Paradyne 3825Plus User Manual
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Paradyne 3825Plus User Manual

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COMSPHERE
3825 P
MODEM
LUS
USER'S GUIDE
Document No. 3825-A2-GB30-40
January 1999

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  • Page 1 COMSPHERE 3825 P MODEM USER’S GUIDE Document No. 3825-A2-GB30-40 January 1999...
  • Page 2 The 3825Plus modem connects to the Public Switched Telephone Network (PSTN) using the Universal Service Order Code (USOC) for Permissive mode, RJ11C. An RJ14C jack must be used to connect a two-line telephone to the modem. The Canadian equivalent to RJ11C is CA11A and the Canadian equivalent to RJ14C is CA14A.

  • 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 3825Plus Modem Notices January 1999 3825-A2-GB30-40...

  • 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 3825Plus Modem 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 7 United Kingdom Ringer Equivalence Number The Ringer Equivalence Number (REN) is a customer guide indicating approximately the maximum number of items of apparatus that should be connected simultaneously to the telephone line. The sum of the RENs should not exceed four. This value includes any BT-provided instrument which may be assumed to have a REN of 1 unless marked otherwise.
  • Page 8 COMSPHERE 3825Plus Modem Japan Notices This equipment is in the 2nd Class category (information equipment to be used in a residential area or an adjacent area thereto) and conforms to the standards set by the Voluntary Control Council for Interference by Information Technology Equipment aimed at preventing radio interference in such residential area.

  • Page 9: Table Of Contents

    ..........3825Plus Modem Front Panel and Status Indicators .
  • Page 10 COMSPHERE 3825Plus Modem 4. AT Commands and S-Registers 5. Remote Access A. Result Codes B. Troubleshooting C. Technical Specifications D. Pin Assignments E. CCITT V.25bis Dialing Commands and Responses Overview ..........
  • Page 11 Table of Contents F. Country-Specific Configuration Options Configuration Options by Country ......Glossary Index 3825-A2-GB30-40 January 1999...
  • Page 12 COMSPHERE 3825Plus Modem This page intentionally left blank. January 1999 3825-A2-GB30-40...

  • Page 13: Preface

    Objectives and Reader Assumptions This manual describes how to install and operate the 3825Plus modem. It is intended for all users of the 3825Plus modem. How to Use This Manual Chapter 1 provides information about the 3825Plus modem’s hardware and software features, including the front panel and status indicators.
  • Page 14 COMSPHERE 3825Plus Modem This page intentionally left blank. January 1999 3825-A2-GB30-40...

  • Page 15: Introduction

    The modem’s compatibility with a number of dialing methods and protocols, such as asynchronous AT commands and ITU-T V.25bis dialing, permits the 3825Plus to be used in a variety of applications and environments while also allowing control over modem configuration, dialing, and diagnostics. The modem offers two preset factory configurations containing the most often used modem settings.

  • Page 16: 3825Plus Modem Front Panel And Status Indicators

    Two factory-defined configurations and two user-defined configuration areas. 3825 Plus Modem Front Panel and Status Indicators The front panel of the 3825Plus modem is equipped with 8 LEDs (status indicators) that monitor modem activity (Figure Status Indicators (LEDs) The 3825Plus’s status indicators continuously provide...
  • Page 17 Label Color EC/SQ green Error Control/Signal Quality ON: The modem is in Error Control mode. Off: The modem is not in Error Control mode. Flashing; Predominantly ON: The modem is in Error Control mode and is receiving errors due Flashing; Predominantly Off: The modem is not in Error Control mode and is receiving errors HS/RI green High Speed/Ring Indicate...
  • Page 18 COMSPHERE 3825Plus Modem January 1999 3825-A2-GB30-40...

  • Page 19: Plus Modem Installation

    ................3825Plus Modem Package .

  • Page 20: 3825Plus Installation

    50 feet if DTE data rates exceed 19,200 bps. On/Off Customer-Supplied Cable The rear panel of the 3825Plus modem has the following switches and connectors: An ON/Off power switch. A power receptacle for ac power transformer. A 25-pin DB-25 receptacle for your computer.

