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Paradyne COMSPHERE 3821Plus User Manual

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COMSPHERE
3821 P
MODEM
LUS
USER'S GUIDE
Document No. 3821-A2-GB20-30
February 1998

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Summary of Contents for Paradyne COMSPHERE 3821Plus

  • Page 1 COMSPHERE 3821 P MODEM USER’S GUIDE Document No. 3821-A2-GB20-30 February 1998...
  • Page 2 For the 3821Plus modem the USOC for Permissive mode is RJ21X. The Canadian equivalent to the USOC is CA21A. For single line connection to an analog private line, an adapter cable should be used to facilitate connection to a JM8 jack. The Canadian equivalent is CA40A.

  • Page 3: Important Safety Instructions

    Important Safety Instructions 1. Read and follow all warning notices and instructions marked on the product or included in the manual. 2. Slots and openings in the cabinet are provided for ventilation. To ensure reliable operation of the product and to protect it from overheating, these slots and openings must not be blocked or covered. 3.
  • Page 4 COMSPHERE 3821Plus Modem Notices February 1998 3821-A2-GB20-30...

  • Page 5: Government Requirements And Equipment Return

    Government Requirements and Equipment Return Certain governments require that instructions pertaining to modem connection to the public switched telephone network be included in the installation and operation manual. Specific instructions are listed in the following sections. United States Notice to Users of the Public Switched Telephone Network 1.
  • Page 6 COMSPHERE 3821Plus Modem Canada Notice to Users of the Canadian Public Switched Telephone Network The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operational and safety requirements. The Department does not guarantee the equipment will operate to the user’s satisfaction.

  • Page 7: Safety Notice

    This modem is suitable for connection to BT circuits with signalling at a nominal frequency of 2280 Hz and may be connected to multipoint or point-to-point circuits. The apparatus does not require signalling or otherwise use the frequency range 0 –200 Hz. No d.c.

  • Page 8: Table Of Contents

    ..........3821Plus Installation .
  • Page 9 COMSPHERE 3821Plus Modem AT Commands and S-Registers Fax Operation Remote Access Security SDCP Menu Tree Result Codes Troubleshooting Overview ..........
  • Page 10 Technical Specifications Pin Assignments ITU-T V.25bis Dialing Commands and Responses Equipment List Country-Specific Configuration Options Glossary Index 3821-A2-GB20-30 EIA-232-E Pin Assignments ....... JM8 to RJ11 Crossover Cable .

  • Page 11: Preface

    Objectives and Reader Assumptions This guide describes how to install the 3821Plus circuit card and operate the 3821Plus modem. It is intended for all users of the 3821Plus modem. Each 3821Plus card comprises three modems. In general this guide refers to the 3821Plus modem with regard to operation and the 3821Plus card with regard to installation.

  • Page 12: Related Documents

    COMSPHERE 3821Plus Modem Related Documents 3000-A2-GA31 COMSPHERE 3000 Series Carrier Installation Manual 3980-A2-GB30 COMSPHERE 3800Plus Modems, User’s Guide 6700-A2-GY31 COMSPHERE 6700 Series Network Management System, User’s Guide 6800-A2-GE26 COMSPHERE 6800 Series Network Management System, User’s/System Administrator’s Guide Call your sales representative to order additional product documentation.

  • Page 13: Introduction

    Each is a software-definable high-speed modem that offers reliable asynchronous and synchronous operation over dial or two-wire leased-line networks. Features The 3821Plus modem has a wide variety of features, including: Dial-Line Modulations: ITU-T V.34 (up to 33,600 bps), V.32terbo (19,200 and 16,800 bps), ITU-T V.32bis (up to 14,400 bps), V.32 (up to...

  • Page 14: Status Indicators

    The status indicators on a 3821Plus circuit card continuously provide information on the modem’s operating condition. The status indicators for the 3821Plus card are located on its faceplate, the SDCP, and the Shared Diagnostic Unit (SDU) faceplate The 3821Plus card has 13 Light Emitting Diodes (LEDs).
  • Page 15 Label Color ALRM A Alarm A ON: Modem A has detected a problem with its operation. ALRM B Alarm B ON: Modem B has detected a problem with its operation. ALRM C Alarm C ON: Modem C has detected a problem with its operation. Mod A green Modem A...

  • Page 16: Sdcp Operation

    Select Select in a specific slot in the carrier. The Front Panel LED of the 3821Plus card turns ON when the SDCP is connected to it. February 1998 key returns you to the Top-Level menu while changing configuration options key moves you up one level in the menu tree.

  • Page 17: 3821 Plus Modem Installation

    Selecting Configurations Using the SDCP Selecting Configurations Using AT Commands Overview This chapter describes how to install the 3821Plus card and connect both provided and customer-supplied cables to the modems. In addition, it describes how to configure 3821Plus modems for specific applications.
  • Page 18 COMSPHERE 3821Plus Modem P20 P19 Install the NIM A NIM can be installed on the left or right side of the back of the 3000 Series Carrier. Procedure 1. If you are installing a NIM on the right side of the carrier, press it onto the connectors P24 and P23.
  • Page 19 2. Insert the screws provided, but do not completely tighten them. See TABS SLOTS Figure 2-3. DTE Interface Assembly February 1998 3821Plus Modem Installation Figure 2-3. BACKPLATE ASSEMBLY 495-14799...
  • Page 20 COMSPHERE 3821Plus Modem Install the Circuit Card Slide the 3821Plus card into its slot in the 3000 Series Carrier. Press firmly until the back edge of the card seats in the socket of the DTE interface assembly. Figure 2-4 shows circuit cards in a carrier in which the NIM and DTE interface assembly were installed on the right side of the backplane.

  • Page 21: Install Communications Software

    A dumb asynchronous terminal, however, does not require this software since it can directly send AT commands. The 3821Plus can be used with any major communications software. Refer to your software’s user’s guide for installation procedures. For an overview of how...
  • Page 22 COMSPHERE 3821Plus Modem 5. Press the key until the appropriate factory preset appears on the LCD, and press the corresponding function key to select your choice. 6. Choose Function appears and displays the Edit and Save functions. 7. Press the F3 key (Save) to save the new factory...
  • Page 23 To establish a connection with a remote modem, use the D (Dial) command. Refer to Chapter 4, S-Registers, for more information. February 1998 3821Plus Modem Installation AT Commands and AT Commands...

