3Com U.S. Robotics 56K Voice User Manual Download

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56K FAXMODEM

User’s Guide and Reference

Summary of Contents for U.S. Robotics 56K Voice

Page 1: ...56K FAXMODEM User s Guide and Reference ...

Page 2: ... to update the information contained herein 3Com the 3Com logo and U S Robotics are registered trademarks of 3Com Corporation Windows is a registered trademark of Microsoft Corp Any other trademarks trade names service marks or service names owned or registered by any other company and used in this manual are the property of their respective owners Copyright 1998 3Com Corporation All rights reserv...

Page 3: ...alling Modem Drivers with Windows 95 Versions 950 and 950a Moving Through the New Hardware Found Screens 6 Version 950b Using the Update Device Driver Wizard Screens 11 Installing Modem Drivers with Windows 98 15 External Modem Installation with Windows 3 x 18 Software Installation 20 Windows 95 20 Windows 3 x 20 Type of Modem 21 Initialisation String 21 Flow Control 21 UART Universal Asynchronous...

Page 4: ...mmands 46 Extended Data Commands 54 S Registers 62 Fax Commands 70 Screen Messages 72 The Serial Interface 73 Serial Interface Pin Definitions 74 Regulatory Information 75 CE Compliance 75 Electromagnetic Compatibility 75 Safety Low Voltage Directive 75 Operation of pan European modems 75 Limited Warranty 77 Contact details 81 ...

Page 5: ...andard or 3Com 56K technology 3Com is working with providers everywhere to quickly upgrade their service to the ITU V 90 standard In accordance with the ITU standard for V 90 transmissions 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 3...

Page 6: ... V 23 ITU T V 21 Error Control and Data Compression Schemes ITU T V 42 ITU T V 42 bis 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 0 FAX 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 ...

Page 7: ...0 12000 14400 Flash ROM Upgradable 56K Faxmodem supports software download through flash memory You can obtain the latest features by downloading updates quickly and easily Front Panel Lights PWR Power The modem is turned on CD Carrier Detect ON if modem receives a valid data signal carrier from a remote modem indicating that data transmission is possible Always ON if CD override is ON C0 RD Recei...

Page 8: ...ble Determining Your Version of Windows 95 1 Click the My Computer icon on your desktop with the right mouse button 2 Click Properties 3 In the System Properties screen look at the system information under the General tab circled in the screen image The number following the text Microsoft Windows 95 will end with 950 950a or 950b This indicates your version of Windows 95 ...

Page 9: ...ou selected This information will be necessary when installing your communications software 3 Plug one end of the phone cord into the TELCO socket and the other end into a phone wallsocket The phone wall socket you use must be for an ANALOGUE phone line Most office phones are wired through DIGITAL lines Be sure you know which type of line you have The modem will be damaged if you use a digital pho...

Page 10: ... and peripherals back into the computer and turn on the computer 7 Start Windows 95 Installing Modem Drivers with Windows 95 Versions 950 and 950a Moving Through the New Hardware Found Screens 1 When Windows 95 restarts it should detect the modem If it does you will see the following screen ...

Page 11: ... Modem 2 When you see the Install from Disk screen If you have a disk that contains your modem s drivers insert the disk into your disk drive usually A If you have a CD ROM that contains your modem s drivers insert the CD ROM into your CD ROM drive usually D If your disk drive or CD ROM drive is a different letter type that letter instead of A or D Click OK Windows will install the drivers for you...

Page 12: ...s finishes loading the information from the disk or CD ROM 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 ...

Page 13: ...nstallation was a success If this screen does not appear refer to If Plug and Play Does Not Detect Your Modem on page 30 6 Next click the Diagnostics tab at the top of the Modems Properties screen Write down the COM setting for your modem in the space below You may need to know this setting when you install your communications software COM Port___________ ...

Page 14: ...odem s status screens should appear in the box Click OK Be sure to install software after the modem is installed Turn to Software Installation on page 20 for information about installing communications software Congratulations You are ready to start using your 3Com U S Robotics Faxmodem ...

Page 15: ...you have a disk that contains your modem s drivers insert the disk into your disk drive usually A If you have a CD ROM that contains your modem s drivers insert the CD ROM into your CD ROM drive usually D If your disk drive or CD ROM drive is a different letter type that letter instead of A or D Click Next If this screen does not appear refer to If Plug and Play Does Not Detect Your Modem on page ...

Page 16: ...2 2 When you see the following screen click Finish Windows will copy files to your hard drive 3 When Windows is finished copying files verify that the modem installation was a success Click the Windows Start button and point to Settings Then click Control Panel ...

Page 17: ...ation with Windows 95 and Windows 98 13 4 Double click the Modems icon circled in the screen image below 5 In the Modems Properties screen you should see a description of your modem This means the installation was a success ...

