3Com U.S.
This manual covers installation and operating instructions for the • 3Com U.S. Robotics 56K Professional Message Modem IMPORTANT MESSAGE: In accordance with the ITU-T standard for 56K transmissions (V.90), this modem is capable of 56 Kbps downloads. However, the download speeds you experience may be lower due to varying line conditions and other factors. Uploads from users to server equipment travel at speeds up to 31.2 Kbps. An analogue phone line compatible with the V.
Table of Contents TECHNICAL FEATURES.................................................................... 1 SUMMARY OF FEATURES ................................................................ 3 ANSWERING MACHINE FEATURES ......................................................... 5 2) FROM THE MODEM BUTTONS............................................................. 7 1) FROM THE SOFTWARE APPLICATION ................................................ 10 2) FROM THE MODEM BUTTONS................................
TECHNICAL QUICK REFERENCE....................................................51 MODEM PUSH BUTTONS .....................................................................51 TELEPHONE HANDSET DTMF DIGITS FOR REMOTE MESSAGE RETRIEVAL ........................................................................52 FRONT PANEL LIGHTS ........................................................................53 Basic Data Commands ..............................................................54 LIMITED WARRANTY ...........
Technical Features Your 56K Professional Message Modem provides many advanced features. Here are just a few : Modulation Schemes ITU-T V.90 x2™ technology ITU-T V.34 (Inc 33,600bps) ITU-T V.32bis ITU-T V.32 ITU-T V.22bis ITU-T V.22 ITU-T V.23 ITU-T V.21 Bell 212A Bell 103 Error Control and Data Compression Schemes ITU-T V.42 ITU-T V.42bis MNP 2-5 Fax Modulation Schemes ITU-T V.17 ITU-T V.29 ITU-T V.27ter ITU-T V.21 Fax Standards EIA 578 Class 1 FAX EIA 592 Class 2.
V.90 Front Channel Link Rates (Download Speeds) 28000, 29333, 30666, 32000, 33333, 34666, 36000, 37333, 38666, 40000, 41333, 42666, 44000, 45333, 46666, 48000, 49333, 50666, 52000, 53333, 54666, 56000, 57333 V.90 Back Channel Link Rates (Upload Speeds) 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 31200 V.34 Link Rates 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 31200, 33600 V.
Summary of Features Key Features of the 56K Professional Message Modem The 56K Professional Message Modem is the first product to incorporate a digital answering machine, built-in speakerphone and external modem into one design. The 56K Professional Message Modem also features a bank of flash memory that allows you to receive fax and voice messages without the intervention of the PC. Voice messages can be received even when the PC is not switched on.
• retains incoming fax and voice messages and therefore is not just a pass through device. • is capable of receiving and storing incoming fax and voice messages without any DTE (Data Terminal Equipment) intervention. • can transfer stored messages to the DTE at a later time. • enables remotely stored voice messages to be accessed through a dial-up connection or by using the push buttons on the top of the modem. • offers a built-in condenser microphone.
Answering Machine Features Before You Begin Your new Professional Message Modem is set up as an answering machine from the factory with the fax capability disabled. In order to use the fax features, a PC is necessary to adjust default settings. Also, you will need to set a password, using a PC, for use with the remote feature of the modem. Refer to the software package to choose your 4-digit password.
2. Click Stop when you have finished. 3. To listen to your message, press PLAY from the supplied software application. 4. Once you have recorded your Personal Message, click on the ‘Download’ button in order to send your Personal Message to the modem. If you pick up the handset before clicking Stop, the message will not be recorded. You cannot switch back and forth between the handset mode and the hands-free mode during the recording process. Handset mode 1.
2) from the modem buttons Hands-free mode 1. Press Rec/>> >>, hold for 2 SECONDS, listen for the tone, release the button, and recite your message. 2. Press Stop/Play when you have finished your personal message. 3. Your message will automatically play back after a tone. Note: A tone will sound if the recording limit is reached. Handset mode 1. Pick up your handset before pressing Rec/>> >>. 2. Press Rec/>> >>, hold for 2 SECONDS, listen for the tone, release the button, and recite your message. 3.
