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3Com Courier Reference

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Part No. 1.024.2129-01
Published June 2000
Courier
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Modem Command
Reference
V.Everything

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  • Page 1 Courier Modem Command ® Reference http://www.3com.com/ Part No. 1.024.2129-01 Published June 2000 V.Everything...
  • Page 2 You agree not to remove or deface any portion of any legend provided on any licensed program or documentation contained in, or delivered to you in conjunction with, this User Guide. 3Com, the 3Com logo, and V.Everything are registered trademarks and Courier and V.Everywhere are trademarks of 3Com Corporation.

  • Page 3: Table Of Contents

    ONTENTS BOUT UIDE Introductio Conventions Related Documentation ONNECTING TO YOUR Windows 95 /981-1 What You Ne ed1-1 Configuring Your modem with Plug and Follow the steps below to install the INF file for Windows 9 Installing the Latest Softwar Accessing Your Internet Service Provid Step One: Determine if Dial-Up Networking is Installed Step Two: Installing Dial-Up TCP/IP Support1- Step Three: Setting Up a Connection to Yo...
  • Page 4 Displaying S-Register setting Setting an S-Register Getting a list of S-Register Understanding bit-mapped S-Regi PGRADING YOUR MODEM Checking Your Courier V.Everything Modem’s Software Ve Getting New Operating Softwa Sending New Software to your mod If Your Modem Doesn’t Respon Remote Flash...
  • Page 5 Making International cal ls5- Handshaking opt ions5-5 Guard tone Call Detection Caller ID Functions Service Types Applications of Caller ID Technol How the Courier V.Everything Modem Handles Cal Presentation Formats Command s5-8 References Distinctive Ring Sup port5-9 Command s5-1 Result Code...
  • Page 6 Carrier Detec t8-3 CCESSING AND ONFIGURING THE ODEM REMOTELY Overview Setting Up Remote Acces At the Host Courier V.Everything Mod Other Remote-Access Command Accessing the Hos t9-3 At the Guest Device Viewing and Changing the Host’s Configurat Remote Configuration Comma...
  • Page 7 Password Prompting Maintaining Security Accoun Remote Configurati on11-8 What the Guest User Needs to Do Configuring Dial Security Remote Dialing In From the Remote S DTMF Securit y11-1 LOW CONTROL Overview 12-1 Hardware and Software Flow Con Hardware Flow Contro Software Flow Contro l12- Received Data Flow Contro...
  • Page 8 Overview 16-1 Requirement s16-2 A Device with a Synchronous Serial Port A Serial Cabl e16- Communications Softw Synchronous Operatio Configuring the Courier V.Everything Modem for Leased Line Operation 16-3 Dial Using V.2 bis Softwar on13-8 hput13-9 hen:13-9 ELP SCREENS 15-2...
  • Page 9 17-3 Hear ringing but the Courier V.Everything modem won't an The Courier V.Everything modem acts as though a data link has been established, but no call was receive The Courier V.Everything modem behaves as if Enter were pressed when...
  • Page 10 Converting Decimal Values to Bi Setting Bit-Mapped S-Register Using Bi tsA-3 Using Decimal Value sA-3 Default S-Register Setti ngsA-3 A complete list of S-Registers LPHABETIC OMMAND Basic Command S etB-1 Ampersand (&) Command Percent (%) Command Set Octothorpe (#) Command S ONTROL EMPLATE Hardware Flow Contro...
  • Page 11 ASCII C HART NFORMATION FOR Fax Service Class 1 Comman FAX Service Class 2.0 Comman Fax Mode Flow Control Setti FCC Noti ceH-2 Notes LOSSARY ROGRAMMERS dsH-1 dsH-1 ngH-2...

  • Page 13: About This Guide

    Introduction This guide is a command reference for the Courier V.Everything modem. It includes information about AT commands, S-Registers and troubleshooting If the information in the release notes shipped with your product differs from the information in this guide, follow the instructions in the release notes.

  • Page 14: Related Documentation

    Words in italicised type Words in bold-face type Related The Courier V.Everything Getting Started Guide should be used for the Documentation installation of the Courier V.Everything modem. Description The word “command” means you must enter the command exactly as shown in text and press the Return or Enter key.

  • Page 15: Connecting To Your Isp

    This chapter contains information about configuring your modem for various operating systems. Windows 95/98 The first time you start Windows 95/98 after you’ve installed the modem, Windows 95/98 will auto-detect your modem. Since Windows 95/98 supports Plug and Play, most installations are trouble-free. You must power on your modem before you start Windows 95/98, or Windows 95/98 will not recognise your modem.
  • Page 16 1: C HAPTER ONNECTING TO YOUR 3 When the following window appears, insert your Connections CD-ROM, change the default drive in Copy Manufacturer’s files from: to the correct path of your CD-ROM) and click OK to install the INF file.

  • Page 17: Installing The Latest Softwar

    Your modem is now ready to use! Installing the Latest See Chapter 3, Upgrading your Mode Softwar your Courier V.Everything modem’s software. Accessing Your This section explains how to set up your modem to access the Internet or Internet Service...

  • Page 18: Step Two: Installing Dial-Up Tcp/Ip Support1

    Windows 95/98 installs Dial-Up Networking. Step Two: Installing Dial-Up TCP/IP Support 1 Click Start | Settings | Control Panel. 2 On “Control Panel,” double-click the Network to display the “Network” window: 3 Determine if the TCP/IP Dial-Up Adapter is installed: IF TCP/IP ->...

  • Page 19: Step Three: Setting Up A Connection To Yo Ur Isp1-5

    IF TCP/IP -> Dial-Up Adapter Is listed Step Three: Setting Up a Connection to Your ISP 1 Click Start | Programs | Accessories | Dial-Up Networking. 2 Double-click Make New Connection. 3 Select the correct modem, if not already selected. 4 Type a name for the connection and click Next.
  • Page 20 The following screen may vary slightly depending on the version of Windows 95/98 you are using. 9 On the “My Connection” window, click the Server Type tab, and deselect the following: Log on to Network NetBEUI IPX/SPX Compatible...

  • Page 21: Step Four: Customizing The Tcp/Ip Sett Ings1-7

    10 Click OK, and OK. If your ISP Do this Gives you a specific IP Go to Step Four: Customising TCP/IP Settings or Domain Name server addresses Does not give you a Double-click on the icon you just created to dial your ISP. specific IP or Domain Name server addresses Step Four: Customising the TCP/IP Settings...
  • Page 22 1: C HAPTER ONNECTING TO YOUR 5 Specify an IP address, if needed: If your ISP Gives you a specific IP address Does not give you a specific IP address 6 After you specify an IP Address, select which is appropriate: If your ISP Gives you specific name server addresses...

  • Page 23: Windows Nt 4.0

    Windows NT 4.0 TCP/IP is the main protocol used to transfer data via the Internet. To use TCP/IP with Windows NT 4.0, you must connect to your ISP using a PPP or SLIP connection Each ISP has different requirements. Before using this chapter to configure Windows NT 4.0 to access your I S P, contact your ISP to determine if they have special instructions for Windows NT 4.0 users For you to...

