If the modem is to be managed by a network management system, an SDU must be supplied and properly connected to the network management controller. For proper network management connection to the SDU, refer to the appropriate network management system user’s guide.
  • Page 25 The installation of a 3811Plus varies slightly if an SDCP is installed on the front of the carrier. To install a 3811Plus modem into the carrier without an SDCP, perform the following steps: CAUTION If you remove the 3811 Plus from the carrier, always use a ground strap when handling the modem.

  • Page 26: Removing And Replacing 3811Plus Modems

    COMSPHERE 3800Plus Modems If the modem is to communicate with an installed SDCP, install the modem as described above and perform the following steps: 1. Press the key on the SDCP. The cursor Select appears in the carrier selection entry.

  • Page 27: Front Panel Operation

    Overview This chapter describes how to use the diagnostic control panel (DCP) of the 3800Plus modem. Diagnostic Control Panels There are two types of DCPs: the front panel on the standalone 3810Plus modem, and the shared diagnostic control panel (SDCP), an optional feature used with a 3811Plus modem installed in a COMSPHERE 3000 Series Carrier.

  • Page 28: Status Indicators

    ALARM Figure 4-2. Optional SDCP, 3811 Plus Faceplate, and Optional SDU Status Indicators The status indicators on a 3800Plus modem continuously provide information on the modem’s operating condition. All of the status indicators on the 3810Plus modem are on the DCP...
  • Page 29 Label Color green ON – Power is on and the modem is capable of operating. Alrm Flashing – A malfunction has been detected in either the modem or COMSPHERE 3000 Series Carrier. Diag green The modem has responded to a diagnostic command from network management. (3810 Plus only) Test/142 yellow...

  • Page 30: Dcp Operation

    Modem is in Error Control mode. DCP Operation The 3800Plus modem’s diagnostic control panel (DCP) is the user interface to all functions used to configure and control the modem. This interface includes the status light-emitting diodes (LEDs), and a 2-line, 32-character liquid crystal display (LCD) and keypad (Figure 4-3).
  • Page 31 Remote Mode Indicator If the local 3800Plus modem establishes a connection with the remote 3800Plus modem via the Remote branch, then appears in place of the hidden choice indicator on both modems.

  • Page 32: Menu Structure

    COMSPHERE 3800Plus Modems Menu Structure The menu tree is a hierarchical structure used to display functions that configure and control local and remote 3800Plus modems. It is accessed via the DCP and is shown in Appendix A, Menu Tree. The menu tree contains the following branches:...
  • Page 33 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 4-3, while the bottom line displays the main menu tree branches and operational and dial access security messages, as listed in Table 4-4...
  • Page 34 COMSPHERE 3800Plus Modems Normal Call Setup Messages Off Hook The modem is off-hook and waiting to dial a telephone number. Dialing The remote modem is being dialed. Training The modem is training or retraining. EC Negotiating The local and remote modems are negotiating the highest possible level of error control compatible between both modems.
  • Page 35 Dial Backup Messages Dial Standby The modem is operating in Dial Standby mode. DialBckUp: MR* The modem is operating in a Dial Backup mode at the displayed data rate and is configured for Direct mode. Backup: MR* EC** The modem is operating in Dial Backup mode and is configured for error control and data compression on leased lines.
  • Page 36 COMSPHERE 3800Plus Modems Common Operational Messages Please Wait... Appears when a command to a local device takes more than two seconds to complete. Command Sent... Appears when a command is sent to a remote modem. No Rem Response or Appears when a remote modem does not respond to a command within 5 seconds.

  • Page 37: Selecting Factory Configuration Options

    After the modem passes the power-up self-test, configure it for operation using one of the factory preset configurations. The 3800Plus modems have several factory preset templates that contain the most commonly used configuration options (straps) for Asynchronous Dial, Synchronous Dial, Synchronous Leased (Answer or Originate), UNIX hardware network, cellular mobile, and cellular PSTN configurations.
  • Page 38 COMSPHERE 3800Plus Modems On initial power-up, the modem is in Command mode. To verify that the modem is connected and functioning properly, enter the following: TYPE: PRESS: Return (Enter) The screen displays OK. If the modem does not return OK, refer to Appendix C, Troubleshooting.
  • Page 39 DCP security access selections. Use the DCP security access function to ‘‘lock” the DCP of any 3800Plus modem and prevent unwanted user access. Two options are available for this function: Grant and Deny. Grant allows any branch of the Top-Level menu to be accessed from the DCP.
  • Page 40 COMSPHERE 3800Plus Modems This page intentionally left blank. 4-14 October 1998 3980-A2-GB30-40...

  • Page 41: Overview

    Overview The Call Setup branch of the Top-Level menu allows you to dial, disconnect, and answer telephone calls. It also allows you to create and store up to 10 telephone numbers to directory locations. Six different functions can appear under Call Setup: Dial, Disconnect, Answer, Dial Standby or Return to Dial (when applicable), and Change Directory.
  • Page 42 COMSPHERE 3800Plus Modems Call Setup Branch In the following descriptions, the shaded key indicates what key to press to perform the described operation. To access the Call Setup branch from the Top-Level menu, select Call Setup: Idle: 28.8 Call_Setup Dial Dial allows you to dial any telephone number stored in directory locations 1–10.

  • Page 43: Dial Standby/Return To Dial

    Select Disconnect. Disconnect Command Complete The modem goes on-hook (hangs up) and the call is disconnected. This includes any calls being used for dial backup of leased lines. The Command Complete status message is displayed. To exit this function and remain in the Call Setup branch, press the key.

  • Page 44: Change Directory

    COMSPHERE 3800Plus Modems For example, under normal dial backup conditions, when a problem occurs on the leased line, the modems establish a connection over the dial network using a telephone number stored in directory location 1. Call Setup: Dial Standby When this occurs, the Dial Standby function now appears on the LCD.
  • Page 45 To access Change Directory from the Call Setup branch, make the following selections: Call Setup: Change_Directory Press the key until Change Directory is displayed. Press any function key to select Change Directory. 01 : 5551234 " The phone number listed in directory location 1 is displayed.
  • Page 46 COMSPHERE 3800Plus Modems 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 3800 Plus modems recognize: T – Tone (DTMF) dial. Any digit 0–9, *, #, A, B, C, or D can be dialed as tone.

  • Page 47: Status Branch

    Overview The Status branch of the Top-Level menu allows you to view the current status of the dial or leased-line connection, the DTE interface, and the identity (for example, serial number and model number) of your equipment. There are up to five selections under Status: VF, Identity, DTE, Options, and Record.
  • Page 48 COMSPHERE 3800Plus Modems VF displays the condition of the dial or leased-line connection. To access VF from the Status branch, make the following selection: Status: Identity Select VF. Status : VF SigQual = Excelent The modem’s signal quality is displayed on the LCD’s bottom line.
  • Page 49 Identity Identity displays the modem’s serial number, model number, firmware revision level, hardware part number and firmware part number. Retrieval of this information is useful if you are purchasing additional or replacement modems and/or making firmware upgrades. To access Identity from the Status branch, make the following selection: Status: Identity...
  • Page 50 COMSPHERE 3800Plus Modems DTE displays the state and/or activity of the EIA-232-D interface leads: LSD, DTR, DSR, Tst, TXD, RXD, RTS, and CTS signals are monitored. The interface leads status is updated every 5 seconds. To access DTE from the Status branch, make the...
  • Page 51 To access Record from the Status branch, make the following selections: Status Options Record Press the key until Record appears. Select Record. Record Status Display Clear To display sequence faults, select Display. 3980-A2-GB30-40 < The LCD displays the first sequence fault field. (Sequence fault fields range from 1 to 8 and are identified by a number in the upper right corner.) Press the to view the remaining fields.
  • Page 52 COMSPHERE 3800Plus Modems This page intentionally left blank. October 1998 3980-A2-GB30-40...