If you hang up during the recording session, your message will not be recorded. You will have three chances to enter the correct password. A tone will sound when you have incorrectly entered your password. After the third incorrect attempt, your modem automatically disconnects. Full Message Your full message can be recorded using the supplied software application. You may use either the internal microphone (hands-free mode) or the connected handset (handset mode from the application software).
Handset mode 1. Select 'Handset' as the Input device from within the Independent Mode Message Full Screen. 2. Pick up your handset before clicking Record in the software application. 3. Click Record, and recite your Full Message. Note: If the recording limit of 15 seconds is reached, the recording will stop and a dialogue window will display a warning message. 4. Click Stop when you have finished. 5. To listen to your message, press the PLAY button from within the application software. 6.
Note: Fax messages stored in memory can only be retrieved using your supplied software application. Messages can be played back through either the internal speaker (hands-free mode) or the connected handset (handset mode) from the software application and the modem buttons. Remotely, recorded messages can be played back using the handset of a remote touch-tone telephone. The number of voice messages is indicated by a tone for each new voice message.
2. Stop message playback by pressing Stop/Play again. Playback stops automatically at the end of the message(s). Handset mode 1. Pick up your handset before clicking Stop/Play. 2. Click Stop/Play to play back your message(s). 3. Hang up the handset to stop the play back of your message(s). If you want to switch to hands-free, press SPKR on the modem before you hang up the handset and continue playing the message(s). Playback stops automatically at the end of the message(s).
Note: Your PMM automatically hangs up after 5 seconds if no buttons are pressed. Deleting Messages The Professional Message Modem memory has limited space to store messages. If this limit is reached during the reception of a message, the message is cut off and flagged. No new messages will be stored until the old messages are erased. You can free up memory space in three ways: 1) Load the supplied application software to retrieve and erase all the voice and/ or fax messages in memory.
Independent Mode Facsimile (Fax) Forwarding Faxes can be forwarded to a predefined phone number. The faxes will continue to be forwarded until the feature is disabled. The faxes can be redirected to a different number at any time by changing the predefined number through the software application. The Independent mode fax forwarding feature is controlled through the software application or remotely.
#CID=0 #CID=1 #CID=2 Caller ID disabled Caller ID enabled with formatted information Caller ID enabled with unformatted information Independent Mode Toll Saver Normally the modem is set to answer after a certain number of rings, 3 to 6 in our case. When the independent mode toll saver feature is enabled via the supplied software application, the modem looks for new voice messages in flash memory. If found, the modem will answer 2 rings prior to that set by user.
Speakerphone Features The PMM works as a speakerphone when the PC is not on. You can receive incoming calls by pressing SPKR. You may use the connected handset to dial out. You can switch between handset and speakerphone at any time using SPKR. The volume up ( ) and volume down ( )are the only buttons that work during speakerphone mode; STOP/PLAY, REC/>> >> and DEL/<< << will not work in speakerphone mode.
and 1) control the volume during personal message playback in hands-free mode, 2) control the volume during message playback in hands-free mode, and 3) control the volume of the speakerphone. LED Indicators The PMM has five LEDs—two of which are bicolour (red/green). PWR/MEM 1. constant red indicates that auto-answer is off and the modem will not answer any calls when the PC is off. 2. constant green indicates that auto-answer is on and your modem is ready to accept messages when the PC is off. 3.
Before You Begin Determining your Version of Windows 95 You will need to know the version of Windows 95 you are using in order to install the modem properly. 1. Start Windows and right click My Computer on your desktop. 2. Click Properties. 3. In the “System Properties” screen, look at the system information under the General tab (circled in the following screen image). The number following the text “Microsoft Windows 95” will be “950”, “950a”, or “950b”. This refers to your version of Windows 95. 4.
External Modem Installation with Windows 95 You will need these items from your Professional Message Modem box: modem power adapter phone lead serial cable How to Connect the Modem to the Computer 1. Turn off your computer and any attached devices, such as a printer. 2. Connect the serial cable to the modem and to the computer. When looking for your serial port label on the back of your computer, select COM, MODEM, RS-232, or SERIAL. DO NOT select AUX, GAME, LPT, or PARALLEL.