  • Page 21: Dte Connection

    DB-25-S connector on the DTE. Use a small screwdriver to tighten the cable to the DTE. Dial-Line Connection Use the following procedure to connect a 3825Plus to the dial network interface. Procedure 1. Insert the 6-position, 4-conductor modular plug into...

  • Page 22: Modem Power-Up

    COMSPHERE 3825Plus Modem Modem Power-Up Once your modem is properly connected to the DTE, dial or leased lines, and ac outlet, press the modem’s rear panel power switch to the ON position. The modem begins a power-up self-test in which all front panel LEDs momentarily light (note that this also occurs on a reset of the modem), and the Power LED remains ON.

  • Page 23: Recovering At Commands

    V.25bis and synchronous operation, disable the use of AT commands and place the modem into a state known as Dumb mode. The 3825Plus is capable of normal operation when in Dumb mode. However, if the setting of a configuration option must be changed, it can only be accomplished using an AT command.

  • Page 24: Initialization Strings

    COMSPHERE 3825Plus Modem 3. To save changes, use the &W command: TYPE: AT&Wn Where: n is one of the following storage areas: 0 for Active (Saved) 1 for Customer 1 2 for Customer 2 PRESS: Enter The modem exits AT Recovery mode and returns to its previous application environment.

  • Page 25: Fax Operation

    Your 3825Plus 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 26 COMSPHERE 3825Plus Modem January 1999 3825-A2-GB30-40...

  • Page 27: 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 3825Plus modem uses three consecutive plus (+) characters as the escape sequence. (To change this value, refer to S-register S2 discussed later in Table 4-2 in the S-Register List section.)

  • Page 28: Command Guidelines

    PRESS: Enter Table 4-1 lists all AT commands supported by the 3825Plus 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 29 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 30 COMSPHERE 3825Plus Modem Dial Begins the dialing sequence. The dial string n (modifiers and telephone number) is entered after the D command. Any digit 0–9, * , # , A, B, C, D, may be dialed as a DTMF tone. Only the digits 0–9 can be dialed in Pulse Dial mode.
  • Page 31 Hook Switch Control Allows the modem to go off-hook or on-hook. H, H0 Modem goes on-hook. Modem goes off-hook. Identification Provides useful information when upgrading or servicing the product. I, I0 Displays product code (default is 144). Displays 3-digit firmware revision number. Performs an EPROM check.
  • Page 32 COMSPHERE 3825Plus Modem 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 Table A-1 for a list of result codes. Q, Q0 Enables modem to send result codes to the DTE.
  • Page 33 X n , continued Add/EC. If error control is negotiated, attaches the /EC suffix to the CONNECT rate message. Add/V42,MNP. Attaches the V42b, V42, MNP5, MNP4, MNP3, MNP2, or NoEC suffix to the CONNECT rate message. Use DTE Rate. Displays DTE data rate instead of line CONNECT rate message. DIAL TONE DETECT Sets the modem for dial tone detection (enable) or blind dialing (disable).
  • Page 34 COMSPHERE 3825Plus Modem &&P1 Clone Remote Copies the firmware from the modem that receives the command to another 3825 Plus modem. The modem must be in Online Command mode. (Online Command mode is established with the +++ escape sequence.) The initial response to...
  • Page 35 &F n Select Factory Default Configuration Options Loads factory configuration options into the Active (Operating) area. The &F5 and &F6 commands are valid only if ETC is installed. &F0 Async Dial &F3 UNIX Dial &F5 Cellular (Mobile) &F6 Cellular (PSTN) If ETC is installed and your modem is attached to a cellular telephone, use the &F5 command to configure the modem for cellular communications.
  • Page 36 COMSPHERE 3825Plus Modem &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 causes the level to be varied automatically according to conditions for Enhanced Throughput Cellular (ETC) operation.
  • Page 37 &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. &M1, &M3, &Q1, &Q3 Modem operates in Synchronous mode and uses AT Command protocol.
  • Page 38 COMSPHERE 3825Plus Modem &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 39 &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. &X2 Receive Clock Loop.
  • Page 40 COMSPHERE 3825Plus Modem %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.
  • Page 41 \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. SEND BREAK CONTROL Determines what is sent from the modem first, data or break if a break sequence is sent from the DTE.
  • Page 42 COMSPHERE 3825Plus Modem \T n No Data Disconnect Timer Forces the modem to disconnect if no data is transmitted or received within a specified amount of time. \T, \T0 Disable. \T2 is the default for Denmark, and \T3 is the default for France and Germany. See Appendix F.