  • Page 24: Sdcp Menus

    Menu Structure ..............Modem Status Messages .

  • Page 25: Menu Structure

    Shared Diagnostic Control Panel (SDCP). The menu tree is a hierarchical structure used to display functions that configure and control local and remote 3821Plus modems. It is accessed via the SDCP and is shown in its entirety in Appendix The menu tree contains the following branches:...

  • Page 26: Modem Status Messages

    Modem Status Messages Access to all menu tree branches from the SDCP begins at the Top-Level menu, the head of the menu hierarchy. The LCD’s top line identifies the modem status, as listed in Table 3-1, while the bottom line displays the main menu tree branches and operational and dial access security messages, as listed in Table...
  • Page 27 COMSPHERE 3821Plus Modem Normal Call Setup Messages Off Hook The modem is off-hook and waiting to dial a telephone number. Dialing The remote modem is being dialed. Training The modem is training or retraining. EC Negotiating The local and remote modems are negotiating the highest possible level of error control compatible between both modems.
  • Page 28 Call Disconnect Messages, continued LongSpace Disc The modem has disconnected due to the detection of a long space. NoData Disc The modem has disconnected due to a lack of transmitted and received data. Disconnecting The modem has begun the disconnect sequence. Rmt Cmnded Disc The modem has disconnected due to a V.32 or V.34 Cleardown received from the remote modem.
  • Page 29 COMSPHERE 3821Plus Modem Dial Access Security Messages Get VF PsWd The answering modem is waiting for the originating caller to transmit a VF password. Get DTE PsWd The answering modem is waiting to receive a valid DTE password from the remote DTE.

  • Page 30: Modem Select Branch

    Asynchronous mode.) Displays the line mode. The letters LA indicate Leased Answer mode, LO indicate Leased Originate mode, and D indicates Dial mode. Displays the DTE port. For the 3821Plus modem, this is always P1. February 1998 SDCP Menus xxxx yyyyy >...
  • Page 31 COMSPHERE 3821Plus Modem ffff Displays the modem’s modulation scheme as shown below: indicates V.34 family modulation. V32t indicates V.32terbo modulation. V32b indicates V.32bis modulation. indicates V.32 modulation. V22b indicates V.22bis modulation. V27b indicates V.27bis modulation. indicates V.33 modulation. indicates V.29 modulation.

  • Page 32: Call Setup Branch

    Call Setup Branch The Call Setup branch of the Top-Level menu allows you to dial, disconnect, and answer telephone calls. It also allows you to create and store up to 10 telephone numbers to directory locations. Four different functions can appear under Call Setup: Dial Disconnect Answer...

  • Page 33: Change Directory

    COMSPHERE 3821Plus Modem Change Directory Change Directory allows you to enter or modify telephone numbers. The modem has nonvolatile memory locations that allow you to store up to 10 telephone numbers. Each directory location can accept up to 40 characters; this includes the telephone number and dial command modifiers.

  • Page 34: Status Branch

    Status Branch The Status branch of the Top-Level menu allows you to view the current status of the dial or leased-line connection, the DTE interface, and the identity (for example, serial number and model number) of your equipment. The selections under Status are: Identity Options Record...

  • Page 35: Identity

    COMSPHERE 3821Plus Modem Identity Identity displays the modem’s serial number, model number, firmware revision level, hardware part number and firmware part number. Retrieval of this information is useful if you are purchasing additional or replacement modems and/or making firmware upgrades.

  • Page 36: Test Branch

    To exit this function and remain in the Status branch, press the key. To exit and return to the Top-Level menu, press the key. Test Branch The Test branch of the Top-Level menu allows you to initiate various modem tests. Use these tests if you are having data communication problems, such as periodic character loss, random errors, or constant format errors.

  • Page 37: Remote Digital Loop

    COMSPHERE 3821Plus Modem If the Test Timeout configuration option is enabled, Test Timeout appears at the conclusion of the test. If it is disabled, the test operates until aborted. For more information on the Test Timeout configuration option, refer to Table 3-10 in this chapter.

  • Page 38: Configure Branch

    Configure Branch After installing a 3821Plus modem, you set its software configuration options using either the SDCP or the AT command set. This section describes how to access and use the Configure branch of the Top-Level menu via the SDCP.

  • Page 39: Editing And Saving A Configuration Option

    COMSPHERE 3821Plus Modem (Modem Status) MDMA mdmb mdmc Status Test Call_Setup Control Configure Ld EditArea frm: Factory Activ (Operating) Customer2 Customer1 Async_Dial Sync_Leased Active (Saved) Sync_Dial Choose Mode Answer Originate Choose Function Edit Save Active (Saved) Customer1 DTE_Interface Line_Dialer Leased_Line...
  • Page 40 Scroll to and select the Misc configuration options group. Edit StrapGroup Test Misc StrapsWhenDisc No_Change Select Nxt until RemAccssPasswrd appears. RemAccssPasswrd Select the F2 ( ) key to increment password values. RemAccssPasswrd Press the key to move the cursor to the next position.