WARNING: The phone socket you use must be for an ANALOGUE phone line (the type found in most homes). Many office buildings have digital phone lines. Be sure you know which type of line you have. The modem will be damaged if you use a digital phone line. 5. If you wish to use your modem and phone through the same phone wall socket, plug your telephone lead into the phone socket of the modem. It is labelled with a phone icon on the bottom of the case. Use the adapter cableincluded.
Installing the Modem Drivers NOTE: If you wrote “950b” on page 15 of this User’s Guide, go to “Installing Modem Drivers with Windows 95 Version 950b” on page 21. If you wrote “950” or “950a,” follow the instructions that begin below. Installing Modem Drivers with Windows 95 Versions 950 and 950a 1. When Windows 95 restarts, it should detect the modem. If it does, you will see the following screen. Click Driver from disk provided by hardware manufacturer. Then click OK.
3. When you see this screen, type in A:\ (If your disk drive is a different letter, type that letter instead of A.) Click OK. Windows will install the drivers for your new modem. 4. You can verify that the install was a success. When your desktop returns, click Start and scroll up to Settings. 5. Scroll over to select Control Panel.
6. Double-click Modems. 7. In the “Modems Properties” screen, you should see your modem listed. This indicates that your new Professional Message Modem is installed correctly. NOTE: If you do not see your modem listed in the preceding screen, the Plug and Play installation was unsuccessful. Please refer to the “When Plug and Play Fails” section on page 34. 8. Next, click the Diagnostics tab at the top of the “Modems Properties” screen. Write down the COM setting for your modem.
You will need to know this setting when you install fax/data communications software. Click OK. Installing Modem Drivers with Windows 95 Version 950b 1. When Windows restarts, it should detect the modem, and you should see a screen like the one below. Insert the disk and click Next. NOTE: If this screen does not appear, go to the section titled “When Plug and Play Fails” on page 34. 2. When you see the following screen, click Finish.
3. Once Windows restarts, you should verify that the modem installation was a success. When your desktop returns, click the Windows Start button and point to Settings. Then click Control Panel. 4. Double-click the Modems icon (circled in the screen image below).
5. In the “Modems Properties” screen, you should see your modem listed. This means the installation was a success. NOTE: If you do not see your modem listed in the preceding screen, the Plug and Play installation was unsuccessful. Please refer to the “When Plug and Play Fails” section on page 34. 6. Next, click the Diagnostics tab at the top of the “Modems Properties” screen. Write down the COM setting for your modem.
External Modem Installation with Windows 3.x You will need these items from your Professional Message Modem box: modem serial cable phone lead power adapter How to Connect the Modem to the Computer 1. Turn off your computer and any attached devices, such as a printer. 2. Connect the serial cable to the modem and to the computer. When looking for the serial port label on the back of your computer, look for ports labelled COM, MODEM, RS-232, or SERIAL. DO NOT select AUX, GAME, LPT, or PARALLEL.
5. If you wish to use your modem and phone through the same phone wall socket, plug your telephone lead into the phone socket on the modem. It is labelled with a phone icon on the bottom of the case. Use the adapter cable included. NOTE: You cannot use the modem and phone at the same time if they are sharing a line. 6. Turn on your modem. 7. Turn on your computer. 8. Start Windows 3.x.
Installing / Using Non-Supplied Software Your modem has been designed and tested using a wide range of communications software packages on the market. You may need to know the following information when installing communications software packages. Type of Modem Most communications software programs will ask you to select the type of modem you are using. Select a 3Com U.S. Robotics high speed modem. If that selection is not listed, pick Courier Dual Standard, V.34, or V.32bis..
Flow Control • For hardware flow control (highly recommended), select RTS/CTS. • For software flow control, select XON/XOFF. NOTE 1: Disable the type of flow control (hardware or software) that you are not using. NOTE 2: Upon exit of the non-supplied software, execute the supplied application software to re-initialise all the answer machine functionality if required. UART - Universal Asynchronous Receiver Transmitter If you are running Windows 3.x or you have upgraded your system from Windows 3.