  • Page 43: S-Register List

    S-Register List S-registers affect the operating parameters of the 3825Plus 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 44 COMSPHERE 3825Plus Modem Line Feed Character Determines ASCII value used as the line feed character. Enter a value from 0–127 for the line feed character. The factory setting is 10 (ASCII line feed). 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 45 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 The factory setting is Enable. Test Timeout Sets the duration (in seconds) for the modem tests.
  • Page 46 COMSPHERE 3825Plus Modem 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)
  • Page 47 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) 3 = 9600 (V.32bis) 4 = 7200 (V.32bis) 5 = 4800 (V.32bis) 6 = 2400 (V.22bis)
  • Page 48 COMSPHERE 3825Plus Modem 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:...
  • Page 49 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 The factory setting is Mark. V.25bis New Line Character Identifies to the modem the type of line terminator used by the DTE while in V.25bis Async mode.
  • Page 50 COMSPHERE 3825Plus Modem Network Position Identification Register identifies each modem as either a control or tributary modem. Register has the following values: 0 = Tributary 1 = Control The factory setting is Tributary. Network Management Address Register determines the modem’s network address. This address is used when accessing the modem from the NMS.
  • Page 51 No Data Disconnect Trigger Signal Register determines whether Pin 2 (transmit data) or Pin 3 (receive data) of the modem’s RS-232 serial interface is monitored so that the modem can disconnect the call if there is no activity for a certain period. (See the \T command.) Register has the following values: 0 = Transmit or Receive 1 = Transmit only...

  • Page 52: A2-Gb30

    COMSPHERE 3825Plus Modem V.42 ARQ Window Size Increase Register allows the V.42 Automatic Request for Transmission (ARQ) window size to be set to a value from 6 to 15 frames to accommodate satellite delays. Register has the following values: 0 = Automatic Adjust (6 –15 frames)

  • Page 53: Security

    Originate Security An Originate Access password is entered by a local user to gain access to a local 3825Plus 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 54 COMSPHERE 3825Plus Modem 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...
  • Page 55 User A dials this modem by following the phone number with a wait dial modifier and the VF password 12345678, and is not prompted for a DTE password. User B dials this modem by following the phone number with a wait dial modifier and the VF password 87654321, and is prompted for a DTE password.
  • Page 56 COMSPHERE 3825Plus Modem Callback Security Determines whether Callback Security is used. 0 = Disable 1 = Enable (not valid if S68=0) The factory setting is Disable. Answer Security Determines whether and which type of Answer Security is used. 0 = No Answer Security...
  • Page 57 DTE Password Termination Character Determines ASCII value used to indicate the end of a password or Callback Directory/Number entered by the remote user. Enter a value from 1–63 or 123–127 for the command end character. The factory setting is 13 (ASCII carriage return). DTE Password Backspace Character Determines ASCII value used as the backspace (Backspace key) when entering a password or Callback Directory/Number.
  • Page 58 COMSPHERE 3825Plus Modem This page intentionally left blank. 4-32 January 1999 3825-A2-GB30-40...

