Page 1: Command Reference
3Com OfficeConnect 56K Business Modem ® Command Reference http://www.3com.com/ Published January 1999...
Page 2 3Com Corporation reserves the right to revise this documentation and to make changes in content from time 60008 to time without obligation on the part of 3Com Corporation to provide notification of such revision or change. 3Com Corporation provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose.
Page 3: Table Of Contents
ONTENTS BOUT UIDE Introduction ... 1 Finding Specific Information in This Guide ... 2 Conventions ... 2 Related Documentation ... 3 Year 2000 Compliance ... 3 ONNECTING TO Windows 95/98 ... 1-1 What You Need ... 1-1 Configuring Your modem with Plug and Play ... 1-1 Files Needed By Your modem ...
Page 4 Setting up your ISP information ...1-16 Other Operating Systems ...1-17 If You Are Using Windows 3.x ...1-17 If You Are Using MS-DOS ...1-17 If You Are Using UNIX, Linux, or AIX ...1-17 AT C SING THE OMMAND Overview ...2-1 General rules for using AT commands ...2-1 Basic AT commands ...2-2 Using S-Registers ...2-2 Displaying S-Register settings ...2-3...
Page 5 Call Detection ... 4-6 Caller ID Functions ... 4-7 Service Types ... 4-7 Applications of Caller ID Technology ... 4-7 How the Business Modem Handles Caller ID ... 4-8 Presentation Formats ... 4-9 Commands ... 4-9 References ... 4-10 Distinctive Ring Support ... 4-10 Commands ...
Page 6 Controlling Link Speeds with &N and &U ...8-4 Controlling Link Speeds ...8-4 Limiting the Highest Possible Connect Speed ...8-4 Limiting the Lowest Possible Connect Speed ...8-5 Limiting a Range of Possible Connect Speeds ...8-5 &N and &U Command Values ...8-6 Setting DTE Rate to 230 Kbps ...8-7 CCESSING AND ONFIGURING THE...
Page 7 Software Flow Control ... 11-2 Received Data Flow Control ... 11-3 Transmit-Data Flow Control ... 11-5 ANDSHAKING RROR HROUGHPUT Handshaking ... 12-1 Selective Reject ... 12-1 V.34 ... 12-3 V.90 Capabilities ... 12-3 Other Protocols ... 12-3 x2 ... 12-3 Fast Class (V.FC) Handshaking ...
Page 8 Digital Loopback Testing (AT&T3) ...14-5 Remote Digital Loopback Testing (AT&T6, AT&T7) ...14-6 Granting a Digital Loopback Test Request (AT&T4) ...14-6 Canceling All Digital Loopback Test Requests (&T5) ...14-6 Testing Using Keyboard Data (AT&T6) ...14-7 Testing Using a Built-in Test Pattern (AT&T7) ...14-8 Testing the Business Modem using S-Resister 16 ...14-9 Analog Loopback (AL) S16=1D ...14-9 Testing Using Keyboard Data (ATS16=8) ...14-10...
Page 9 Getting New Operating Software ... 16-2 Sending New Software to your modem ... 16-2 If Your Modem Doesn’t Respond ... 16-4 EGISTERS Understanding Bit-Mapped S-Registers ...A-1 How bits are mapped to decimal values ...A-1 Converting Bits to Decimal Values ...A-2 Converting Decimal Values to Bits ...A-2 Setting Bit-Mapped S-Registers ...A-2 Using Bits ...A-3...
Page 10 FCC Notice ... G-2 Notes ... G-2 IEWING EGISTERS S-Registers ... I-1 ARRANTY 3Com Corporation Limited Warranty ...J-1 Notices ...J-4 FCC Certification Statement ...J-4 FCC Registration ...J-4 FCC Notice ...J-4 FCC Notice: Radio and Television Interference ...J-5 IC (Industry Canada) ...J-6 UL Listed Accessory ...J-6...
Page 11: About This Guide
Introduction This guide is a command reference for the 3Com OfficeConnect 56K Business 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 12: Conventions
BOUT UIDE Conventions Table 1 and Table 2 list conventions that are used throughout this guide. Table 1 Notice Icons Icon Table 2 Text Conventions Convention Commands Screen displays This typeface represents information as it appears on the The words “enter” and “type”...
Page 13: Related Documentation
The 3Com OfficeConnect 56K Business Modem Installation Guide should Documentation be used for the installation of the Business Modem. Year 2000 For information on Year 2000 compliance and 3Com products, visit the Compliance 3Com Year 2000 web page: http://www.3com.com/products/yr2000.html Related Documentation...
Page 14 BOUT UIDE...
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 recognize your modem.
Page 16: Files Needed By Your Modem
Select the your modem from the list and click OK. Your modem is now ready to use! Files Needed By Your For your modem to work most efficiently, 3Com recommends that you modem use the latest version of the modem software and information (INF) file from the 3Com U.S.
Page 17 Step One: Determine if Dial-Up Networking is Installed 1 Click Start | Settings | Control Panel. 2 On the Control Panel, double-click on Network. The Network widow will appear. If Dial-Up Adapter Do this Is listed Go to the section "Installing TCP/IP Support" to install Dial-Up Networking.
Page 18 1: C HAPTER ONNECTING TO 8 Insert your Windows 95/98 Setup diskette or CD-ROM when you are prompted, and Windows 95/98 installs Dial-Up Networking. Step Two: Installing Dial-Up TCP/IP Support 1 Click Start | Settings | Control Panel. 2 On the Control Panel, double-click on the Network to display the Network window: 3 Determine if the TCP/IP Dial-Up Adapter is installed: IF TCP/IP ->...
Page 19 Windows 95/98 9 On the My Connection window, click Server Type, and deselect the following: Log on to Network NetBEUI IPX/SPX Compatible...
Page 20 1: C HAPTER ONNECTING TO 10 Click OK, and OK. If your ISP Gives you a specific IP or Domain Name server addresses Does not give you a specific IP or Domain Name server addresses Step Four: Customizing the TCP/IP Settings Depending on the ISP you use, you may need to customize the TCP/IP settings.
Page 21 5 Specify an IP address, if needed: If your ISP Do this Gives you a specific IP Click Specify an IP address and enter the IP address address provided by your ISP Does not give you a Click Server assigned IP address specific IP address 6 After you specify an IP Address, specify server assigned name server addresses, if needed:...
Page 22: Windows Nt 4.0 And Later
1: C HAPTER ONNECTING TO 7 Double-click your New Connection icon to connect! Windows NT 4.0 TCP/IP is the main protocol used to transfer data via the Internet. To use and Later TCP/IP with Windows NT, you must connect to your ISP using a PPP or SLIP connection.
Page 23: What You Need
What you need Before you begin, obtain the following information: Does your ISP have a SLIP or PPP account? Your ISP’s telephone number Does your ISP supply a static or dynamic IP address? Your ISP's primary and secondary DNS servers INF file for Windows NT Configuring Your Since Windows NT is not Plug and Play compliant, it is necessary to install...
Page 24: Determining If Tcp/Ip Is Installed
1-10 1: C HAPTER ONNECTING TO 8 Click Network. 9 Select the protocols required to dial in and out with your Business Modem. 10 Set Encryption Settings to Allow any authentication including clear text. 11 Click Continue to complete RAS setup. Determining if TCP/IP TCP/IP must be installed before you can access the Internet.
Page 25: Configuring A Slip Connection
7 Select Enable software compression. 8 Specify an IP address by clicking TCP/IP settings. If your ISP Gives you a specific IP address Does not give you a specific IP address 9 After you specify an IP Address, specify server assigned name server addresses, if needed If your ISP Gives you specific name server...
Page 26: Troubleshooting Ras
1-12 1: C HAPTER ONNECTING TO Troubleshooting RAS RAS is significantly easier to troubleshoot then Win95 Dial-Up Networking, there are a finite number of problems that one runs into on a daily basis, and the majority of these are caused by misconfiguration. Most connection problems can be solved by following these steps: This is a general setup for your Business Modem using Windows NT.
Page 27: System Configuration