Troubleshooting and Online Help Resources TROUBLESHOOTING AND ONLINE HELP PROBLEM DIAGNOSIS Your screen keeps displaying random garbage characters. POSSIBLE SOLUTION You may not be entering modem commands in the proper manner. Type in all upper case (AT) or lower case (at). You could have a conflict with the remote modem’s settings for word length, parity, and stop bits. Set your modem’s word length, parity, and stop bits the same as the remote modem or BBS you are calling.
PROBLEM The modem will not go off hook to dial or does not answer the phone. DIAGNOSIS POSSIBLE SOLUTION You may have plugged your modem’s phone lead into a digital line. Plugging your modem’s phone lead into a digital phone line can damage the modem. Call your phone company if you are unsure whether or not your phone line is digital. You might have a bad phone lead connection to your modem. The phone lead should be plugged into the wall plug icon socket on the modem and the wall phone socket.
PROBLEM DIAGNOSIS POSSIBLE SOLUTION The modem displays double characters on your monitor. Both the modem’s and Disable Local Echo in your software’s local character software OR on your echoes are probably turned on. modem (not both). You can turn the local echo off on the modem by typing ATE0 and pressing ENTER in your software’s terminal mode. To turn the local echo off in the software, refer to the software documentation. You may have a poor line Both modems exchange connection.
PROBLEM Your communications software is reporting many cyclic redundancy check (CRC) errors and low characters per second (CPS). DIAGNOSIS You may have a bad phone line. POSSIBLE SOLUTION Try placing the call again. The phone company routes calls differently each time. Optimum flow control settings Type this command in may not be enabled on your terminal mode to load the modem. optimum hardware flow control settings: AT&F1 and press ENTER.
PROBLEM DIAGNOSIS Errors are constantly occurring Your modem initialization in your V.17 fax transmissions. string could be insufficient for fax transmissions. Enter the following initialization string in your software setup screen: AT&H3&I2&R2S7=90 and press ENTER. The standard string for faxing is AT&F1S36=0. There may be a Terminate and Stay Resident (TSR) program (such as a screen saver or virus scanner) running in the background, disrupting data communications.
PROBLEM The computer or software will not recognize the modem. DIAGNOSIS POSSIBLE SOLUTION You may not be entering modem commands in the proper manner. Type in all upper case (AT) or all lower case (at). If you are using an external modem, the COM port may not be enabled. Refer to your computer’s manual for information concerning enabling COM ports (usually involves altering the bios settings, motherboard jumpers, and the operating system).
When Plug and Play Fails Try the following possible solutions: 1. Click Windows 95 Start and click Shut Down. When asked if you wish to shut down your computer, click Yes. When Windows 95 indicates that it is safe to turn off your computer, turn it off and wait 15 seconds. Then turn the computer back on. Windows 95 may detect your modem upon this restart even if it did not detect the modem during the initial installation.
Contacting 3Com Technical Support To connect to the 3Com Bulletin Board System, follow these steps: 1. Start your communications software. The software settings for the BBS are as follows: ANSI terminal emulation Data Bits: 8 Parity: None Stop Bits: 1 2. Put your computer in Terminal mode. Enter the following command: ATDT 01189692200 3. If this is your first time connecting to our BBS, you will be asked to enter your name and a password, as well as fill out a questionnaire. 4.
World Wide Web A 3Com Home Page containing the same information as the Internet on Demand listing as well as information about the 3Com products. Logon to http://www.3com.co.uk. Bulletin Board System The 3Com BBS provides answers to the most commonly asked technical and non-technical questions. BBS 0118 9692200 Fax and Technical Support Hotline Technical questions about 3Com modems can also be answered via fax or by technical support representatives.