  • Page 24: Setting Up Ra

    6 Highlight your Courier V.Everything modem and click Configure. 7 Select the function of your modem and click OK. 8 Click Network 9 Select the protocols required to dial in and out with your Courier V.Everything modem. 10 Set Encryption Settings to Allow any authentication including clear text.

  • Page 25: Installing Tcp/I P1-11

    3 On the Protocol tab, click Add, and select the TCP/IP protocol from the list. Configuring a PP To configure the Courier V.Everything modem for a PPP connection, perform the following actions: connection 1 Go to Start | Programs | Accessories | Dial Up Networking.

  • Page 26: Configuring A Slip Connect Ion1-1

    In the phone book settings, under security, select Accept any authentication including clear text. Make sure only the necessary network protocols are selected In the Connect to window, after you click Dial, there should be no domain set. This is only for logging into NT domains.

  • Page 27: Other Operating System S1-14

    UNIX, Linux, or AI communications software package, see the software’s installation procedure. To set your Courier V.Everything modem to answer incoming calls, set DIP switch 3 OFF; set 4 and 8 ON. Make sure that the TCP/IP settings are correct.
  • Page 28 1-14 1: C HAPTER ONNECTING TO YOUR...

  • Page 29: Sing The At Command

    This chapter includes information about Overview You can use AT commands to change your modem settings at any time. To send AT commands to your modem, you need to put your communications software in Terminal Mode. In terminal mode, what you type is sent directly to the modem.

  • Page 30: Basic At Command S2-2

    2: U AT C HAPTER SING THE AT&K3X2DT5551234 &K3 Hyphens and parentheses add to the count of 56 characters but spaces do not. Basic AT commands The command AT informs the modem that a command is coming. AT must precede all commands except A/, A> and +++. To configure your modem to Re-execute the last-issued command.

  • Page 31: Using S-Register S2-2

    Settings for a register in the current configuratio Example: Sending setting will cause the Courier V.Everything modem to answer, in Auto Answer Mode, on the second ring. In the command ATSr=n, r is the register's number and n is a decimal value from 0-255 (unless otherwise indicated) that specifies the setting.

  • Page 32: Getting A List Of S-Register S2-4

    2: U AT C HAPTER SING THE Getting a list of S-Registers To display A list of S-Registers In order to issue this command, you must be in Terminal Mode. See Appendix A, S-Registers for a complete list of S-Registers. Understanding A bit-mapped S-Register uses one number to describe a collection of bit-mapped...

  • Page 33: Upgrading Your Modem

    This chapter contains information about: Checking Your Issuing the Courier on your terminal screen V.Everything Modem’s Software ati7 Version 3Com Courier V.Everything Configuration Profile... Product type Product ID Options Fax Options Clock Freq Flash ROM Supervisor date DSP date Supervisor rev...

  • Page 34: Getting New Operating Softwa Re3-2

    3: U HAPTER PGRADING YOUR MODEM Getting New To get the newest version of the Couri e r V.Everything modem’s operating Operating Software software: Sending New To send the new code to your modem, all you need is a standard terminal Software to your program that can send files using the XMODEM protocol.

  • Page 35: If Your Modem Doesn't Respon D3-3

    1 Power your modem on. 2 Start your communications software package. Set your port speed to 57,600 bps, type If the Courier V.Everything modem reports .bootmodem., it is corrupt. Issue the previous page. 3 Power your modem off 4 Set the DIP switches to their previous settings.
  • Page 36 3: U HAPTER PGRADING YOUR MODEM...

  • Page 37: Odes Of Operation

    Control the modem using AT Command Mode commands Depending on how DIP switch 9 is set, sending the escape code (+++) will return the Courier V.Everything modem to Command Mode or hang up. To be able to change operating modes without losing connections, set DIP switch 9 down.

  • Page 38: Entering Online Command

    4: M HAPTER ODES OF PERATION Entering Online When the modem is in Online Mode, the only command it recognises is Command Mod an escape code, or +++. Revert to Command Mode without losing connections by using settin DIP switch 9 down or sendin establishing your connection.

  • Page 39: Online-Mode Local Echo4-3

    Online-Mode Local To configure your modem to display a copy of data that is bein Echo transmitted on your screen you can use the ATFn command. As the modem transmits data to a remote system The modem sends a copy of the data to the screen. Online local echo ON (half duplex).
  • Page 40 4: M HAPTER ODES OF PERATION Class 1 and Class 2.0 Fax Modes refer to standards set by the Electronic Industries Association/Telecommunications Industry Association. Class 1 Fax Mode is the minimal standard for computer-faxmodem interface. Class 2.0 Fax Mode refers to the extended computer-faxmodem interface. If you are not sure whether your modem is in Data or Fax mode, use the AT+FCLASS? If the modem...

  • Page 41: Dialing , Answering , And

    This chapter explains how to use basic AT commands for: Dialing You can use your modem to dial the specified telephone number an execute dial options by using the following commands. Dial options IALING NSWERING ANGING Dialing Carrier loss redial Answering calls Making International calls Call detection...
  • Page 42 5: D HAPTER IALING NSWERING For your modem to Wait for an answer (with X3 or higher). Some online services answer the phone and return a tape-recorded request for information before processing transactions. Use the AT@ command to tell the modem to detect at least one ring, wait for five seconds of silence at the other end of the call, and then continue.

  • Page 43: Carrier Loss Redial

    Example: Sending the connection and redialing. Answering Call Your modem can be configured to answer calls. By default, your Courier V.Everything modem will not automatically answers calls sets a 20-second interval between losing ATS44=20 Carrier Loss Redial Command >...

  • Page 44: Force Answer Mode

    Manually answer a call Auto Answer You can set your modem to Auto Answer using the ATS0 command For all Courier V.Everything modems except the PC card version, DIP switch 5 overrides the ATS0=n setting. For your modem to Receive calls unattended (Auto answer enabled) Remember to set your communications software to save incoming messages and/or files.

  • Page 45: Making International Cal

    No guard tone 550-Hz guard tone 1800-Hz guard tone If you set &G2 you must also sen allows the Courier V.Everything modem to answer all calls from overseas. , will allow your modem to use Bell answer tone ATB1 Command AT&G0...

  • Page 46: Call Detection

    If a call arrives without a Caller ID signal, the modem will send OUT OF AREA in place of the phone number and name. If the Caller ID information has been blocked by the user at the other end, the Courier V.Everything modem will send PRIVATE in place of the phone number and name.

  • Page 47: How The Courier V.everything Modem Handles Cal

    The information remains in memory until either you reset the modem or until it receives another valid Caller ID signal. To be sure that the Courier V.Everything modem receives the Caller ID signal when auto-answer is enabled, set S0=2 or higher or make sure...

  • Page 48: Presentation Formats

    IALING NSWERING Presentation Formats The Courier V.Everything modem sends the Caller ID information to your computer formatted or unformatted. Formatted presentation is a translation of the Caller ID signal into ASCII text. Unformatted presentation is a hexadecimal representation of the Caller ID signal...

