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Digicom COMSPHERE 3910 Installation And Operation Manual

3900 series point-to-point/multipoint modems
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3900 SERIES MODEMS
MODELS 3910 AND 3911
POINT-TO-POINT/MULTIPOINT
INSTALLATION AND OPERATION MANUAL
COMSPHERE
Document No. 3910-A2-GN32-41
Rurstraße 4
D-41564 Kaarst 1
Telefon (02131) 6 69 08-0
Telefax (02131) 66 71 48
Internet:
www.digicomm.de
e-mail: info@digicomm.de
February 2002

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  • Page 1 COMSPHERE 3900 SERIES MODEMS MODELS 3910 AND 3911 POINT-TO-POINT/MULTIPOINT INSTALLATION AND OPERATION MANUAL Document No. 3910-A2-GN32-41 February 2002 Rurstraße 4 D-41564 Kaarst 1 Telefon (02131) 6 69 08-0 Telefax (02131) 66 71 48 Internet: www.digicomm.de e-mail: info@digicomm.de...
  • Page 2 COMSPHERE 3900 Series Modems COMSPHERE 3900 Series Modems Models 3910 and 3911 Point-to-Point/Multipoint Installation and Operation Manual 3910-A2-GN32-41 6th Edition (February 2002) Changes and enhancements to the product and to the information herein will be documented and issued as a new release to this manual.

  • Page 3: Important Safety Instructions

    Safety Instructions Important Safety Instructions Read and follow all warning notices and instructions marked on the product or included in the manual. This product is intended to be used 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.
  • Page 4 COMSPHERE 3900 Series Modems Notices WARNING 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 5: Table Of Contents

    Table of Contents Preface Objectives and Reader Assumptions ......How to Use this Manual ........Related Documents .
  • Page 6 COMSPHERE 3900 Series Modems 3. DCP Operation Overview ..........Diagnostic Control Panels .
  • Page 7 Table of Contents 10. Call Setup Branch Overview ..........10-1 Dial .
  • Page 8 COMSPHERE 3900 Series Modems Appendices A. Menu Tree ......... Troubleshooting .
  • Page 9 Table of Contents List of Figures Figure Page Model 3910 ............Model 3911 .
  • Page 10 COMSPHERE 3900 Series Modems This page intentionally left blank. September 1998 3910-A2-GN32-40...
  • Page 11 Table of Contents List of Tables Table Page Technical Specifications for 391x Series Modems ......Model 3910 and Model 3911 DCP LEDs .
  • Page 12 COMSPHERE 3900 Series Modems Table Page V.25bis Commands ..........V.25bis Response Messages .

  • Page 13: Preface

    Preface Objectives and Reader Assumptions This manual describes how to install and operate the COMSPHEREr 391x Series standalone and carrier-mounted modems. This manual assumes that you have a basic understanding of modems and their operation. How to Use this Manual Chapter 1 provides technical specifications, information about the 391x Series modems’...

  • Page 14: Related Documents

    COMSPHERE 3900 Series Modems Appendix C provides EIA-232-D and VF TELCO pin assignments. Appendix D provides V.25bis dialing information. Appendix E provides an ASCII translation chart. Appendix F provides a list of all default configuration options available for the factory preset configurations.

  • Page 15: Introduction

    Introduction Overview The COMSPHERE 391x Series modems, a new generation of full-feature, high-speed modems, offer reliable asynchronous and synchronous operation over leased-line or dial networks. The 391x Series modems’ unique software defineability allows for the addition of future enhancements, whether it is installing new features or firmware upgrades. The modem’s compatibility with a number of dialing methods and protocols, such as asynchronous AT commands, ITU-T V.25bis dialing, and the user-friendly diagnostic control panel (DCP), permits the 391x Series modem to be used in a variety of applications and environments while also...

  • Page 16: Multipoint Applications

    COMSPHERE 3900 Series Modems Multipoint Applications In multipoint applications, leased-line circuits are used 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. Only one tributary can communicate with the control modem at a given time.

  • Page 17: Model 3910

    Introduction Standalone Model 3910 4-Wire/2-Wire Modem The standalone Model 3910 modem (Figure 1-1) is capable of either 4-wire/2-wire leased-line or dial operation. The modem is controlled using either AT commands or the diagnostic control panel (DCP). The DCP consists of a liquid crystal display (LCD), three function keys, four directional keys, and a row of 13 LED status indicators.

  • Page 18: Model 3911

    COMSPHERE 3900 Series Modems Carrier-Mounted Model 3911 4-Wire/2-Wire Modem The carrier-mounted Model 3911 modem (Figure 1-2) is capable of either 4-wire/2-wire leased-line or dial operation and installs into a COMSPHERE 3000 Series Carrier. The Model 3911’s faceplate has 16 LED status indicators for displaying modem activity and an audio speaker jack for the carrier’s optional speaker.

  • Page 19: Government Requirements And Equipment Return

    Introduction The Model 3911 derives ac power from the COMSPHERE 3000 Series Carrier’s backplane, which is a common bus to all devices installed in the carrier. The user interface to any Model 3911 is through the shared diagnostic control panel (SDCP), an optional feature which operates in a manner similar to the DCP on the Model 3910.
  • Page 20 COMSPHERE 3900 Series Modems 7. If you experience trouble with this equipment, please contact your sales or service representative (as appropriate) for repair or warranty information. If the product needs to be returned to the company service center for repair, contact them directly for return instructions using one of the following methods: Via the Internet: Visit the Paradyne World Wide Web site at http://www.paradyne.com Via Telephone: Call our automated call system to receive current information via fax or...
  • Page 21 Introduction Canada NOTICE TO THE 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 22: Technical Specifications

    COMSPHERE 3900 Series Modems Technical Specifications Table 1-1 shows the technical specifications for the 391x Series modems. Table 1-1 (1 of 3) Technical Specifications for 391x Series Modems Specifications Description APPROVALS FCC Part 15 Class A FCC Part 68 Registration Number: (See label on modem) Model 3910 Listed to UL 1950 COMSPHERE 3000 Series Carrier...
  • Page 23 Introduction Table 1-1 (2 of 3) Technical Specifications for 391x Series Modems Specifications Description ENVIRONMENT Operating Temperature 32 F (0 C) to 122 F (50 C) Relative Humidity 5% to 90% (noncondensing) Shock and Vibration Withstands normal shipping Storage Temperature –...
  • Page 24 COMSPHERE 3900 Series Modems Table 1-1 (3 of 3) Technical Specifications for 391x Series Modems Specifications Description DATA RATES Leased Line 19200, 16800, 14400, 12000, 9600, 7200, 4800, 2400 1200 bps Dial Line 19200, 16800, 14400, 12000, 9600, 7200, 4800, 2400, 1200, 600, 300 bps ERROR CONTROL ITU-T V.42...

  • Page 25: Modem Installation

    Modem Installation Overview This chapter provides a list of equipment supplied with the modem as well as a list of customer supplied equipment. In addition, it describes how to install and remove the 391x Series modem, and how to select a factory preset configuration using either the DCP or the AT command set. 391x Series Modem Package After opening the modem’s package, check for damage and verify that the following items are present:...

  • Page 26: Model 3910 Modem Installation

    COMSPHERE 3900 Series Modems Customer-Supplied Equipment The following customer-supplied equipment is required to complete a data communications system using the Model 3910 modem: A DTE with an available EIA-232-D serial port. A standard EIA-232-D cable with a DB-25-P (plug) connector at one end to attach to the modem.

  • Page 27: Model 3910 Rear Panel And Power Supply

    Modem Installation Connecting Cables to the Model 3910 Modems Figure 2-1 shows how Model 3910 modems are connected to certain TELCO jack types using the appropriate cables. For pin assignments, refer to Appendix C, Pin Assignments. DTE 2 DTE 3 DTE 4 LEASED DIAL DTE 1...

  • Page 28: Dte Connection

    COMSPHERE 3900 Series Modems DTE Connection Use the following procedures to connect the EIA-232-D cable from the modem to the DTE: 1. Make sure the modem’s rear panel power switch is OFF. 2. Connect the DB-25-P (plug) connector on the cable to the DB-25-S (socket) connector labeled DTE (Figure 2-1) on the modem’s rear panel.

  • Page 29: Network Management System Connection

    Modem Installation Network Management System Connection For the Model 3910, use the following procedures to connect the modem to the network management system interface: 1. Insert the sub-miniature, 4-conductor modular plug of the 3600 Hubbing Device into the jack labeled NMS (Figure 2-1). Refer to Document Number, 3610-A2-GZ45, 3600 Hubbing Device Feature Number 3600-F3-300, Installation Instructions, for a description of the 3600 Hubbing Device.

  • Page 30: Selecting Factory Configuration Options

    COMSPHERE 3900 Series Modems Selecting Factory Configuration Options After the modem passes the power-up self-test, configure it for operation using one of the six factory preset configurations. The 391x Series modems have six factory preset templates that contain the most commonly used configuration options (straps) for Synchronous Leased (Answer or Originate), Asynchronous Leased (Answer or Originate), Trellis Multipoint (Control or Tributary), Asynchronous Dial, Synchronous Dial, and UNIX Dial hardware network configurations.
  • Page 31 Modem Installation 6. Press the key until the appropriate configuration area appears on the LCD, then press the corresponding function key to select your choice. (Saving configuration options to the Active (Saved) configuration area automatically saves them to the Active (Operating) configuration area.) The LCD displays Command Complete.
  • Page 32 COMSPHERE 3900 Series Modems To change a factory template using AT commands, perform the following steps. For more information on changing factory templates using AT commands, refer to Chapter 14, AT Command Set and S-Registers. 1. Use the AT&F&W command to load the appropriate factory configuration to the appropriate storage area.