  • Page 53: Overview

    Overview 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 54 COMSPHERE 3800Plus Modems Test Branch To access the Test branch from the Top-Level menu, make the following selections: Idle : 28.8 Status Test Press the key until Test appears. Select Test. Abort Abort ends any test that is in progress and brings the modem back to the normal mode of operation.
  • Page 55 Loc Analog Loop Loc Analog Loop performs a local analog loopback (ITU-T V.54 Loop 3), Figure 7-1, 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 56: Configure Branch

    COMSPHERE 3800Plus Modems Rem Digital Loop Rem Digital Loop performs a remote digital loopback (ITU-T V.54 Loop 2), Figure 7-2. This test can verify the integrity of the local modem, the communications link, and the remote modem. Any data or pattern entered at the local DTE is sent to and returned from the remote modem.
  • Page 57 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 7-3). (This test operates the same as an 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 58 COMSPHERE 3800Plus Modems Pattern Pattern can transmit and receive a 511 bit error rate test pattern. It can also be used with a local analog loopback or a remote digital loopback to simulate data passing through the modem. For this test to operate properly, the modems must be online and in Synchronous or Asynchronous Direct mode.
  • Page 59 To access Pattern from the Test branch, make the following selections: Test : Pattern Press the key until Pattern appears. Select Pattern to start this test. Test : Pattern Blks Errd = xxxxxxx BlksErrd=xxxxxxx displays the number of blocks of data found in error (block size is 1000 bits per block).
  • Page 60 COMSPHERE 3800Plus Modems This page intentionally left blank. October 1998 3980-A2-GB30-40...

  • Page 61: Overview

    Overview After installing a 3800Plus modem, you set its software configuration options using either the diagnostic control panel (DCP) or the AT command set. This chapter describes how to access and use the Configure branch of the Top-Level menu via the DCP.
  • Page 62 COMSPHERE 3800Plus Modems CONTENTS OF Active (Saved) ARE AUTOMATICALLY COPIED TO Active (Operating) WHEN A SAVE IS COMMANDED VIA THE DCP, ON A RESET, OR ON POWER-UP Active (Operating) Save Active (Saved) Customer 1 Customer 2 Load Edit Area From...
  • Page 63 Active (Saved) (ATZ0, ATZ3) NOTE ON POWER-UP, Active (Saved) IS LOADED TO Active (Operating) Active (Saved) (AT&W0) Figure 8-2. AT Command Configuration Process 3980-A2-GB30-40 Customer 1 Customer 2 (ATZ1) (ATZ2) • Async Dial (AT&F0) • Sync Dial (AT&F1) • Sync Leased Answer (AT&F2)
  • Page 64 COMSPHERE 3800Plus Modems Configure Branch The Configure branch of the Top-Level menu contains all of the modem’s configuration options (straps) which determine how the modem operates. These configuration options are accessed by scrolling down and across various levels of the Configure branch.
  • Page 65 The following example shows how to change the Remote Access Password using the DCP. (If you ever intend to access another 3800Plus Series modem via the Remote branch of the Top-Level menu, the Remote Access Password must be the same for both modems.) By...
  • Page 66 COMSPHERE 3800Plus Modems Select the F2 (°) key to increment password values. RemAccssPasswrd °00000000 Press the key to move the cursor to the next position. RemAccssPasswrd °12345678 Continue this sequence until you have entered the new password value. To save the new password to a configuration area, make the following selections.

  • Page 67: Configuration Tables

    Configuration Tables The modem’s configuration options are arranged into eight groups based upon functionality: Interface (Table 8-1), DTE Dialer (Table 8-2), Line Dialer (Table 8-3), Dial Line (Table 8-4), Leased Line (Table 8-5), V.42/MNP/Buffer Test (Table 8-7), and Misc (Table 8-8). Throughout these tables, two selections frequently appear on the LCD: Enable and Disable.
  • Page 68 COMSPHERE 3800Plus Modems Sync DTE Rate:128000 Nxt 128000 115200 112000 96000 76800 72000 64000 57600 56000 48000 38400 28800 19200 14400 9600 4800 2400 1200 This configuration option only appears if SDC is enabled. Synchronous DTE Data Rate. Determines the bit rate of data transferred between the synchronous DTE and the modem during SDC operation.
  • Page 69 Configure Branch Table 8-1 (3 of 7) DTE Interface Configuration Options # Stop Bits: 1 Nxt 1 2 Number of Stop Bits. Selects 1 or 2 bits to signal the end of an asynchronous character. The factory default is 1. There is no AT command equivalent;...
  • Page 70 COMSPHERE 3800Plus Modems DSR Control: Forced_On Nxt Forced_On Stndrd_RS232 WinkWhenDisc Follows_DTR On_Early Delay_ToData DialBkToggle Data Data Set Ready Control. DSR is a signal from the modem to the DTE indicating the modem is connected and ready for operation. Forced On – Forces DSR output ON constantly. This is usually used for leased-line applications and when the DTE requires DSR to always be ON.
  • Page 71 RTS Action: Ignore Nxt Ignore Stndrd_RS232 Sim_Cntl_Car Cntl_Car Request-to-Send Action. RTS is a signal from the DTE to the modem indicating the DTE has data to send to the modem. Ignore – Modem assumes RTS is always ON. Use this selection when the DTE does not provide RTS to the modem. Standard RS232 –...
  • Page 72 COMSPHERE 3800Plus Modems RTS/CTS Delay: 0 msec Nxt 0msec 10msec 50msec 150msec 600msec Request-to-Send/Clear-to-Send Delay. RTS/CTS Delay sets the delay time between the modem receiving RTS from the DTE and the modem sending CTS to the DTE. This delay is only valid in Async Direct mode and synchronous applications when it is necessary to have a short delay between the time the DTE raises RTS and the time the modem presents CTS to allow the DTE to send data.
  • Page 73 Configure Branch Table 8-1 (7 of 7) DTE Interface Configuration Options TX Clock Source: Internal Nxt Internal External RXC_Loop Transmit Clock Source. Determines the source of timing for synchronous data transmitted from the DTE. Internal – The transmit data’s clock source is derived from the modem’s internal clock and output on Pin 15 (TXC) of the RS-232D interface.
  • Page 74 COMSPHERE 3800Plus Modems DTE Dialer The DTE Dialer configuration options establish the DTE-to-modem protocol for call establishment and control. DTE Dialer Type: AT Nxt AT Disable V25bis_Async V25bis_Bsync V25bis_HDLC DTR=Dirs AT&T_Exclusve DTR=Backup Data Terminal Equipment Dialer Type. Identifies to the modem the type of dialing method and protocol used by the DTE.
  • Page 75 *AT Escape Char: 043 ASCI Nxt " 043 ASCI AT Escape Character. The escape sequence (+++) allows you to move back and forth between Command mode and Data mode. The ASCII value of the escape character (43 ASCII) can be set to any ASCII value from 0 ASCII to 255 ASCII.
  • Page 76 COMSPHERE 3800Plus Modems *Backspace Char: 008 ASCI 008 ASCI Backspace Character. Sets the character used to perform a backspace in Command mode. The factory default is 08 (ASCII backspace character). AT command equivalent is S-register S5= n . *Linefeed Char: 010 ASCI 010 ASCI Line Feed Character.
  • Page 77 *ResultCode Form: Words Nxt Words Numbers (1) Numbers (2) 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; therefore, numbers are required. The Numbers (2) format is required for some modem pooling applications.
  • Page 78 COMSPHERE 3800Plus Modems *AT Cmnd Mode: Normal Nxt Normal No_ERROR NoStrapOrERR AT Command Mode. Determines how the modem responds to valid and invalid AT commands. NOTE: Since this configuration option affects AT commands, it cannot be changed by the AT&F command. However, it can be changed by selecting a factory preset configuration via the DCP.
  • Page 79 Line Dialer The Line Dialer configuration options establish parameters used by the modem to answer or originate calls. AutoAnswerRing#: 1 Nxt 1 Disable 2 4 6 8 10 Auto-Answer Ring Count. Determines the number of rings necessary before the answering modem answers an incoming call.
  • Page 80 COMSPHERE 3800Plus Modems BusyTone Detect: Enable Nxt Enable Disable Busy Tone Detect. Sets the modem to monitor for Busy Tone (Enable) or ignore Busy Tone (Disable). This configuration option is normally enabled; however, if the modem receives false busy tones, this configuration option can be disabled and the modem ignores all busy tones.
  • Page 81 Configure Branch Table 8-3 (3 of 5) Line Dialer Configuration Options 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 when it goes on-hook. Issuing a long space is one method of disconnecting a call. NOTE: This configuration option is ignored when the modem operates in Synchronous mode or Dial Backup mode.
  • Page 82 COMSPHERE 3800Plus Modems NoDataDiscTrig: TXD and RXD Nxt TXD and RXD TXD Only RXD Only TXD or RXD No Data Disconnect Trigger Signal. Works in conjunction with No Data Disconnect (\T), and determines whether Pin 2 (transmit data) or Pin 3 (receive data) of the modem’s RS-232 serial interface is monitored so that the modem can disconnect the call if there is no activity for a certain period of time.
  • Page 83 DTR Auto Redial: Dir 1 Nxt Dir 1 Dirs1-2 Dirs 1-3 Dirs 1-4 Dirs 1-5 Dirs 1-6 Dirs 1-7 Dirs 1-8 Dirs 1-9 Dirs 1-10 DTR Auto Redial. Defines the number of directory locations the modem may access when prior dialing attempts fail. For example, the selection Dirs1-10 means that all ten directory locations may be tied.