Page 18: ...n the COM setting for your modem in the space You may need to know this setting when you install your communications software COM Port_________ 7 Click More Info The modem s status screens should appear in the box Click OK Be sure to install software after the modem is installed Turn to Software Installation for information about installing communications software Congratulations You are ready to ...

Page 19: ...d Windows 98 15 Installing Modem Drivers with Windows 98 1 When you see this screen Windows has detected the modem 2 Click Next If this screen does not appear refer to If Plug and Play Does Not Detect Your Modem 3 When you see the following screen ...

Page 20: ...and insert the disk into your disk drive 4 The next screen tells you that Windows has found the driver for your modem Click Next 5 Click Finish 6 When Windows is finished copying files you should verify that the modem installation was a success Click the Windows Start button and point to Settings Then click Control Panel 7 Double click the Modems icon 8 In the Modems Properties screen you should s...

Page 21: ...dems Properties screen Write down the COM setting for your modem in the following space You may need to know this setting when you install your communications software COM Port_________ Turn to Software Installation for information about installing communications software Also refer to the manual of the communications software for instructions on installation After you install your communications ...

Page 22: ... a printer monitor keyboard mouse 2 Connect the serial cable to the modem and to the computer When looking for the serial port on the back of your computer look for ports labeled COM MODEM RS 232 or SERIAL Do not select AUX GAME LPT or PARALLEL Remember which serial port you selected This information will be necessary when installing your communications software 3 Plug one end of the phone cord in...

Page 23: ...nd insert its plug into the power socket on the modem If you want to use a telephone on the same line use a splitter arrangement You cannot use the modem and a phone at the same time if they share the same telephone line 6 Plug the power cords cables and peripherals back into the computer and turn on the computer 7 Start Windows 3 x Be sure to install software after the modem is installed Turn to ...

Page 24: ...enter a new world of information and entertainment Windows 95 1 Insert the communications software disk or CD ROM into your disk drive or CD ROM drive 2 Go to the Windows Start menu and select Run 3 In the Run dialog box type A install exe or D install exe and press ENTER If your disk drive or CD ROM drive is a different letter type that letter instead of A or D 4 Then click OK 5 Follow the on scr...

Page 25: ...selection is not listed pick Courier Dual Standard V 32 bis or V 34 Initialisation String For hardware flow control a fixed serial port rate and full result codes type AT F1 and then press ENTER If you must use software flow control type AT F2 and then press ENTER Flow Control For hardware flow control highly recommended select RTS CTS For software flow control select XON XOFF Disable the type of ...

Page 26: ...l rate in any fax data programs you use If this is your UART Select this serial rate 16550 115 2 or 57 6 Kbps 16450 38 4 Kbps 8250 19 2 Kbps Do not select a 28 800 14 400 or 12 000 bps serial port rate if offered Your modem will not work correctly with any of these settings Fix or lock the serial port baud rate If it s referred to as autobaud select OFF Congratulations You are now ready to start u...

Page 27: ...Down select the Shut down the computer option and then click Yes When your computer has shut down turn it off and unplug it from its power outlet Unplug its serial cable from the computer s COM port Reinstall your modem following the directions in the External Modem Installation with Windows 95 chapter but use a different COM port 5 Click More Info You should see a list of the modem s ATI commands...

Page 28: ...e at POSSIBLE SOLUTION The COM port may not be enabled Refer to your computer s manual for information about enabling COM ports usually involves altering the bios settings motherboard jumpers and the operating system POSSIBLE SOLUTION You may be using the wrong serial cable with your external faxmodem Make sure you are using an RS 232 modem cable You will need to make sure you are using a 25 pin m...

Page 29: ...N You might have a bad phone cord connection to your modem The phone cord should be plugged into the phone socket on the modem and the wall phone socket The phone cord should be no longer than 12 feet in length Use the phone cord included with your modem if possible POSSIBLE SOLUTION You may have devices between the modem and the wall socket There should be no line splitters fax machines or other ...

Page 30: ...inal mode type ATS0 1 and press ENTER You need to enable auto answer before every session unless you alter your software s initialisation string to permanently enable auto answer POSSIBLE SOLUTION You may be using the wrong power adaptor for your modem Use only the power adaptor that came with your modem PROBLEM Both modems sound like they are exchanging carrier signals but fail to establish a con...

Page 31: ... or corporate host site compatible with ITU T V 90 or 3Com 56K technology are necessary for these high speed downloads Check http www 3com com 56k for a list of ISPs that observe ITU T V 90 and or offer 3Com 56K technology POSSIBLE SOLUTION Your phone line may not be capable of transferring data at the full 56K but V 90 and 3Com 56K technology operate at a range of speeds and will use the highest ...