  • Page 41: Dte Interface

    COMSPHERE 3821Plus Modem key causes you to exit the Configure branch and return to the Top-Level menu. If any changes are made to configuration options, the SDCP allows you to save these changes to either the Active (Saved), Customer 1, or Customer 2 configuration areas.
  • Page 42 Async/Sync Mode: Async Nxt Async Sync 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 for Sync, then the modem operates in Async mode when offline.
  • Page 43 COMSPHERE 3821Plus Modem Asyn Parity Bit: None Nxt None Even Odd Mark Space This configuration option only appears if Async/Sync Mode is configured for Async or DTE Dialer Type is enabled. Asynchronous Parity Bit. Determines type of asynchronous parity bit. The parity of the DTE must match the parity of the modem.
  • Page 44 SDCP Menus Table 3-4 (3 of 6) DTE Interface Configuration Options DTR Action: Ignore Nxt Stndrd_RS232 Ignore CntrlsOnHook Off=ReloadStrp Off=CmdMode 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 45 COMSPHERE 3821Plus Modem RTS Action: Ignore Nxt Ignore Stndrd_RS232 Sim_Cntl_Car Request-to-Send Action. RTS is a signal from the DTE to the modem indicating the DTE has data to send to the modem. Ignore – Modem assumes RTS is always ON. Use this selection when the DTE does not provide RTS to the modem.
  • Page 46 RTS/CTS Delay: 0 msec Nxt 0msec 10msec 50msec 150msec 600msec Request-to-Send/Clear-to-Send Delay. RTS/CTS Delay sets the delay time between the modem receiving RTS from the DTE and the modem sending CTS to the DTE. This delay is only valid in Async Direct mode and synchronous applications when it is necessary to have a short delay between the time the DTE raises RTS and the time the modem presents CTS to allow the DTE to send data.
  • Page 47 COMSPHERE 3821Plus Modem TX Clock Source: Internal Nxt Internal External RXC_Loop This configuration option only appears when Async/Sync Mode is configured for Sync. Transmit Clock Source. Determines the source of timing for synchronous data transmitted from the DTE. Internal – The transmit data’s clock source is derived from the modem’s internal clock and output on Pin 15 (TXC) of the RS-232D interface.
  • Page 48 DTE Dialer The DTE Dialer configuration options establish the DTE-to-modem protocol for call establishment and control. DTE Dialer Type: AT Nxt AT Disable V25bis_Async V25bis_Bsync V25bis_HDLC DTR=Direct1 AT&T_Exclusv Data Terminal Equipment Dialer Type. Identifies to the modem the type of dialing method and protocol used by the DTE. AT –...
  • Page 49 COMSPHERE 3821Plus Modem *Escape GuardTim: 1sec Nxt 1sec 200msec 400msec 600msec 800msec 2sec Escape Guard Time. Determines the length of the required pause before and after the escape sequence is issued. The guard time prevents the modem from interpreting data as the escape sequence characters.
  • Page 50 SDCP Menus Table 3-5 (3 of 5) DTE Dialer Configuration Options *Linefeed Char: 010 ASCI 010 ASCI Line Feed Character. Sets the character used to perform a line feed in Command mode for responses from the modem. The factory default is 010 (ASCII line feed character). AT command equivalent is S-register S4= n .
  • Page 51 COMSPHERE 3821Plus Modem *ResultCode Form: Words Nxt Words Numbers (1) Numbers (2) Result Codes Format. Controls whether or not result codes appear as words or as numeric codes. Some DTEs do not recognize result codes as words; therefore, numbers are required. The Numbers (2) format is required for some modem pooling applications.
  • Page 52 SDCP Menus Table 3-5 (5 of 5) DTE Dialer Configuration Options V25bis IdleFill: Mark Nxt Mark Flag V.25bis Idle Fill. Determines whether a mark or flag is used as an idle fill character for the DTE. The modem responds to the DTE using the same idle fill.
  • Page 53 COMSPHERE 3821Plus Modem Line Dialer The Line Dialer configuration options establish parameters used by the modem to answer or originate calls. AutoAnswerRing#: 1 Nxt 1 Disable 2 4 6 8 10 Auto-Answer Ring Count. Determines the number of rings necessary before the answering modem answers an incoming call.
  • Page 54 BusyTone Detect: Enable Nxt Enable Disable Busy Tone Detect. Sets the modem to monitor for Busy Tone (Enable) or ignore Busy Tone (Disable). This configuration option is normally enabled; however, if the modem receives false busy tones, this configuration option can be disabled and the modem ignores all busy tones.
  • Page 55 COMSPHERE 3821Plus Modem Long Space Disc: Enable Nxt Enable Disable Long Space Disconnect. Determines the modem’s response to a continuous spacing condition sent from the remote modem when it goes on-hook. Issuing a long space is one method of disconnecting a call.
  • Page 56 NoDataDiscTrig: TXD and RXD Nxt TXD and RXD TXD Only RXD Only TXD or RXD No Data Disconnect Trigger Signal. Works in conjunction with No Data Disconnect (\T), and determines whether Pin 2 (transmit data) or Pin 3 (receive data) of the modem’s RS-232 serial interface is monitored so that the modem can disconnect the call if there is no activity for a certain period of time.

  • Page 57: Dial Line

    COMSPHERE 3821Plus Modem Dial Line The Dial Line configuration options are used to configure the modem for operation over dial lines. Table 3-7 shows each Dial Line configuration option as it appears on the LCD. Modulation: V34 Nxt V34 V32bis/terbo V21/V22/BELL Modulation determines the modem’s primary dial modulation group: V.34;...
  • Page 58 SDCP Menus Table 3-7 (2 of 3) Dial Line Configuration Options Automode: Enable Nxt Enable Disable System 85 Automode. Allows the modem to automatically detect the remote modem’s modulation. Enable – The modem automatically adapts to the modulation scheme and line rate of the remote modem, and the VF line condition.
  • Page 59 COMSPHERE 3821Plus Modem V22b Guard Tone: Disable Nxt Disable 550Hz 1800Hz V.22bis Guard Tone. Determines whether the V.22bis guard tone is disabled, set to 550 Hz, or set to 1800 Hz. Disable – No guard tone. 550 Hz or 1800 Hz – When the modem is in Answer mode, it transmits the guard tone at this frequency.

  • Page 60: Leased Line

    Leased Line The Leased Line configuration options are used to configure the modem for operation over leased lines. The Leased Line configuration group only appears if the modem is configured with the Sync Leased factory preset template, or if the &L1, &L2, &L3, or &L4 command is entered.
  • Page 61 COMSPHERE 3821Plus Modem Autorate: Enable Nxt Enable Disable Autorate. The modems adapt to VF line condition and connect at the optimum rate during initial line establishment. Once connected, the modem automatically lowers the line rate if line conditions become impaired. When line conditions improve, the modem automatically shifts up to the highest data rate the line can support.