Are You Still Having Problems? Should you encounter any difficulties with your 56k Professional Message modem, refer to the manual first. Call or visit your dealer, if they are unable to assist you, contact the 3Com Technical Support Department from Monday through to Friday, during normal office hours on; Email address: uk_modemsupport@3com.com BBS: 0118 969 2200 FOD*: 0870 844 4546 Fax: 0870 844 4547 Tel: 0870 844 4546 Web site: http://www.3com.co.
Glossary Cross references are printed in boldface. Cross references with items in the Command Summary, found in the “Technical Quick Reference” section, are printed in italics. analogue loopback A modem self-test in which data from the keyboard or an internal test pattern is sent to the modem's transmitter, turned into analogue form, looped back to the receiver, and converted back into digital form.
asynchronous transmission Data transmission in which the length of time between transmitted characters may vary. Since 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. The addition of start/stop bits to each character serves this purpose. auto answer In this setting the modem can pick up the phone line when it detects a certain number of rings.
buffer A memory area set aside to be used as temporary storage during input and output operations. An example is the modem's command buffer. byte A group of binary digits stored and operated upon as a unit. In user documentation, the term usually refers to 8-bit units or characters. One kilobyte (KB) is equal to 1,024 bytes or characters; 640KB indicates 655,360 bytes or characters. carrier A tone signifying a connection the modem can alter to communicate data across telephone lines.
data communications A type of communications in which computers are able to exchange data over an electronic medium. data compression table A table containing values assigned for each character during a call under MNP5 data compression. Default values in the table are continually altered and built during each call: The longer the table, the more efficient throughput gained. data mode The mode in which the faxmodem is capable of sending and receiving data files.
digital signals Signals that are discrete and uniform. In this manual, the term refers to the binary digits 0 and 1. These signals are in contrast with analogue signals. DTE Data Terminal (or Terminating) Equipment is a computer that generates or is the final destination of data. duplex Indicates a communications channel capable of carrying signals in both directions. See half duplex, full duplex.
full duplex These signals will flow in both directions at the same time over one line. In microcomputer communications, may refer to the suppression of the online local echo. half duplex These signals will flow in both directions, but only one way at a time. In microcomputer communications, may refer to activation of the online local echo, which causes the modem to send a copy of the transmitted data to the screen of the sending computer.
local echo A modem feature that enables the modem to display keyboard commands and transmitted data on the screen. See command En. MNP Microcom Networking Protocol is an error-control protocol developed by Microcom, Inc., and now in the public domain. There are several different MNP protocols, but the most commonly used one ensures error-free transmission through error detection (CRC) and retransmission of erred frames.
parity A simple error-detection method that checks the validity of a transmitted character. Character checking has been surpassed by more reliable and efficient forms of error checking, including V.42 and MNP 2-4 protocols. Either the same type of parity must be used by two communicating computers, or both may omit parity. protocol A system of rules and procedures governing communications between two or more devices.
terminal A device whose keyboard and display are used for sending and receiving data over a communications link. This device differs from a microcomputer or a mainframe in that it has little or no internal processing capabilities. terminal mode Software mode that allows direct communication with the modem. This mode is also known as command mode.
V.29 This is the ITU-T standard for facsimile operations that specifies modulation at 9600 bps, with fallback to 7200 bps. V.32 This is the ITU-T standard for modem communications at 9600 bps and 4800 bps. V.32 modems fall back to 4800 bps when line quality is impaired. V.32 bis This is the ITU-T standard that extends the V.32 connection range: 4800, 7200, 9600, 12,000, and 14,400 bps. V.
Xmodem This is the first of a family of error control software protocols used to transfer files between modems. These protocols are in the public domain and are available from many bulletin board services. XON/XOFF These are standard ASCII control characters used to tell an intelligent device to stop/resume transmitting data. Ymodem This is an error-checking protocol that can send several files of data at a time in 1024-byte (1K) blocks. This protocol can use either checksums or CRC for error checking.