  • Page 49: References

    Enable Caller ID with formatted output and name suppressed Enable Caller ID but do not transmit the information to your computer—retain it in the Courier’s memory Display the current caller ID setting. Display the Caller ID settings that are available References For more information about Calling Number Delivery (CND), refer t Bellcore documents TR-TSY-000030 and TR-TSY-000031.

  • Page 50: Command S5-1

    Example: Sending recognition of ring types A and D only. When a call comes in with a ring type A or D, the Courier V.Everything modem will send the result code RING A or RING D, respectively. The Courier V.Everything modem will ignore other ring types.
  • Page 51 If more than one ring type is enabled, the Courier V.Everything modem will recognise only the enabled ring types and ignore the others. When a call arrives, the Courier V.Everything modem will send its ring type in the result code, for example, RING C.
  • Page 52 5-12 5: D HAPTER IALING NSWERING Result Codes Verbal RING A RING B RING C RING D RING E ANGING Numeric...

  • Page 53: Working With Memory

    See Chapter 3, Upgrading your Software, for more information about performing a software downloads. Overview Courier V.Everything modems contain three types of memory that you can interact with: random access memory (RAM), nonvolatile rando access memory (NVRAM), and Flash memory.

  • Page 54: Working With Ram And Nvra M6-2

    If you want the new setting to be a default, write it to NVRAM at the same time. From the example above, you would send modem. The new default setting for your Courier V.Everything modem will only allow a 14400 bps connection to a remote device.

  • Page 55: Saving A Phone Number To Nvr Am6-2

    If the call requires a special setting, insert it in the command before the DSn command. In this example, &M0 (no error control) comes before DS2. Type: The AT&Zn=s command functions differently when Dial Security is enabled. See Chapter 11, Dial Securit , for more information. Displaying S-Register Value Information For your modem to...

  • Page 56: Working With Flash Memory

    ATS32=9 diagnostic screen whenever the voice/data switch is pressed. Working with Flash The Courier V.Everything modem permanently stores three configuratio Memory "templates," or prepared sets of commands, in Flash memory. You can use the &Fn command to load one of the three configuration templates from Flash memory into current memory.

  • Page 57: Default Settin Gs6-5

    DIP switch settings override AT commands at power on. Make sure DIP switch 10 is OFF, or the &F0 template will be loaded Default Settings When the Courier V.Everything modem is turned on, it loads the settings stored in NVRAM. By default, these settings are that same as the &F1 template.
  • Page 58 6: W HAPTER ORKING WITH MEMORY...

  • Page 59: Controlling Result Code Displays

    The commands listed below control whether result codes are displayed, Commands and in what format they are displaye For all Courier V.Everything modems, except the PC card version, DIP switch 3 overrides the Qn setting, DIP switch 2 overrides Vn setting, and DIP switch 7 overrides the S14.1=n setting.

  • Page 60: Additional Result Code Sub Sets7-2

    This setting pertains only to the display of codes and not to ARQ function. Display ARQ result codes. If the Courier V.Everything modem is set to X0 and the connection rate is 1200 bps-56 Kbps, a result code is displayed.

  • Page 61: Controlling Eia-232 Signaling

    This chapter contains information about configuring the EIA-232 signalling between your computer and modem: Data Terminal Your computer sends a Data Terminal Ready (DTR) signal to the Courier Ready V.Everything modem when it is ready to send and receive data. The &Dn command tells the modem how to respond to the DTR signal.

  • Page 62: Data Set Ready

    DIP switch 1 overrides the &Dn setting at power on or reset. Data Set Ready Under normal conditions, the Courier V.Everything modem sends a Data Set Ready (DSR) signal to your computer when it is ready to send and receive data.

  • Page 63: Carrier Detec T8-3

    Carrier Detect (CD) signal in response to esablishing a connection with another modem. You can use the AT&Cn command to control how the Courier V.Everything modem sends the CD signal. For your modem to Have CD always ON.
  • Page 64 8: C EIA-232 HAPTER ONTROLLING SIGNALING...

  • Page 65: Ccessing And Odem Remotely

    This chapter contains information about: Overview You can set up the Courier V.Everything modem so other devices ca view or change its configuration remotely. You should be familiar with these terms before you continue: Local Remote Host Guest Setting Up Remote...
  • Page 66 View and change the Courier V.Everything modem’s configuration. Example: Sending the password corn. The user can view and change the Courier V.Everything modem’s configuration. Remote-access passwords can be up to eight alphanumeric character long, and are not case-sensitive ONFIGURING THE...

  • Page 67: Other Remote-Access Command

    43. See Appendix A, S-Registers for more information. Command AT%P0? AT%P1? AT%P0= AT%P1= ATS41=0 will erase the view and change password AT%P1= ), anyone could access the Courier V.Everything ATS41=0 ). Know the password, if you will need one. ATS0=1 Accessing the Host...
  • Page 68 OURIER VERYTHING ODEM REMOTELY 4 You should see a display similar to this: 3Com Courier V.Everything Remote Access Session Serial Number 000000A000000001 Password (Ctrl-C to cancel)? There is a 3-minute time limit for entering the password. If the number of...
  • Page 69 There are special commands that can be used only during a Configuration remote-access session. Commands You can change the host Courier V.Everything modem’s serial port rate by using the AT%B n command. To change the host Courier V.Everything modem’s serial port...
  • Page 70 9: A HAPTER CCESSING AND You can use the AT%Fn command to control the data format. To change the data format to No Parity (8 data bits) Mark parity (7 data bits) Odd Parity (7 data bits) Even parity (7 data bits) You can use the AT% n command t control whether and when to apply changes to the configuration For your modem to...

  • Page 71: Quitting A Remote-Access Sessi On9-7

    If you restore the original configuration using the AT%C1 command, the first prompt is restored, assuring you the original configuration is intact. Quitting a If you want to quit the remote-access login before you have entered the Remote-Access password, return online by pressing <Ctrl>C or typing ATO. Session After you’ve entered the password, you can quit by sending one of these commands:...
  • Page 72 9: A HAPTER CCESSING AND ONFIGURING THE OURIER VERYTHING ODEM REMOTELY...

  • Page 73: Controlling Data Rates

    Serial Port Rates You set a fixed serial port rate to get the highest possible throughput an the best performance. Set a variable rate to allow the Courier V.Everything modem to match the connection rate. Your software must support fixed or variable serial port rates.
  • Page 74 Courier V.Everything modem connects in ARQ mode. If the connection is not under error control, the Courier V.Everything modem behaves as if it was set to &B0 and switches its serial port rates to match the connection rate of each call.

  • Page 75: Connection Ra Tes10-3

    Connection Rates You can set the Courier V.Everything modem to a fixed or variable connection rate for data calls. Set a variable rate to have the Courier V.Everything modem negotiate with the remote device for the highest possible connection rate. Set a fixed rate to connect only at a specifie rate.