  • Page 62: V.42/Mnp/Buffer

    V.42/MNP/Buffer V.42/MNP/Buffer configuration options determine the type of error correction and flow control used by the modems and attached DTEs. Some choices within this group may not appear depending upon how previous configuration options have been selected. If the Async/Sync Mode configuration Err Contrl Mode: V42/MNPorBfr V42/MNPorBfr V42/MNPorDsc...
  • Page 63 COMSPHERE 3821Plus Modem V42bis Compress: Enable Nxt Enable Disable This configuration option only appears if Async/Sync Mode is configured for Async and the Error Control Mode configuration option is set for V42/MNPorBfr or V42/MNPorDsc. V.42bis Compression. Enables or disables V.42bis data compression.
  • Page 64 SDCP Menus Table 3-9 (3 of 5) V.42/MNP/Buffer Configuration Options Flw Cntl of DTE: CTS_to_DTE Nxt CTS_to_DTE Disable XON/XOFF This configuration option only appears if Async/Sync Mode is configured for Async. Flow Control of DTE. Determines how the modem controls the flow of data from the DTE. CTS to DTE –...
  • Page 65 COMSPHERE 3821Plus Modem Mdm/Mdm FlowCtl: Disable Nxt Disable Enable This configuration option only appears if Async/Sync Mode is configured for Async and the Flow Control configuration option is configured for XON/XOFF. Modem-to-Modem Flow Control. If a modem’s buffers begin to fill due to data it is receiving from the remote modem, but is not passing on to the DTE, it can issue XON/XOFF flow control characters to the remote modem.
  • Page 66 TXBuffDiscDelay: 10sec Nxt 10sec Disable 60sec This configuration option only appears when Async/Sync Mode is configured for Async, and Error Control Mode is not configured for DirectMode. Transmit Buffer Disconnect Delay. Determines how long the modem continues to transmit data stored in its Transmit buffer when the modem is commanded to disconnect by a locally attached DTE.

  • Page 67: Test

    COMSPHERE 3821Plus Modem Test The Test configuration options determine specifics, such as the duration of a test, for the various diagnostic tests available to the modem. Test Timeout: Disable Nxt Disable 30sec 60sec 240sec Test Time-out. Determines how long a test runs before aborting.

  • Page 68: Misc

    Misc The Miscellaneous configuration options determine specifics for various functions, including network management parameters and remote modem access. StrapsWhenDisc: No_Change Nxt No_Change Reload RelodNoATChg Straps When Disconnected. Determines whether or not configuration options in the Active (Saved) configuration area are reloaded to Active (Operating) when a disconnect occurs.
  • Page 69 COMSPHERE 3821Plus Modem NetMngmtAddress: 256 Network Management Address. Determines the address used when accessing a locally attached modem from the 6700 Series NMS. This configuration option is ignored by remote modems. Address values range from 001 to 256. The factory default templates do not affect Network Management Address.

  • Page 70: Control Branch

    A service line is an extra dial line connected to a COMSPHERE 3000 Series Carrier. This line is normally shared by up to eight 3821Plus cards (24 modems) installed in either Slots 1–8 or Slots 9–16. However, by daisy chaining the service-line connector of one Network...

  • Page 71: Download Code

    Remote is used to transfer an exact copy of the firmware currently stored in a 3821Plus modem to another 3821Plus modem. For this to occur, the modem must be connected to the remote modem via a leased-line network or an established dial-line network. If these prerequisites do not exist, then this selection does not appear on the LCD.

  • Page 72: Automatic Firmware Download

    Automatic Firmware Download New releases may be available for the 3821Plus modem. The latest 3821Plus firmware is avaiable at no charge from the Automatic Firmware Download Center. Refer to page A in the front of this document for contact information.

  • Page 73: At Commands And S-Registers

    Escape Sequence and Escape Guard Time The escape sequence is only issued when the modem is online and in Data mode. The 3821Plus modem uses three consecutive plus (+) characters as the escape sequence. (To change this value, refer to S-register S2 discussed...

  • Page 74: Command Guidelines

    Enter Table 4-1 lists all AT commands supported by the 3821Plus modem. The Async Dial factory default is listed in bold. Reference to particular country codes in this guide is not an assurance that the modem has been approved for use in that country.
  • Page 75 *** – AT Command Recovery Mode Allows the modem to remain in Asynchronous data mode so that AT commands can be used to change the modem’s current configuration. Use this command when AT commands are disabled or the modem is operating in Synchronous data mode.
  • Page 76 COMSPHERE 3821Plus Modem D n , continued R – Reverse Dial mode. Causes the originating modem to send out an answertone once it no longer detects ringback. (Ringback is the ring you hear at the originating site when making a call.) The R parameter must be the last character in the dial string.
  • Page 77 P – Pulse Dial Sets the modem for Pulse Dial mode. See D command. Q n – Result Codes Result codes are informational messages (such as Connect and Ring) sent from the modem and displayed on the asynchronous DTE terminal. Refer to Q, Q0 Enables modem to send result codes to the DTE.
  • Page 78 COMSPHERE 3821Plus Modem X n – Extended Result Codes, Dial Tone Detect, and Busy Tone Detect The X n command sets three configuration options simultaneously: Extended Result Codes Disable Enable Enable Enable Enable Add/EC Add/V42,MNP Use DTE Rate EXTENDED RESULT CODES Informational messages such as VF (line) connect rate and Error Control are displayed with the result codes.
  • Page 79 F – Clear Error Buffer Clears the buffer where information about the last critical error is stored. For service personnel use only. Clear error buffer. H n – V.42bis Compression Enables or disables V.42bis data compression. H, H0 Disable. Transmit only. Receive only.
  • Page 80 COMSPHERE 3821Plus Modem &D n – DTR Action Data Terminal Ready (DTR) is a signal from the DTE to the modem indicating that the DTE is connected and ready for operation. &D0 Ignore. Modem ignores the true status of DTR and treats it as always ON.
  • Page 81 &I n – Dial Transmit Level for Cellular Auto When Dial Transmit Level Type is set to Permissive, &I n sets Dial Transmit Level to a value between –10 and – 32 dBm. &I99 and &I100 cause the level to be varied automatically according to conditions for ETC operation. &J0 overrides this command, and is the default for North America.
  • Page 82 COMSPHERE 3821Plus Modem &M n or &Q n – Async/Sync Mode and DTE Dialer Type Sets the modem for either asynchronous or synchronous operation and selects the type of dialing method the modem uses. &M, &M0, &Q, &Q0 Modem operates in Asynchronous mode and uses AT Command protocol.
  • Page 83 &S n – DSR Control Data Set Ready (DSR) is a signal from the modem to the DTE indicating the modem is connected and ready for operation. &S, &S0 Forced On. Forces DSR output ON constantly. This is usually used for leased-line applications and when the DTE requires DSR to always be ON.
  • Page 84 COMSPHERE 3821Plus Modem &X n – Transmit Clock Source Determines the source of timing for synchronous data transmitted from the DTE. &X, &X0 Internal. Modem provides transmit clock source for synchronous data (Pin 15). &X1 External. Modem derives external transmit clock source provided on Pin 24 for synchronous data.
  • Page 85 %C n – MNP5 Data Compression Determines if the modem uses MNP Class 5 data compression. It can be set independently of V.42bis data compression. Online changes do not take effect until a disconnect occurs. %C, %C0 Disable. Enable. +FCLASS= n – Service Class Selection Normally set by fax software, Service Class Selection determines the fax protocol.
  • Page 86 COMSPHERE 3821Plus Modem \K n – Buffer Control, Send Break Control, Break Forces Escape The \K n command sets three configuration options simultaneously: Break Buffer Control Discard Data Discard Data Keep Data Keep Data Keep Data Keep Data Discard Break BREAK BUFFER CONTROL Determines if data stored in the modem’s buffer is saved or discarded when the DTE issues a break sequence.
  • Page 87 – The \Q n command controls two configuration options simultaneously: Flow Control of DTE Disable XON/XOFF CTS to DTE CTS to DTE XON/XOFF Disable Disable FLOW CONTROL OF DTE Determines how the modem controls the flow of data from the DTE. FLOW CONTROL OF MODEM Determines how the DTE controls the flow of data from the modem.