2 After the file is downloaded, it needs to uncompressed. When the file is uncompressed the USRARA.SEA Folder appears. 3 Inside the USRARA.SEA folder is a readmefirst.txt file and the 3Com High Speed script. 4 Move the script file to the following path C:\System\Extensions\ and create a folder named Modem Scripts.
Page 28: Configuring Open Transport Ppp
1-14 1: C HAPTER ONNECTING TO the script receives an OK back from the modem and/or the system responds with a proper speed. Configuring Open Selecting the correct modem Transport PPP 1 Go to Apple Menu | Control Panels | Modem. 2 In the Modems Window, choose the port that your modem is connected to in the Connect via drop down box.
Page 29: Selecting The Correct Tcp/Ip Settings
Macintosh 1-15 Selecting the correct TCP/IP settings 1 Go to Apple Menu | Control Panel | TCP/IP. 2 In the TCP/IP window, select PPP in the Connect via drop down box. 3 Set the Configure drop down box to Using PPP Server. 4 Type in your internet service providers Domain Name Server Address(DNS) numbers in the Name server addr box.
Page 30: Setting Up Your Isp Information
1-16 1: C HAPTER ONNECTING TO Setting up your ISP information 1 Go to Apple Menu | Control Panels | PPP. 2 In the PPP window, select Registered User. 3 Type in your Internet Service providers login name and your password in the name and password boxes.
Page 31: Other Operating Systems
Other Operating This sections explains how to configure your modem for: Systems If You Are Using Windows 3.x comes with a built-in communications software package, Windows 3.x Windows Terminal. You can use Windows Terminal to test your modem or you can install the communications software package that is included on the Connections CD-ROM.
Page 32 1-18 1: C HAPTER ONNECTING TO...
Page 33: Using The At Command Set
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 34: Basic At Commands
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 35: Displaying S-Register Settings
Displaying S-Register You can display S-Registers in a variety of ways. See the table below for settings more information. To display Contents of ONE S-Register S-Register settings in the NVRAM templates S-Register settings in RAM (the current configuration) Example: Sending When using the commands ATI4 and ATI5, S-Register settings appear as a table seven columns wide, each entry of the form, "Smm=nnn"...
Page 36: Getting A List Of S-Registers
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 37: Modes Of Operation
This chapter contains information about Command and Online Modes If you want to Control the modem using AT commands. Your modem set to revert to Command Mode when the Escape Code (+++) is used. Your modem to Disconnect when the Escape Code (+++) is used.
Page 38: Entering Online Command Mode
3: M HAPTER ODES OF PERATION Entering Online When the modem is in Online Mode, the only command it recognizes is Command Mode an escape code, or +++. Revert to Command Mode without losing connections by sending ATS14.0=0 5 Wait one second after sending the last item of data 6 Type 7 Wait for You can change the characters used to revert to Command Mode or the...
Page 39: Controlling Local Echo
Controlling Local There are two local echo settings, one for Command Mode and one for Echo Online Mode. Command-Mode You can configure your modem to display the commands you type on Local Echo screen by using the ATEn command If you want the commands you type to NOT appear on screen (Command Mode echo OFF) Appear on your screen (Command Mode echo ON) Although you cannot see the command when you set ATE0, the modem...
Page 40: Data And Fax Modes
3: M HAPTER ODES OF PERATION Data and Fax Once you are in Command Mode, you can initialize the modem in Data Modes or Fax mode. Fax operations require facsimile-compatible communications software that can send or receive Group III faxes. Follow the instructions in your fax software manual.
Page 41 If you are not sure whether your modem is in Data or Fax mode, use the command AT+FCLASS? If the modem returns a value of This indicates Data Mode Class 1 Fax Mode Class 2.0 Fax Mode. Whenever the modem is reset using the ATZ command or by turning the power off and then on, it will reset to Data Mode.
Page 42 3: M HAPTER ODES OF PERATION...
Page 43: Dialing , Answering , And Hanging
This chapter explains how to use basic AT commands for: Dialing You can use your modem to dial the specified phone number and execute dial options by using the following commands. Dial options For your modem to Dial the specified phone number and execute dial options (DO NOT use spaces or dashes).
Page 44 4: 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 45: Carrier Loss Redial
For your modem to Dial a number, wait 60 seconds for a connection, and then hang up. Wait two seconds, then redial. Make a maximum of 10 attempts. To stop the repeating, press any key during the pause between dial attempts. If you press any key while the modem is dialing, that dial attempt is canceled but the cycle will continue Dial the last-dialed number and repeat it just as the >...
Page 46: Answering Calls
4: D HAPTER IALING NSWERING Answering Calls Your modem can be configured to answer calls. By default, your Business Modem will not automatically answers calls. Force Answer Mode For your modem to Go through the answer sequence when it hasn't received an incoming call Manually answer a call Auto Answer...
Page 47: Handshaking Options
Hanging up If you want to end a connection with a remote device do the following: 1 Enter Online Command Mode by typing 2 Wait 1 second 3 Type Making You can use the ATBn, AT&Gn and ATPn commands for making analog International calls international calls above 1200 bps.
Page 48: Guard Tone
Call Detection Call Detection allows the modem to recognize whether an incoming call is analog data or fax. Call Detection is an optional Service Class 2.0 feature and is also implemented by 3Com for Fax Class 1 applications. ANGING Command AT&G0 (Default) AT&G1...
Page 49: Caller Id Functions
Caller ID Functions Caller ID Functions Caller ID is a service provided by local telephone companies. When you subscribe to caller ID, your phone company begins providing you real-time information about incoming calls. The caller ID signal includes the date and time of the call, the phone number of the calling device, and, optionally, the name of the calling party.
Page 50: How The Business Modem Handles Caller Id
3Com OfficeConnect 56K Business Modem CID Status… 80 1E 01 08 31 30 31 35 32 30 33 38 02 0A 37 30 38 35 35 35 30 30 30 31 07 0C 55 2E 53 2E 52 4F...
Page 51: Presentation Formats
Presentation Formats The Business 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. An Example of Formatted caller ID presentation: RING DATE = 1015...
Page 52: References
4-10 4: D HAPTER IALING NSWERING Caller ID Action 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 Business Modem’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 to...
Page 53: Commands
There are four ring patterns in common use: Ring Description 1.2 to 2.0 seconds on, 4.0 seconds off. 0.8 second on, 0.4 second off, 0.8 second on, 4.0 seconds off. 0.4 second on, 0.2 second off, 0.4 second on, 0.2 second off, 0.8 second on, 4.0 seconds off.
Page 54: Result Codes
If S70 is set to 0 (the default) the Business Modem detects ring types A and B, sending the result code RING for either ring type. This function is identical to that of other 3Com modems that do not support distinctive ring.
Page 55: Working With Memory