  • Page 76: Controlling Link Speeds With &N A

    The &N command allows you to specify the connect speed. If a remote Connect Speed modem attempts to connect to your Courier V.Everything modem at a speed different from &N, your Courier V.Everything modem will not allow it to connect.

  • Page 77: N And &U Command Val Ues10-5

    The link speed associated with the &U argument CANNOT be greater than the link speed associated with &N argument. Use the following table to understand the relationship between &U and &N commands If &U Equals zero Equals zero Is greater than zero Is greater than zero &N and &...
  • Page 78 53333 54666 56000 57333 Configuring the You can configure your Courier V.Everything modem to alert you when it High Speed LED reaches 56K speeds. Use the following S69 setting to configure the HS (High Speed) LED: To do this Configure the HS LED to turn red when your modem reaches speeds over 33.3 kbps.

  • Page 79: Setting Dte Rate To 230 K Bps10-7

    Setting DTE Rate to The DTE rate of your Courier V.Everything modem has been increased to 230 Kbp 230 kbps to enhance throughput. Your modem must be attached to a serial port capable of this speed to achieve this rate.
  • Page 80 10-8 10: C HAPTER ONTROLLING DATA RATES...

  • Page 81: Dial Security

    The device at the other end of a telephone connection. The Courier V.Everything mode and controlled by other devices. The device that will access and control the host Courier V.Everything modem. Autopass Password Promptin that will be accessed...

  • Page 82: Setting Up Dial Security

    11-2 11: D HAPTER IAL SECURITY Setting up Dial Here is a summary of the steps for setting up Dial Security: Security 1 Set up an account for yourself. Use any of the 10 available accounts (numbered 0-9) for your account. Use the AT%An command to set up user accounts.

  • Page 83: Dialback Optio Ns11-3

    Dialback options You can set the Courier V.Everything modem to automatically dial back a certain number after a client modem dials in. Count your commas! There should always be at least four commas in the %A command. Do not insert spaces between commas or between fields and commas.

  • Page 84: Modifying Acco Unts11-4

    You must use the &W command to save the settings in NVRAM. If you don’t, the next time you reset or power off the Courier V.Everythin modem, Dial Security will be disabled. 5 Decide which Dial Security option to use.

  • Page 85: Autopass Prompti Ng11-6

    If the guest includes a valid password, the host permits a secure connection. If the guest did not enable Dial Security, the host will not accept the call unless prompting is enabled on the host Courier V.Everything mode . Setting up Dial Security When using Password Prompting Guest devices don’t have to support...
  • Page 86 You must use the &W command to save the settings for Enablin Autopass Dial Security and Dial Security with Password Prompting. If yo don’t, the next time you reset or power off the Courier V.Everythin modem, Dial Security will be disabled.

  • Page 87: Remote Configurati On11-8

    Example: Sending When using the AT%S= command, the device echoes the administrative password, which is case-sensitive. Courier V.Everything modems will accept an invalid password entry, but will lock out users from the security commands. For example, if the password is Green, but you enter GREEN, an OK is displayed.

  • Page 88: What The Guest User Needs To Do

    If the host has prompting enabled and the host operator enables Dialback for your account, skip to Step 3. 2 For guest users with Courier V.Everything modems (or I-Modems) only: a Create a security account using the password the host’s administrator...

  • Page 89: Configuring Dial Security Remote

    3 If Dialback is enabled at the host Courier V.Everything modem’s site, set your modem to answer the host Courier V.Everything modem when it dials back. For your modem to be set To answer the Dialback call 4 Call the host.
  • Page 90 11-10 11: D HAPTER IAL SECURITY WARNING: If you do not use the ATZ command to end a remote-access session, Dial Security will remain disabled at the host, and anyone dialing in to the host for remote access will have access to the ATI10 screen and all Dial Security accounts.

  • Page 91: Flow Control

    This chapter contains information about Overview The Courier V.Everything modem has two buffers, one for data transmitted from your computer, and one for data received from the phone line. Flow control provides a system for stopping and starting transmissio depending on how full the buffers are. Flow control’s purpose is to prevent overfilling the buffers, which may cause data to be lost.

  • Page 92: Hardware Flow Contro

    12: F HAPTER LOW CONTROL Hardware and There are two kinds of flow control: hardware and software. Courier Software Flow V.Everything modems support both, but your computer and Control communications software must also support the kind of flow control you choose.

  • Page 93: Received Data Flow Contro L12-3

    RTS signal. Disable software (XON/XOFF) flow control. Recommended for non-ARQ (Normal mode) calls (see AT&I5). While the Courier V.Everything modem is online, the only characters it recognises are +++, the escape code. Enable software (XON/XOFF) flow control. Use in ARQ mode only.
  • Page 94 Transmit Data (AT&H) settings. Example: Sending data stream instead of sending them to the remote computer. This will force the Courier V.Everything modem to act of the XON/XOFF commands. will remove XON/XOFF commands from the AT&I2 Command AT&I3...

  • Page 95: Transmit-Data Flow Contro L12-5

    Transmit-Data Flow This type of flow control is for data transmitted to the Courier Control V.Everything modem by its attached computer. For your modem to Disable transmit data flow control Enable Hardware flow control. Requires that your computer and software support Clear to Send (CTS) at the EIA-232 interface.
  • Page 96 12-6 12: F HAPTER LOW CONTROL...

  • Page 97: Handshaking

    Another name for the negotiation process is "handshaking. Courier V.Everything modems default to V.90 modulation and try for the highest possible speed when they attempt to connect with another modem: 56 Kbps. If the remote device is not V.34-capable, a connection is made using the highest compatible modulation scheme (x2, V.34, V.FC,...

  • Page 98: Controlling The V.8 Call Indicate

    The V.8 protocol speeds call negotiation and specifies a call indicate tone. Providing the call indicate tone is optional. For compatibility, we ship the Courier V.Everything modem with the call indicate tone disabled. For your modem to Enable the call indicate tone...

  • Page 99: Capabilitie

    When the Courier answers a call, it sends out a series of answer tone signals until both devices negotiate the best connection rate.

  • Page 100: Hst

    V.Everything modem listens to the device's answer tones to identify what standard rate the remote analogue device is operating at, and adjusts t that rate. When a Courier V.Everything modem answers a call, it sends out a series of answer tone signals until both devices negotiate the best connection rate.

  • Page 101: Error-Control Command S13-5

    High-speed data calls are vulnerable to errors unless the data is protecte by error control. If your Courier V.Everything modem connects with a remote device at a high speed, but without error control, and if you are not using an error control protocol for your call, you may lose data.
  • Page 102 The operations defined in an error-control protocol include: The Courier V.Everything modem is set at the factory to try for a error-control connection and, if that isn't possible, to proceed with the call in Normal mode. This means that &M4 is set.
  • Page 103 V.42 Error Control The Courier V.Everything modem first tries for a V.42 connection, then a MNP connection. The following information is based on the Courier V.Everything modem's setting of &M4 This international standard includes a two-stage hand-shaking process: A Detection phase that is based on an exchange of predefine characters.