  • Page 33: Removing And Replacing Model 3910 Modems

    Modem Installation Removing and Replacing Model 3910 Modems To remove and replace a Model 3910 modem, perform the following steps: 1. Make sure the modem is offline, and press the modem’s rear panel power switch to the OFF position. 2. Disconnect the power cord from the ac power outlet, and then disconnect the dc power cable from the connector on the rear of the modem.

  • Page 34: Installing A Model 3911 Modem

    COMSPHERE 3900 Series Modems Figure 2-2. Installing a Model 3911 Modem 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 1–16 (Figure 2-2).

  • Page 35: Circuit Pack Lock

    Modem Installation 5. Press the key to place the SDCP in direct communication with the selected Select modem. The LCD displays the Top-Level menu for the selected modem. In addition, the Front Panel LED on the modem’s faceplate and the OK LED on the SDCP light. 6.

  • Page 36: Removing And Replacing Model 3911 Modems

    COMSPHERE 3900 Series Modems Removing and Replacing Model 3911 Modems CAUTION If the Model 3911 is removed from the carrier, always use a ground strap when handling the modem. Always store the Model 3911 in an antistatic bag when it is removed from the carrier.

  • Page 37: Dcp Operation

    DCP Operation Overview This chapter describes how to use the diagnostic control panel (DCP) of the 391x Series modem. It also describes how to select and use each branch of the Top-Level menu tree. Diagnostic Control Panels There are two types of diagnostic control panels (DCP), the DCP on the standalone Model 3910 modems and the shared diagnostic control panel (SDCP), an optional feature, used with the Model 3911 installed into a COMSPHERE 3000 Series Carrier.

  • Page 38: Model 3910 Dcp

    COMSPHERE 3900 Series Modems Model 3910 Diagnostic Control Panel The diagnostic control panel (DCP) of the Model 3910 modem (Figure 3-1) contains status indicators, pushbutton-type keys, an LCD, and speaker grill. ALRM DIAG TEST RATE DIAL COMSPHERE 3910 496-14174-01 Figure 3-1. Model 3910 DCP Model 3911 Faceplate and Shared Diagnostic Control Panel (SDCP) The shared diagnostic control panel (SDCP), Figure 3-2, is used to manage carrier-mounted Model 3911 modems.

  • Page 39: Status Indicators

    DCP Operation Status Indicators The 391x Series modems’ status indicators continuously provide information on the modem’s operating condition. All of the status indicators on the Model 3910 appear on the DCP (Figure 3-1), whereas the status indicators for the carrier-mounted Model 3911 are located on the Model 3911’s faceplate, the SDCP, and the SDU faceplate (Figure 3-2).
  • Page 40 COMSPHERE 3900 Series Modems The standalone Model 3910 modem’s DCP has 13 light-emitting diodes (LEDs), and the carrier-mounted Model 3911 has 16 LEDs. These LEDs are listed and described in Table 3-1. LEDs specific to one model type have the appropriate model number shown in the table. Table 3-1 Model 3910 and Model 3911 DCP LEDs Label...

  • Page 41: Diagnostic Control Panel Operation

    DCP Operation The SDCP LEDs are listed and described in Table 3-2. Table 3-2 SDCP LEDs Label Color Indicates green Power is ON and the modem is capable of operating. Alarm The modem has detected a problem with its operation. For example, the modem failed a self-test.
  • Page 42 COMSPHERE 3900 Series Modems LCD Display The LCD consists of a top line and bottom line, with each displaying a maximum of 16 characters at a time. If more information is available on the LCD than what is currently displayed, an indicator appears in the top right or bottom right-hand corner of the LCD. Use the key to scroll in the indicated direction to display more selections onto the LCD.
  • Page 43 DCP Operation Keypad The DCP on the Model 3910 has seven keys while the optional SDCP of the COMSPHERE 3000 Series Carrier has eight keys. The additional key on the carrier is the key, used to Select connect the SDCP to a specific slot in the carrier. key returns you to the Top-Level menu display from anywhere in the menu tree.

  • Page 44: Menu Structure

    COMSPHERE 3900 Series Modems Menu Structure The menu tree is a hierarchical structure used to display functions that configure and control local and remote 391x Series modems. It is accessed via the DCP and is shown in Appendix A, Menu Tree.
  • Page 45 DCP Operation Table 3-3 (1 of 3) Top-Level Menu Status Status Message Indicates Normal Leased:MR* The modem is operating on leased lines and transmitting at the Operation displayed data rate. Idle:MR* The modem is configured for dial network operation and is on-hook. OnLine:MR* The modem is online, in Data mode, and operating at the displayed EC**...
  • Page 46 COMSPHERE 3900 Series Modems Table 3-3 (2 of 3) Top-Level Menu Status Status Message Indicates Call Failure Busy Signal The answering modem is busy. Delayed As a result of failed call attempts, this number cannot be called at Number [ this time.
  • Page 47 DCP Operation Table 3-3 (3 of 3) Top-Level Menu Status Status Message Indicates Call Disconnect ATH Disconnect The modem has disconnected due to an ATH command. Bad Lines Disc The modem has disconnected because the lines do not support the modulation and/or data rate selected.
  • Page 48 COMSPHERE 3900 Series Modems 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. Table 3-4 Common Operational Messages Common Indicates Operational Message Please Wait... A command to a local device takes more than two seconds to complete.
  • Page 49 DCP Operation The Top-Level menu’s main branches appear on the LCD in the order of Status, Configure, PList, Control, Test, SubHS, Call Setup, Talk/Data, Security, and Remote. These branches are described in detail in Chapters 4 through 13. Quick Configuration Display The Quick Configuration display indicates the basic operational characteristics of the modem.
  • Page 50 COMSPHERE 3900 Series Modems The modem’s Quick Configuration information appears on the LCD’s bottom line. Displays the network position of the modem. The letter C indicates this is a control modem, and T indicates this is a tributary modem. Displays the network management address of the modem. The valid address field range is from 001 to 256.

  • Page 51: Status Branch

    Status Branch Overview 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. “Status” Configure PList Control...
  • Page 52 COMSPHERE 3900 Series Modems To access Status from the Top-Level menu, select Status. Leased:19.2 Status Configure 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: Status: >...
  • Page 53 Status Branch Table 4-1 (1 of 2) Health and Status Messages Type Message Indicates Major Device Failure A device/self test has failed. The probable cause is a modem hardware problem or diagnostic memory failure. Facility Fault A severe data transport problem is occurring due to poor line conditions.
  • Page 54 COMSPHERE 3900 Series Modems Table 4-1 (2 of 2) Health and Status Messages Type Message Indicates Dial Make Busy Mode The modem is in a Make Busy condition. Service Line (Model 3911 only) The modem installed in a COMSPHERE 3000 Series Carrier has been switched to a service line.
  • Page 55 Status Branch VF displays the condition of the leased or dial connection. To access VF from the Status branch, make the following selection: Status: > DeviceHS Select VF. Status:VF > SigQual=Excelent If the modem is receiving a signal, the signal quality appears on the LCD’s bottom line. Press the key to scroll and view the receive signal level, signal-to-noise ratio, near end echo level, far end echo level, far end echo delay, and echo frequency offset.
  • Page 56 COMSPHERE 3900 Series Modems NonLnearDist Non-Linear Distortion displays distortion which is usually associated with pulse-code modulation (PCM) compandor noise on the phone line. This value appears for Trellis Multipoint modulation. Retrains Retrains displays the number of retrains over the last 15 minutes of operation.
  • Page 57 Status Branch 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: Status: Identity Press the...
  • Page 58 COMSPHERE 3900 Series Modems To access Backup from the Status branch, make the following selection: Press the key until Backup appears. Status: Backup Select Backup. Status:Backup > Line=Pri 4w APL The configuration of the current operating line facility (either APL primary or backup) appears (Refer to Table 4-2).
  • Page 59 Status Branch Table 4-2 Backup Status Screens Active Line Inactive Line Possible Inactive/Backup Line Condition 1st Screen Display 2nd Screen Display Line=Pri 4w APL Bckup:2wAPL=XXXX Good indicates that line continuity is detected. Bad indicates that line continuity is not detected. Line=Pri 2w APL Bckup : Dial =(blank) ???? indicates that the line condition is unknown...
  • Page 60 COMSPHERE 3900 Series Modems 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: Status: Options Press the...
  • Page 61 Status Branch Press the key until Record appears. Select Record. Record Status Display Clear To display sequence faults, select Display. Record Number 1 Modem O.K. 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 key to view the remaining fields.
  • Page 62 COMSPHERE 3900 Series Modems This page intentionally left blank. 4-12 September 1998 3910-A2-GN32-40...

  • Page 63: Dcp Configuration

    DCP Configuration Overview After installing a 391x Series modem, its software configuration options must be set 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. The Configure branch accesses the Edit Area which is a work space where you view and change any configuration options (straps).

  • Page 64: Dial

    COMSPHERE 3900 Series Modems Figures 5-1 and 5-2 graphically display the interaction between the edit area and configuration areas as viewed from the perspective of the DCP and the AT command set. 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.

  • Page 65: At Command Configuration Process

    DCP Configuration Active (Saved) Customer1 Customer2 Factory (ATZ0, ATZ3) (ATZ1) (ATZ2) S Sync Dial S Sync (AT&F1) Leased S Sync Leased Answer (AT&F2) Originate S Async (AT&F4) S Async Leased Leased Answer Originate (AT&F5) (AT&F6) S TMp S TMp Trib Control (AT&F8) (AT&F7)

  • Page 66: Configure Branch

    COMSPHERE 3900 Series 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. “Status”...
  • Page 67 DCP Configuration 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 68 COMSPHERE 3900 Series Modems Ld Fact Preset: > Sync_Leased Select Sync_Leased. Choose Mode: Answer Originate Select Answer. Choose Function: Edit Save Select Edit. Edit StrapGroup: > DTE_Interface Edit StrapGroup Test Misc Scroll across the LCD and select the Misc configuration options group. September 1998 3910-A2-GN32-40...
  • Page 69 DCP Configuration StrapsWhenDisc > No_Change RemAccssPasswrd: "00000000 Select Nxt until RemAccssPasswrd appears. RemAccssPasswrd: "10000000 Select the F2 ( " ) key to increment password values. RemAccssPasswrd: "10000000 Press the key to move the cursor to the next position. RemAccssPasswrd: "12345678 Continue this sequence until you have entered the new password value.
  • Page 70 COMSPHERE 3900 Series Modems To save the new password to a configuration area, make the following selections: RemAccssPasswrd: "12345678 Press the key to scroll up (twice). Choose Function Edit Save Select Save. Sav EditArea to > Active(Saved) Select a configuration area (Active (Saved), Customer 1, or Customer 2) to save the changes. Select the key to exit to the Top-Level menu or select the key to remain in the Configure...