  • Page 84: Dial Line

    COMSPHERE 3800Plus Modems Dial Line The Dial Line configuration options are used to configure the modem for operation over dial lines. Modulation: V34 Nxt V34 V32bis/terbo V21/V22/BELL Modulation determines the modem’s primary dial modulation group: V.34; V.32bis and V.32 terbo ; or V.21, V.22bis, V.22, Bell 212A, and Bell 103J.
  • Page 85 Configure Branch Table 8-4 (2 of 4) Dial Line Configuration Options Automode: Enable Nxt Enable Disable System 85 Automode. Allows the modem to automatically detect the remote modem’s modulation. Enable – The modem automatically adapts to the modulation scheme and line rate of the remote modem, and the VF line condition.
  • Page 86 COMSPHERE 3800Plus Modems Dial TX Level: Permissv(– 9) Nxt Permissv(– 9) –10 dBm –11 dBm –12 dBm –13 dBm –14 dBm –15 dBm –16 dBm –17 dBm –18 dBm –19 dBm –20 dBm –21 dBm –22 dBm –23 dBm –28 dBm –29 dBm –30 dBm –31 dBm –32 dBm ETC 1.0_Cell ETC 1.1_Cell...
  • Page 87 Proactive Retrain: Enable Nxt Enable Disable Proactive Retrain. When enabled, the dial line connection is monitored, and if the Signal to Noise Ratio drops 1.2 dB or more, the modem forces a retrain. This may prevent bit errors at higher rates over marginal lines. Disabling Proactive Retrain reduces the number of retrains while increasing the exposure to bit errors.
  • Page 88 COMSPHERE 3800Plus Modems Leased Line The Leased Line configuration options are used to configure the modem for operation over leased lines. NOTE The Leased Line configuration group only appears if the modem is configured with the Sync Leased factory preset template.
  • Page 89 *LeasedLine Rate: 33600(V34) Nxt 33600(V34) 31200(V34) 28800(V34) 26400(V34) 24000(V34) 21600(V34) 19200(V34) 16800(V34) 14400(V34) 12000(V34) 9600(V34) 7200(V34) 4800(V34) 2400(V34) - OR - Nxt 19200(V32t) 16800(V32t) 14400(V32b) 12000(V32b) 9600(V32b) 7200(V32b) 4800(V32b) - OR - Nxt 2400(V22bis) - OR - Nxt 14400(V.33) 12000(V.33) 9600(V.29) 7200(V.29) 4800(V.29) Leased-Line Rate.
  • Page 90 COMSPHERE 3800Plus Modems *Leased TX Level: 0 Nxt 0 – 1 – 2 – 3 – 4 – 5 – 6 – 7 – 8 – 9 – 10 – 11 – 12 – 13 Leased Transmit Level. Selects the modem’s transmit power level over leased lines. The transmit output level can be selected in 1 dBm decrements from 0 dBm to –15 dBm.
  • Page 91 *Auto Redial Nxt Dir_1 Dirs_1-2 Dirs_1-3 Dirs_1-4 Dirs_1-5 Dirs_1-6 Dirs_1-7 Dirs_1-8 Dirs_1-9 Dirs_1-10 Auto Redial. Works in conjunction with the Bad Lines Auto Originate and Rate Auto Originate options. It allows repeated automatic dial backup attempts by specifying the range of directory locations that can be tried. The modem must be in Originate mode.
  • Page 92 COMSPHERE 3800Plus Modems Asymmetric Rate: Enable Nxt Enable Disable Asymmetric Rate. Controls rate symmetry when running V.34 modulation. (This configuration option does not appear unless V.34 modulation is selected.) Enable – The modem operates in asymmetric rate mode (the transmit and receive rates can be different) when running V.34 modulation.
  • Page 93 V.42/MNP/Buffer 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. If the Async/Sync Mode configuration option is set for synchronous operation (see DTE Interface configuration options group), then the V.42/MNP/Buffer group does not appear on the LCD.
  • Page 94 COMSPHERE 3800Plus Modems Sync Comp Mode: DirectMode Nxt DirectMode HDLC/SDLC This configuration option only appears if Async/Sync Mode is configured for Sync. Synchronous Compression Mode. Enables and disables synchronous data compression. DirectMode – Disables the Synchronous Data Compression mode. HDLC/SDLC – Enables the Synchronous Data Compression mode The AT command for Sync Comp Mode is #SC n .
  • Page 95 Configure Branch Table 8-6 (3 of 8) V.42/MNP/Buffer Configuration Options SyncDTE CRC: Ignore Nxt Ignore CRC16 This configuration option only appears when the Async/Sync Mode configuration option is set to Sync, and Sync Comp Mode configuration option is not set to DirectMode. Synchronous DTE CRC.
  • Page 96 COMSPHERE 3800Plus Modems V42bis Compress: Enable Nxt Enable Disable This configuration option only appears when Async/Sync Mode is configured for Async. V.42bis Compression. Enables or disables V.42bis data compression. Enable – Data compression operates in both the transmit and receive directions. This is the recommended setting for all applications.
  • Page 97 EC Fallbck Char: 013 ASCI Nxt " 013 ASCI This configuration option only appears when Async/Sync Mode is configured for Async. Error Control Fallback Character. This configuration option allows you to enter the ASCII value of the error control fallback character. This provides the remote modem with the ability to end the error control link negotiating (handshaking) sequence by sending this character.
  • Page 98 COMSPHERE 3800Plus Modems XON/XOFF Psthru: Disable Nxt Disable Enable This configuration option only appears when Async/Sync Mode is configured for Async. XON/XOFF Passthrough. Considers an XON/XOFF character as data and passes it on to the remote modem. In this case, the DTE at one end of the communications link can send flow control characters to the other DTE. This is also known as DTE to DTE flow control.
  • Page 99 Send Break Cntl: Data-First Nxt Data-First Break-First This configuration option only appears when Async/Sync Mode is configured for Async. Send Break Control. Determines what is sent from the modem first, data or break if a break sequence is sent from the DTE.
  • Page 100 COMSPHERE 3800Plus Modems Max Frame Size: 256 Nxt 256 192 128 64 32 16 This configuration option only appears when Async/Sync Mode is configured for Async, and Error Control Mode is not configured for BufferMode or DirectMode, or when Async/Sync Mode is configured for Sync and Sync Comp Mode is not configured for DirectMode.
  • Page 101 Test The Test configuration options determine specifics, such as the duration of a test, for the various diagnostic tests available to the modem. DTE RL (CT140): Disable Nxt Disable Enable DTE Remote Loopback. Controls the use of Pin 21 of the RS-232D/ITU-T V.24 interface by the DTE to initiate a remote loopback.
  • Page 102 COMSPHERE 3800Plus Modems V54 Address: Disable Nxt Disable (Address Values) V.54 Address. Determines which remote 3800 Plus modem is placed into a remote loopback test. This can be either a remote digital loopback or local analog loopback. This type of addressing can be used for extended data circuits (tail circuits).
  • Page 103 Misc The Miscellaneous configuration options determine specifics for various functions, including network management parameters and remote modem access. StrapsWhenDisc: No_Change Nxt No_Change Reload RelodNoATChg Straps When Disconnected. Determines whether or not configuration options in the Active (Saved) configuration area are reloaded to Active (Operating) when a disconnect occurs. This is useful in modem pooling applications. No Change –...
  • Page 104 COMSPHERE 3800Plus Modems Speaker Volume: Medium Nxt Medium Low High Speaker Volume. Controls the level of speaker volume. The factory default is Medium. NOTE: Speaker Volume can also be temporarily set using the Control branch; however, a reset or power cycle will restore the modem to the Speaker Control and Speaker Volume configuration option settings.
  • Page 105 Configure Branch Table 8-8 (3 of 3) Miscellaneous Configuration Options NMS_Call_Msgs: CallCnct&Prg Nxt CallCnct&Prg Disable CallCnctOnly CallProgOnly NMS Call Messages. Determines if modem status and/or call summary information is sent to the 6700 Series NMS. The modem can itemize status, such as CallProgress messages, or it can report a summary of activity, such as Call Connect messages, to the NMS.