This chapter contains information about: You can upgrade the software held in Flash memory by performing a software download. See Chapter 3, Upgrading your Software, for more information about performing a software downloads. Overview Business Modems contain three types of memory that you can interact with: random access memory (RAM), nonvolatile random access memory (NVRAM), and Flash memory.
Page 56: Working With Ram And Nvram
5: W HAPTER ORKING WITH Example: Sending To see a complete listing of the permanent settings stored in Flash memory see Appendix C, Flow Control Templates. Working with RAM You can change any setting just for the current session. For example and NVRAM setting your Business Modem to remote devices at a rate of 14400 bps until the modem is reset.
Page 57: Displaying S-Register Value Information
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 Security, for more information. Displaying S-Register Value Information For your modem to...
Page 58: Saving Rom Templates To Nvram
5: W HAPTER ORKING WITH All of the settings in each template are given in Appendix C, Flow Control Templates. For more information about hardware and software flow control, See Chapter 12, Flow Control. Saving ROM To save one of the three ROM templates to NVRAM and have it serve as Templates to NVRAM the reset default, enter Default Settings...
Page 59: Controlling Result Code Displays
This chapter contains information about: Result Code Display The commands listed below control whether result codes are displayed, Commands and in what format they are displayed If you want the modem to Display result codes. NOT display result codes. NOT display result codes while in Answer mode. See Chapter 4, Modes of Operation, for a description of modes.
Page 60: Additional Result Code Subsets
6: C HAPTER ONTROLLING ESULT Additional Result Code Subsets ARQ (Automatic Repeat Request) is used in this manual to denote calls that use error control. For your modem to Display only connection rate. Display connection rate and ARQ result codes. Display connection rate, ARQ result code, and protocol information (V32, VFC, V34, or x2/v.90).
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 Business Ready 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
7: C EIA-232 S HAPTER ONTROLLING Data Set Ready Under normal conditions, the Business Modem sends a Data Set Ready (DSR) signal to your computer when it is ready to send and receive data. CAUTION: Do not change the default setting of &S0 unless you know that your installation requires a different setting.
Page 63: Carrier Detect
Carrier Detect Carrier means there is communication with the device on the other end of the connection. Under normal conditions, the Business Modem sends a Carrier Detect (CD) signal in response to establishing a connection with another modem. You can use the AT&Cn command to control how the Business Modem sends the CD signal.
Page 64 7: C EIA-232 S HAPTER ONTROLLING IGNALING...
Page 65: Controlling Data Rates
This chapter contains information about Overview You can set the Business Modem to use fixed or variable serial port rates and fixed or variable connection rates. Serial port rates pertain to data transferred between your computer and the Business Modem. Connection rates pertain to data transferred between the Business Modem and the device at the other end of a connection.
Page 66 8: C HAPTER ONTROLLING Your software may use terms such as locked serial port (fixed rate) or autobaud (variable rate). To allow your modem To change its serial port rate to match the connection rate. To always communicate with an attached device at the rate at which you have set the terminal or software, regardless of the connection rate.
Page 67: Connection Rates
Connection Rates You can set the Business Modem to a fixed or variable connection rate for data calls. Set a variable rate to have the Business Modem negotiate with the remote device for the highest possible connection rate. Set a fixed rate to connect only at a specified rate.
Page 68: Controlling Link Speeds With &N And &U
Range of possible connect speeds The default values for &N and &U are 0. If you change these values, you will limit the speeds at which you can connect. 3Com recommends that you do not alter these values. Limiting the Highest The &N command, when used in conjunction with the &U command,...
Page 69: Limiting The Lowest Possible Connect Speed
Limiting the Lowest The &U command allows you to limit the lowest possible connect speed. Possible Connect If a remote modem attempts to connect to your Business Modem at a Speed speed lower than &U, your Business Modem will not allow it to connect. To limit the Lowest possible connect speed...
Page 70: N And &U Command Values
8: C HAPTER ONTROLLING &N and &U Command Use the following table for a complete list of &N and &U link speeds and Values their associated indexes: Link Speed Highest 1200 2400 4800 7200 9600 12000 14400 16800 19200 21600 24000 26400 28800...
Page 71: Setting Dte Rate To 230 Kbps
Link Speed 46666 48000 49333 50666 52000 53333 54666 56000 57333 Setting DTE Rate to The DTE rate of your Business Modem has been increased to 230 kbps to 230 Kbps enhance throughput. This command is only supported on Business Modems attached to high speed serial cards.
Page 72 8: C HAPTER ONTROLLING ATES...
Page 73: Modem
This chapter contains information about: Overview You can set up the Business Modem so other devices can view or change its configuration remotely. You should be familiar with these terms before you continue: Local Remote Host Guest Setting Up Remote Access At the Host Business Modem...
Page 74 9: A HAPTER CCESSING AND 2 Enable remote access. Set Register S41 for a value of 1 or greater. S41 sets the number of log-in attempts available to the remote user. A setting of zero allows no log-in attempts disabling remote access. Example: Sending user.
Page 75: Other Remote-Access Commands
Other Remote-Access The table below is a list of remote-access configuration commands. Commands For your modem to Display a view-only password Display a view-and-change password Erase a view-only password Erase a view-and-change password Disable remote access entirely Example: Sending WARNING: If you erase the%P1 password without disabling remote access (using change its configuration.
Page 76: Viewing And Changing The Host's Configuration
ODEM EMOTELY 4 You should see a display similar to this: 3Com OfficeConnect 56K Business Modem 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 77: Remote Configuration Commands
Depending on your access privileges, you can use the regular set of Business Modem AT commands. If you have this access privilege View-only View and Configure CAUTION: Be careful not to send connection! Remote There are special commands that can be used only during a Configuration remote-access session.
Page 78 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%Cn command to control whether and when to apply changes to the configuration For your modem to...
Page 79: Quitting A Remote-Access Session
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 80 9: A HAPTER CCESSING AND ONFIGURING THE USINESS ODEM EMOTELY...
Page 81: Dial Security
This chapter contains information about: Overview Dial Security is designed to protect networks and data centers from unauthorized access. You should be familiar with these terms before you continue: Local Remote Host Guest You can configure up to 10 accounts: one administrative account for you and nine accounts for guest users.
Page 82: Setting Up Dial Security
10-2 10: D HAPTER ECURITY 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 40 available accounts (numbered 0-39) for your account. Use the AT%An command to set up user accounts.
Page 83: Dialback Options