  • Page 71: Configuration Tables

    DCP Configuration Configuration Tables The modem’s configuration options are arranged into nine groups based on functionality: DTE Interface (Table 5-1), DTE Dialer (Table 5-2), Line Dialer (Table 5-3), Dial Line (Table 5-4), Leased Line (Table 5-5), V.42/MNP/Buffer (Table 5-6), Test (Table 5-7), Misc (Table 5-8), and Security (Chapter 12).
  • Page 72 COMSPHERE 3900 Series Modems Table 5-1 (1 of 10) DTE Interface Configuration Options Async/Sync Mode: Sync Nxt Sync Async Asynchronous/Synchronous Mode. Determines whether the modem operates in Asynchronous mode or Synchronous mode. If the AT command set is enabled and this configuration option is set to Sync, then the modem operates in Async mode when offline.
  • Page 73 DCP Configuration Table 5-1 (2 of 10) DTE Interface Configuration Options Asyn Parity Bit: None Nxt None Even Odd Mark Space This configuration option only appears if Async/Sync Mode is configured for Async. Asynchronous Parity Bit. Determines the type of asynchronous parity bit. The parity of the DTE must match the parity of the modem.
  • Page 74 COMSPHERE 3900 Series Modems Table 5-1 (3 of 10) DTE Interface Configuration Options DTR Action: Ignore Nxt Ignore Stndrd_RS232 CntrlsOnHook CntrlsTxMute Data Terminal Ready Action. DTR is a signal from the DTE to the modem indicating that the DTE is connected and ready for operation.
  • Page 75 DCP Configuration Table 5-1 (4 of 10) DTE Interface Configuration Options 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 76 COMSPHERE 3900 Series Modems Table 5-1 (5 of 10) DTE Interface Configuration Options RTS Action: Stndrd_RS232 Nxt Stndrd_RS232 Ignore Sim_Cntl_Car Cntl_Car Request-to-Send Action. RTS is a signal from the DTE indicating the DTE has data to send. H Standard RS232 Allows the DTE to control RTS to the modem in normal EIA-232-D operation.
  • Page 77 DCP Configuration Table 5-1 (6 of 10) DTE Interface Configuration Options CTS Control: Stndrd_RS232 Nxt Stndrd_RS232 Forced_On WinkWhenDisc Follows_DTR Follows_RTS40 Clear-to-Send Control. CTS is a signal from the modem to the DTE indicating that it can accept data from the DTE. H Standard RS232 In Synchronous mode, forces the state of CTS to follow the state of RTS in normal EIA-232-D operation.
  • Page 78 COMSPHERE 3900 Series Modems Table 5-1 (7 of 10) DTE Interface Configuration Options 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.
  • Page 79 DCP Configuration Table 5-1 (8 of 10) DTE Interface Configuration Options TX Clock Source: Internal Nxt Internal External RXC_Loop This configuration option only appears if Async/Sync Mode is configured for Sync. Transmit Clock Source. Determines the source of timing for synchronous data transmitted from the modem to the analog channel.
  • Page 80 COMSPHERE 3900 Series Modems Table 5-1 (9 of 10) DTE Interface Configuration Options CT111_Rate Cntl: Disable Nxt Disable Fallback1 Fallback2 CT111 Rate Control. 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. CT111 is also known as CH on the EIA-232-D interface.
  • Page 81 DCP Configuration Table 5-1 (10 of 10) DTE Interface Configuration Options Extend Main Ch.: Disable Nxt Disable Enable Primary data can only be extended one link. Extend Main Channel. This configuration option supports extended diagnostics. Specifies whether there is main (primary) channel connectivity between the modem’s DTE ports and the DTE ports of modems one level below (downstream) or above (upstream) in the diagnostic network.
  • Page 82 COMSPHERE 3900 Series Modems Table 5-2 (1 of 5) DTE Dialer Configuration Options DTE Dialer Type: Disable Nxt Disable AT V25bis_Async V25bis_Bsync V25bis_HDLC DTR=Direct1 AT&T_Exclusv Data Terminal Equipment Dialer Type. Identifies to the modem the type of dialing method and protocol used by the DTE.
  • Page 83 DCP Configuration Table 5-2 (2 of 5) DTE Dialer Configuration Options AT Escape Char: 043 ASCI Nxt " 043 ASCI This configuration option only appears if 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 AT Originate (ATO) command to return to Data mode.
  • Page 84 COMSPHERE 3900 Series Modems Table 5-2 (3 of 5) DTE Dialer Configuration Options CarriageRtn Char: 013 ASCI Nxt " 013 ASCI This configuration option only appears if DTE Dialer Type is configured for AT. Carriage Return Character. Allows you to change the ASCII character used to terminate an AT command to any ASCII value from 0 to 127.
  • Page 85 DCP Configuration Table 5-2 (4 of 5) DTE Dialer Configuration Options ExtendResltCode: Enable Nxt Enable Disable Add/EC Add/V42,MNP Use_DTE_Rate This configuration option only appears if DTE Dialer Type is configured for AT. Extended Result Codes. Informational messages such as VF data rate and Error Control are displayed with the result codes.
  • Page 86 COMSPHERE 3900 Series Modems Table 5-2 (5 of 5) DTE Dialer Configuration Options AT Cmnd Mode: Normal Nxt Normal No_ERROR NoStrapOrERR This configuration option only appears if DTE Dialer Type is configured for AT. AT Command Mode. Determines how the modem responds to valid and invalid AT commands. H Normal Allows normal operation of the AT command set.
  • Page 87 DCP Configuration Line Dialer The Line Dialer configuration options establish parameters used by the modem to answer or originate calls. Table 5-3 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 88 COMSPHERE 3900 Series Modems Table 5-3 (2 of 5) Line Dialer Configuration Options Blind Dial Pause: 2sec Nxt 2sec 4sec 6sec 8sec 10sec 20sec This configuration option only appears when Dial Tone Detect is configured for Disable. Blind Dial Pause. Determines how long the modem waits before dialing a telephone number when Dialtone Detect is disabled.
  • Page 89 DCP Configuration Table 5-3 (3 of 5) Line Dialer Configuration Options 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. H Disable The modem follows its normal disconnect sequence by issuing a cleardown sequence or long space disconnect.
  • Page 90 COMSPHERE 3900 Series Modems Table 5-3 (4 of 5) Line Dialer Configuration Options No Carrier Disc: 2sec Nxt 2sec Disable 5sec 10sec 20sec No Carrier Disconnect. If the modem no longer receives carrier from the remote modem, it disconnects the call.
  • Page 91 DCP Configuration Table 5-3 (5 of 5) Line Dialer Configuration Options MakeBusyVia DTR: Disable End Disable Enable Make Busy Via DTR. Determines if the modem goes off-hook when DTR is OFF. Enable this setting if the DTE normally keeps DTR ON and turns DTR OFF when the DTE cannot accept a call. NOTE: This configuration option should only be used when the modem is located behind a user’s Private Branch Exchange (PBX).
  • Page 92 COMSPHERE 3900 Series Modems Dial Line The Dial Line configuration options are used to configure the modem for operation over dial lines. Table 5-4 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 93 DCP Configuration Table 5-4 (2 of 3) Dial Line Configuration Options V32bis Automode: Enable Nxt Enable Disable System 85 This configuration option only appears when Dial Line Rate is configured for V.32 terbo, V.32bis, or V.32 data rate. V.32bis Automode. The modem automatically adapts to the modulation scheme and line rate of the remote modem.
  • Page 94 COMSPHERE 3900 Series Modems Table 5-4 (3 of 3) Dial Line Configuration Options 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 V.32bis Automode is configured for Enable. V.22bis Guard Tone.
  • Page 95 DCP Configuration Leased Line 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 5-5 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 96 COMSPHERE 3900 Series Modems Table 5-5 (2 of 6) Leased Line Configuration Options LeasedLine Rate: 19200(V32t) Nxt 19200(V32t) 16800(V32t) 14400(V32b) 12000(V32b) 9600(V32b) 7200(V32b) 4800(V32b) 19200(TMp) 14400(TMp) 9600(TMp) 7200(TMp) 4800(TMp) 2400(TMp) 2400(V22bis) 14400(V33) 12000(V33) 9600(V29) 7200(V29) 4800(V29) 4800(V27bis) 2400(V27bis) Leased-Line Rate. Determines the modem’s data rate and modulation scheme for operation on leased lines. NOTE: Certain changes to this configuration option will cause the modem to reset.
  • Page 97 DCP Configuration Table 5-5 (3 of 6) Leased Line Configuration Options V32bis Autorate: Enable Nxt Enable Disable This configuration option only appears when Leased Line Rate is configured for V.32 terbo or V.32bis data rate. V.32bis Autorate. Once connected, the modem automatically lowers the line rate if line conditions become impaired.
  • Page 98 COMSPHERE 3900 Series Modems Table 5-5 (4 of 6) Leased Line Configuration Options AutoDialStandby: Disable Nxt Disable 15min 1hr 4hr Test(2min) Adv 15min Adv 30min Adv 1 hr TestAdv2min This configuration option is not available if the LeaseLine Rate is configured for TMp and the NetworkPosition is configured for Control.
  • Page 99 DCP Configuration Table 5-5 (5 of 6) Leased Line Configuration Options V27bis Train: Short Nxt Short Long This configuration option is only available if Leased-Line Rate is configured for V27bis. V.27bis Train. Controls the train time for V.27bis operation. The AT command is S-Register S70=n, where n is 0 for Short and 1 for Long. V29 TrainOnData: Disable Nxt Disable Enable This configuration option is only available if Leased-Line Rate is configured for V29.
  • Page 100 COMSPHERE 3900 Series Modems Table 5-5 (6 of 6) Leased Line Configuration Options Lease_Lookback: Disable Nxt Disable Enable Lease Lookback. While operating on backup lines, this configuration option allows the modem to test the primary 4-wire leased lines for connectivity by detecting line energy across the normal line bandwidth. This test of the primary lines will not interrupt the data flow on the backup lines.
  • Page 101 DCP Configuration Table 5-6 (1 of 7) V.42/MNP/Buffer Configuration Options Err Contrl Mode: V42/MNPorBfr Nxt V42/MNPorBfr V42/MNPorDsc MNP_or_Buffr MNP_or_Disc BufferMode DirectMode LAPM_or_Disc LAPM_or_Bufr This configuration option is only available if Async/Sync Mode is configured for Async. Error Control Mode. Determines the type of error control used by the modem. In most cases, V42/MNPorBfr is the best choice.
  • Page 102 COMSPHERE 3900 Series Modems Table 5-6 (2 of 7) V.42/MNP/Buffer Configuration Options Err Contrl Mode (Continued) Nxt V42/MNPorBfr V42/MNPorDsc MNP_or_Buffr MNP_or_Disc BufferMode DirectMode LAPM_or_Disc LAPM_or_Bufr The AT command for Buffer Mode is \N0. The AT command for Direct Mode is \N1. The AT command for MNP or Disconnect is \N2.
  • Page 103 DCP Configuration Table 5-6 (3 of 7) V.42/MNP/Buffer Configuration Options EC Negotiat Bfr: Disable Nxt Disable Enable Disab&Switch This configuration option is only available if Async/Sync Mode is configured for Async, and Error Control Mode is configured for V42/MNPorBfr, MNP_or_Buffr, or LAPM_or_Bufr. Error Control Negotiate Buffer.
  • Page 104 COMSPHERE 3900 Series Modems Table 5-6 (4 of 7) V.42/MNP/Buffer Configuration Options Flw Cntl of DTE: CTS_to_DTE Nxt CTS_to_DTE Disable XON/XOFF This configuration option is only available if Async/Sync Mode is configured for Async, and Error Control Mode is not configured for DirectMode. Flow Control of DTE.
  • Page 105 DCP Configuration Table 5-6 (5 of 7) V.42/MNP/Buffer Configuration Options XON/XOFF Psthru: Disable Nxt Disable Enable This configuration option is only available if Async/Sync Mode is configured for Async, and Flow Control of Modem is configured for XON/XOFF. XON/XOFF Passthrough. Considers an XON/XOFF character as data and passes it on to the remote modem.
  • Page 106 COMSPHERE 3900 Series Modems Table 5-6 (6 of 7) V.42/MNP/Buffer Configuration Options Break Buffr Ctl: Keep_Data Nxt Keep_Data Discard_Data This configuration option is only available if Async/Sync Mode is configured for Async, and Error Control Mode is not configured for DirectMode. Break Buffer Control.
  • Page 107 DCP Configuration Table 5-6 (7 of 7) V.42/MNP/Buffer Configuration Options BuffrDiscDelay: 10sec Nxt 10sec Disable 60sec This configuration option is only available if Async/Sync Mode is configured for Async, and Error Control Mode is not configured for DirectMode. Buffer Disconnect Delay. Determines how long the modem continues to transmit data stored in its buffers when the modem is commanded to disconnect by a locally attached DTE.
  • Page 108 COMSPHERE 3900 Series Modems Test The Test configuration options determine specifics, such as the duration of a test, for the various diagnostic tests available to the modem. Table 5-7 shows each 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 109 DCP Configuration Table 5-7 (2 of 2) Test Configuration Options Test Timeout: Disable Nxt Disable 30sec 60sec 240sec Test Timeout. Determines how long a test runs before aborting. H Disable Allows a test to run indefinitely. H 30, 60, or 240 seconds Allows the test to run for 30 seconds, 60 seconds, or 240 seconds.
  • Page 110 COMSPHERE 3900 Series Modems Misc The Miscellaneous configuration options determine specifics for various functions, including network management parameters and remote modem access. Table 5-8 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 111 DCP Configuration Table 5-8 (2 of 4) Miscellaneous Configuration Options Speaker Volume: Medium Nxt Medium Low High Speaker Volume. Controls the level of speaker volume. 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 112 COMSPHERE 3900 Series Modems Table 5-8 (3 of 4) Miscellaneous Configuration Options NMS_Call_Msgs: CallCnct&Prg Nxt CallCnct&Prg Disable CallCnctOnly CallProgOnly NMS Call Messages. Determines if the modem status and/or call summary information is sent to the 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 113 DCP Configuration Table 5-8 (4 of 4) Miscellaneous Configuration Options Diag Connection: Modem(DC) Nxt Modem(DC) NMS(CC) Disable This configuration option is not available if the LeaseLine Rate is configured for TMp and the NetworkPosition is configured for Tributary. 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).
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  • Page 115: Poll List Branch