  • Page 106: Security Configuration Options

    COMSPHERE 3800Plus Modems Security Configuration Options The Security Configuration Options group allows you to view and set dial access security parameters. This group appears only if the dial access security feature has been installed. *EntryWait_Time: 20 sec Nxt 20 sec 10 sec 40 sec 60 sec Entry Wait Timeout.
  • Page 107 Configure Branch Table 8-9 (2 of 2) Security Configuration Options *DTE_PW_BkSpChar: 008 " DTE Password Backspace Character. Sets the character that is used to perform a backspace in security mode. This character can be set to any ASCII value from 0 to 127. The factory default is 08 (ASCII backspace).
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  • Page 109: Control Branch

    Overview 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. The 3811Plus modem has the additional hardware function, Service Line. 3980-A2-GB30-40 Control Branch Control Branch To access Control from the Top-Level menu, make the following selections: Idle : 28.8...
  • Page 110 COMSPHERE 3800Plus Modems 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 in Chapter 8, Configure Branch.
  • Page 111 Make Busy/Remove Make Busy The Make Busy function forces the modem off-hook so it cannot answer a call. This is often used with PBX systems to permit the busy out of a PBX port for rotary or hunt groups. WARNING To not violate FCC and DOC regulations, this function must only be used behind a...

  • Page 112: Download Code

    The second selection appearing on the LCD is To Local via DTE. This function permits firmware upgrades to be transferred to a 3800Plus modem. This type of download requires a locally attached PC-controller to be connected to the modem’s DTE port as well as special download software.
  • Page 113 V.34, V.33, V.32bis, V.32, or V.29. No Response The remote modem is not a 3800Plus modem or the connection between the two modems is poor. Access Disabled The remote modem’s Access from Remote configuration is disabled.

  • Page 114: Automatic Firmware Download

    Automatic Firmware Download New releases may be available for the 3800Plus modem. The latest 3800Plus firmware is available at no charge from the Automatic Firmware Download Center. Refer to page A in the front of this document for contact information.

  • Page 115: Remote Branch

    Overview The Remote branch of the Top-Level menu allows you to control the remote modem’s DCP using the local modem’s DCP. This allows you to change configuration options and control test functions in a remote modem. Remote DCP access is only available when using V.34, V.32terbo, V.32bis, or V.32 modulation schemes.
  • Page 116 Top-Level menu of the remote modem appears on the local modem’s LCD. An in the upper right-hand corner indicating that what is displayed on your LCD is actually the Top-Level menu of the remote 3800Plus modem. October 1998 Select Channel >...
  • Page 117 The Top-Level menu of the remote 3800Plus modem is similar to the local 3800Plus modem with the following exceptions: Change Directory is the only function available under the Call Setup branch. Self and Local Analog Loop do not appear under the Test branch when using the secondary channel.
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  • Page 119: Security

    3980-A2-GB30-40 Security Dial Access Security is an optional feature that allows you to control who has access to your 3800Plus modem and ultimately your host DTE. To take advantage of this security feature, you must create a database of passwords which are stored in the modem’s nonvolatile memory.
  • Page 120 COMSPHERE 3800Plus Modems Originate Access Security Originate Access lets you control who can originate a call from a local modem via the AT command set. This is useful in LAN and modem pooling applications. With Originate Access security, a local user’s password is embedded in the AT dial command.
  • Page 121 VF Password Timeout or an Unknown VF Password, first verify that the answering 3800Plus modem’s VF Prompt Type is set for 2nd Dial Tone. Next, verify that the Dial Tone Detect configuration option in the originating modem is enabled. Third, insert several Pause (,) modifiers into the dial string instead of the W modifier.