  • Page 59: Remote Access

    Overview The Remote Access feature of 3800Plus modems allows you to change configuration options and control test functions in a remote 3825Plus modem from any COMSPHERE 3800, 3800Plus, or 3900 Series modem with a Diagnostic Control Panel (DCP). Remote DCP access is only available when using V.34, V.32terbo,...
  • Page 60 3825Plus 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 61: Result Codes

    ................Overview Table A-1 lists all the result codes 3825Plus modems may send to the DTE. Result codes can be numeric or verbal, terse or extended. See the Qn, Vn, and Xn commands in Chapter 4 for more information.
  • Page 62 COMSPHERE 3825Plus 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 63 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. *** 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.
  • Page 64 COMSPHERE 3825Plus Modem 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 65: Troubleshooting

    If problems continue to occur, contact your service representative. If you would like to download the latest 3825Plus firmware from the Automatic Firmware Download Center, see the instructions at the end of this chapter. If you would like to copy the software in your modem to a remote 3825Plus modem, see the &&P command in...
  • Page 66 COMSPHERE 3825Plus 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 67 Symptom Modem goes off-hook, Verify that originating modem supports your modem’s modulation schemes. The 3825 Plus answers, but does not modem recognizes V.34, V.32 terbo, V.32bis, V.32, V.22bis, V.22, V.21, Bell 212A, and connect (continued) Bell 103J. It does not support other vendors’ proprietary modulation schemes. Use the S41 register to force your modem to operate at the same modulation scheme as the originating modem.
  • Page 68 COMSPHERE 3825Plus Modem Symptom Modem establishes and You may have a poor VF connection. Disconnect and dial again. disconnects a call disconnects a call The remote modem may have encountered an EC Disconnect, where the modem is configured to establish a call using error correction.

  • Page 69: Automatic Firmware Download

    Automatic Firmware Download New releases may be available for the 3825Plus modem. The latest 3825Plus 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 70 COMSPHERE 3825Plus Modem This page intentionally left blank. January 1999 3825-A2-GB30-40...

  • Page 71: Technical Specifications

    Technical Specifications Model 3825 Plus Technical Specifications Specifications APPROVALS Refer to the label on your modem or contact your local 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 72 COMSPHERE 3825Plus Modem Model 3825 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 73: Pin Assignments

    EIA-232-E Pin Assignments JM8 to RJ11 Crossover Cable EIA-232-E Pin Assignments Table D-1 lists the EIA-232-E pin assignments for the modem. RS-232 Name Circuit — XTXC 3825-A2-GB30-40 Pin Assignments ............

  • Page 74: Jm8 To Rj11 Crossover Cable

    COMSPHERE 3825Plus 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 D-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 75: Overview

    As commands are entered from the DTE, the 3825Plus modem issues a response to the DTE which indicates if the call failed or connected, or if the command is valid or invalid.

  • Page 76: Call Request Commands

    COMSPHERE 3825Plus 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 77: 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 78: Command Response