Technical Quick Reference Modem Push Buttons Symbol Meaning Function SPKR Speakerphone 1) answer incoming calls as a speakerphone 2) switch between speakerphone and handset modes 3) switch between hands-free and handset modes during playback STOP/ PLAY Stop/Play 1) start and stop the playback of voice messages 2) stop recording your personal message 3) stop playback of your personal message Manual Fax Receive 4) upon answering an incoming fax call via the attached handset or SPKR, depress STOP/PLAY fo
Telephone handset DTMF digits for Remote Message Retrieval Digit(s) Function 1 starts playback of all new voice messages 2 starts playback of all stored voice messages (new and old) 3 skips to the next voice message 44 deletes old voice messages in memory 5 not used 6 repeats the current voice message 7 records personal message 8 not used 9 repeats the new message count 0 1) stops playback of all voice messages 2) stops the recording of your personal message 3) stops playback of your pe
Front Panel Lights Symbol Meaning Status PWR/ MEM Power/ Message Memory Bicolour LED: 1) constant red indicates that auto-answer is off and the modem will not answer any calls when the PC is off. 2) constant green indicates that auto-answer is on and the modem is ready to receive voice and fax messages when the PC is off.
Typing Commands • Type commands in either upper or lower case, not a combination. Use the Backspace key to delete errors. (You cannot delete the original AT command, since it is stored in the modem buffer.) • If a command has numeric options and you do not include a number, zero is assumed. For example, if you type ATB, the command ATB0 is assumed. • Every command except A/, A>, and +++ must begin with the AT prefix and be entered by pressing ENTER. • The maximum command length is 58 characters.
AT Required command prefix, except with A/, +++, and A>. Use alone to test for OK result code. Bn U.S./ITU-T answer sequence B0 ITU-T answer sequence B1 U.S. answer tone Dn Dials the specified phone number, includes the following: 0-9 #, * L P R Sn T , ; ! / W @ $ Numeric digits Extended touch-tone pad tones Dials the last dialed number Pulse (rotary) dial Originates call using answer (reverse) frequencies Dials the phone number string stored in NVRAM at position n (n = 0−3).
Hn Controls ON/OFF hook H0 Hangs up (goes on hook) H1 Goes off hook In Displays the following information I0 Four-digit product code I1 Results of ROM checksum I2 Results of RAM checksum I3 Product type I4 Current modem settings I5 Nonvolatile memory (NVRAM) settings I6 Link diagnostics I7 Product configuration I9 Plug and Play information I11 Extended link diagnostics Ln Controls speaker volume L0 Lowest volume L1 Low volume L2 Medium volume L3 High volume Mn Operates speaker M0 Speaker always OFF M
Sr.b=n Sets bit .
Xn Sets result code displayed.
Xn (Continued) Result Codes 256/CONNECT 28000 260/CONNECT 29333 264/CONNECT 30666 268/CONNECT 32000 180/CONNECT 33333 272/CONNECT 34666 276/CONNECT 36000 184/CONNECT 37333 280/CONNECT 38666 284/CONNECT 40000 188/CONNECT 41333 192/CONNECT 42666 196/CONNECT 44000 200/CONNECT 45333 204/CONNECT 46666 208/CONNECT 48000 212/CONNECT 49333 216/CONNECT 50666 220/CONNECT 52000 224/CONNECT 53333 228/CONNECT 54666 232/CONNECT 56000 236/CONNECT 57333 Adaptive Dialling Wait for 2nd Dial Tone (W) Wait for Answer (@) Fast
Yn Selects power-on/reset default configuration Y0 Use profile 0 setting in NVRAM Y1 Use profile 1 setting in NVRAM Y2 Use factory configuration 0 (&F0) Y3 Use factory configuration 1 (&F1) Y4 Use factory configuration 2 (&F2) Z Resets modem Z0 Resets modem to NVRAM profile selected by Y command Z1 Resets modem to NVRAM profile 0 Z2 Resets modem to NVRAM profile 1 Z3 Resets modem to factory default profile 0 (&F0) Z4 Resets modem to factory default profile 1 (&F1) Z5 Resets modem to factory default profi
&Dn Controls Data Terminal Ready (DTR) operations &D0 DTR override &D1 DTR toggle causes online Command mode &D2 Normal DTR operations &D3 Resets on receipt of DTR &Fn Loads a read-only (non-programmable) factory configuration &F0 Generic template, no flow control. &F1 Hardware flow control template &F2 Software flow control template &Gn Sets Guard Tone &G0 No guard tone, U.S. and Canada &G1 550 Hz guard tone, some European countries, requires B0 setting &G2 1800 Hz guard tone, U.K.