  • Page 122: Security Branch

    COMSPHERE 3800Plus Modems 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.
  • Page 123 Select Index Select Index allows a specific record to be retrieved. Index addresses range from 0001 to 0020 for all 3800Plus modems and from 0001 to 3000 for a 3811Plus with Extended Security. The contents of this record can be viewed, edited, and saved.
  • Page 124 COMSPHERE 3800Plus Modems Select Index " 0001 Select Index appears. Press the F2 (") key to increment index values. Press the key to move the cursor to the next position. Continue this sequence until the desired index appears, and then press Ent.
  • Page 125 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 option only identifies the type of password used.
  • Page 126 COMSPHERE 3800Plus 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 127 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. Set Orig Sec No_OrigSec EnaOrigSec Set Originate Security.
  • Page 128 COMSPHERE 3800Plus 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. NOTE If this value is forgotten, then the...

  • Page 129: Security Password Entry Techniques

    VF Password Timeout or an Unknown VF Password, first verify that the answering 3800Plus modem’s VF Prompt Type is set for 2nd Dial Tone. Next, verify that the Dial Tone Detect configuration option in the originating modem is enabled. Third, insert several Pause (,) modifiers into the dial string instead of the W modifier.

  • Page 130: Database Table Examples

    Originate Access Password An Originate Access password is entered by a local user to gain access to a local 3800Plus modem. This password is embedded in the AT dial command and cannot be entered from the diagnostic control panel (DCP).
  • Page 131 Table 11-5 is an example of a database table with passwords configured for DTE Entry only. This type of password is entered via the originating user’s DTE. Table 11-5 Security Database Table Using DTE-Side Password DTE Password Only Index Password Type 1001 winter...
  • Page 132 COMSPHERE 3800Plus Modems Table 11-7 is an example of a security database table that uses paired VF and DTE passwords for use in VF_w/_DTE answer security mode. Table 11-7 Security Database Table Using Paired VF-Side and DTE-Side Passwords VF and DTE Passwords...

  • Page 133: Fax Operation

    Your 3800Plus modem supports Class 1 (EIA 578) and Class 2 (EIA/TIA SP-2388) Group III fax, using V.17, V.29, or V.27ter modulations.
  • Page 134 COMSPHERE 3800Plus Modems Your fax software uses AT commands to tell the modem what to do. These commands, and the replies your modem makes (such as “OK”) may be displayed on your computer terminal during fax operation, but this depends on your software.

  • Page 135: At Command Set And S-Registers

    Escape Sequence and Escape Guard Time The escape sequence is only issued when the modem is online and in Data mode. The 3800Plus modem uses three consecutive plus (+) characters as the escape sequence. (To change this value, refer to S-register S2 discussed in Table 13-2 in the S-Register Format section.)

  • Page 136: At Command List

    AT. (See &Mn and &Qn commands.) Table 13-1 lists all AT commands supported by the 3800Plus modem. The first column lists the AT command. The second column defines and lists all possible values for that command. The Async Dial factory default is listed in bold.
  • Page 137 AT Command Repeat Last Command Re-executes 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. ITU-T/Bell Mode Determines the protocol used if the dial-line rate is set to 300 or 1200 bps. It has no effect if the rate is set to another value.
  • Page 138 COMSPHERE 3800Plus Modems AT Command Dial Begins the dialing sequence. The dial string n (modifiers and telephone number) is entered after the D command. Any digit 0–9, * , # , A, B, C, D, may be dialed as a DTMF tone. Only the digits 0–9 can be dialed in Pulse Dial mode.
  • Page 139 AT Command DS= n Dial Stored Number Dials the number stored in Location n (1–10). (To store a telephone number, refer to the &Z n=x command.) If any character is received from the DTE before the modem goes online, the dial sequence is aborted. This is known as any-key abort. Command Character Echo Disables echo to the DTE.
  • Page 140 COMSPHERE 3800Plus Modems AT Command Pulse Dial Sets the modem for pulse dial mode. See the D n command. Result Codes Enables modem to send result codes to the DTE. Disables modem from sending result codes to the DTE. Enables in Originate mode only for modem to send result codes to the DTE.
  • Page 141 AT Command Extended Result Code, Dial Tone Detect, and Busy Tone Detect Configuration Options Extended Result Code Enable. Displays all result codes listed in Appendix B except for error control suffix. Disable. Only displays OK, CONNECT, RING, NO CARRIER, ERROR. Add/EC.
  • Page 142 COMSPHERE 3800Plus Modems AT Command +FCLASS= n Service Class Selection Normally set by fax software, Service Class Selection determines the fax protocol. The command is sent to the modem in the format +FCLASS= n , where n can be set to one of three values:...
  • Page 143 AT Command &F n Select Factory Default Configuration Options Loads factory configuration options into Active (Operating) area. &F0 Async Dial &F1 Sync Dial &F2 Sync Leased: Answer &F3 UNIX Dial &F4 Sync Leased: Originate &F5 Cellular (Mobile) &F6 Cellular (PSTN) The &F5 and &F6 commands are available only if ETC is installed.
  • Page 144 COMSPHERE 3800Plus Modems AT Command &I Dial Transmit Level When Dial Transmit Level Type is set to Permissive, &I n sets Dial Transmit Level to a value between –10 and –32 dBm. &I99 and &I100 are available only if Enhanced Throughput Cellular (ETC) is installed and cause the level to be varied automatically according to conditions for ETC operation.
  • Page 145 AT Command &M n Async/Sync Mode and DTE Dialer Type and &Q n &M0, &Q0 Modem operates in Asynchronous mode and uses AT Command protocol. &M1, &Q1 Modem operates in Synchronous mode and uses 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 ON.
  • Page 146 COMSPHERE 3800Plus Modems AT Command &T n 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.
  • Page 147 AT Command \A n Error Control Maximum Frame Size \C n Error Control Negotiate Buffer Disable. Enable. Disables and switches modem to Buffer mode. \D n CTS Control Forced On. Forces CTS to always ON. Standard RS232. Wink When Disconnect. CTS is turned Off for 1 to 2 seconds upon a disconnect.
  • Page 148 COMSPHERE 3800Plus Modems AT Command \Q n Flow Control of DTE, Flow Control of Modem \T n No Data Disconnect Timer Disable. \T n Where n is a value from 1 to 255 in 1-minute increments. \X n XON/XOFF Passthrough Flow Control Disable.
  • Page 149 AT Command %B n , %BL n Modulation/Data Rate Sets the modulation and maximum dial VF rate. The same function can be performed with S-register S41; the %B and %BL commands are provided for compatibility with environments where those commands are used. The %B300 and %B1200 commands work in conjunction with the B (ITU-T/ Bell Mode) command to determine modulation.
  • Page 150 COMSPHERE 3800Plus Modems AT Command Async DTE Rate Sets the DTE rate for Asynchronous mode. This configuration option has no effect in Sync or Async Direct modes, where the DTE rate always equals the VF rate. %R n must be the last command in a command string.
  • Page 151 AT Command #SC n Sync Comp Mode Enables and disables synchronous data compression. #SC0 Disable Synchronous Data Compression mode. #SC1 Enable Synchronous Data Compression mode. The factory setting is Disable. IH n V.42bis Compression Disable. Transmit only. (Not available from DCP.) Receive only.