  • Page 88: S-Register List

    COMSPHERE 3821Plus Modem S-Register List S-registers affect the operating parameters of the 3821Plus modem. These registers are applicable only when the DTE Dialer Type configuration option is set for AT. (See &Mn and &Qn commands.) S-registers can be displayed and/or modified when the modem is in Command mode.
  • Page 89 S4 – Line Feed Character Determines ASCII value used as the line feed character. Enter a value from 0–127 for the line feed character. Factory setting is 10 (ASCII line feed). S5 – Backspace Character Determines ASCII value used as the backspace (Backspace key). This character moves the cursor to the left and erases the previous character.
  • Page 90 COMSPHERE 3821Plus Modem S14 – Asymmetric Rate Mode Register determines whether VF rates for transmitting and receiving are identical when using V.34 modulation. Enabling the function permits the two rates to be different. Register has the following values: 0 = Enable 1 = Disable Factory setting is Enable.
  • Page 91 S41 – Dial-Line Rate Determines the modem’s highest data rate and modulation scheme for operation on dial lines. S41 can also be set using the %B and %BL commands. Register has the following values (shown in bps): 1 = 14,400 (V.32bis) 2 = 12,000 (V.32bis) 3 = 9600 (V.32bis/V32) 4 = 7200 (V.32bis)
  • Page 92 COMSPHERE 3821Plus Modem S44 – Leased Line Rate Determines the modem’s highest data rate and modulation scheme for operation on 2-wire leased lines in either Answer or Originate mode. Register has the following values (shown in bps): 1 = 14,400 (V.32bis) 2 = 12,000 (V.32bis)
  • Page 93 AT Commands and S-Registers Table 4-2 (6 of 10) 3821 Plus S-Registers S49 – Transmit Buffer Disconnect Delay Determines the maximum amount of time the modem can continue to send data in its Transmit Buffer to the remote modem after it is commanded by the DTE to disconnect. Register has the following values: 0 = Disable (Immediate disconnect) 1 = 1 second...
  • Page 94 COMSPHERE 3821Plus Modem S63 – V.25bis Idle Character Identifies to the modem the type of idle fill used by the DTE while in V.25bis HDLC or V.25bis Bisync mode. Register has the following values: 0 = Mark 1 = Flag Factory setting is Mark.
  • Page 95 AT Commands and S-Registers Table 4-2 (8 of 10) 3821 Plus S-Registers S76 – Autorate (Dial Line) Determines if the Autorate function is used on dial lines when connected in V.32bis, V.34 terbo , or V.34 mode. Autorate allows the modem to adjust line speed due to varying VF line quality. Register has the following values: 0 = Enable 1 = Disable...
  • Page 96 COMSPHERE 3821Plus Modem S84 – AT Command Mode Determines how the modem responds to valid and invalid AT commands. The selections No ERROR and No Strap or ERROR permit installation into applications that are customized for a different modem. Register has the following values: 0 = Normal.
  • Page 97 AT Commands and S-Registers Table 4-2 (10 of 10) 3821 Plus S-Registers S91 – Cellular Enhancement Valid only if ETC is installed. Register determines whether parameters are set to improve performance over a cellular link. Should be enabled when the remote modem is using a cellular connection. Register has the following values: 0 = Disable 1 = Enable...

  • Page 98: Recovering At Commands

    AT commands and place the modem into a state known as Dumb mode. The 3821Plus is capable of normal operation when in Dumb mode. Moreover, the SDCP normally can be used to load the Async Dial factory default and restore the use of AT commands.

  • Page 99: Initialization Strings

    Initialization Strings An initialization string contains several AT commands that are entered at once to program the modem for a specific application. The following initialization strings identify essential AT commands that directly impact modem operation for a particular application. If you need to modify these strings for your application, make sure additional commands are inserted somewhere in the middle of the initialization string.

  • Page 100: Fax Operation

    Your 3821Plus modem supports Class 1 (EIA 578) and Class 2 (EIA/TIA SP-2388) Group III fax, using V.17, V.29, or V.27ter modulations.