Dialback options You can set the Business Modem to automatically dialback a certain number after a client modem dials in. Count your commas! There should always be four commas in the %A command.Do not insert spaces between commas or between fields and commas.
Page 84: Modifying Accounts
10-4 10: D HAPTER ECURITY will be locked out of the Business Modem’s dial security features. You will need to restore the factory defaults. This will erase ALL passwords and you will have to reconfigure all your accounts. 3 Set up guest-user accounts. Use the AT%An command to set up guest-user accounts in the same way you set up your administrative account.
Page 85: Autopass Prompting
The table below is a comparison between Autopass and Password prompting. When using Autopass Prompting Both the host and guest devices are made by 3Com and have Dial Security enabled. The connection between the Business Modems or modems is under V.42 error control (See Appendix B, Alphabetic Command Summary for information about using AT&M4 or AT&M5)
Page 86 10-6 10: D HAPTER ECURITY 6 Enable Dial Security. WARNING: Before you enable Dial Security, you must set up an administrative account and password. See Steps 1 & 2. For your modem to enable Autopass Dial Security Dial Security with Password Prompting (this also enables Autopass) Dialback Security, enable Password Prompting and enable Dialback in each...
Page 87: Maintaining Security Accounts
Maintaining Once the administrative password is set and Dial Security is enabled, the Security Accounts administrator is the only one who can access account information. You can use the AT%S= and AT%E= commands to change and modify account information. For your modem to Access accounts by disabling local security View account information, once access has been granted.
Page 88: What The Guest User Needs To Do
10-8 10: D HAPTER ECURITY What the Guest When guest users want to call in to the host (assuming you have enabled User Needs to Do Dial Security by entering 1 If the host has security enabled, get a password from the host’s administrator.
Page 89: Configuring Dial Security Remotely
3 If Dialback is enabled at the host Business Modem’s site, set your modem to answer the host Business Modem when it dials back. For your modem to be set To answer the Dialback call 4 Call the host. 5 After the call ends you can disable Auto Answer. For your modem to Disable Auto Answer Configuring Dial...
Page 90 10-10 10: D HAPTER ECURITY 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 Business 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 transmission 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 And Software Flow Control
11-2 11: F HAPTER ONTROL Hardware and There are two kinds of flow control: hardware and software. Business Software Flow Modems support both, but your computer and communications software Control must also support the kind of flow control you choose. Hardware Flow Business Modems implement hardware flow control by detecting that a Control...
Page 93: Received Data Flow Control
Received Data Flow Flow control settings are controlled by the AT&Rn and AT&In commands. Control The default settings are &R2&I0. Use the following table for more information about setting the flow control. For your modem to Pause before sending CTS signal after receiving the Request to Send (RTS).
Page 94 11-4 11: F HAPTER ONTROL For your modem to Enable Hewlett Packard-Terminal mode. Applies only to Business Modems attached to terminals in an HP system that uses the ENQ/ACK protocol. Use in ARQ mode only. Enable flow control when the connection is not under error control.
Page 95: Transmit-Data Flow Control
Transmit-Data Flow This type of flow control is for data transmitted to the Business Modem Control 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 11-6 11: F HAPTER ONTROL...
Page 97: Handshaking , Error Control , Data Compression , And Throughput
This chapter contains information about: Handshaking With each call, Business Modems go through a link negotiation process with the remote device. Another name for the negotiation process is "handshaking." Business Modems default to V.90 modulation and try for the highest possible speed when they attempt to connect with another modem: 56 Kbps.
Page 98 12-2 12: H HAPTER ANDSHAKING Selective Reject is an optional part of the ITU-T V.42 (LAPM) standard. For your modem to Enable Selective Reject Disable Selective Reject Attaining Speeds Above 28.8 Kbps V.34 connections at 21.6, 24, and 26.4 Kbps are common. To get connections of 28.8, 31.2, and 33.6 Kbps, line quality must be pristine end-to-end.
Page 99: V.34
V.90 Capabilities The Business Modem has V.90 capabilities. The Business Modem can dial into V.90 servers to establish speeds up to 56K downstream. For your modem to Enable V.90 Disable V.90...
Page 100: Hst
12-4 12: H HAPTER ANDSHAKING If the remote device has V.FC capability, the Business Modem uses a line probing technique to determine the highest speed possible under current line conditions, then completes the connection. If the remote analog device does not have V.FC capability, the Business Modem listens to the device's answer tones to identify what standard rate the remote analog device is operating at, and adjusts to that rate.
Page 101: Lower-Speed V. Protocols
Lower-speed V. Older, lower-speed "V." protocols do not employ line probing. Instead Protocols they use predefined answer tones to specify or identify speed capabilities. These protocols define the following maximum speeds: ASL (used in V.32terbo and V.32bis modes) is a technique that allows the Business Modem’s receivers and transmitters to act independently of each other.
Page 102 12-6 12: H HAPTER ANDSHAKING For your modem to Have no error control (Normal Mode) Due to the nature of phone line channels, this is never recommended for analog calls above 2400 bps Operate in Normal mode if an ARQ connection can’t be made (Normal/ARQ mode) Hangs up if it can’t make an ARQ connection (ARQ Asynchronous Mode)
Page 103: V.42 Error Control
The Microcom Networking Protocol (MNP) is supported by the ITU-T V.42 Recommendation. MNP is based on special protocol frames. If the remote device doesn't recognize an MNP Link Request, error control isn't possible. (In HST asymmetrical mode, 3Com devices use a proprietary scheme similar to MNP.) Error Control and...
Page 104: Data Compression
12-8 12: H HAPTER ANDSHAKING Data Compression Business Modems employ different data compression techniques during data connections. For the modem to Disable data compression Auto-enable/disable data compression. The Business Modem enables compression if the serial port rate is fixed (&B1) and disables compression if the serial port rate follows the connection rate (&B0).
Page 105: Getting Maximum Throughput
V.42bis compression is more efficient than MNP5 compression, in part because it dynamically deletes entries that are no longer used. In addition, it works better with files that are already compressed. These include.ZIP files and 8-bit binary files. MNP5 compression should NOT be used with binary files because it adds data to the files, which lessens throughput.
Page 106 12-10 12: H HAPTER ANDSHAKING Installations with specialized software may want to enable a fixed serial port rate for ARQ calls and a variable serial port rate for non-ARQ calls. See the &B2 command in Appendix B, Alphabetic Command Summary. The call is under data compression.
Page 107 Getting Maximum Throughput 12-11 Overhead is minimal with ZMODEM, resulting in throughput that is almost equal to that obtained with no file-transfer protocol. ZMODEM should also be used for non-ARQ connections. Leave the Business Modem at its &M4 and &K1 settings for both error control and data compression.
Page 108 12-12 12: H HAPTER ANDSHAKING RROR ONTROL OMPRESSION HROUGHPUT...