    Poll List Branch Overview The Poll List function is not available on Point-to-Point control modems or Multipoint Tributary 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. The maximum number of devices is 16 on the secondary channel and 64 on the diagnostic channel.
  • Page 116 COMSPHERE 3900 Series Modems To access PList from the Top-Level menu, make the following selections: Leased:19.2 PList Control Press the key until PList appears. Select PList. 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.
  • Page 117 Poll List Branch If there are modems in the poll list when you select Display, Displays the network management address of the modem in the poll list. yyyyyy Displays either Active or Skip to indicate the poll list in which the network management address is included.
  • Page 118 COMSPHERE 3900 Series Modems Press the key until Change appears. Select Change. 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. Poll List:Chang >...
  • Page 119 Poll List Branch 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: Poll List: Change...
  • Page 120 COMSPHERE 3900 Series Modems Press the key until Acquire appears. Select Acquire. NOTE 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 121: Control Branch

    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. “Status” Status Configure PList SubHS Call_Setup Tlk/Data Security Remote Test Control (3910 (3911 only) only)

  • Page 122: Speaker

    COMSPHERE 3900 Series Modems To access Control from the Top-Level menu, make the following selections: Leased:19.2 Control Test Press the key until Control appears. Select Control. Speaker Speaker allows you to make temporary adjustments to the modem’s speaker volume. Upon a reset, speaker volume returns to its configured setting.

  • Page 123: Reset

    Control Branch 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 124: Eia Leds

    COMSPHERE 3900 Series Modems If you want to disable the modem’s data stream, press the F2 key. When the message Command Complete appears, press the key to clear the message. Data Stream Port1 Enable Press the F2 key again to enable the modem’s data stream. To exit this function and remain in the Control branch, press the key.

  • Page 125: Make Busy/Remove Make Busy

    Control Branch After selecting the desired interface, the message Command Complete appears on the bottom line of the LCD and the selected interface appears in the xxxxx field. To exit this function and remain in the Control branch, press the key.

  • Page 126: Service Line/Disconnect Service Line

    COMSPHERE 3900 Series Modems To remove the modem from Make Busy mode, press the key once and the key until RemoveMakeBusy appears. Control: RemoveMakeBusy Press any function key to select RemoveMakeBusy. The message Command Complete appears on the LCD. Service Line/Disconnect Service Line The Service Line function allows you to switch a specific Model 3911 installed in a COMSPHERE 3000 Series Carrier from normal leased or dial operation to service-line operation.

  • Page 127: Download Software

    Control Branch Download Software The Download Software function sets parameters within the modem when transferring firmware to one or more modems or when receiving firmware upgrades from a locally attached PC-based controller. The latter is only performed by customer service personnel. There are two selections under Download Software: Clone Remote and To Local via DTE.
  • Page 128 COMSPHERE 3900 Series Modems Clone Remote in Point-to-Point Configurations Before using Clone Remote in point-to-point configurations, perform the following: Make sure the 391x Series modems have an established leased-line connection using either V.33, V.32terbo, V.32bis, V.32, or V.29 modulation (refer to the Leased Line section in Chapter 4) or a dial network connection using either V.32terbo, V.32bis or V.32 modulation (refer to Dial Line in Chapter 5, DCP Configuration).
  • Page 129 Control Branch From the Choose DLL Type screen, press the key until DC_Broadcast appears. Press F1 or F2 to transfer an exact copy of the tributary modem’s firmware to the DC-connected control modem(s) using the Active Poll list. Proceed to Implementing a Clone Remote Operation on page 7-12, which follows the descriptions of multipoint cloning operations.
  • Page 130 COMSPHERE 3900 Series Modems For Single download configurations, know the remote access password and the network management address of the remote tributary modem that will receive the download. Refer to the Misc section in Chapter 4 for a description of the remote access password (RemAccssPasswrd) configuration option and the network management address (NetMngmtAddress) configuration option.
  • Page 131 Control Branch After completing these actions, proceed to Implementing a Clone Remote Operation on page 7-12. Cloning a Multiple TMp Remote Choose DLL Type > Single Multiple Press the F3 key to select Multiple Clone Remote. After completing this action, proceed to Implementing a Clone Remote Operation on page 7-12. Viewing Multiple TMp Clone Results Choose DLL Type >...
  • Page 132 COMSPHERE 3900 Series Modems Implementing a Clone Remote Operation WARNING The modem begins a transfer of its own program to the remote modem. This process takes the communication link out-of-service for several minutes 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 133: Vf Thresholds Update

    Control Branch Access Disabled The remote modem’s Access from Remote configuration is disabled. Password Invalid The local and remote modems’ passwords do not match. Correct the problem and attempt another download from the local modem. If this fails, contact your service representative. No Circuit There is no connection between the local and remote modem.
  • Page 134 COMSPHERE 3900 Series Modems Press the key until VF_Thresh_Update appears. Press any function key to select VF_Thresh_Update. VF Thresholds Edit Save Reset Select Edit. In the following example, the RSL High threshold is changed from 09 (– dBm) to 10. This example demonstrates VF threshold editing and saving.
  • Page 135 Control Branch Press the key to move the cursor to the next position ( 9 ). Select the F2 ( " ) key to change the number above the cursor ( 9 ) to 0. RSL High (- dBm) " 10 NOTE If you want to modify additional VF thresholds, select Nxt.
  • Page 136 COMSPHERE 3900 Series Modems To correct the invalid VF threshold, press the key to return to the VF Threshold Edit/Save/Reset screen. VF Thresholds Edit Save Reset Select Reset to restore the original default values into memory. Repeat the Edit and Save procedure until the VF threshold(s) is valid and the Save completes successfully (Save Completed).