  • Page 104: Data Compression

    V.4 bis compression. This command also will disable MNP Level 5 (MNP5) compression. If a Courier V.Everything modem successfully establishes a V.42 error control connection with a remote device, it also negotiates for V.42bis data compression.

  • Page 105: Getting Maximum Throug Hput13-9

    The communications software allows fixing the serial port rate higher than the connection rate, by setting the software to 115200, 57600, or 38400 bps and setting the Courier to &B1. If the software automatically switches serial port rates to follow the connection rate, the Couri e r V.Everything modem's serial port rate...
  • Page 106 The protocols listed above further reduce throughput when an error control connection is established. The accuracy of the data is checke both by the file transfer protocol and the Courier V.Everything modem. To avoid redundancy, use the above protocols only for non-ARQ connections, and only at speeds of 2400 bps and below.
  • Page 107 ZMODEM should also be used for non-ARQ connections. Leave the Courier V.Everything modem at its &M4 and &K1 settings for both error control and data compression. YMODEM-G is another good choice, but never use it unless both the local and remote devices are using error control: if YMODEM-G detects an error, it aborts the transfer.
  • Page 108 13-12 13: H HAPTER ANDSHAKING ERROR CONTROL DATA COMPRESSION AND THROUGHPUT...

  • Page 109: Displaying Querying And Help Screens

    To view screen captures of the help screens in the following chapter, see Appendix B, Alphabetic Command Summary. Overview The Courier V.Everything modem can display information such as the current settings, product code, and call duration. Common Inquiry Commands Querying Here is a complete list of ATIn commands.
  • Page 110 (RAM) and display either OK (0) or ERROR (4), followed by OK when the test is completed. You may want to use this command if the Courier V.Everything modem appears to be malfunctioning. Display the Courier V.Everything modem ’s banner, or product title.

  • Page 111: Displaying Hel P14-3

    Support representatives use to help you solve problems. Displaying Hel The Courier V.Everything modem provides six Help, or command summary, screens: basic AT command set, ampersand (&) command set, percent (%) command set, dial command options (D), S-Registers (S), and the octothorpe (#) command set.
  • Page 112 14-4 14: D HAPTER ISPLAYING UERYING AND ELP SCREENS...

  • Page 113: Testing The Connection

    All loopback testing conforms to ITU-T Recommendation V.54. If you are using synchronous mode (&M1, &M6, &M7), testing is not available. ESTING THE CONNECTION Testing the Courier V.Everything modem using AT&T n Testing the Courier V.Everything modem using S-Register 16...

  • Page 114: Testing The Courier V.everything Modem Using At&Tn

    Example: Sendin a remote digital loopback test of your Courier V.Everything modem Disable error control (using the &M0 command, see Appendix B, Alphabetic Command Summary) before testing. If the modem is detecting errors and retransmitting the affected data, your results will be invalid.

  • Page 115: Using At&T

    ERROR message, you have issued an invalid command. 5 Send If the Courier V.Everything modem is in online mode, still connected to a remote modem, and you send AT&T1 or AT&T8, it drops the call, enters analogue loopback mode, sends a CONNECT result, and waits for loopback characters.

  • Page 116: Using At&T

    Since you don't type anything during this test, and the Courier V.Everything modem does not send anything to the screen, this option verifies only the Courier V.Everything modem. If there are no errors but your problem continues, it may be at the computer interface.

  • Page 117: Digital Loopback Testing

    1 Send the command testing. This command disables error control, fixes the connection rate at 2400 bps, and makes the Courier return to command mode when you type +++. 2 Establish a connection with the remote device 3 Send the Courier V.Everything modem the escape code,...

  • Page 118: Remote Digital Loopback Testing (At&T6, At&T7)

    Using Loopback Test acknowledge remote digital loopback test requests. This is the default so Requests (&T5) that your Courier V.Everything modem isn't subject to another user calling and tying up your Courier V.Everything modem without your permission. Transmitter To DTE...

  • Page 119: Testing Using Keyboard Data (At&T6)

    ATZ and ATZ! reset the Couri e r V.Everything modem i addition to ending the test. If you issue an invalid command, the Courier V.Everything modem sends an ERROR message. If you set Register S18, the Courier V.Everything modem automatically ends the test when the test timeout is reached.

  • Page 120: Testing Using A Built-In Test Pattern (At& T7)15-8

    You will not see the data on your screen. 5 Send the escape code, end the test by sending ATZ and ATZ! reset the Courier V.Everything modem in addition to ending the test. If you issue an invalid command, the Courier V.Everything modem sends an ERROR message.
  • Page 121 Testing the Courier V.Everything Modem using AT&T n 15-9 Data errors indicate a problem with the remote device or with the phone link. 6 Send , unless you used a reset command (ATZ or ATZ!). AT&M4...
  • Page 122 15-10 15: T HAPTER ESTING THE CONNECTION...

  • Page 123: Auto-Dialing 1

    This chapter will apply when you want the modem to work with devices, that communicate using synchronous protocols (i.e., mainframe computers). The Courier V.Everything modem must be connected to a synchronous serial port. There are two ways to operate your modem in analogue synchronous...

  • Page 124: Dedicated /Leased Line And Synchronous Applications

    Communications The devices at both ends of the link must use the same synchronous protocol. Softwar Ask your network administrator about the software support (for example a specific communications package) that you need to log into the network. Synchronous During synchronous operations, transmit and receive clocks at both ends of the phone link control the precise timing of the data flow.

  • Page 125: Configuring The Courier V.everything Modem For Leased Line Operation

    Configuring the You can use the Courier V.Everything modem in either smart or dumb Courier mode (determined by the position of DIP switch 8). V.Everything If you are using your modem on a leased or dedicated line, it is set to Modem for Leased &L1, and the remote modem has a comparable setting, the modems...

  • Page 126: Dial Using V.2 Bis Softwar E16-4

    HAPTER EDICATED EASED 3 Set DIP switch 10 OFF. This tells the Courier V.Everything modem to load NVRAM settings at power-on It does not matter whether the Courier V.Everything modem is in Dumb or Smart mode (DIP switch 8). 4 Decide which modem is to be the calling modem and which the answering modem.
  • Page 127 Courier V.Everything modem is online. If &Nn is set for 2-10, the Courier V.Everything modem ignores the %N rate and uses the &Nn rate as the online connection rate. To set the connection rate to...
  • Page 128 19200 bps. We recommend that you fix the rate between the computer or terminal and Courier V.Everything modem (%Nn) and that you set the connectio rate (&Nn) to match. This avoids dramatic changes in the rate produce when the connection rate adjusts to the offline clock speed.

  • Page 129: Dialing Using

    (hang-up) command or (the escape code) The only way for the modem to disconnect is to drop its Data Terminal Ready (DTR) signal. Either power off the Courier V.Everything modem or use your communications software (check the software user’s manual for instructions).
  • Page 130 The Courier V.Everything modem always generates the Transmit clock-timing signals when in synchronous mode. Data Terminal Ready (DTR) override must be OFF when using modem in online synchronous mode.