Page 109: Displaying Querying And Help Screens
This chapter contains information about: To view screen captures of the help screens in the following chapter, see Appendix B, Alphabetic Command Summary. Overview The Business Modem can display information such as the current settings, product code, and call duration. Common Inquiry Commands For your modem to display Current settings...
Page 110 Display the Dial Security Account Status. For security administrators only, unless local security is disabled (S53=0 or S53.2=0) Display a connection report that 3Com Technical Support representatives use to help you solve problems. Display caller ID information from the current call (if in progress) or the last call (if between calls).
Page 111: Displaying Help
Displaying Help The Business Modem provides six help, or command summary, screens: basic AT command set, ampersand (&) command set, percent (%) command set, percent (%) command set, dial command options (D), S-Registers (S), and the octothorpe (#) command set. For your modem to display A partial summary of the basic command set A partial summary of the ampersand command set...
Page 112 13-4 13: D HAPTER ISPLAYING UERYING AND CREENS...
Page 113: Testing The Connection
ESTING THE This chapter contains information about: Overview Your modem can perform digital and remote digital loopback tests. You can use these tests to check the operations of the transmitter and receiver, or to locate a problem with a remote device or a telephone line. Testing is done by sending the AT&Tn command or by setting Register S16.
Page 114: Testing The Business Modem Using At&Tn
14-2 14: T HAPTER ESTING THE ONNECTION Testing the Business To perform digital loopback and remote digital loopback testing use the Modem using AT&Tn command. You can type in your own data during testing or use AT&Tn the modem's internal test pattern and error detector. See the following sections for more detailed information about each AT&Tn command.
Page 115: Analog Loopback Testing
Analog Loopback Local loopback testing checks the operation of the Business Modem Testing transmitter and receiver. Using AT&T1 1 Send AT&M0&N3S14.0=0 This command disables error control, fixes the connection rate at 2400 bps, and makes the modem return to command mode when you type 2 Send AT&T1 status light flashes.
Page 116 14-4 14: T HAPTER ESTING THE ONNECTION If you use the S18 test timer, but in the process of testing you issue an ATZ command, S18 resets to zero and the timer is disabled. You cannot store a value for S18 in NVRAM; its power-on and reset default is always zero.
Page 117: Digital Loopback Testing (At&T3)
Digital Loopback This test can help you locate a problem with a remote device or with the Testing (AT&T3) telephone line. The figure below shows the data flow during Digital Loopback (DL) testing. 1 Send the command testing. This command disables error control, fixes the connection rate at 2400 bps, and makes the Business Modem return to command mode when you type +++.
Page 118: Remote Digital Loopback Testing (At&T6, At&T7)
14-6 14: T HAPTER ESTING THE ONNECTION Remote Digital The remote digital loopback test, verifies the condition of both devices Loopback Testing and of the phone line. Data flow is shown in the figure below. (AT&T6, AT&T7) Data Flow During Remote Digital Loopback. The request for and granting of remote digital loopback testing requires that both devices use ITU-T V.22 standard signaling.
Page 119: Testing Using Keyboard Data (At&T6)
Testing Using Keyboard Data (AT&T6) 1 Send AT&M0&N3S14.0=0 This command disables error control, fixes the connection rate at 2400 bps, and makes the Business Modem return to command mode when you type the escape code ( 2 Establish a connection with the remote device. 3 If you haven't already done so, arrange with the remote user to cooperate with the test.
Page 120: Testing Using A Built-In Test Pattern (At&T7)
3 If you haven't already done so, arrange with the remote user to cooperate with the test. If necessary, set the remote device to acknowledge the remote digital loopback request. For example, older 3Com modems need to be set to S16=8. 4 Send mode, and the MR status light flashes.
Page 121: Testing The Business Modem Using S-Resister 16
Testing the Business Register S16 is a bit-mapped register (See Appendix A, S-Registers, for Modem using instructions for setting bit-mapped registers). S-Resister 16 For your modem to use Remote digital loopback with built-in test pattern Remote digital loopback using keyboard data Earlier modems require bit 3 to be enabled to grant digital loopback testing to a remote device.
Page 122: Testing Using Keyboard Data (Ats16=8)
3 If you haven't already done so, arrange with the remote user to cooperate with the test. If necessary, set the remote device to acknowledge the remote digital loopback request. 3Com modems should be set to &T4. (Older 3Com modems should be set to S16=8.) 4 Send the Business Modem The Business Modem enters remote digital loopback mode and then goes back online (O command).
Page 123: Testing Using A Built-In Test Pattern (Ats16=4)
Testing Using a The test pattern is available at all speeds. At 300 bps, the Business Built-in Test Pattern Modem's serial port rate must be fixed (&B1) and the link rate fixed at (ATS16=4) 300 bps (&N1). At rates over 9600 bps, just set the Business Modem for a fixed serial port rate (&B1).
Page 124 14-12 14: T HAPTER ESTING THE ONNECTION...
Page 125: Troubleshooting
ROUBLESHOOTING This chapter explains how to troubleshoot the Business Modem. This chapter is divided into these sections: Problems That Occur Before Connecting No response to AT For Windows users, make sure that you set the correct COM port and IRQ in your communications software and, if applicable, in Windows' Control Panel - Ports.
Page 126: The Business Modem Won't Dial
15-2 15: T HAPTER ROUBLESHOOTING For your modem to enable message display Display verbal messages The Business Modem won't dial Make sure that verbal result codes (status messages) are enabled. Send these commands to the Business Modem: Review your communications software manual to see what Carrier Detect (CD) operations your software requires.
Page 127: Double Characters Are Appearing On Your Monitor
Double characters are appearing on your monitor This is a signal that both the Business Modem's local echo and your software's local echo are on. Type the command to turn off your online echo (ATF1) or turn your communications software's local echo off (refer to your software's documentation).
Page 128: Problems That Occur After Connecting
15-4 15: T HAPTER ROUBLESHOOTING Problems that Occur After Connecting Your screen displays random or "garbage" characters Make sure that the Business 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 129: Mainframe Computer Keeps Dropping Your Connection
Mainframe computer keeps dropping your connection You must turn off the Business Modem's result codes and character echo (ATQ1E0). The modem at the mainframe also needs to be set to ATQ1E0. Bad faxes or can't fax Both devices exchange carrier signals, but fail to establish a communications link Problems that Occur After Connecting Make sure the fax software is set to use Class 1 fax.
Page 130: Errors During Software Download
3Com Corporation. 3 If your dealer can't help you, refer to the Getting Started Guide provided in this package. This guide lists several important 3Com numbers. 4 If you must return your Business Modem to us, the Service Representative you talk with will give you a Service Repair Order (SRO) number.