  • Page 152: S-Register List

    S-registers are only applicable when the DTE Dialer Type configuration option is set for AT. (See &Mn command.) Table 13-2 lists all S-registers supported by 3800Plus modems. The first column lists the S-register. The second column lists all possible values for that register. The third column lists the key sequence used to enter the equivalent from the front panel.
  • Page 153 AT Command Line Feed Character Register determines ASCII value used as the line feed character. Enter a value from 0–127 for the line feed character. Factory setting is 10 (ASCII carriage return or line feed). Backspace Character Register determines ASCII value used as the backspace (Backspace key). This character moves the cursor to the left and erases the previous character.
  • Page 154 COMSPHERE 3800Plus Modems AT Command Asymmetric Rate Mode – Dial Line Register determines whether VF rates for transmitting and receiving are identical when using V.34 modulation. Enabling the function permits the two rates to be different. Register has the following values:...
  • Page 155 AT Command SDC Negotiation Controls negotiation between two modems attempting to connect using SDC. Register has the following values: 0 = LAPM_Buffer 1 = LAPM_Discon The factory setting is LAPM_Buffer. SDC Idle Fill Determines whether the modem uses an HDLC flag or mark to fill the time between DTE frame transfers.
  • Page 156 COMSPHERE 3800Plus Modems AT Command SyncDTE CRC Determines whether the CRC of the DTE frame is transmitted from modem to modem. Register has the following values: 0 = Ignore 1 = CRC16 The factory setting is Ignore. Buffer Size In Buffer Mode Limits the amount of data buffered during Buffer Mode operation.
  • Page 157 AT Command DTR Auto Redial DTR Auto Redial allows repeated automatic dial backup attempts by specifying the range of Directory Locations that can be tried. A redial attempt is made in response to a bad phone number, a busy signal, no answer, or no quiet answer.
  • Page 158 COMSPHERE 3800Plus Modems AT Command 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/V32) 4=7200 (V.32bis) 5=4800 (V.32bis/V.32) 6=2400 (V.22bis) 7=1200 (V.22) 8=1200 (212A) 10=0–300 (V21)
  • Page 159 AT Command 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: 0, 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)
  • Page 160 COMSPHERE 3800Plus Modems AT Command Auto Dial Standby Register determines if the modem performs an automatic dial standby if in Dial Backup mode. Register has the following values: 0=Disable 1=15 minutes 2=1 hour 3=4 hours 255=Test(2min) Factory setting is Disable.
  • Page 161 AT Command V.54 Address Identifies the address of the modem to be placed in a loopback test. Register has the following values: 0 =Disable 1–34 =Modem address Factory setting is Disable. V.54 Device Type Identifies where the modem is physically located in the network. Register has the following values: 0=Peripheral 1=Intermediate...
  • Page 162 COMSPHERE 3800Plus Modems AT Command V.25bis Coding Register identifies to the modem the type of coding used by the DTE while in V.25bis mode. Register has the following values: 0=ASCII 1=EBCDIC Factory setting is ASCII. V.25bis Idle Character Register identifies to the modem the type of idle fill used by the DTE while in V.25bis mode.
  • Page 163 AT Command Network Position Identification Register identifies each modem as either a control or tributary modem. Register has the following values: 0=Tributary 1=Control Factory setting is Tributary for the 3810 Plus . Factory setting is Control for the 3811 Plus . Network Management Address Register determines the modem’s network address.
  • Page 164 COMSPHERE 3800Plus Modems AT Command No Data Disconnect Trigger Signal Register determines whether Pin 2 (transmit data) or Pin 3 (receive data) of the modem’s RS-232 serial interface is monitored so that the modem can disconnect the call if there is no activity for a certain period. (See the \T command.)
  • Page 165 AT Command Straps When Disconnected Register determines whether the Active(Operating) area is reloaded upon a disconnect. Register has the following values: 0 (or 231)=No Change 1 (or 232)=Reload 2 (or 233)=Reload with No AT Change NOTE: Reload with No AT Change can be saved only if the save command (&W) follows the S88=2 command on the same command line.
  • Page 166 COMSPHERE 3800Plus Modems AT Command V.29 Train On Data Register determines whether the modem must receive a standard V.29 training sequence in order to enter data mode (Disable) or whether it should use the received data mode for training (Enable). Effective only if the V.29 feature is installed and V.29 is selected for the leased-line rate.

  • Page 167: Menu Tree

    Menu Tree Overview The following pages hold graphic representations of the general menu structure of the front panel or SDCP displays. The model, installed features, and configuration options all may affect what is actually displayed at each level of the menus. 3980-A2-GB30-40 October 1998...
  • Page 168 COMSPHERE 3800Plus Modems Call_Setup Dial Answer Change_Directory Disconnect Dial_Standby Return_to_Dial Directory Locations 1 – 10 Does not appear in Remote Mode. (Rem_Digital_Loop, Loc_Digital_Loop, and Pattern appear if the secondary channel is used.) Some choices within this group may not appear depending upon how previous configuration options have been selected.
  • Page 169 from previous page Activ (Operating) Active (Saved) from previous page Leased_Line V42/MNP/Buffer Leased Mode Err Contrl Mode Modulation Sync Comp Mode LeasedLine Rate SDC Negotiation Autorate SDC Idle Fill Leased TX Level SDC BitEncoding Bad Ln Auto Orig SyncDTE CRC Rate Auto Orig SDC Delay Min Auto Redial...
  • Page 170 COMSPHERE 3800Plus Modems from previous page Control Speaker RemoveMakeBusy Reset Remote Secondary Prim (data blckd) (ExitRem appears instead of Remote when using Remote Mode) EditPassWdTable Make_Busy Download Code Service_Line DiscServLine Does not appear in Remote Mode. (Rem_Digital_Loop, Loc_Digital_Loop, and Pattern appear if the secondary channel is used.)