  • Page 101: Remote Access

    The Remote Access feature of 3821Plus modems allows you to change configuration options and control test functions in a remote 3821Plus modem from any COMSPHERE 3800, 3800Plus, or 3900 Series modem with a Diagnostic Control Panel (DCP) or a Shared Diagnostic Control Panel (SDCP).
  • Page 102 3821Plus modem. If this is the case, the status message No Response appears on the LCD. If a connection is established but the remote modem’s Access from Remote configuration option...

  • Page 103: Security

    ..............Security Configuration Options Overview Security configuration on the 3821Plus modem is performed with the SDCP, using the Security branch and the Security configuration options under the Configure branch.

  • Page 104: Originate Security

    Originate Security An Originate Access password is entered by a local user to gain access to a local 3821Plus modem. This password must be embedded in the AT dial command. The password must be defined as a DTE_Entry type in the password table.

  • Page 105: Callback Security

    Callback Security Callback Security causes the responding modem to disconnect and call back to the phone number provided by the user at the originating modem. The user enters the number, when prompted by the remote modem, as a Directory location 1–10 preceded by the # sign, or as a complete telephone number (including the pause and wait dial modifiers).

  • Page 106: Select Index

    COMSPHERE 3821Plus Modem EditPassWdTable The Password Table is the modem’s security database. It contains all essential information for each password stored in the modem’s nonvolatile memory. The information associated with each password is known as a record. Records are identified by an index which is a numeric name for a single record.
  • Page 107 Security Table 7-1 (2 of 2) Edit Password Table Group Options Edit PsWd xxxx yyyyyyyy or zzzzzz Edit Password. Allows the password associated with this index to be changed. NOTE: This security option does not appear if the Password Type option is set for Cleared. xxxx –...
  • Page 108 COMSPHERE 3821Plus Modem 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 109 Set Orig Secur 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_Secur from Set Access Ctrl, press key until Set_Orig_Secur appears.
  • Page 110 COMSPHERE 3821Plus Modem Set Admin PsWd Set Administration Password is used to change the Administration Password value. NOTE If this value is forgotten, then the only way to access any of the security functions is by selecting Reset Security. This restores the...

  • Page 111: Security Configuration Options

    Security Configuration Options The Security Configuration Options group under the Configure branch allows you to view and set dial access security parameters. EntryWait_Time: 20 sec Nxt 20 sec 10 sec 40 sec 60 sec Entry Wait Timeout. Determines how long the answering modem waits for the originating modem to enter a VF-side password and DTE-side password.
  • Page 112 COMSPHERE 3821Plus Modem DTE_PW_TermChar: 013 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 1 to 63 or 123 to 127.
  • Page 113 Originate_Secur: No_OrigSec Nxt No_OrigSec Ena_Orig_Sec Originate Security Mode. This configuration option is read-only and cannot be changed from the Configure branch; it can be changed only with an AT command. This configuration option enables or disables security protection used for outbound calls when using the AT command autodialer function.

  • Page 114: Sdcp Menu Tree

    SDCP Menu Tree Overview ................Overview The following pages contain graphic representations of the general menu structure of the SDCP displays.
  • Page 115 COMSPHERE 3821Plus Modem Call_Setup Dial Answer Disconnect Directory Locations 1 – 10 Does not appear in Remote Mode. (Rem_Digital_Loop, Loc_Digital_Loop, and Pattern appear if the secondary channel is used.) Some choices within this group may not appear depending upon how previous configuration options have been selected.
  • Page 116 from previous page Activ (Operating) Active (Saved) from previous page Leased_Line V42/MNP/Buffer Leased Mode Err Contrl Mode Modulation V42bis Compress LeasedLine Rate MNP5 Compress Autorate EC Negotiat Bfr Leased TX Level EC Fallbck Char CarrierOn Level Flw Cntl of DTE Asymmetric Rate Flw Cntl of Mdm XON/XOFF Psthru...
  • Page 117 COMSPHERE 3821Plus Modem from previous page Control Remote Security Secondary Prim (data blckd) (ExitRem appears instead of Remote when using Remote Mode) Set_Access_Ctrl Reset_Security (Admin Password?) EditPassWdTable Set_Orig_Secur Set_Admin_PsWd Set_Answer_Sec Set_CallBack_Sec Make_Busy Download Code RemoveMakeBusy Reset Service_Line DiscServLine Does not appear in Remote Mode.

  • Page 118: Result Codes

    ................Overview Table B-1 lists all the result codes 3821Plus modems may send to the DTE. Result codes can be numeric or verbal, terse or extended. See the Qn, Vn, and...
  • Page 119 COMSPHERE 3821Plus Modem Numbers (1) Numbers (2) *Appears when the Extended Result Codes configuration option is enabled. **Appears when the Extended Result Codes configuration option is set for Use_DTE_Rate. This displays the DTE data rate instead of the line rate.
  • Page 120 Numbers (1) Numbers (2) *** Appears when the Extended Result Codes configuration option is set for Add/EC. If this configuration option is set for Add/V42,MNP, then V42b, V42, MNP5, MNP4, MNP3, MNP2, or NoEC appears. For either suffix type, if the modulation is V.34, /RX=xxxxx/TX=xxxxx is appended showing the VF rates in both directions.

  • Page 121: Troubleshooting

    ............If you would like to download the latest 3821Plus firmware from the Automatic Firmware Download Center, see the instructions at the end of this chapter.
  • Page 122 COMSPHERE 3821Plus Modem Symptom Data scrambled or Verify that the character format (data bits, parity, and stop bits) is set to the same value in unreadable both modems. Missing data during a Verify that you are using the same method of flow control for both the modem and the DTE.
  • Page 123 Symptom Modem does not receive a Check the VF line connection. Verify dial tone at the source. dial tone Modem does not go Verify that the Auto-Answer Ring Count configuration option (S-register 0) is set to a value off-hook and answer an other than 0 (disable).
  • Page 124 COMSPHERE 3821Plus Modem Symptom Intermittent disconnects, Use the AT&T7 command to perform a remote digital loopback test with pattern test. high error rates, or excessive retransmissions Modem connects but sends Your modem may be configured to use security and you are not supplying the proper ERROR result code to DTE passwords.