  • Page 131: Dialin G16

    For your modem to Disable automatic answering. Enable automatic answering. Due to the nature of synchronous dialup, the Courier V.Everythin modem auto answers only on the third or fourth ring. 5 Send to have your modem enter synchronous mode, followed by AT&M1...

  • Page 132: Hanging Up16-10

    Then you can set the Courier V.Everything modem to dial the remote device at power-on, when it receives the DTR signal from your computer, or when you press the Voice/Data switch.
  • Page 133 DTE over the serial interface. Typical use: systems that require synchronisation of data flowing in both directions. 4 Set the connection rate to be used (between the Courier V.Everythin modem and the remote communications device) when the Courier V.Everything modem is on line.
  • Page 134 9 Make sure that DIP switch 10 is OFF, to load settings from NVRAM. INE AND SYNCHRONOUS APPLICATIONS If the Courier V.Everything modem is set to a fixed rate, and the remote device is not set to the same rate, the modem hangs up.

  • Page 135: Roubleshooting

    Check that DIP switch 8 is ON, for "act on AT commands." If DIP switch 8 is OFF, power off the Courier V.Everything modem, set the switch ON, and power on the Courier V.Everything modem again. Then try typing A Enter again.
  • Page 136 Check your serial cable to make sure it is not a NULL modem cable. You may need to change the DTR setting at the Courier V.Everything modem. If so, see the chapter about Controlling EIA-232 Signaling. Make sure that the phone line from your wall jack connects to JACK port of the Courier V.Everything modem.

  • Page 137: Double Characters Are Appearing On Your Monitor17-3

    After you dial, the Courier V.Everything modem reports NO CARRIER and then hangs up Hear ringing but the Courier V.Everything modem won't answer The Courier V.Everything modem acts as though a data link has been established, but no call was received Carrier Detect (CD) may be overridden (with &C0), but your system may...

  • Page 138: Problems That Occur After Connect Ing17-4

    Occur After Connecting Your screen displays random or "garbage" characters Make sure that the Courier V.Everything modem is set to the same bit rate, word length, parity, and number of Stop bits as the device to which you are connecting.

  • Page 139: Mainframe Computer Keeps Dropping Your Conne Ction17-5

    Resident programs) or disk-caching programs, they may be interfering. Try disabling them before you run your communications software Make sure the Courier V.Everything modem is in the correct mode, fax or data, depending on whether the connection is to be made with a facsimile device or a data device.

  • Page 140: Errors During Software Downl Oad17-7

    Service Representative you talk with will give you a User Service Order (USO) number. Products without an USO number will not be accepted. 5 If you do return the Courier V.Everything modem to us, please follow these procedures: If your modem is attempting to answer a V.32 call, you may need t lengthen the extra V.32 answer tones.
  • Page 141 Mount Prospect, IL 6005 3Com will not accept packages sent COD, so be sure to send the modem postage paid 3Com will repair or replace your Courier V.Everything modem and return it to you via United Parcel Service. Outside the United States: Follow the instructions provided by the 3Com techncial support representative.
  • Page 142 17-8 17: T HAPTER ROUBLESHOOTING...

  • Page 143: How Bits Are Mapped To Decimal Value

    Understanding A bit-mapped S-Register uses one number to describe a collection of Bit-Mapped settings. Bit-mapping allows us to pack a lot of information in a small S-Registers space. Bit-mapped registers are in the form of Sr.b=n, where r is the bit-mapped register;.b is the bit;...

  • Page 144: Converting Bits To Decimal Val Uesa-2

    A: S-R PPENDIX EGISTERS Converting Bits to Starting with a string of eight bits, assign each "1" bit a value based o Decimal Values its position. Add the values to come up with the final decimal value. Here’s an example of how bits are converted to decimal values: 01001111 Converting Decimal Convert decimal values to bits by finding the largest decimal equivalent...

  • Page 145: Using Decimal Value

    Using Bits Turning individual bits on and off is the more direct way to set bit-mapped S-Registers. To do this, specify the S-Register that you want to set and then indicate which bits you want to turn on (1) or off (0). Example: Using Decimal An alternative way to set bit-mapped S-Registers is by adding the decimal...
  • Page 146 A: S-R PPENDIX EGISTERS S-Registers These default settings are for the United States and Canada. If you are in another country, settings may be slightly different. * Bit-mapped registers have up to eight functions. Function Break length, 10 ms XON character XOFF character Pulsed DSR duration, 20 ms DTR recognition time, 10 ms...

  • Page 147: A Complete List Of S-Registers

    Courier V.Everything modem. Sets the duration, in tenths of a second, that the Courier V.Everything modem waits after loss of carrier before hanging up. This guard time allows the Courier V.Everything modem to distinguish between a line...
  • Page 148 Courier V.Everything modem only). At power-on/reset, autodial number stored in NVRAM at position 0. Disable HST (used for testing V.32terbo in Dual Standard Courier V.Everything modems). Disable MNP Level 3 (used for testing Level 2). Hardware reset (works like powering off and then on).
  • Page 149 Test timer for software-initiated loopback testing (&Tn); disabled when S18 is set to 0. Used to set the duration of testing, in seconds, before the Courier V.Everything modem automatically times out and terminates the test. Sets the duration, in minutes, for the Inactivity Timer. The timer activates when there is no data activity on the R232 interface, and at the timeout the Courier V.Everything mode...
  • Page 150 Default Function Sets the duration, in 20-millisecond units, between pulsed DSR signals when the Courier V.Everything modem is set to &S2 or &S3. The default is 3 seconds. Sets DTR recognition time in 10-millisecond units. Sets duration, in 10-millisecond units, of the delay between RTS and the CTS in synchronous mode.
  • Page 151 S28 to zero eliminates the extra tones resulting in a faster connect time if, for example, the Courier V.Everything modem is set to use V.21 modulation (300 bps) or V.23 modulation (1200 bps).
  • Page 152 Transmit buffer when DTR drops during an ARQ call. This is provided to allow time for a remote device to acknowledge receipt of all transmitted data. Default = 0: The Courier V.Everything modem immediately hangs up when DTR drops. If the Courier V.Everything mode...
  • Page 153 Register Default Function Enabling local-access password protection disables the &Zn=s command (which stores up to 10 phone numbers) because stored phone numbers occupy the same space in NVRAM as the dialback numbers for Dial Security accounts. Symbol rate bit-mapped register used primarily by 3Com Technical Support for debugging purposes.
  • Page 154 A-12 A: S-R PPENDIX EGISTERS Register Default Function Bit-mapped register. See the beginning of this appendix for information about setting bit-mapped registers. Bit-mapped register. ( See the beginning of this appendix for information about setting bit-mapped registers). Bit-mapped register. ( See the beginning of this appendix for information about setting bit-mapped registers).
  • Page 155 Register Default Function Bit-mapped Register. See the beginning of this appendix for information about setting bit-mapped registers. Value Result Enable recognition of Ring A Enable recognition of Ring B Enable recognition of Ring C Enable recognition of Ring D Enable recognition of Ring E A complete list of S-Registers A-13...
  • Page 156 A-14 A: S-R PPENDIX EGISTERS...