Page 131 Dock 15 PCD 1800 West Central Mount Prospect, IL 60056 3Com will not accept packages sent COD, so be sure to send the modem postage paid. 3Com will repair your Business Modem and return it to you via United Parcel Service.
Page 132 15-8 15: T HAPTER ROUBLESHOOTING...
Page 133: Upgrading
This chapter contains information about: Overview 3Com periodically releases updates and enhancements to the modem’s operating software which are made publicly available from our Web site, BBS, and ftp site. Checking Your Issuing the Business Modem’s Software Version ati7 3Com OfficeConnect 56K Business Modem Configuration Profile...
Page 134: Getting New Operating Software
These dates will determine which version of the software your modem is using. The best way to find out the current shipping version of the modem’s software is to visit the 3Com U.S. Robotics Web site at http://www.usr.com/home/online. Getting New To get the newest version of the Business Modem’s operating software:...
Page 135 2 Enter . The modem should respond as follows: AT~X! at~x! SDL Xmodem file transfer - (Y)es (N)o (T)est > 3 Type to start an integrity test of the XMD file. Your screen t <ENTER> should appear as follows: SDL Xmodem file transfer - (Y)es (N)o (T)est >t * Test Mode - Flash ROM will not be modified* Begin Xmodem file transfer now.
Page 136: If Your Modem Doesn't Respond
16-4 16: U HAPTER PGRADING If Your Modem If your modem doesn’t respond after the flash process, its memory may Doesn’t Respond be corrupted. Follow these steps to force the new software to the modem. 1 Power your modem off. The power switch is in the rear right corner of the back panel.
Page 137: Understanding Bit-Mapped S-Registers
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 138: Converting Bits To Decimal Values
A: S-R PPENDIX EGISTERS Converting Bits to Starting with a string of eight bits, assign each "1" bit a value based on 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 139: Default S-Register Settings
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 140 A: S-R PPENDIX EGISTERS S-Registers * 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 RTS/CTS delay time, 10 ms Bit-mapped functions* V.32 handshake time, 100 ms V.21 handshake time, 100 ms Bit-mapped functions* Bit-mapped functions*...
Page 141: A Complete List Of S-Registers
A complete list of S-Registers Register A complete list of S-Registers Default Function Sets the number of rings on which to answer in Auto Answer mode. S0=0 disables Auto Answer. S0=1 enables Auto Answer and the Business Modem answers on the first ring.
Page 142 A: S-R PPENDIX EGISTERS Register Default Function Bit-mapped register. See the beginning of this appendix for information about setting bit-mapped registers. Value Bit-mapped register (See the beginning of this appendix for information about setting bit-mapped registers). Value Bit-mapped register. (See the beginning of this appendix for information about setting bit-mapped registers).
Page 143 Set Backspace key to delete. Some earlier 2400 bps MNP modems, not made by 3Com or Microcom, were not fully compatible with the MNP protocol. If you have difficulty making a...
Page 144 A: S-R PPENDIX EGISTERS Register Default Function 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 Business Modem hangs up. S19=0 disables the timer. Sets, in 10-millisecond units, the length of breaks sent from the Business Modem to the computer or terminal.
Page 145 Business Modem does LAPM, but not the Detection phase. Value Result Disable V.32bis. Used for troubleshooting; 3Com Technical Support may ask you to disable V.32bis for testing purposes. Disable the Business Modem's enhanced, proprietary V.32bis modulation. Used for troubleshooting.
Page 146 A-10 A: S-R PPENDIX EGISTERS Register Default Function Sets the duration, in seconds, before a forced hang-up and clearing of the 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.
Page 147 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. Trellis code bit-mapped register used primarily by 3Com Technical Support for debugging purposes.
Page 148 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. Value Bit-mapped register. (See the beginning of this appendix for information about setting bit-mapped registers). Value Bit-mapped Register. See the beginning of this appendix for information about setting bit-mapped registers.
Page 149: Alphabetic Command Summary
This appendix contains an alphabetic listing of the AT commands to which the modem will respond. Default settings are Basic Command Set Command > A> LPHABETIC OMMAND UMMARY Function Display help for the Basic command set. Escape code. Once your modem is online with another device, the only command it recognizes is an escape code of three typed plus signs, which forces the modem back to Command mode.
Page 150: Optional Parameters
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. Bell answer tone. This setting selects HST modulation, but use it only if the modem is not required to answer V.34-type calls.
Page 151 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.
Page 152 B: A PPENDIX LPHABETIC OMMAND Command Sr=n Sr.b=n See Appendix A, S-Registers for a listing of all the S-Registers. Command UMMARY Function Control the modem clock. ATI6 displays the time. If online, display current call duration. If offline, display last call’s duration. Display the actual time.
Page 153: Ampersand (&) Command Set
Command Ampersand (&) Command Set Command &$ &An &Bn The serial port rate MUST be equal to or higher than the &Nn rate. Command &Cn Ampersand (&) Command Set Function Ignore Dial Tone Microsoft default Business Modem default Software reset. Pressing the RESET button on the rear panel of the modem resets the modem to the &F0 configuration template (no flow control).
Page 154 B: A PPENDIX LPHABETIC OMMAND Command &Dn &Fn &Gn &Hn UMMARY Function Normal operations. The modem sends a CD signal &C1 when it connects with another modem and drops the CD when it disconnects. Control how the modem responds to Data Terminal Ready (DTR) signals.
Page 155 Command Function Use hardware flow control. Requires that your &H1 computer and software support Clear to Send (CTS) at the EIA-232 interface. &H2 Use software flow control. Requires that your software support XON/XOFF signaling. &H3 Use both hardware and software flow control. If you are unsure about what your equipment supports, select this option.
Page 156 B: A PPENDIX LPHABETIC OMMAND Command &Ln &Mn &Nn &Nn&UN UMMARY Function &K3 Selective data compression. The modem negotiates only for V.42bis compression, and disables MNP Level 5 (MNP5) compression. Use this setting to transfer compressed files. Line type. Normal. &L0 Enable ARQ (error control) protocol.
Page 157 Command Function n=13 n=14 n=15 n=16 n=17 n=18 n=19 n=20 n=21 n=22 n=23 n=24 n=25 n=26 n=27 n=28 n=29 n=30 n=31 n=32 n=33 n=34 n=35 n=36 n=37 n=38 n=39 &Rn Received data (RTS) hardware flow control. &R0 Delay Clear to Send (CTS) response after Request to Send (RTS).
Page 158 B-10 B: A PPENDIX LPHABETIC OMMAND Command &Sn &Tn &Wn &Yn UMMARY Function Enable hardware flow control of received data. &R2 The modem sends data to the computer only upon receipt of the RTS signal. Send the computer a Data Set Ready (DSR) signal via the EIA-232 interface.
Page 159: Percent (%) Command Set
Command If the call is under MNP5 data compression, destructive breaks cause both modems to reset their data compression tables. When transmission 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.
Page 160 B-12 B: A PPENDIX LPHABETIC OMMAND Command Using%C1 will not reverse any changes that you wrote to NVRAM (with &W) or forced (with%C2). We recommend against forcing configuration changes unless it is absolutely necessary. An unreliable connection, or loss of connection, may result.