  • Page 137: Test Branch

    Test Branch 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 138: Abort

    COMSPHERE 3900 Series Modems To access the Test branch from the Top-Level menu, make the following selections: Leased:19.2 Control 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 139: Self

    Test Branch 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. WARNING When this test is run in Remote mode, it will cause the Remote mode session to be lost.

  • Page 140: Loc Analog Loop

    COMSPHERE 3900 Series 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 141: Rem Digital Loop

    Test Branch The message Started appears on the LCD, and the Test LED lights for the duration of the test. If Invalid Command appears on the LCD, another test is in progress. Select Abort to clear the current test and try again. If the Test Timeout configuration option is enabled, Test Timeout appears at the conclusion of the test.

  • Page 142: Loc Digital Loop

    COMSPHERE 3900 Series Modems Press the key until Rem_Digital_Loop appears. Press any function key to start this test. Test:Remote Loop Started The message Started appears on the LCD, and the Test LED lights for the duration of the test. If Invalid Command appears on the LCD, another test is in progress.

  • Page 143: Pattern

    Test Branch Test: Loc_Digital_Loop Press the key until Loc_Digital_Loop appears. Press any function key to start this test. Test:Digitl Loop Started The message Started appears on the LCD and the Test LED lights. If Invalid Command appears on the LCD, another test is in progress. Select Abort to clear the current test and try again.

  • Page 144: Pattern Test And Digital Loopback Test

    COMSPHERE 3900 Series Modems Figure 8-5. Pattern Test and Digital Loopback Test Figure 8-6. End-to-End Pattern Test 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 >...
  • Page 145 Test Branch BlksErrd=xxxxxxx displays the number of blocks of data found in error (block size is 1000 bits per block). BlksRcvd=xxxxxxx displays the total number of blocks of data received. The message NoSync appears as a value for BlksErrd while the modem’s receiver is synchronizing. The message OvrFlw appears as the value for BlksErrd if the counter overflows.
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  • Page 147: Sub-Network Health And Status Branch

    Sub-Network Health and Status Branch Overview 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 148 COMSPHERE 3900 Series Modems Press the key until SubHS appears. Select SubHS. NOTE If there are no modems in the multipoint poll list, the message Poll List Empty! appears on the second line of the LCD. Sub-network HS yyyyyy When you select SubHS, Displays the network management address of the downstream modem selected.

  • Page 149: Call Setup Branch

    Call Setup Branch Overview 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 150: Dial

    COMSPHERE 3900 Series Modems To access the Call Setup branch from the Top-Level menu, make the following selections: Leased:19.2 Call_Setup Press the key until Call_Setup appears. Select Call_Setup. Dial For dial backup applications, Dial allows you to dial any telephone number stored in directory locations 1–24.

  • Page 151: Disconnect

    Call Setup Branch Once the directory location you want appears on the LCD, press the F2 or F3 key to dial the number. DialDirectory:01 Off Hook The Call Setup status Off Hook appears during the connection process. If the connection is successful, one of the Normal Operation status messages (Table 3-3 in Chapter 3, DCP Operation) appears on the LCD.

  • Page 152: Answer

    COMSPHERE 3900 Series Modems 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 Line Dialer in Chapter 5, DCP Configuration.) For leased backup applications, Answer allows the modem to begin the handshaking process with the remote modem.

  • Page 153: Dial Standby/Return To Dial

    Call Setup Branch Dial Standby/Return to Dial When the modem is operating in Dial Backup mode (DialBckUp), Dial Standby and Return to Dial allow the modem to switch back and forth between primary leased-line and primary leased-line backup operation while still maintaining the backup connection (Figure 10-1). Switching between backup and primary leased-line operation can be performed manually or automatically.

  • Page 154: Change Directory

    COMSPHERE 3900 Series Modems To access Dial Standby or Return to Dial from the Call Setup branch, make the following selections: Call Setup: Dial Standby Press the key until Dial Standby or Return_to_Dial appears. Select the appropriate function. Dial Standby Command Complete 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.
  • Page 155 Call Setup Branch Press the key until Change_Directory appears. Press any function key to select Change_Directory. 01:551234z " The phone number listed in directory location 1 appears. Select Nxt to display other directory locations. 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.
  • Page 156 COMSPHERE 3900 Series Modems To save the number just entered, scroll to the next directory location by selecting Nxt. The number is now stored in nonvolatile memory. Table 10-1 describes what can be entered in directory locations. Table 10-1 Valid Dial Command Modifiers Dial command modifiers are parameters entered in the dial command string which specify how, when, and what number to dial.

  • Page 157: Directory Status (Does Not Appear In North America)

    Call Setup Branch Directory Status (Does Not Appear in North America) Directory Status displays the status of each directory location. To access Directory Status from the Call Setup branch, make the following selections: Call Setup: < Directory_Status Press the key until Directory_Status appears. Press any function key to select Directory_Status.
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  • Page 159: Talk/Data Branch

    Talk/Data Branch Overview 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 160: Manual Dialing When The Remote Modem Is Configured For Auto-Answer

    COMSPHERE 3900 Series Modems Manual Dialing When the Remote Modem is Configured for Auto-Answer NOTE On the remote modem, the Line Current Disconnect configuration option (refer to Line Dialer in Chapter 5, DCP Configuration) must be set to Disable. This configuration option does not appear on Models 3910-A1-401 and 3911-B1-001.

  • Page 161: Manual Dialing When The Remote Modem Is Configured For Manual Answer

    Talk/Data Branch Manual Dialing When the Remote Modem is Configured for Manual Answer NOTE On both modems, the Line Current Disconnect configuration option (refer to Line Dialer in Chapter 5, DCP Configuration) must be set to Disable This configuration option does not appear on Models 3910-A1-401 and 3911-B1-001.
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  • Page 163: Dial Access Security

    Dial Access Security Overview NOTE This chapter supports the operation of dial access security for the COMSPHERE 391x Series modems. This chapter is self supporting and can be removed to prevent unwanted knowledge of dial access security operation. Although the security functions described in this chapter are designed to prevent unwanted user access to your network, the company recognizes that no security system is infallible.
  • Page 164 COMSPHERE 3900 Series 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. If the password is valid, the user can dial out using this modem.
  • Page 165 Dial Access Security The following examples illustrate two ways to enter a VF-side password: ATDP5551234TW12345678# or ATDT5551234@12345678# Where: ATD is the AT dial command. P and T are the Pulse dial and Tone (DTMF) dial modifiers. 5551234 is the phone number. W or @ is the VF Prompt Tone option setting for second dial tone or quiet answer.

  • Page 166: Security Branch

    COMSPHERE 3900 Series Modems Combination of VF-Side and DTE-Side Passwords The previously described methods of password entry can be combined to provide two layers of security. In this case, the modems negotiate VF-side password entry prior to training. If successful, the modems connect and then prompt the originating user for a valid password.
  • Page 167 Dial Access Security 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 168 COMSPHERE 3900 Series Modems Press the key to scroll the Set Answer Security, Set Originate Security, and Set Administrative Password groups into view. If an incorrect administrative password is entered, then the message PassWrd Invalid appears as well as the last password entered. Enter the correct password value or press the key to exit the Security branch.
  • Page 169 Dial Access Security 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 select Ent. If an index outside of the range is entered, the message Index Too Big appears.
  • Page 170 COMSPHERE 3900 Series Modems Table 12-1 (2 of 2) Edit Password Table Group Options H VF plus DTE Indicates that both layers of password entry are used with this index’s password. This location is configured so that the answering modem sends a prompt for the DTE-side password after receiving a valid VF-side password.
  • Page 171 Dial Access Security 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 172 COMSPHERE 3900 Series Modems 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: Set Access Ctrl Set_Orig_Sec...
  • Page 173 Dial Access Security 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 only way to access any of the security functions is by selecting Reset Security.
  • Page 174 COMSPHERE 3900 Series Modems 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 175: Security Configuration Options

    Dial Access Security Security Configuration Options The Security Configuration Options group allows you to view and set dial access security parameters. This group is located in the Configuration branch of the Top-Level menu. Table 12-4 shows each Security configuration option as it appears on the LCD. The factory default value is shown after the colon ( : ) on the first line;...
  • Page 176 COMSPHERE 3900 Series Modems Table 12-4 (2 of 3) Security Configuration Options 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 from 0 to 127.
  • Page 177 Dial Access Security Table 12-4 (3 of 3) Security Configuration Options H VF & DTE The answering modem is enabled for security. The modems negotiate security using the VF-side password entry technique protocol. If successful, and the Password Type for this particular VF password is set for VF_&_DTE, a password is requested from the originating user.