&M5 &Nn 62 ARQ mode Sets connect speed. If connection cannot be established at this speed, the modem will hang up. When used in conjunction with &Un and &Un is greater than 0, &Nn sets the ceiling connect speed. &Un sets the floor speed, see &Un.
&N34 &N35 &N36 &N37 &N38 &N39 50,666 bps 52,000 bps 53,333 bps 54,666 bps 56,000 bps 57,333 bps &Pn Sets pulse (rotary) dial make/break ratio &P0 U.S./Canada ratio, 39%/61% &P1 U.K.
&Un Sets floor connect speed when set above 0. If the connection cannot be established above this speed, the modem will hang up. When &Un is used in conjunction with &Nn and &Nn is greater than 0, &Nn is the ceiling connect speed &U=0 &U>0 &U0 &U1 &U2 &U3 &U4 &U5 &U6 &U7 &U8 &U9 &U10 &U11 &U12 &U13 &U14 &U15 &U16 &U17 &U18 &U19 64 &N=0 Connects at best possible speed between your modem and the remote modem. NOTE: These factory default settings should be sufficient for most users.
&U20 &U21 &U22 &U23 &U24 &U25 &U26 &U27 &U28 &U29 &U30 &U31 &U32 &U33 &U34 &U35 &U36 &U37 &U38 &U39 32000 bps 33,333 bps 34666 bps 36000 bps 37,333 bps 38666 bps 40000 bps 41,333 bps 42,666 bps 44,000 bps 45,333 bps 46666 bps 48000 bps 49333 bps 50666 bps 52000 bps 53333 bps 54666 bps 56000 bps 57333 bps &Wn &W0 &W1 Writes current configuration to NVRAM templates Modifies the NVRAM 0 template (Y0) Modifies the NVRAM 1 template (Y1) &Yn &Y0 &Y1 &Y2 &Y3 Sets break handling Destructive, but doesn’t send b
&ZL? Displays the last executed dial string +++ Escapes to online-command mode +MCA Enable/disable the PMM answer machine feature. +MCA=1 Enable the answer machine feature. +MCA=0 Disable the answer machine feature. +MCA? Report disabled/enabled status of the PMM answer machine feature. 1 Answer machine feature enabled. 0 Answer machine feature disabled.
S-Registers To change a setting, use the ATSr=n command, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated). Register Default S0 0 Function Sets the number of rings on which to answer in Auto Answer Mode. When set to 0, Auto Answer is disabled. Note: If ERROR is reported when setting S0 above 0, send the command AT+MCA=0 .
Register Default Function S8 2 Sets the duration, in seconds, for the pause (,) option in the Dial command. S9 6 Sets the required duration, in tenths of a second, of the remote modem’s carrier signal before recognition by the U.S. Robotics modem. S10 14 Sets the duration, in tenths of a second, that the modem waits to hang up after loss of carrier. This guard time allows the modem to distinguish between a line disturbance from a true disconnect (hang up) by the remote modem.
Register Default Function S13 Bit-mapped register. Select the bit(s) you want on and set S13 to the total of the values in the Value column. For example, ATS13 = 17 enables bit 0 (value is 1) and bit 4 (value is 16). 0 Bit 0 1 Value 1 2 2 3 4 8 4 16 5 6 7 32 64 128 Result Reset when DTR drops Reset non-MNP transmit buffer from 1.
Register Default Function S14 0 Reserved S15 0 Bit-mapped register setup. To set the register, see instructions for S13. Bit 0 1 2 Value 1 2 4 Result Disable ARQ/MNP for V.22 Disable ARQ/MNP for V.22bis Disable ARQ/MNP for V.32/V.32bis/V.32terbo 3 8 Disable MNP handshake 4 16 Disable MNP level 4 5 32 Disable MNP level 3 6 64 MNP incompatibility 7 128 Disable V.42 operation To disable V.