  • Page 171: Result Codes

    Overview Table B-1 lists all the result codes 3800Plus modems may send to the DTE. Result codes can be numeric or verbal, terse or extended. See the Qn, Vn, and Xn commands in Chapter 13, AT Command Set and S-Registers for more information.
  • Page 172 COMSPHERE 3800Plus Modems Numbers (1) Numbers (2) *Appears when the Extended Result Codes configuration option is enabled. **Appears when the Extended Result Codes configuration option is set for Use_DTE_Rate. This displays the DTE data rate instead of the line rate.
  • Page 173 Numbers (1) Numbers (2) *** Appears when the Extended Result Codes configuration option is set for Add/EC. If this configuration option is set for Add/V42,MNP, then V42b, V42, MNP5, MNP4, MNP3, MNP2, or NoEC appears. For either suffix type, if the modulation is V.34, /RX=xxxxx/TX=xxxxx is appended showing the VF rates in both directions.
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  • Page 175: Troubleshooting

    Overview Appendix B, Result Codes, points out basic problems that can occur when operating a 3800Plus modem. Use Tables C-1 through C-6 to check out these problems. If you are having data communication difficulties, such as Symptom Modem did not pass power-up self-test...
  • Page 176 COMSPHERE 3800Plus Modems Symptom Modem does not accept or echo back AT commands Symptom Modem does not receive a dial tone Modem does not go off-hook and answer an incoming call Table C-2 Modem – DTE Connection Action Verify that the cable between the Async port of the DTE and the modem is a standard RS-232 cable.
  • Page 177 Symptom Modem goes off-hook, answers, but does not connect Originate Mode Modem does not go off-hook and begin dialing Modem dials but does not connect Intermittent disconnects, high error rates, or excessive retransmissions Modem establishes and disconnects a call High error rates occur when running a local loopback or self-test 3980-A2-GB30-40 Table C-3...
  • Page 178 COMSPHERE 3800Plus Modems Symptom Data scrambled Missing data during a transfer Symptom Modems do not train-up on leased lines Modems are configured for dial backup, but do not switch to dial lines if leased lines fail Symptom Dial backup line is present, but cannot...

  • Page 179: Technical Specifications

    Technical Specifications Table D-1 shows the technical specifications for 3800Plus modems. Technical Specifications for COMSPHERE 3800 Plus Modems Specifications APPROVALS (110 Vac, 60 Hz only) FCC Part 15 FCC Part 68 3810 Plus (Model 3980) 3811 Plus (Model 3981) 3810 Plus (Model 3980)
  • Page 180 COMSPHERE 3800Plus Modems Technical Specifications for COMSPHERE 3800 Plus Modems Specifications COMPATIBILITY DATA RATES Dial Line Leased Line DTE RATES ERROR CONTROL DATA COMPRESSION ENVIRONMENT Operating Temperature Relative Humidity Shock and Vibration Storage Temperature Table D-1 (2 of 3) Criteria DIAL-LINE MODULATIONS ITU-T V.34 (33,600, 31,200, 28,800, 26,400, 24,000, 21,600, 19,200,...
  • Page 181 Technical Specifications for COMSPHERE 3800 Plus Modems Specifications AC POWER REQUIREMENTS 3810 Plus POWER CONSUMPTION 3810 Plus 3811 Plus HEAT DISSIPATION 3810 Plus 3811 Plus DIMENSIONS Weight Height Width Depth TRANSMIT LEVEL Dial Line Leased Line TELEPHONE INTERFACE Dial-Line Connectivity 3810 Plus 3811 Plus Leased-Line Connectivity...
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  • Page 183: Pin Assignments

    Pin Assignments Appendix E lists the pin assignments for EIA-232-D and VF TELCO interfaces, and shows the wiring diagram for an 8-position to 6-position cable. 3980-A2-GB30-40 October 1998...
  • Page 184 COMSPHERE 3800Plus Modems EIA-232-D Pin Assignments Table E-1 lists the EIA-232-D pin assignments for the modem. RS-232 Pin Name Circuit — +10V — –10V — — — CT112 — — — — — — CT141 CT140 CT111 XTXC TEST Table E-1...
  • Page 185 VF Connector Pin Assignments Table E-2 lists the connector pin assignments for 3810Plus modular jacks and the pin assignments for the TELCO jacks (Figure E-1). Leased Leased 4-Wire: TX 2-Wire: TX/RX 4-Wire: TX 2-Wire: TX/RX 4-Wire: RX 4-Wire: RX 3980-A2-GB30-40 Table E-2 VF Connector Pin Assignments Type of Telco Jack...

  • Page 186: Jm8 To Rj11 Crossover Cable

    COMSPHERE 3800Plus Modems JM8 to RJ11 Crossover Cable For 2-wire leased-line connections to a JM8 network interface, an 8-position to 6-position crossover cable (see Figure E-2) must be used according to the following FCC requirements: ‘‘The RJ series of jacks should not be used for connecting data equipment to nonswitched private line networks –...

  • Page 187: Itu-T V.25Bis Dialing Commands And Responses

    As commands are entered from the DTE, 3800Plus modems issue a response to the DTE which indicates if the call failed or connected, or if the command is valid or invalid.

  • Page 188: Call Response

    COMSPHERE 3800Plus Modems Call Response Call Failure Indication (CFI) The CFI response is issued to the DTE if the modem fails a CRN or CRS command. CFI is similar to the AT result codes BUSY, NO ANSWER, NO CARRIER, NO DIALTONE, and ERROR.

  • Page 189: Command Response

    The INV response format is: INVxx Where: xx is command unknown message syntax error parameter syntax error parameter value error Table F-1 lists V.25bis commands supported by 3800Plus modems. Table F-2 lists V.25bis response messages supported by 3800Plus modems. October 1998...
  • Page 190 COMSPHERE 3800Plus Modems V.25bis Command Call Request with Number Provided Call Request with Memory Address Incoming Call Indication Disregard Incoming Call Connect Incoming Call Program Normal Request to List Stored Number V.25bis Command Call Failure Indication Call Connecting Indication List Stored Number...