  • Page 178: Security Password Entry Techniques

    COMSPHERE 3900 Series Modems Security Password Entry Techniques The previous sections described how to set up and configure your network for dial access security. Once configured and enabled, you must now supply a password to originate or answer a call. The following examples demonstrate how to enter an Answer Access security password string and an Originate Access password string.
  • Page 179 Dial Access Security Originate Access Password An Originate Access password is entered by a local user to gain access to a local 391x Series modem. This password is embedded in the AT dial command and cannot be entered from the diagnostic control panel (DCP).

  • Page 180: Database Table Examples

    COMSPHERE 3900 Series 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 181 Dial Access Security Table 12-7 is an example of a security database table that uses a mixture of VF and DTE passwords. Table 12-7 Security Database Table Using Both VF-Side and DTE-Side Passwords VF and DTE Passwords Index Password Type Assigned to VF_Entry Denver office*...
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  • Page 183 Dial Access Security NOTE This page is self-supporting and can be removed for security reasons. 00282600 Dial Access Security To clear the dial access security alarm light from the modem’s front panel, do the following: 3. Press the key to return to the Top-Level menu. 4.
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  • Page 185: Remote Branch

    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 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 186 COMSPHERE 3900 Series 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. In point-to-point networks, the Remote Access Password configuration option must be the same for both the local and remote modems.
  • Page 187 Remote Branch 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. Choose Address: "xxx The address field (xxx) displays the network management address of the modem to be accessed by the Remote function.
  • Page 188 COMSPHERE 3900 Series Modems If operation over the secondary channel is desired, press any function key to select the secondary channel. Secondary channel only appears if using V.32terbo, V.32bis, V.32 or TMp modulation. If operation over the primary channel is desired, press the key until primary displays and press any function key.
  • Page 189 Remote Branch If a connection is established but the wrong password is stored, the status message Password Invalid appears on the LCD. This configuration option must be enabled by the remote user. (Refer to the Remote Access Password configuration option in Table 5-8 of Chapter 5, DCP Configuration.) The Remote mode command displays Other Test Active if an Analog Loopback test is currently running.
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  • Page 191: At Command Set And S-Registers

    AT Command Set and S-Registers Overview The AT command set provides an alternative method to the modem’s DCP for entering commands that control the operation and configuration of the 391x Series modems. This chapter discusses guidelines necessary to operate AT commands as well as listing the modifiers for all AT commands supported by the 391x Series modems.

  • Page 192: Command Guidelines

    COMSPHERE 3900 Series Modems Use the O command to return to Data mode from online Command mode. Enter the following command: TYPE: PRESS: Enter Command Guidelines Review the following guidelines before using any AT Commands. The escape sequence ( + + + ) is used to enter online Command mode from Data mode. The asynchronous character format for the AT command set must be one of the following: —...
  • Page 193 AT Command Set and S-Registers Result Codes Table 14-1 lists all valid result codes for the 391x Series modem. Table 14-1 (1 of 2) Result Codes Numbers Numbers Word Description Command executed CONNECT Modem connected to line RING Modem receiving a ring voltage from the VF line NO CARRIER Modem lost carrier signal, does not detect carrier signal, or does not detect answer tone...

  • Page 194: At Command List

    COMSPHERE 3900 Series Modems Table 14-1 (2 of 2) Result Codes Numbers Numbers Word Description CONNECT 38400** Connection at 38,400 bps CONNECT 19200/ EC** Connection at 19,200 bps with error control CONNECT 57600** Connection at 57,600 bps FORBIDDEN Forbidden number DELAYED Delayed number * Only appears when the Extended Result Codes configuration option is enabled.
  • Page 195 AT Command Set and S-Registers Table 14-2 (1 of 10) 391x Series AT Commands DCP LCD Description Command Command Sequence Repeat Last Command. Reexecutes last command string. (Not to be Call Setup\ preceded with AT or followed by pressing the Return key.) Answer Answer Mode.
  • Page 196 COMSPHERE 3900 Series Modems Table 14-2 (2 of 10) 391x Series AT Commands DCP LCD Description Command Command Sequence Dn (cont.) — Quiet answer. Wait for five seconds of silence after dialing the number. If the silence is not detected, the modem sends either a NO ANSWER result to the DTE.
  • Page 197 AT Command Set and S-Registers Table 14-2 (3 of 10) 391x Series AT Commands DCP LCD Description Command Command Sequence Return to Online or Data Mode. Returns modem to Data mode from None Online Command mode. Pulse Dial. Sets the modem for Pulse Dial mode. Configure\Edit\ Line Dialer NOTE: Pulse Mode is disabled in Denmark and Sweden.
  • Page 198 COMSPHERE 3900 Series Modems Table 14-2 (4 of 10) 391x Series AT Commands DCP LCD Description Command Command Sequence Extended Result Code, Dial Tone Detect, and Busy Tone Detect Extended Configuration Options. Result Code: Configure\Edit\ Extended Dial Tone Busy Tone DTE Dialer Result Code: Detect:...

  • Page 199: Dial Backup

    AT Command Set and S-Registers Table 14-2 (5 of 10) 391x Series AT Commands DCP LCD Description Command Command Sequence Reset and Load Active. Control\Reset Loads configuration options from Active (Saved) to Active (Operating). Loads configuration options from Customer 1 to Active (Operating).
  • Page 200 COMSPHERE 3900 Series Modems Table 14-2 (6 of 10) 391x Series AT Commands DCP LCD Description Command Command Sequence &Fn Select Factory Default Configuration Options. Loads factory configuration Configure/ options into Active (Operating) area. Factory &F0 Async Dial &F1 Sync Dial &F2 Sync Leased: Answer &F3...
  • Page 201 AT Command Set and S-Registers Table 14-2 (7 of 10) 391x Series AT Commands DCP LCD Description Command Command Sequence &Mn and Async/Sync Mode and DTE Dialer Type. Configure\Edit\ &Qn DTE Dialer &M0, &Q0 Modem operates in Asynchronous mode and uses AT Command protocol.
  • Page 202 COMSPHERE 3900 Series Modems Table 14-2 (8 of 10) 391x Series AT Commands DCP LCD Description Command Command Sequence &Vn View Configuration Options. Displays each configuration group within the None Active (Operating), Active (Saved), Customer 1, and Customer 2 configuration areas as well as the telephone numbers stores in directory locations 1–24.
  • Page 203 AT Command Set and S-Registers Table 14-2 (9 of 10) 391x Series AT Commands DCP LCD Description Command Command Sequence CTS Control. Configure\Edit\ DTE Interface 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 204: S-Register List

    COMSPHERE 3900 Series Modems Table 14-2 (10 of 10) 391x Series AT Commands DCP LCD Description Command Command Sequence No Data Disconnect Timer. Configure\Edit\ Line Dialer Disable. Where n is a value from 1 to 255 in 1-minute increments. NOTE: The factory default value is country dependent. XON/XOFF Passthrough Flow Control.
  • Page 205 AT Command Set and S-Registers S-Register Format S-Registers can be displayed and/or modified when the modem is in Command mode. To display the value of an S-Register, issue the following command: TYPE: ATSn? Where: n is the register number. PRESS: Enter To modify the value of an S-Register, issue the following command: TYPE:...
  • Page 206 COMSPHERE 3900 Series Modems Table 14-3 (2 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence Backspace Character. Register determines ASCII value used as the Configure\Edit\ backspace (Backspace key). This character moves the cursor to the DTE Dialer left and erases the previous character.
  • Page 207 AT Command Set and S-Registers Table 14-3 (3 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence Auto Make Busy. Register determines if the modem goes off-hook Configure\Edit\ under certain conditions. This register should only be enabled when Line Dialer the modem is located behind a user’s Private Branch Exchange (PBX).
  • Page 208 COMSPHERE 3900 Series Modems Table 14-3 (4 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence Leased-Line Rate. Register determines the modem’s data rate and Configure\Edit\ modulation scheme for operation on either 2-wire or 4-wire leased Leased Line lines in either Answer or Originate mode.
  • Page 209 AT Command Set and S-Registers Table 14-3 (5 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence Auto Dial Standby. Register determines if the modem performs an Configure\Edit\ automatic dial standby if in Dial Backup mode. Leased Line Register has the following values: 0 = Disable 1 = 15 minutes...
  • Page 210 COMSPHERE 3900 Series Modems Table 14-3 (6 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence V.54 Address. Identifies the address of the modem to be placed in a Configure\Edit\ loopback test. Tests Register has the following values: 0 = Disable 1–34 = Modem address The factory setting is Disable.
  • Page 211 AT Command Set and S-Registers Table 14-3 (7 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence CT111 Rate Control. Register determines if CT111 Rate is disabled, Configure\Edit\ set for Fallback 1 or Fallback 2. DTE Interface CT111 Rate allows the DTE to control modem rate via Pin 23 of the EIA-232-D interface.
  • Page 212 COMSPHERE 3900 Series Modems Table 14-3 (8 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence NMS Call Messages. Register determines if the modem sends Configure\Edit\ information regarding status (Call Progress) and/or sends summarized Misc call statistics (Call Connect) to the 6700 Series Network Management System (NMS).
  • Page 213 AT Command Set and S-Registers Table 14-3 (9 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence RTS Antistreaming. Register determines the antistreaming operation Configure\Edit\ of the modem. DTE Interface Register has the following values: 0 = Disable 1 = 10 sec 2 = 30 sec 3 = 1 min...
  • Page 214 COMSPHERE 3900 Series Modems Table 14-3 (10 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence V.32bis Autorate (Leased Line). Register determines if Autorating is Configure\Edit\ used on leased lines when connected in V.32bis mode. Leased Line Register has the following values: 0 = Enable 1 = Disable The factory setting is Enable.
  • Page 215 AT Command Set and S-Registers Table 14-3 (11 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence V.42 Automatic Request for Retransmission (ARQ) Window Size Increase. Register allows the ARQ window size to be set to a value from six frames to fifteen frames.
  • Page 216 COMSPHERE 3900 Series Modems Table 14-3 (12 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence V.29 Retrain. When enabled, the modem transmits a training Configure\Edit\ sequence whenever it receives one. This configuration option should Leased normally be disabled for control modems. Register has the following values: 0 = Enable 1 = Disable...
  • Page 217 AT Command Set and S-Registers Table 14-3 (13 of 13) 391x Series S-Registers DCP LCD S-Register Description Command Sequence Reduced Asynchronous Buffer Size. Register limits the modem’s Configure\Edit\ buffer size to a maximum of 20 characters. V42/MNP/Buffer Register has the following values: 0 = Disable 1 = Enable The factory setting is Disable.
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  • Page 219: Menu Tree