  • Page 125: Automatic Firmware Download

    Automatic Firmware Download New releases may be available for the 3821Plus modem. The latest 3821Plus firmware is available at no charge from the Automatic Firmware Download Center. Refer to page A in the front of this document for contact information.
  • Page 126 Technical Specifications Model 3821 Plus Technical Specifications Specifications APPROVALS Refer to the label on your modem or contact your sales representative. COMPATIBILITY Dial-Line Modulations AND VF DATA RATES ITU-T V.34 (33,600, 31,200, 28,800, 26,400, 24,000, 21,600, 19,200, 16,800, 14,400, 12,000, 9600, 7200, 4800, 2400 bps) V.32 terbo (19,200, 16,800 bps) ITU-T V.32bis (14,400, 12,000, 9600, 7200, 4800 bps) ITU-T V.32 (9600, 4800 bps)
  • Page 127 COMSPHERE 3821Plus Modem Model 3821 Plus Technical Specifications Specifications 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 – 4 F (– 20 C) to 158 F (70 C)

  • Page 128: Pin Assignments

    EIA-232-E Pin Assignments JM8 to RJ11 Crossover Cable NIM Cable Pin Assignments EIA-232-E Pin Assignments Table E-1 lists the EIA-232-E pin assignments for the modem. EIA-232-E Name Circuit — XTXC 3821-A2-GB20-30 Pin Assignments ............

  • Page 129: Jm8 To Rj11 Crossover Cable

    COMSPHERE 3821Plus Modem JM8 to RJ11 Crossover Cable For 2-wire leased-line connections to a JM8 network interface, an 8-position to 6-position crossover cable (see Figure E-1) must be used according to the following FCC requirements: ‘‘The RJ series of jacks should not be used for connecting data equipment to nonswitched private line networks –...

  • Page 130: Nim Cable Pin Assignments

    NIM Cable Pin Assignments Table E-2 lists the pin assignments for the 50-pin cable connected to the NIM. Carrier Slot 1 or 9 2 or 10 3 or 11 4 or 12 5 or 13 6 or 14 7 or 15 8 or 16 3821-A2-GB20-30 Table E-2...

  • Page 131: Overview

    As commands are entered from the DTE, the 3821Plus modem issues a response to the DTE which indicates if the call failed or connected, or if the command is valid or invalid.

  • Page 132: Call Request Commands

    COMSPHERE 3821Plus Modem Call Request Commands Call Request commands are issued from the DTE to the modem and are responsible for initiating any dial calls. Call Request commands include Call Request with Number Provided (CRN), Call Request with Stored Memory Address Provided (CRS).

  • Page 133: Call Answer Commands

    Call Connecting (CNX) The CNX response informs the DTE that the modem has connected to the remote modem. CNX is similar to the AT result code CONNECT. The CNX response format is CNX. Call Answer Commands Call Answer commands disable or enable the modem’s AutoAnswer function.

  • Page 134: Command Response

    COMSPHERE 3821Plus Modem Command Response A Command Response indicates that the command entered was a valid or invalid entry. Command Response includes Valid (VAL) and Invalid (INV). Valid (VAL) The VAL response indicates that the modem has accepted the V.25bis command issued by the DTE. VAL is similar to the AT result code OK.
  • Page 135 Table F-2 lists V.25bis response messages supported by the 3821Plus modem. V.25bis Command Call Failure Indication Call Connecting Indication List Stored Number Valid Command Invalid Command 3821-A2-GB20-30 Table F-2 V.25bis Response Messages Description AT Command/Result Code Equivalent CALL RESPONSE BUSY, NO ANSWER, NO CARRIER,...

  • Page 136: Equipment List

    Equipment 3821 Plus Modem Card (three modems per card) NIM with Make Busy and Service Line Features NIM without Make Busy and Service Line Features DTE Interface Assembly (8-slot, 24-port) Optional Equipment: DTE Interface Assembly (2-slot, 6-port) 66A Punchdown Block Male DB25 to 8-Pin Modular Adapter Female DB25 to 8-Pin Modular Adapter 8-Pin Modular to 8-Pin Modular Cable, 5-foot...

  • Page 137: Country-Specific Configuration Options

    Country-Specific Configuration Configuration Options by Country Code Configuration Options by Country Code Tables H-1 and H-2 show configuration options whose validity or default values vary according to country code. The abbreviations used in the table are: V for Valid I for Invalid F for Factory Default Reference to particular country codes in this guide is not an assurance that the modem has been approved for...