  • Page 191: Default Configuration Options

    Default Configuration Options Overview Table G-1 lists all default configuration options for the main four factory preset configurations. (Additional configuration options set by the optional Cellular (Mobile) Async Dial and UNIX Configuration Option DTE INTERFACE Async/Sync Mode Async Async DTE Rate 19,200 bps # Data Bits Parity Bit...
  • Page 192 COMSPHERE 3800Plus Modems Configuration Option DTE DIALER DTE Dialer Type AT Escape Character 043 ASCII Escape Guard Time 1sec Break Forces Escape Disable Command Character Echo Enable Carriage Return Character 013 ASCII Backspace Character 008 ASCII Linefeed Character 010 ASCII...
  • Page 193 Configuration Option DIAL LINE Modulation V.34 Dial Line Rate 33600(V34) Automode Enable Autorate Enable Dial Transmit Level Permissive – 9 dBm V.22bis Guard Tone Disable Train Time Long Asymmetric Rate Enable Fall Forward Delay Disable LEASED LINE Leased Mode Modulation Leased Line Rate Autorate Leased Transmit Level...
  • Page 194 COMSPHERE 3800Plus Modems Configuration Option V.42/MNP/BUFFER Error Control Mode V.42/MNP or Buffer V.42bis Compression Enable MNP5 Compression Enable EC Negotiate Buffer Disable EC Fallback Character Flow Control of DTE CTS to DTE Flow Control of Modem Disable XON/XOFF Passthrough Modem-to-Modem Flow...
  • Page 195 Configuration Option SECURITY Entry Wait Time 20 sec VF Prompt Type 2nd Dial Tone DTE Password Tries DTE Password Termination Character 013 ASCII Password Backspace Character 008 ASCII Answer Security Mode No_Answ_Sec Originate Security Mode No_OrigSec This configuration option is not changed by loading factory default configuration options. 3980-A2-GB30-40 Table G-1 (5 of 5)
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  • Page 197 Equipment Model 3810 Plus (110 v) Model 3811 Plus V.29 Feature V.33 Feature Expanded Security Feature (for 3811 Plus modems only) Synchronous Data Compression (SDC) Feature Enhanced Throughput Cellular (ETC) Feature User’s Guide 6-position, 4-wire modular cord, 7-foot length 8-position, 8-wire modular cord, 14-foot length 8-position to 6-position (JM8 to RJ11) crossover modular cable Power Supply (110 v) 3980-A2-GB30-40...
  • Page 198 COMSPHERE 3800Plus Modems This page intentionally left blank. October 1998 3980-A2-GB30-40...
  • Page 199 (address, control, and FCS fields) used by the DTE protocol. Flags opening and closing the HDLC frame serve as frame delimiters. A 3800Plus modem with the SDC feature supports DTE frame sizes up to 4300 bytes. This conforms to the X.25 recommendation which defines a maximum size of data packets as equal to 4096 bytes.
  • Page 200 COMSPHERE 3800Plus Modems When the transmit clock is provided by the DTE, the receive clock is set by the modem equal to the DTE clock. When SDC is in use, the Tx Clock Source configuration option cannot be set to Receiver Clock Loop.
  • Page 201 SDC Negotiation Configuration Scenarios Originating Modem SDC enabled with LAPM_Buffer negotiation. SDC enabled with LAPM_Discon negotiation. SDC enabled with LAPM_Buffer negotiation. SDC enabled with LAPM_Discon negotiation. SDC disabled. SDC disabled. * If during the negotiation phase, the modem with SDC enabled receives data from the remote modem indicating that it has SDC disabled, the link will not be established between the two modems.
  • Page 202 DTE frames) for positive acknowledgment. Modem Configuration There are also configuration options in the V42/MNP/Buffer branch of the 3800Plus modem which affect SDC efficiency. (LAPM) Max Frame Size. Except in environments where line impairments are known to be unusually high, set this to the maximum (256).
  • Page 203 Active (Operating) A configuration area containing configuration options currently in use by the modem. When a power cycle occurs, 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 204 COMSPHERE 3800Plus Modems autorate To adjust to varying VF line conditions by changing the data rate to a higher or lower rate after connection. The lowest rate the modem autorates to is 4800 bps; the highest possible rate depends on the modulation the modems connected with. In V.34, the modems may autorate asymmetrically.
  • Page 205 connector An outlet on equipment and cables that provides a connection. Central Processing Unit. The main or only computing device in a data processing system. Canadian Standards Association. Clear To Send. A signal indicating that the device is ready for the DTE to transmit data. Usually occurs in response to Request To Send (RTS).
  • Page 206 COMSPHERE 3800Plus Modems Data Terminal Ready. A signal from the DTE to the modem, sent via Pin 20 of the EIA-232 interface (V.24 circuit 108/1, /2), that indicates the DTE is turned ON and connected to the modem. edit area A temporary work area used to view and change configuration options from the DCP without impacting modem operation.
  • Page 207 ITU-T he Telecommunications Standardization Sector of the International Telecommunications Union, an advisory committee established by the United Nations to recommend communications standards and policies. Before March 1993 it was called CCITT. A jack used for leased-line networks. Pins 1 and 2 are the transmit pair and Pins 7 and 8 are the receive pair.
  • Page 208 COMSPHERE 3800Plus Modems online The state of a modem that is connected to and communicating with another modem. Originate mode The modem is in a state where it is ready to transmit a call. In a dial network, it is the modem that makes the call.
  • Page 209 SDCP Shared Diagnostic Control Panel. A feature that allows carrier-mounted devices to share the same diagnostic control panel. Shared Diagnostic Unit. A circuit card installed in Slot 0 of the COMSPHERE 3000 Series Carrier that provides an interface between an optional SDCP or network management system and the devices in the carrier.
  • Page 210 COMSPHERE 3800Plus Modems V.32bis An ITU-T standard for modems operating full-duplex with asynchronous or synchronous data over dial networks (PSTN) or leased lines at 14,400, 12,000, 9600, 7200, or 4800 bps. V.32terbo A modulation that adds the 19,200 bps and 16,800 bps data rates to the V.32bis data rates. It is a proprietary modulation, not an ITU-T standard.
  • Page 211 A/ (Repeat Last Command), 13-3 Abort (Test branch), 7-2 ac power connection, 2-4 requirements, D-3 Access from Remote, 8-44 Active (Operating) configuration area, 8-1 Active (Saved) configuration area, 8-1 Administrative Password, 11-4, 11-10 Answer, 5-3 Answer Access security, 11-2 Answer Access Security Mode, 8-47 Answer Security, 11-8 any–key abort, 5-2, 13-4, 13-5 Asymmetric Rate Mode...
  • Page 212 COMSPHERE 3800Plus Modems Backspace Character, 8-16 Bad Lines Auto Originate, 8-30 Bell Mode, 13-3 Blind Dial Pause, 8-19 Break Buffer Control, 8-38 Break Forces Escape, 8-15 Buffer Size in Buffer Mode, 8-40 Busy Tone Detect, 8-20 cables auxiliary, E-4 crossover, E-4 Call Answer commands (V.25bis), F-2...
  • Page 213 DTE Rate Async, 8-7 Sync, 8-8 DTE Rate=VF Rate, 8-13 DTE rates supported, D-2 DTE Remote Loopback, 8-41 DTE RL (CT140), 13-26 DTE status, 6-4 DTE-side password backspace character, 8-47 number of tries, 8-46 termination character, 8-46 DTR Action, 8-9 DTR Action (&D), 13-8 DTR Alarm Reporting, 8-45, 13-29 DTR Auto Redial, 8-23...
  • Page 214 COMSPHERE 3800Plus Modems messages, 4-7 MI/MIC Dialing, 8-23 MNP5 Compression, 8-36 models, 1-2 carrier-mounted, 3-1 standalone, 2-1 Modem-to-Modem Flow Control, 8-38 Modulation (Dial Line configuration option), 8-24 Modulation (Leased Line configuration option), 8-28 Modulation/Data Rate, %B, %BL commands, 13-15 modulations supported, D-2...
  • Page 215 S14 (Asymmetric Rate Mode), 13-20 S15 (Asymmetric Rate Mode), 13-20 S18 (Test Timeout), 8-41, 13-20 S23 (Proactive Retrain), 13-20 S26 (RTS/CTS Delay), 8-12, 13-20 S28 (SDC Negotiation), 13-21 S29 (SDC Idle Fill), 13-21 S31 (SDC Bit Encoding), 13-21 S32 (Sync DTE CRC), 13-22 S35 (Auto Redial), 13-22 S36 (Rate Auto Originate), 8-30, 13-22 S37 (Auto Redial), 8-23, 8-31...
  • Page 216 COMSPHERE 3800Plus Modems V.25bis response messages, F-3 V.29 Train On Data, 8-31, 13-32 V.42 ARQ WIndow Size, 13-31 V.42bis Compression, 8-36 V.54 Address, 8-42, 13-27 V.54 Device Type, 8-42, 13-27 VF line requirements, D-3 VF Prompt Type, 8-46 VF rate, 13-24 %B, %BL commands, 13-15 ITU–T/Bell Mode, 13-3...
  • Page 217 282600...

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