Page 161: Octothorpe (#) Command Set
Command %Pn= %Pn=s %Pn? %S=n %V=PWn Octothorpe (#) Command Set Command #CID=n #CID? #CID=? Octothorpe (#) Command Set Function Remotely configure another device’s data format. No parity, 8 data bits. Mark parity, 7 data bits. Odd parity, 7 data bits. Even parity, 7 data bits.
Page 162 B-14 B: A PPENDIX LPHABETIC OMMAND UMMARY...
Page 163: Template
Hardware Flow The table below lists the Hardware flow control template. To load this Control template send NVRAM Options Handshake option Transmitter Command mode echo E1 Online local echo Training tone volume Speaker control Result codes Verbal or numeric result codes Result code subset Protocol response codes...
Page 164 C: F PPENDIX ONTROL NVRAM Options Error control Link rate select Pulse dialing type Record data hardware flow control Data Set Ready Remote Digital Loopback (RDL) Break handling Stored telephone number Caller ID Word length* Parity* DTE rate* (Kbps) * Detected by each modem from the AT prefix of the &W command that writes your defaults to NVRAM.
Page 165: 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 E1 Online local echo Training tone volume Speaker control Result codes Verbal or numeric result codes Result code subset Protocol response codes...
Page 166: No Flow Control
C: F PPENDIX ONTROL NVRAM Options Stored telephone number Caller ID Word length* Parity* DTE rate* (Kbps) * Detected by each modem from the AT prefix of the &W command that writes your defaults to NVRAM. Set your software to the desired word length, parity, and serial port rate defaults before sending the modem the AT...
Page 167 NVRAM Options Setting Record data software &I0 flow control Analog data &K1 compression Normal lines &L0 Error control &M4 Link rate select &N0 Record data hardware &R1 flow control Data Set Ready &S0 Remote Digital &T5 Loopback (RDL) Break handling &Y1 Stored telephone &Z0-9=0...
Page 168 C: F PPENDIX ONTROL EMPLATE...
Page 169: Eanings And
Result Code Meanings Result Code 0/OK 1/CONNECT 2/RING 3/NO CARRIER 4/ERROR 5/CONNECT 1200 6/NO DIAL TONE 7/BUSY 8/NO ANSWER 11/RINGING 12/VOICE 170/RING A 171/RING B 172/RING C 173/TING D Wait for another Dial Tone (W) Wait for an answer (@) Business Modem continues dialing when it detects 5 ESULT Meaning Command has been executed.
Page 170: 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 171: Information
ITU-T V.32 ITU-T V.22 bis Bell 212A NFORMATION Supports ITU 56K standard, server capabilities. V.90 analog clients can call into your Business Modem to get 56K connections Up to 56 Kbps downstream and V.34 speeds upstream 33.6/31.2/28.8/26.4/24/21.6/19.2/16.8/14.4/12 kbps; 9600/7200/4800 bps asynchronous Trellis Coded Modulation (TCM) 28.8/26.4/24/21.6/19.2/16.8/14.4 kbps asynchronous...
Page 172: Error Control, Data Compression, Testing, And Dialing
E: T PPENDIX ECHNICAL NFORMATION This modulation ITU-T V.23 Bell 103 Error Control, Data Compression, Testing, This and Dialing ITU-T V.42 ITU-T V.42 bis ITU-T V.54 Your Business Modem provides Group III -compatibility when controlled by Class 1 or Class 2.0 fax software. In addition, your Business Modem adheres to the following standards: This TIA/EIA-578...
Page 173: Additional Specifications
Additional Specifications This feature Supported serial port rates Adaptive Speed Leveling (ASL) Serial port connector Communications channel Data format Flow Control Buffers Command Buffer Test Options Failed Call Timeout Answer Tone Timeout Answer Tone Detector 2080-2120 Hz Loss of Carrier (Disconnect Timer) Equalization Receive Sensitivity...
Page 174: Wiring A Db-25 To Db-9 Cable
E: T PPENDIX ECHNICAL NFORMATION The EIA-232 Interface Your modem’s serial port is factory set to signal according to the EIA-232 standard. See Figure A-1, Signals at your Business Modem's Serial Port. Wiring a DB-25 to DB-9 connectors for PCs should be wired at the computer end of the DB-9 Cable cable as shown below.
Page 175: Flow Control Requirements
Flow Control If your computer and software support Clear to Send and you wish to use Requirements Transmit Data hardware flow control (&H1), Pin 5 (DB-25) or Pin 8 (DB-9) is required. If your computer and software support Request to Send and you wish to use Received Data hardware flow control (&R2), Pin 4 (DB-25) or Pin 7 (DB-9) is required.
Page 176: Serial Ports (Macintosh Modem
E: T PPENDIX ECHNICAL NFORMATION Serial Ports These are the signals generated or accepted by your modem’s serial port: (Macintosh modem)
Page 177: Ascii Chart
ASCII C HART Char Char "66 & ë Char Char...
Page 178 F: ASCII C PPENDIX HART Char Char < > Char Char à...
Page 179: Fax Service Class 2.0 Commands
+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) +FTH=n (3,24,48,72,73,74,96,121,122,145,146) +FRH=n (3,24,48,72,73,74,96,121,122,145,146) FAX Service Class In addition to the standard Class 2.0 fax commands, 3Com implements 2.0 Commands the following optional Class 2.0 fax commands: +FNS=0,1 +FCR=0,1 +FAA=0,1 +FCT=0-255 sec. +FHS=0-255 +FMS=0-3 +FBS?=500,100...
Page 180: Fax Mode Flow Control Setting
Data mode (factory setting). However, to allow compatibility with software products that use software flow control by default, 3Com fax modems automatically change to software flow control when entering Fax mode. FCC Notice...
Page 181: Viewing Leds
IEWING This appendix explains how to view the twelve LEDs on the front of your Business Modem. This LED Alert Power Status Means your Business Modem Has detected a firmware dowload error Flashing Firmware update in progress Normal operation Is switched on is switched off Is currently configured for fax operation is not currently configured for fax operation...
Page 182 H: V PPENDIX IEWING This LED Status Means your Business Modem RS232 mode: has detected DTR signal USB mode: has detected successful USB registration RS232 mode: has not detected DTR USB mode: has not detected successful USB registration Has detected a carrier from a remote device or carrier detect has been forced on Has not detected a carrier Has detected the Ready to Send (RTS) signal from your...
Page 183: S-Registers S-Registers
S-Registers S-Registers: Their Functions and Default Settings Register EGISTERS Default Function Sets the number of rings on which to answer in Auto Answer mode. S0=0 disables Auto Answer. S0=1 enables Auto Answer and the Business Modem answers on the first ring.
Page 184 I: S-R PPENDIX EGISTERS Register Default Function Sets the duration, in tenths of a second, that the Business Modem waits after loss of carrier before hanging up. This guard time allows the Business Modem to distinguish between a line hit, or other disturbance that momentarily breaks the connection, from a true disconnect (hanging up) by the remote device Sets the duration and spacing, in milliseconds, of dialed...
Page 185 Set Backspace key to delete. Some earlier 2400 bps MNP modems, not made by 3Com, U.S. Robotics, or Microcom, were not fully compatible with the MNP protocol. If you have difficulty making a successful 2400...
Page 186 I: S-R PPENDIX EGISTERS Register Default Function Bit-mapped register. (See Chapter 1, Using the AT Command Set, for instructions on setting bit-mapped registers.) For testing, see Chapter 14, Testing. Value Result Test pattern. Remote digital loopback. Test timer for software-initiated loopback testing (&Tn); disabled when S18 is set to 0.
Page 187 Disable V.42 Detection and LAPM. Disable Detection phase, if you know that the remote modem does LAPM, but not the Detection phase. Value Result Disable V.32bis. Used for troubleshooting; 3Com Technical Support may ask you to disable V.32bis for testing purposes.