  • Page 138: Configuration Options By Country

    COMSPHERE 3821Plus Modem Configuration Options by Country (A through M) Strap Description DCP Choice DTR Action (&D n ) (&D n ) Stndrd_RS232 ContrlsOnHook DTR_Tx_Mute Auto Answer Ring Number Disable (S0) (S0) Dialer Type Dial Tone Detect Enable (X n )
  • Page 139 Configuration Options by Country (A through M) Strap Description DCP Choice “,” Pause Time (S8) (S8) 4 sec to 20 sec No Answer Timeout 30 sec (S7) (S7) 45 sec 60 sec 120 sec Line Crnt Disc Enab (>8 msec) (S65) (S65) Enab (>90 msec)
  • Page 140 COMSPHERE 3821Plus Modem Configuration Options by Country (A through M) Strap Description DCP Choice No Data Disc (\T n ) (\T n ) 10 min 30 min 60 min Disable V= Valid I = Invalid F = Factory Default Table H-1...
  • Page 141 Configuration Options by Country (A through M) Strap Description DCP Choice Dial TX Level PERMISSV (–9) (&I n &J n ) (&I n , &J n ) 0 dBm –1 to –4 dBm –5 dBm –6 dBm –7 dBm –8 dBm –9 dBm –10 dBm –11 dBm...
  • Page 142 COMSPHERE 3821Plus Modem Configuration Options by Country (A through M) Strap Description DCP Choice Leased TX Level 0 dBm (S45) (S45) –1 dBm –2 to –5 dBm –6 dBm –7 dBm –8 dBm –9 dBm –10 dBm –11 dBm –12 dBm –13 dBm...
  • Page 143 Configuration Options by Country (N through Z) Strap Description DCP Choice DTR Action (&D n ) (&D n ) Stndrd_RS232 ContrlsOnHook DTR_Tx_Mute Auto Answer Ring Number Disable (S0) (S0) Dialer Type Dial Tone Detect Enable (X n ) (X n ) Disable Blind Dial Pause (S6)
  • Page 144 COMSPHERE 3821Plus Modem Configuration Options by Country (N through Z) Strap Description DCP Choice “,” Pause Time (S8) (S8) 4 sec to 20 sec 30 sec Answer Timeout Answer Timeout (S7) 45 sec 60 sec 120 sec Line Crnt Disc Enab (>8 msec)
  • Page 145 Configuration Options by Country (N through Z) Strap Description DCP Choice No Data Disc (\T n ) (\T n ) 10 min 30 min 60 min Disable V= Valid I = Invalid F = Factory Default 3821-A2-GB20-30 Table H-2 (3 of 5) AT Command —...
  • Page 146 COMSPHERE 3821Plus Modem Configuration Options by Country (N through Z) Strap Description DCP Choice Dial TX Level PERMISSV (–9) (&I n , &J n ) (&I n &J n ) 0 dBm –1 to –4 dBm –5 dBm –6 dBm –7 dBm...
  • Page 147 Configuration Options by Country (N through Z) Strap Description DCP Choice Leased TX Level 0 dBm (S45) (S45) –1 dBm –2 to –5 dBm –6 dBm –7 dBm –8 dBm –9 dBm –10 dBm –11 dBm –12 dBm –13 dBm –14 dBm –15 dBm –16 to –32 dBm...
  • Page 148 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, this area is updated with the contents of Active (Saved). Active (Saved) A nonvolatile configuration area containing the most recently saved configuration options.
  • Page 149 COMSPHERE 3821Plus Modem automatic answer A capability to respond to a call received over a dial line. automode To change modulations or rates within a modulation when modems first connect. A modem may automode to a different modulation than what it is configured for due to the limitations of the remote modem, or automode to a lower rate due to unfavorable VF line conditions during connection.
  • Page 150 configuration option Modem software that sets specific operating parameters for the modem. Sometimes referred to as straps. connector An outlet on equipment and cables that provides a connection. Canadian Standards Association. Clear to Send. A signal indicating that the modem is ready for the DTE to transmit data. Customer 1 A user-defined configuration area containing customized configuration options for a specific application.
  • Page 151 COMSPHERE 3821Plus Modem directory location Nonvolatile memory that stores up to ten telephone numbers. Each directory location can have up to 40 characters entered. Canadian Department of Communication. download A process that transfers modem firmware from a locally attached PC to a modem or allows the cloning of firmware from a local modem to a remote modem.
  • Page 152 handshaking The exchange of predetermined codes and signals (tones) to establish a connection between two modems. HDLC High-level Data Link Control. A communications protocol defined by ISO. host A computer attached to a network that shares its information and devices with the rest of the network.
  • Page 153 COMSPHERE 3821Plus Modem Originate mode The state of a modem ready to transmit a call. In a dial network, it is the modem that makes the call. In a leased-line network, it is one of two sides of the network that is selected to be the originating modem.
  • Page 154 S-registers Registers that contain information affecting modem operation. S-register commands must be preceded by the AT prefix. Sync Dial A factory preset configuration area containing configuration options most often used in synchronous dial networks. synchronous transmission Data transmission that is synchronized by timing signals. Characters are sent at a fixed rate.
  • Page 155 COMSPHERE 3821Plus Modem V.42bis ITU-T standard for data compression. V.54 ITU-T standard for local and remote diagnostic loopback tests. Voice Frequency. The part of the audio frequency range used to transmit voice sound (usually 300 Hz to 3400 Hz). This band is used by the modem for its modulated signal.
  • Page 156 “,” dial modifier (Pause), 4-3 “,” Pause Time (S8), 4-17 “;” (return to command mode), 4-4 @ (quiet answer), 4-4 Numbers 2–wire leased line connection, 2-2, E-2 3821Plus modem AT commands, 4-2 card installation, 2-4 description, 1-1 features, 1-1 operating modes, 4-1 S–registers, 4-16...
  • Page 157 COMSPHERE 3821Plus Modem O (Online Mode), 4-4 Q (Result Codes), 3-27, 4-5 recovering use of, 4-26 Sn? (Display S–register), 4-5 Sn=r (Change S–register), 4-5 using to change factory presets, 2-6 V (Result Codes Format), 3-28, 4-5 X (Extended Result Codes, Dial Tone Detect, Busy...
  • Page 158 Dial Command modifiers P (Pulse dial), 3-30 T (Tone dial), 3-30 dial command modifiers, 4-3 Dial Line Rate, 3-34 Dial Line Rate (S41), 4-19 Dial Stored Number (ATDS), 4-4 Dial Tone Detect, 3-30 dial tone detect (ATX), 4-6 dial tone wait, 4-3 Dialer Type, 3-30 dialing problems, C-3 disabled commands, 3-45...
  • Page 159 COMSPHERE 3821Plus Modem hang up (ATH), 4-4 Hidden Choice Indicators, 1-4 hook flash, 4-4 Hook Switch Control (ATH), 4-4 Identity, 3-12 Identity (ATI), 4-4 initialization strings, 4-27 DATAKIT, 4-27 synchronous leased-line applications, 4-27 V.25bis applications, 4-27 installation 3821Plus card, 2-4...

  • Page 160: A2-Gb20

    Pattern (Test branch), 3-14 Pause Time (for “,” dial modifier), 3-31 pin assignments EIA–232–E, E-1 JM8 to RJ11 crossover cable, E-2 NIM cable, E-3 primary channel, 6-1 problems echoing AT commands, C-2 fax operation, C-4 high error rates, C-4 leased line operation, C-2 modem health, C-1 modem will not answer, C-3 modem will not connect, C-3...
  • Page 161 COMSPHERE 3821Plus Modem Self (Test branch), 3-13 self-test, 3-13 AT&T9, 4-11 failure, C-1 Send Break Control, 3-42 Send Break Control (AT\K), 4-14 serial number, 4-4 Service Line, 3-47 Set Administration Password, 7-8 Set Answer Security, 7-6 Set CallBack Security, 7-7...
  • Page 162 282600...

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