Register Default Function S21 10 Sets the length, in 10-millisecond units, of breaks sent from the modem to the computer; applies to MNP or V.42 mode only. S22 17 Stores the ASCII decimal code for the XON character. S23 19 Stores the ASCII decimal code for the XOFF character. S24 0 Reserved S25 20 Sets the duration, in hundredths of a second, that DTR must be dropped so that the modem doesn’t interpret a random glitch as a DTR loss.
Register Default Function 7 S28 0 8 128 Software compatibility mode. This setting disables the codes and displays the 9600 code instead. The actual rate of the call can be viewed on the ATI6 screen Used for unusual software incompatibilities. Some software may not accept 7200, 12,000, and 14,400 bps or greater result codes. Eliminates the V.32 answer tones for a faster connection. Default item, all times are in tenths of seconds. 255 Disables all connections except V.32 at 9600 bps.
Register Default Function S33 S34 S35-S37 0 0 Bit-mapped register setup. To set the register, see the instructions for S13. Bit Value Result 0 1 2 3 4 5 6 7 1 2 4 8 16 32 64 128 Disable 2400 symbol rate Disable 2743 symbol rate Disable 2800 symbol rate Disable 3000 symbol rate Disable 3200 symbol rate Disable 3429 symbol rate Reserved Disable shaping Bit-mapped register setup. To set registers, see instructions for S13.
Register Default Function S38 0 Sets an optional delay, in seconds, before a forced hang-up and clearing of the Transmit buffer when DTR drops during an ARQ call. This allows time for a remote modem to acknowledge receipt of all transmitted data before it is disconnected. The modem immediately hangs up when DTR drops. This option only applies to connections terminated by dropping DTR. If the modem receives the ATH command, it ignores S38 and immediately hangs up.
Fax Commands +FCLASS=n Sets the mode of operation FCLASS=0 Data mode FCLASS=1 Group 3 Facsimile Service Class 1 mode FCLASS=2.0 Group 3 Facsimile Service Class 2.0 mode FCLASS? Displays the current FCLASS mode (See mode descriptions above) +FCLASS=? Displays the FCLASS mode options (See mode descriptions above) +FTS=n Stops the fax transmission. Then the modem waits for a specified time before OK appears on screen. The pause is set in 10 millisecond intervals.
+FTH=n Transmits data framed in the HDLC protocol using the modulation specified by n. (n = 3, 24, 48, 72, 96, 97, 98,121, 122, 145, or 146) Note: See the “Screen Messages” table at the end of this section for an explanation of messages that appear in response to this command. +FRH=n Receives data framed in the HDLC protocol using the modulation specified by n.
The Serial Interface (Cable Information) The serial interface is a standard developed by the Electronic Industries Association (EIA). It defines the signals and voltages used when data is exchanged between a computer and a modem or serial printer. The entire standard covers many more functions than are used in most data communications applications.
Limited Warranty 3Com Europe Limited warrants to the original consumer or other end user that this product is free from defects in materials or workmanship for the life of the modem. During the warranty period, and upon proof of purchase, the product will be repaired or replaced (with the same or similar model) at our option, without charge for either parts or labour. This warranty shall not apply if the product is modified, tampered with, misused or subjected to abnormal working conditions.
CE Compliance Electromagnetic Compatibility This device complies with the following standards in accordance with European Directive 89/336/EEC: Immunity EN 50082-1 06/92 Emission EN 55022 class B 08/87 Safety (Low Voltage Directive) This device complies with the following standards in accordance with European Directives 91/263/EEC and 91/263/EEC: EN 60950/A4 03/97 The ports on this device have the following safety status: Telephone line connector: TNV-2 All other ports: SELV These definitions are classifie
Network Compatibility Declaration This equipment is designed to work satisfactorily on all European Union PSTN networks. This equipment is supplied with a suitable PSTN connector for the country in which it was supplied. If it is required to use this equipment on a different network to the one for which it was supplied, the user is advised to contact the vendor for guidance regarding connection.