  • Page 157: Basic Command Set

    This appendix contains an alphabetic listing of the AT commands to which the modem will respond. Default settings are Basic Command Set LPHABETIC UMMARY Command Function Display help for the Basic command set. Escape code. Once your modem is online with another device, the only command it recognises is an escape code of three typed plus signs, which forces the modem back to Command mode.

  • Page 158: Alphabetic Command Summary

    B: A PPENDIX LPHABETIC OMMAND Command With the exception of the Dial options, modems ignore any commands issued after D in the same command string. Command UMMARY Function Set handshaking options. ITU-T V.25 answer sequence; required to answer all V.34-type and overseas calls. Bell answer tone.
  • Page 159 Dial the number stored in memory at position n, where n = 0-9. Store the number in memory using the &Z command. Display help for the dial commands. Command mode echo. Enables or disables the display of your typed commands. If double characters appear on the screen, both the modem's local echo and your software's local echo are on Command...
  • Page 160 B: A PPENDIX LPHABETIC OMMAND Command Sr=n Sr.b=n UMMARY Function Display connection report (contains symbol rates). Display caller ID information. Display connection report. Display connection report. Control the modem clock. ATI6 displays the time. If online, display current call duration. If offline, display last call’s duration.

  • Page 161: Ampersand (&) Command Set

    Appendix D, Result Code Meanings and Sets. Ignore Dial Tone Microsoft default Courier V.Everything modem default Software reset. If DIP Switch 1 is ON (factory setting), revert to the settings in NVRAM. If DIP switch 1 is OFF, reset to the &F0 configuration template (no flow control).
  • Page 162 DTR is always ON (ignored). &D1 If issued before connecting with another device, the Courier V.Everything modem can enter online Command mode during a call by dropping DTR. &D1 functions similarly to the escape code (+++). Return online with the On command, or hang up with the Hn command.
  • Page 163 Command Function No guard tone. Use this in the United States and &G0 Canada. &G1 This sets a 550 Hz guard tone, and is used in some European countries. &G2 This sets an 1800 Hz guard tone, and is used in the U.K.
  • Page 164 B: A PPENDIX LPHABETIC OMMAND Command &Ln &Mn &Nn &Nn&UN UMMARY Function Use auto-enable/disable. The modem enables &K1 compression if the serial port rate is fixed (&B1) and disables compression if the serial port rate follows the connection rate (&B0) because compression offers no throughput advantage when the serial port and connection rates are equal;...
  • Page 165 Command Function n = 1 -16 Fixed rate. The modem connects only if the remote device is operating at the same rate. You can use this feature to filter out calls at other than a specific rate for security or other reasons. The connection rate must always be lower than or equal to the serial port rate.
  • Page 166 B-10 B: A PPENDIX LPHABETIC OMMAND Command &Rn &Sn &Tn UMMARY Function n=29 n=30 n=31 n=32 n=33 n=34 n=35 n=36 n=37 n=38 n=39 Received data (RTS) hardware flow control. &R0 Delay Clear to Send (CTS) response after Request to Send (RTS). &R1 Ignore RTS.
  • Page 167 Write the current settings to NVRAM. &Xn External modems only: Designate the source of synchronous transmit clock timing signals. The Courier V.Everything modem sends transmit &X0 clock timing signals to the DTE over the serial interface. DTE rate follows the connection rate.

  • Page 168: Percent (%) Command Set

    B-12 B: A PPENDIX LPHABETIC OMMAND resumes, the modems build new tables, and the result is lower-than- normal throughput. Command &Zn=s This command functions differently when Dial Security is enabled Also, do not include modem settings in the &Zn string. If the call requires a special setting, insert it in the command string before the DS command &Zn=L...
  • Page 169 Command Function 38400 bps 57600 bps %B10 115200 bps Remote configuration control. Defer configuration changes until the call is ended. Changes take effect for ensuing connections. Cancel configuration changes and restore the original configuration. Using%C1 will not reverse any changes that you wrote to NVRAM (with &W) or forced (with%C2).

  • Page 170: Octothorpe (#) Command Set

    Access the security accounts. Does not disable security. Enable the recognition of tone frequencies of analogue dialing devices.%T is meant primarily for use with network applications, but may also be integrated into certain software programs. For example, %T could be used in a security program to identify incoming tone security codes.
  • Page 171 Command Funtion #CID=4 Enable caller ID but do not transmit the information to your computer- retain it in the modem’s memory. #CID? Display the current caller ID settings. #CID=? Display the caller ID actions that are available. Octothorpe (#) Command Set B-15...
  • Page 172 B-16 B: A PPENDIX LPHABETIC OMMAND UMMARY...

  • Page 173: Hardware Flow Contro

    Hardware Flow The table below lists the Hardware flow control template. To load this Control template send ONTROL to your modem. AT&F1 NVRAM Options Setting Handshake option Transmitter Command mode echo Online local echo Training tone volume Speaker control Result codes Verbal or numeric result codes Result code subset...
  • Page 174 AT... &W string. EMPLATE Setting &M4 &N0 &P0 &R2 &S0 &T5 &X0 &Y1 &Z0-9=0 #CID=0 19.2 Description Normal/error control Variable U.S./Canada Enabled Always on Deny RDL Courier Clear buffer, send immediately Blank 9600 bps Caller ID disabled None...

  • Page 175: Software Flow Control

    Software Flow The table below lists the Software flow control template. To load this control template send NVRAM Options Handshake option Transmitter Command mode echo Online local echo Training tone volume Speaker control Result codes Verbal or numeric result codes Result code subset Protocol response codes...

  • Page 176: No Flow Contro

    EMPLATE Setting &X0 &Y1 &Z0-9=0 #CID=0 19.2 to the modem. AT&F0 Setting &A3 &B1 Description Courier Clear buffer, send immediately Blank 9600 bps Caller ID disabled None Description ITU-T answer sequence Enabled Enabled Disabled Medium ON during dial through connect...
  • Page 177 NVRAM Options Setting Carrier Detect &C1 Guard tone &G0 Transmit data &H0 hardware flow control Record data software &I0 flow control Analogue data &K1 compression Normal or leased lines &L0 Error control/sync &M4 Link rate select &N0 Record data hardware &R1 flow control Data Set Ready...
  • Page 178 C: F PPENDIX ONTROL EMPLATE...

  • Page 179: Eanings And

    Incoming distinctive ring detected. 174/RING E Incoming distinctive ring detected. Wait for another Dial Courier V.Everything modem continues diaing as soon as it detects Tone (W) another dial tone. Requires X3 or higher. Wait for an answer (@) Courier V.Everything modem continues dialing when it detects 5 seconds of silence on the line.

  • Page 180: Result Codes Sets For Xn Values

    D: R PPENDIX ESULT Result Codes Sets for Xn Values Result Codes 0/OK 1/CONNECT 2/RING 3/NO CARRIER 4/ERROR 5/CONNECT 1200 6/NO DIAL TONE 7/BUSY 8/NO ANSWER 10/CONNECT 2400 11/RINGING 12/VOICE 13/CONNECT 9600 18/CONNECT 4800 20/CONNECT 7200 21/CONNECT 12000 25/CONNECT 14400 43/CONNECT 16800 85/CONNECT 19200 91/CONNECT 21600...