    Menu Tree Overview Pages A-2 and A-3 provide a menu tree for the 391x Series modems. 3910-A2-GN32-40 September 1998...
  • Page 220 COMSPHERE 3900 Series Modems Displays current status of modem along with "Status" data rate and error control mode. to next page Status Configure PList Ld EditArea frm: (Tributary only) Activ Customer2 Display Clear Change Add Acquire (Operating) Customer1 Factory Active Active Delete (Saved)
  • Page 221 Menu Tree from previous page Control SubHS Tlk/Data Remote Test Call_Setup Security (Dial Choose Address Backup (TMP Control only) only) Dial Answer Change_Directory Choose Password (TMP only) Directory_Status Disconnect Dial_Standby (Does not appear (Not in TMp Trib) in North America) Return_to_Dial Directory Locations 1 –...
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  • Page 223 Troubleshooting Overview This appendix points out basic problems that can occur when operating a 391x Series modem. Use Tables B-1 through B-6 to check out these problems. If you are having data communication difficulties, such as periodic character loss, random errors, or constant format errors, use the loopback tests described in Chapter 8, Test Branch.
  • Page 224 COMSPHERE 3900 Series Modems Table B-2 Leased-Line Operation Symptom Action The modems do not train-up on Verify that the correct cabling is used for your application. Refer to leased lines. Chapter 2, Modem Installation. Verify that one modem is configured for Answer mode and the other is configured for Originate mode.
  • Page 225 Troubleshooting Table B-4 Modem — DTE Connection Symptom Action The modem does not accept or Verify that the cable between the Async port of the DTE and the echo back AT commands. 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 226 COMSPHERE 3900 Series Modems Table B-5 (1 of 2) Modem — VF Connection Symptom Action The modem does not receive a Attach a telephone directly to the telephone line to verify that a dial dial tone. tone exists. Make sure the VF line is connected to the modem’s rear jack labeled DIAL.
  • Page 227 Troubleshooting Table B-5 (2 of 2) Modem — VF Connection Symptom Action The modem does not go off-hook If using AT Dialing, refer to Table B-4, Modem—DTE Connection. and begin dialing. If using DTR Dialing, verify the telephone number stored in directory location 1, and verify that the DTE is raising DTR from Off to ON to initiate a dial.
  • Page 228 COMSPHERE 3900 Series Modems Table B-6 Online Operation Symptom Action The data is scrambled. Verify that the character format (data bits, parity, and stop bits) is set to the same value in both modems. Data is missing during a transfer. Verify that you are using the same method of flow control for both the modem and the DTE.
  • Page 229 Pin Assignments Overview This appendix lists EIA-232-D and VF TELCO pin assignments and provides information about auxiliary cables which are not supplied. 3910-A2-GN32-40 September 1998...
  • Page 230 COMSPHERE 3900 Series Modems EIA-232-D Pin Assignments Table C-1 lists the EIA-232-D pin assignments for the modem. Table C-1 EIA-232-D Pin Assignments Signal Name CCITT Circuit Function Circuit Source — — Shield Transmit Data Receive Data Request-to-Send Clear-to-Send Data Set Ready —...

  • Page 231: Vf Connector Pin Assignments

    Pin Assignments VF Connector Pin Assignments Table C-2 lists the connector pin assignments for Model 3910 modular jacks as well as the pin assignments for the TELCO jacks. (See Figure C-1.) Table C-2 VF Connector Pin Assignments Type of Telco Jack Leased Dial 6-Pin...
  • Page 232 COMSPHERE 3900 Series 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 September 1998 3910-A2-GN32-40...
  • Page 233 Pin Assignments 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 —...
  • Page 234 COMSPHERE 3900 Series Modems To connect a Model 3910 port to another modem’s EIA-232-D interface, use a 25-pin crossover cable (Figure C-4). 25-POSITION 25-POSITION PLUG PIN NO. PLUG PIN NO. XTXC XTXC Figure C-4. Wiring Diagram — 25-Pin Crossover Cable September 1998 3910-A2-GN32-40...

  • Page 235: Call Request Commands

    ITU-T V.25bis Dialing Commands and Responses Overview This appendix describes V.25bis dialing commands and responses. ITU-T V.25bis is an international dialing protocol that permits direct and stored number dialing using DTEs in either Asynchronous, Bisynchronous, or HDLC operating mode. The 391x Series modems support V.25bis request and answer commands.

  • Page 236: Call Response

    COMSPHERE 3900 Series Modems Call Request with Stored Memory Address Provided (CRS) The CRS command dials the telephone number stored in the request directory location. CRS is similar to the ATDS command. The CRS command format is: CRSx Where: x is directory location 1–24. The modem responds to the command with either a VAL (valid) or INV (invalid) response followed by a call progress report such as connect (CNX) or failure (CFI).

  • Page 237: Call Answer Commands

    ITU-T V.25bis Dialing Commands and Responses Delayed Call Indicator The DLC response is issued to the DTE if the modem is not currently allowed to call the number. DLC is similar to the AT result code DELAYED. The DLC response format is: DLCn Where: n is the delay (in minutes) before the number can be called.
  • Page 238 COMSPHERE 3900 Series Modems Program Normal (PRN) The Program Normal (PRN) command allows the DTE to enter and store a telephone number to a specific directory location. PRN is similar to the AT&Z command. The PRN command format is: PRNx;n Where: x is the directory location 1–24;...

  • Page 239: Command Response

    ITU-T V.25bis Dialing Commands and Responses List Delayed Numbers Response (LSD) LSD is a response to an LSD command issued by DTE. LSDx;n;d Where: x is a sequence number (not a directory location). n is the telephone number. d is the delay in minutes List Forbidden Numbers Response (LSF) The LSF response format is : LSFx;n...
  • Page 240 COMSPHERE 3900 Series Modems Invalid (INV) The INV response indicates that the modem has received an incorrect V.25bis command from the DTE. INV is similar to the AT result code ERROR. The INV response format is: INVxx Where: xx is CU command unknown.
  • Page 241 ITU-T V.25bis Dialing Commands and Responses Table D-2 lists V.25bis response messages supported by the 391x Series modems. Table D-2 V.25bis Response Messages AT Command/ V.25bis Command Description Result Code Equivalent Call Response Call Failure Indication BUSY, NO ANSWER, NO CARRIER, NO DIAL TONE, ERROR Call Connecting Indication...
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  • Page 243: Ascii Character Table