Page 188 I: S-R PPENDIX EGISTERS Register Default Function Value Result Disable the Business Modem's enhanced, proprietary V.32bis modulation. Used for troubleshooting. Disable the faster retrains that occur during proprietary V.32terbo modulation. Used for troubleshooting. Enable V.23. Required for some British connections. Disable the remote-access busy message.
Page 189 Bit-mapped register. (See Chapter 1, Using the AT Command Set, for instructions about how to set bit-mapped registers.) Symbol rate bit-mapped register used primarily by 3Com Technical Support for debugging purposes. Trellis code bit-mapped register used primarily by 3Com Technical Support for debugging purposes.
Page 190 I: S-R PPENDIX EGISTERS Register Default Function Bit-mapped register primarily used by 3Com Technical Support for debugging purposes. Value Result Disable non-linear coding. Disable TX level deviation. Disable preemphasis. Disable precoding. Disable shaping. Disable V.34+. Disable V.34. Disable V.FC. Bit-mapped register primarily used by 3Com Technical Support for debugging purposes.
Page 191: J Warranty
56K Business Modem workmanship and materials, under normal use and service, for the lifetime of the product from the date of purchase from 3Com or its authorized reseller. 3Com's sole obligation under this express warranty shall be, at 3Com's option and expense, to repair the defective product or...
Page 192 PPENDIX ARRANTY data on and after January 1, 2000, and Customer notifies 3Com before the later of April 1, 2000, or ninety (90) days after purchase of the product from 3Com or its authorized reseller, 3Com shall, at its option...
Page 193 WITH THE SALE, INSTALLATION, MAINTENANCE OR USE OF ITS PRODUCTS. 3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THAT THE ALLEGED DEFECT OR MALFUNCTION IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY...
Page 194: Notices
International Sale of Goods. Important: If you send your unit, pack it securely and be sure your SRO number is visible on the outside of the package. Notices FCC Certification 3Com Statement 3800 Golf Rd. Rolling Meadows, IL 60008 FCC Registration...
Page 195: Fcc Notice: Radio And Television Interference
FCC Notice: Radio and Television Interference This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
Page 196: Ic (Industry Canada
J: W PPENDIX ARRANTY IC (Industry Canada) This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the interference-causing equipment standard entitled Digital Apparatus, ICES-003 of Industry Canada. ...
Page 197: Glossary
LOSSARY 16550 UART The fastest type of UART that is currently available. Business Modem V.32 bis and V.32 terbo modems detect improved line Adaptive Speed Leveling (ASL) conditions and shift upward again to the next higher speed. The modems at both ends of the connection adapt independently, each detecting and adjusting to line conditions.
Page 198 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 transmitted 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 199 copies of transmitted frames until they are positively acknowledged by the receiving modem. byte A group of binary digits stored and operated upon as a unit. A byte may have a coded value equal to a character in the ASCII code (letters, numbers), or have some other value meaningful to the computer.
Page 200: Data Communications
CRC code and responds with either a positive or negative acknowledgment. In the ARQ protocol implemented in 3Com high speed modems, the receiving modem accepts no more data until a defective block is received correctly.
Page 201 EIA-232 was formerly known as RS-232. equalization A compensation circuit designed into modems to counteract certain distortions introduced by the telephone channel. Two types are used: fixed (compromise) equalizers and those that adapt to channel conditions. 3Com high speed modems use adaptive equalization. LOSSARY...
Page 202 LOSSARY error control Various techniques which check the reliability of characters (parity) or blocks of data. V.42, MNP and HST error control protocols use error detection (CRC) and retransmission of errored frames (ARQ). expansion bus A series of slots inside a computer that allow for adding feature cards. facsimile (fax) A method for transmitting the image on a printed page from one point to another.
Page 203: High Speed
HDLC See High Level Data Link Control. High Speed 3Com' proprietary signaling scheme, design and error control protocol Technology (HST) for high-speed modems. HST incorporates trellis-coded modulation, for greater immunity from variable phone line conditions, and asymmetrical modulation for more efficient use of the phone channel at speeds of 4800 bps and above.
Page 204: Online Fallback
The protocol ensures error-free (MNP) transmission through error detection (CRC) and retransmission of errored frames. 3Com modems use MNP Levels 1-4 and Level 5 data compression. MNP Levels 1-4 have been incorporated into ITU-T Recommendation V.42. Compare HST.
Page 205 originate mode A state in which the modem transmits at the predefined low frequency of the communications channel and receives at the high frequency. The transmit/receive frequencies are the reverse of the called modem which is in Answer mode. parallel transmission The transfer of data characters using parallel electrical paths for each bit of the character, for example, 8 paths for 8-bit characters.
Page 206: Read-Only Memory (Rom)
LOSSARY Read-Only Memory Permanent memory, not user-programmable. The Business Modem's (ROM) factory settings are stored in ROM. remote access A feature that allows a remotely-located user to view the Business Modem's configuration screens and change the Business Modem's configuration. Password protection is available. remote digital A test that checks the phone link and a remote modem's transmitter loopback...
Page 207 LOSSARY stop bit The signaling bit attached to the end of each character before characters are transmitted during Asynchronous Transmission. shunt A small, plastic-and-metal piece used to cover sections of pins on a jumper. The shunt interconnects certain pins which, depending on the way the shunt is placed, determine functions.
Page 208 An ITU-T standard for modem communications. Among other things, V.25 specifies an answer tone different from the Bell answer tone. All 3Com modems can be set with the B0 command so that they use the V.25 2100 Hz tone when answering overseas calls. (Not applicable to the Business Modem.)
Page 209: Word Length
speed when line quality is impaired, and fall back further as necessary. They fall forward to the next higher speed when line quality improves. V.32 terbo Modulation scheme that extends the V.32 connection range: 4800, 7200, 9600, 12K, 14.4K, 16.8K, 19.2K, and 21.6 Kbps. V.32 terbo modems fall back to the next lower speed when line quality is impaired, and fall back further as necessary.
Page 210 LOSSARY...

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Officeconnect 56k business

3Com 56K Command Reference Manual

About this Guide

1 Connecting to Your Isp

2 Using the at Command Set

3 Modes of Operation

4 Dialing , Answering , and Hanging

5 Working with Memory

6 Controlling Result Code Displays

7 Controlling Eia-232 Signaling

8 Controlling Data Rates

9 Ccessing and

10 Dial Security

11 Flow Control

12 Handshaking , Error Control , Data Compression , and Throughput

13 Displaying Querying and Help Screens

14 Testing the Connection

15 Troubleshooting

16 Upgrading

100 C Flowcontroltemplate

Ascii Chart

Nformation for

H Viewing Led

S-REGISTERS S-Registers

J Warranty

Glossary

Quick Links

Command Reference

Troubleshooting

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Summary of Contents for 3Com 56K