  • Page 181: New Connect Message

    New Connect Message The table below includes all new connect messages. Message 28000 28000/ARQ 28000/V90 28000/ARQ/V90 29333 29333/ARQ 29333/V90 29333/ARQ/V90 30666 30666/ARQ 30666/V90 30666/ARQ/V90 32000 32000/ARQ 32000/V90 32000/ARQ/V90 34666 34666/ARQ 34666/V90 34666/ARQ/V90 36000 36000/ARQ 36000/V90 36000/ARQ/V90 38666 38666/ARQ 38666/V90 53333/V90 53333/ARQ/V90 New Connect Messages Message...
  • Page 182 D: R PPENDIX ESULT Message 54666/V90 54666/ARQ/V90 56000/V90 56000/ARQ/V90 57333/V90 57333/ARQ/V90 58666 58666/ARQ 58666/V90 58666/ARQ/V90 60000 EANINGS AND Message 60000/ARQ/V90 61333 61333/ARQ 61333/V90 61333/ARQ/V90 62666 62666/ARQ 62666/V90 62666/ARQ/V90 64000/V90 64000/ARQ/V90...

  • Page 183: Bis Reference

    V.25 bis communications software. You are not expected to send them to the modem the way you do with A commands. Commands PRNn EFERENCE Connect incoming call Instructs the Courier V.Everything mode Call request using Instructs the Courier V.Everything number provided mode this command. Example:...

  • Page 184: Dial Options

    E: V.25 PPENDIX EFERENCE Dial Options & > < Result Codes These are the normal (X0) result codes. For a complete list of result codes see Appendix D, Result Code Meanings and Sets. CFRT Digits Flash Wait for dial tone (Greater Than) separator Pause...
  • Page 185 CFNT INVCU INVMS INVPS INVPV Commands and Result Codes NO Supported Call aborted Local Courier V.Everything modem busy Remote device busy Forbidden call Number not stored Answer tone not detected Command unknown Message syntax error Parameter syntax error Parameter value error...
  • Page 186 E: V.25 PPENDIX EFERENCE...
  • Page 187 ASCII C HART Char Char & ë Char "66 Char...
  • Page 188 F: ASCII C PPENDIX HART Char Char < > Char à Char...
  • Page 189 Fax Service Class 1 Commands FAX Service Class In addition to the standard Class 2.0 fax commands, 3Com implements 2.0 Command the following optional Class 2.0 fax commands: NFORMATION FOR ROGRAMMERS +FCLASS? +FCLASS=n (0,1,2.0) +FCLASS=? +FTS=n (0,255) +FRS=n (0,255) +FTM=n (3,24,48,72,73,74,96,121,122,145,146) +FRM=n (3,24,48,72,73,74,96,121,122,145,146)
  • Page 190 G: F PPENDIX NFORMATION FOR Fax Mode Flow Many facsimile software products use software flow control when the Control Setting modem is in Fax mode. Throughout our documentation, we recommend that you use hardware flow control for Data mode (factory setting). However, to allow compatibility with software products that use software flow control by default, 3Com fax modems automatically change t software flow control when entering Fax mode...

  • Page 191: V.34

    LOSSARY 16550 UART The fastest type of UART that is currently available. Adaptive Speed Courier V.Everything V.32 bis and V.3 terbo modems detect improved Leveling (ASL) line conditions and shift upward again to the next higher speed. The modems at both ends of the connection adapt independently, eac detecting and adjusting to line conditions.
  • Page 192 LOSSARY dynamically reverse the channels during a call if the volume of data transfer changes. asynchronous Data transmission in which the length of time between transmitte transmission characters may vary. Because the time lapses between transmitted characters are not uniform, the receiving modem must be signaled as to when the data bits of a character begin and when they end.
  • Page 193 (CO) The facility to which devices, such as telephones, fax machines, and modems within a specific geographic area of a public telephone network are connected. central office switch A device, located at the telephone company's central office, to which...
  • Page 194 LOSSARY For example, at 2400 bps, 8-bit characters with start and stop bits (for a total of ten bits per character) will be transmitted at a rate of approximately 240 characters per second (cps). Some protocols, such as USR HST and MNP, employ advanced techniques such as longer transmission frames and data compression to increase cps.
  • Page 195 In this manual, the term applies to modems that establish and control equipment (DCE) the data link via the telephone network data mode The mode in which the fax modem is capable of sending and receiving data files. A standard modem without fax capabilities is always in Data mode.
  • Page 196 LOSSARY EIA-23 A technical specification published by the Electronic Industries Association that establishes mechanical and electrical interface requirements between computers, terminals, modems, an communication lines. EIA-232 was formerly known as RS-232. equalisation A compensation circuit designed into modems to counteract certain distortions introduced by the telephone channel.
  • Page 197 handshaking A sequence that two modems undertake while connecting to agree o the parameters of the conversation that will ensue. During handshaking, the modems negotiate the speed of the connection, whether error control and data compression will be used and in what form, and so forth.
  • Page 198 A device that transmits/receives computer data through a communications channel such as radio or telephone lines. The Courier V.Everything modem is a telephone channel modem that modulates, or transforms, digital signals from a computer into the analogue form that can be carried successfully on a phone line.
  • Page 199 Nonvolatile Random User-programmable random access memory whose data is retained Access Memory when modem power is turned off. Used in Courier V.Everything (NVRAM) modems to store a user-defined default configuration loaded into random access memory (RAM) at power on NVRAM See Non-volatile Random Access Memory.

  • Page 200: Result Code

    RAM as an operational configuration if DIP switch S10 is ON at power on. remote access A feature that allows a remotely-located user to view the Courier V.Everything modem's configuration screens and change the Courier V.Everything modem's configuration. Password protection is available.
  • Page 201 Differs from a microcomputer in that it has no internal processing capabilities. Used to enter data into or retrieve processed data from a system or network. terminal mode An operational mode required for microcomputers to transmit data. In Terminal mode the computer acts as if it were a standard terminal such as a teletypewriter, rather than a data processor.
  • Page 202 LOSSARY products control Terminal mode as well as enable more complex operations, including file transmission and saving received files. throughput The amount of actual user data transmitted per second without the overhead of protocol information such as Start and Stop bits or frame headers and trailers.
  • Page 203 3Com modems can be set with the B0 command so that they use the V.25 2100 Hz tone when answering overseas calls V.25 bis An ITU-T standard for synchronous communications between th mainframe or host and the modem using the HDLC or character-oriented protocol.
  • Page 204 Standard ASCII control characters used to tell a device to stop/resume transmitting data. In most systems typing <Ctrl>-S sends the XOFF character. Some devices, including the Courier V.Everything modem, understand <Ctrl>-Q as XON; others interpret the pressing of any key after <Ctrl>-S as XON.

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