    ASCII Character Table Overview Table E-1 in this appendix provides the ASCII character table. Table E-1 (1 of 4) ASCII Characters Hexadecimal Decimal Control ASCII Value ASCII Value Character CTRL-@ CTRL-A CTRL-B CTRL-C CTRL-D CTRL-E CTRL-F CTRL-G CTRL-H CTRL-I CTRL-J CTRL-K CTRL-L CTRL-M...
  • Page 244 COMSPHERE 3900 Series Modems Table E-1 (2 of 4) ASCII Characters Hexadecimal Decimal Control ASCII Value ASCII Value Character CTRL-Y CTRL-Z CTRL-[ CTRL-/ CTRL-] CTRL-|Ax CTRL-_ spacebar “ & ’ < September 1998 3910-A2-GN32-40...
  • Page 245 ASCII Character Table Table E-1 (3 of 4) ASCII Characters Hexadecimal Decimal Control ASCII Value ASCII Value Character > 3910-A2-GN32-40 September 1998...
  • Page 246 COMSPHERE 3900 Series Modems Table E-1 (4 of 4) ASCII Characters Hexadecimal Decimal Control ASCII Value ASCII Value Character delete September 1998 3910-A2-GN32-40...
  • Page 247 Default Configuration Options Overview Table F-1 lists all default configuration options for the factory preset configurations. An N/A indicates that the value for this configuration option does not appear on the LCD when that factory default configuration is selected. 3910-A2-GN32-40 September 1998...
  • Page 248 COMSPHERE 3900 Series Modems Table F-1 (1 of 7) Factory Default Configuration Options Sync Leased Async Leased Async Dial UNIX Dial Sync Dial Configuration Default Default Default Default Default Default Option Settings Settings Settings Settings Settings Settings DTE Interface Async/Sync Sync Async Sync...
  • Page 249 Default Configuration Options Table F-1 (2 of 7) Factory Default Configuration Options Sync Leased Async Leased Async Dial UNIX Dial Sync Dial Configuration Default Default Default Default Default Default Option Settings Settings Settings Settings Settings Settings DTE Dialer DTE Dialer Type Disable Disable Disable...
  • Page 250 COMSPHERE 3900 Series Modems Table F-1 (3 of 7) Factory Default Configuration Options Sync Leased Async Leased Async Dial UNIX Dial Sync Dial Configuration Default Default Default Default Default Default Option Settings Settings Settings Settings Settings Settings Line Dialer Auto-Answer Ring Count Dialer Type Tone...
  • Page 251 Default Configuration Options Table F-1 (4 of 7) Factory Default Configuration Options Sync Leased Async Leased Async Dial UNIX Dial Sync Dial Configuration Default Default Default Default Default Default Option Settings Settings Settings Settings Settings Settings Leased Line Leased Mode 4-wire LL 4-wire LL 4-wire LL...
  • Page 252 COMSPHERE 3900 Series Modems Table F-1 (5 of 7) Factory Default Configuration Options Sync Leased Async Leased Async Dial UNIX Dial Sync Dial Configuration Default Default Default Default Default Default Option Settings Settings Settings Settings Settings Settings V.42/MNP/ Buffer Error Control N/A (Direct) V.42/MNP or N/A (Direct)
  • Page 253 Default Configuration Options Table F-1 (6 of 7) Factory Default Configuration Options Sync Leased Async Leased Async Dial UNIX Dial Sync Dial Configuration Default Default Default Default Default Default Option Settings Settings Settings Settings Settings Settings Misc Straps When No Change No Change No Change No Change...
  • Page 254 COMSPHERE 3900 Series Modems Table F-1 (7 of 7) Factory Default Configuration Options Sync Leased Async Leased Async Dial UNIX Dial Sync Dial Configuration Default Default Default Default Default Default Option Settings Settings Settings Settings Settings Settings Security Entry Wait Time 20 sec 20 sec 20 sec...
  • Page 255 Sample Configurations Overview This appendix provides diagrams of sample configurations for the 391x Series modems. Following each diagram, the appropriate configuration options and cables are listed. 3910-A2-GN32-40 September 1998...
  • Page 256 COMSPHERE 3900 Series Modems Point-to-Point Figure G-1 shows a sample configuration for point-to-point applications. 19200(V32t) 19200(V32t) Leased 3910 3910 (Sync) (Sync) Cable 1 Cable 2 Cable 2 Cable 1 Figure G-1. Sample Configuration — Point-to-Point Configuration Options 3910 A Use Sync Leased (Answer) default configuration options. 3910 B Use Sync Leased (Originate) default configuration options.
  • Page 257 Sample Configurations Multipoint Figure G-2 shows a sample configuration for multipoint applications. TMp control modems can accept mixed inbound rates from tributary modems. For example, one inbound link may be configured for 14.4 kbps while another link experiencing line impairments may be configured for 9.6 kbps.
  • Page 258 COMSPHERE 3900 Series Modems Point-to-Point with Automatic Dial Backup Figure G-3 shows a sample configuration for point-to-point applications with automatic dial backup. Dial Cable 3 Cable 3 19200(V32t) 19200(V32t) Leased 3910 3910 (Sync) (Sync) Cable 1 Cable 2 Cable 2 Cable 1 Figure G-3.
  • Page 259 Sample Configurations Point-to-Point with Network Management Figure G-4 shows a sample configuration for point-to-point applications with network management. 19200(V32t) 19200(V32t) Leased 3910 3910 (Sync) (Sync) Cable 1 3600- Cable 2 Cable 2 Cable 1 Hubbing Device Cable 4 (6700 6800) Adapter (002-0025-0031) Figure G-4.
  • Page 260 COMSPHERE 3900 Series Modems Carrier with Network Management Figure G-5 shows a sample configuration for COMSPHERE 3000 Series Carrier applications with network management. 19200(V32t) 19200(V32t) Leased 3911 3910 (Sync) (Sync) Cable 2 Cable 2 Cable 1 Cable 1 Circuit Card COMSPHERE 3000 Series Carrier Cable 4...
  • Page 261 Sample Configurations Extended Multipoint Figure G-6 shows a sample configuration for extended multipoint applications. 19200(V32t) 19200(V32t) 4800 4800 (Sync) Leased 4800 3920 3920 (Sync) 4800 4800 4800 (Sync) Cable 2 Cable 2 4800 (Sync) Cable 1 Cable 1 Cable 1 Cable 1 4800 Cable 1...
  • Page 262 COMSPHERE 3900 Series Modems Configuration Options 3920 A Use Sync Leased (Answer) default configuration options with the following exception: Rate at 19.2K Set ports 1, 2, 3, and 4 to 4800. 3920 B Use Sync Leased (Originate) default configuration options with the following exceptions: TX Clock Source Set to RXC_Loop.
  • Page 263 Sample Configurations Extended Diagnostics Figure G-7 shows a sample configuration for extended diagnostics. Figure G-7. Sample Configuration Extended Diagnostics Configuration Options 3910 A Use Sync Leased (Answer) default configuration options with the following exception: Network position Set to Control. 3910 B Use Sync Leased (Originate) default configuration options with the following exception: TX Clock Source...
  • Page 264 COMSPHERE 3900 Series Modems 3910 Use Sync Leased (Answer) default configuration options with the following D,F,H exceptions: TX Clock Source Set to RXC_Loop. 3910 E,G Use Sync Leased (Answer) default configuration options with the following exceptions: Diagnostic Connection Set to Modem (DC). Network Position Set to Control.

  • Page 265: Equipment List

    Equipment List Equipment Feature/ Part Number Model 3910 3910-A1-40X Model 3911 3911-B1-00X 6-position, 4-wire modular cord, 7-foot length 125-0067-0031 8-position, 8-wire modular cord, 14-foot length 125-0053-1431 Universal Power Supply 327-0074-0131 3600 Hubbing Device 3600-F3-300 EIA-323-D/V.24 Crossover Cable 818-2759-0111 6 position, 6-wire modular cord 125-0040-0031 8 position, 8-wire modular cord 125-0053-1431...
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  • Page 267 Glossary 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 268 COMSPHERE 3900 Series Modems baud A unit of signaling speed that is equal to the number of symbols per second. This is not necessarily the same as bits per second, although the terms are frequently interchanged. Bell 103J A standard for 300 bps data transmission. Bell 212A A standard for 1200 bps data transmission.
  • Page 269 Glossary constant carrier The modem transmits a carrier signal constantly, regardless of RTS. mode Control Channel The diagnostic interface between a network management system and a network device. (CC) control modem It polls downstream tributary modems across the analog channel. controlled carrier The mode in which the modem’s transmitter turns on and off in response to RTS.
  • Page 270 COMSPHERE 3900 Series Modems download A process that transfers device firmware and software from a locally-attached PC to a device, or allows the duplication of firmware and software from a local device to a remote device. downstream device A device that is connected farther from the host computer. Data Terminal Equipment.
  • Page 271 Glossary interface A shared boundary between functional units. International Telecommunications Union. The telecommunications agency of the United Nations, established to provide standardized communications procedures and practices. Before March 1993 it was called CCITT. 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.
  • Page 272 COMSPHERE 3900 Series Modems Network Interface Module. The interface provided for the public switched telephone network (PSTN). There are two NIMs per carrier. Network Management System. A computer system used for monitoring and controlling network devices. nonlinear distortion VF line distortion which is usually associated with pulse-code modulation (PCM) compandor noise on the phone line.
  • Page 273 Glossary Return to Dial A function available when in Dial Backup mode that allows the modem to switch to dial-line operation when currently on leased lines. RJ11 A type of 6-position jack normally used with permissive dial networks and telephone sets. RJ21 A type of 50-position jack normally used with permissive dial networks providing the appropriate conductors for up to eight telephone lines.
  • Page 274 COMSPHERE 3900 Series Modems V.22bis An ITU-T standard for modems operating full-duplex with asynchronous or synchronous data at 1200 or 2400 bps over the dial network (PSTN). V.25bis An ITU-T standard dialing protocol that permits direct and stored-number dialing in asynchronous, bisynchronous, or HDLC modes.
  • Page 275 Index Blid Dial Pause, 5-26 Break Buffer Control, 5-44 Abort (test), 8-2–8-10 Break Forces Escape, 5-21 ac power requirements, 1-9 Buffer Disconnect Delay, 5-45 Access from Remote, 5-49 buffer size, reduced asynchronous, 5-45 Active (Operating) configurations, 5-1 busy control, 7-5–7-7 Active (Saved) configurations, 5-1 Busy Tone Detect, 5-26 address, network management, 5-50, 6-2...
  • Page 276 COMSPHERE 3900 Series Modems Dual Leased Line, 5-38 dual leased–line operation. See backup, leased data compression, 5-40 MNP5, 5-40 V.42bis, 5-40 data rate dial line, 5-30 EIA LEDs, 7-4–7-7 forced to VF rate, 5-18 EIA-232-D leased line, 5-34 cable connection, 2-4, B-3 data rates.
  • Page 277 Index Identity, 4-6 Make Busy, 7-5–7-7 indicators Automatic, 5-28 definitions, 3-6 NIM, 5-28 status (LEDs), 3-3–3-5 Via DTR, 5-29 installation manual dial. See Talk/Data Model 3910, 2-2–2-12 menu Model 3911, 2-9–2-11 structure, 3-8 quick configuration display, 3-13 tree, A-1–A-3 messages LCD, 3-8–3-14, 4-9–4-10 result codes, 14-3–14-4 keypad, 3-7...
  • Page 278 COMSPHERE 3900 Series Modems part numbers, 4-6, H-1 S-Register list, 14-14–14-28 passwords Security administrative, 12-5–12-6 access messages, 3-12 remote access, 5-5–5-8, 5-49, 13-2, 13-3, 13-4, 13-5 branch, 3-8, 12-4–12-12 security, 12-2–12-4, 12-16–12-17 configuration options, 12-13–12-15 pattern test, 8-7–8-10 database tables, 12-2, 12-3, 12-18–12-19 pause time, for comma in dial string, 5-26 passwords, 12-2–12-4, 12-16–12-17 phone.
  • Page 279 Index Test branch, 8-1–8-2 V.42bis data compression, 5-40 in menu structure, 3-8 V.54 Test configuration options group, 5-46–5-47 Address, 5-47 TMP default configurations. See default configuration Device Type, 5-47 options TMp Train Time, 5-37 connection, 2-4, B-4–B-5 TMp Transmit Preemphasis, 5-37 interface requirements, 1-9 top-level menu messages, 3-8–3-14 pin assignments, C-3...
  • Page 280 COMSPHERE 3900 Series Modems Index-6 September 1998 3910-A2-GN32-40...

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