    COMSPHERE 3825Plus 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 79 Table E-2 lists V.25bis response messages supported by the 3825Plus modem. V.25bis Command Description Call Failure Indication Call Connecting Indication List Stored Number Valid Command Invalid Command 3825-A2-GB30-40 CCITT V.25bis Dialing Commands and Responses Table E-2 V.25bis Response Messages AT Command/Result Code Equivalent...
  • Page 80 COMSPHERE 3825Plus Modem January 1999 3825-A2-GB30-40...
  • Page 81 Country-Specific Configuration Configuration Options by Country Code Configuration Options by Country Code Tables F-1 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 82 COMSPHERE 3825Plus 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 83 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 84 COMSPHERE 3825Plus 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 F-1...
  • Page 85 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 86 COMSPHERE 3825Plus 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 87 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 88 COMSPHERE 3825Plus 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 89 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 3825-A2-GB30-40 Table F-2 (3 of 5) AT Command —...
  • Page 90 COMSPHERE 3825Plus 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 91 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 92 COMSPHERE 3825Plus Modem This page intentionally left blank. F-12 January 1999 3825-A2-GB30-40...
  • Page 93 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 94 COMSPHERE 3825Plus Modem 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 95 Customer 1 A user-defined configuration area containing customized configuration options for a specific application. Customer 2 A user-defined configuration area containing customized configuration options for a specific application. data bank An area within the modem used to store the modem’s firmware. data carrier A continuous frequency signal that can be modulated by another signal that contains information to be transmitted.
  • Page 96 COMSPHERE 3825Plus Modem DTMF Dual Tone Multi-Frequency. DTMF tones are the sounds produced by pressing the keys of a Touch Tone phone, or by dialing a number with a modem using the ATDTn command. Electronic Industries Association. This organization provides standards for the data communications industry.
  • Page 97 leased line A private line connection exclusively for the user. No dialing is necessary. Light-Emitting Diode. A light or status indicator on the DCP that glows in response to the presence of a certain condition (e.g., Alrm). local analog loopback The modem’s transmit VF signal is looped to its receiver.
  • Page 98 COMSPHERE 3825Plus Modem register A part of the modem’s memory that contains values that determine the modem’s operating characteristics. remote loopback A test that sends a signal to the remote modem to test the local modem, the remote modem, and the circuit between them.
  • Page 99 V.32bis A standard for modems operating full-duplex with asynchronous or synchronous data over dial networks (PSTN) or leased lines at 14,400, 12,000, 9600, 7200, or 4800 bps. V.32terbo A proprietary standard for modems operating full-duplex with asynchronous or synchronous data over dial networks (PSTN) or leased lines at 19,200 or 16,800 bps.
  • Page 100 COMSPHERE 3825Plus Modem Glossary-8 January 1999 3825-A2-GB30-40...
  • Page 101 ! (hook flash), 4-4 “,” dial modifier (Pause), 4-4 “,” Pause Time (S8), 4-18 “;” (return to command mode), 4-4 @ (quiet answer), 4-4 Numbers 3825Plus modem AT commands, 4-2 description, 1-1 features, 1-1 operating modes, 4-1 S-registers, 4-17 A/ (Repeat Last Command), 4-3...
  • Page 102 COMSPHERE 3825Plus Modem AT commands, continued Y (Long Space Disconnect), 4-7 Z (Reset and Load Active), 4-7 AT&T exclusive dialing, 2-6 auto-answer problems, B-2 Automatic Firmware Download Center, B-5 automatic redialing, 4-19 automode (S78), 4-24 autorate S76 Dial Line, 4-24...
  • Page 103 1-2 initialization strings, 2-6 DATAKIT, 2-6 synchronous leased-line applications, 2-6 V.25bis applications, 2-6 installation 3825Plus modem, 2-2 software, 2-3 ITU-T/Bell Mode (B command), 4-3 JM8 to RJ11 crossover cable, 2-3, D-2 3825-A2-GB30-40 Leased Line Carrier On Level (S48), 4-21...
  • Page 104 COMSPHERE 3825Plus Modem quiet answer, 4-4 R (Reverse dial), 4-4 recovering use of AT commands, 2-5 redialing, automatic, 4-19 remote access (S55), 4-22 Remote Access Password, 4-22 Remote branch, 5-1 remote modem Top-Level menu, 5-2 Repeat Last Command (A/), 4-3...
  • Page 105 UNIX, factory default for, 4-9 upgrade instructions, B-5 V.21 or V.22 modulation, 4-3 V.25bis applications, 2-6 V.25bis Coding (S62), 4-22 V.25bis dialing, 4-11 V.25bis dialing commands, E-1 V.25bis Idle Character (S63), 4-23 V.25bis New Line Character, 4-23 V.29 Train On Data (S92), 4-26 V.32bis Automode (S78), 4-24 V.32bis Autorate (Dial Line), 4-24 V.32bis Autorate (Leased Line), 4-25...
  • Page 106 COMSPHERE 3825Plus Modem This page intentionally left blank. Index-6 January 1999 3825-A2-GB30-40...
  • Page 107 282600...

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Comsphere 3825plus

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