Page 32: ...isrupting data communications Disable any Terminate and Stay Resident TSR programs running in the background If you have software running as a TSR check the software s manual for information about disabling its ability to operate as a TSR POSSIBLE SOLUTION Your baud rate may be set too high In your communications software lower the baud rate to 9600 7200 or 4800 POSSIBLE SOLUTION You may be trying...

Page 33: ...nitialise the modem POSSIBLE SOLUTION Your software s port settings may be incorrect Make sure the software s port settings match those for your modem POSSIBLE SOLUTION Make sure the modem is plugged in and turned on Use only the power adaptor included with the modem ...

Page 34: ...ck Shut Down 2 When asked if you wish to shut down your computer click Yes 3 When Windows indicates that it is safe to turn off your computer turn it off 4 Wait 15 seconds before turning the computer back on 5 Windows may detect your modem upon this restart even if it did not detect the modem during the initial installation If you see screens indicating that new hardware has been detected by Windo...

Page 35: ...echnical assistance If you do see one of these options double click the option and continue with step 12 12 If the description that appears matches the modem you are trying to install click Remove If it does not contact customer support for technical assistance 13 Click OK when Windows asks if you wish to remove the device 14 Restart the computer and continue with the on screen instructions If the...

Page 36: ...d of a voice over the phone line These signals are in contrast with digital signals answer mode The mode used by your modem when answering an incoming call from an originating modem The transmit receive frequencies are the reverse of the originating modem which is in originate mode application A computer program designed to perform a specific function such as a word processing or organizing data i...

Page 37: ... followed by the telephone number to dial Autodial is used to dial voice numbers See command Dn baud rate A term used to measure the speed of an analogue transmission from one point to another Although not technically accurate baud rate is commonly used to mean bit rate binary digit A 0 or 1 which reflects the use of the binary numbering system It is used because the computer recognizes either of ...

Page 38: ...ta across telephone lines character A representation coded in binary digits of a letter number or other symbol characters per second CPS A data transfer rate generally estimated from the bit rate and the character length For example at 2400 bps 8 bit characters with start stop bits for a total of ten bits per character will be transmitted at a rate of approximately 240 characters per second cps So...

Page 39: ...NP5 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 A standard modem without fax capabilities is always in data mode DCE Data Communications Equipment or Circuit Terminating Equipment is equipment such as d...

Page 40: ...gnals 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 Duplex indicates a communications channel capable of carrying signals in both directions See half duplex full duplex Electronic Industries Association EIA This association is a group which defines electronic standards in the U S error contro...

Page 41: ...s 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 Hz Hertz is a freq...

Page 42: ...fferent MNP protocols but the most commonly used one ensures error free transmission through error detection CRC and retransmission of erred frames modem A device that transmits receives computer data through a communications channel such as radio or telephone lines It also changes signals received from the phone line back to digital signals before passing them to the receiving computer nonvolatil...

Page 43: ...ror 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 Protocols vary but communicating devices must follow the same protocol in order to exchange data The format of the data readiness to receive or send error d...

Page 44: ...ter the character is transmitted during asynchronous transmission 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 co...

Page 45: ...ard for modem communications at 2400 bps The standard includes an automatic link negotiation fallback to 1200 bps and compatibility with Bell 212A V 22 modems V 23 An ITU T standard for modem communication at 1200 bps with a 75 bps back channel V 27ter An ITU T standard for facsimile operations that specifies modulation at 4800 bps with fallback to 2400 bps V 29 An ITU T standard for facsimile ope...

Page 46: ...bps V 42 An ITU T standard for modem communications that defines a two stage process of detection and negotiation for LAPM error control V 42 bis An extension of ITU T V 42 that defines a specific data compression scheme for use during V 42 connections V 90 The ITU T standard for 56 Kbps modem communications Xmodem The first of a family of error control software protocols used to transfer files be...

Page 47: ...se either checksums or CRC for error checking Ymodem G This is similar to the Ymodem except it relies on the modem for error checking which makes it faster Zmodem This is similar to Xmodem and Ymodem except it includes batch transfer the ability to recover from a partially complete transfer an autostart feature and improved efficiency ...

Page 48: ...etect ON if modem receives a valid data signal carrier from a remote modem indicating that data transmission is possible Always ON if CD override is ON C0 RD Received Data Flashes when modem sends result codes or passes received data bits from remote SD Send Data Flashes when computer sends a data bit to modem ...

Page 49: ...s 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 and A must begin with the AT prefix and be entered by pressing ENTER The maximum command length is 58 characters This does not include the AT prefix carriage returns or spaces All defaults are based on the F1 Hardware Flow Control template loaded in NVRAM...

Page 50: ... a basic command list online help A Manual Answer goes off hook in answer mode Pressing any key aborts the operations A Re executes the last issued command Used mainly to redial This does not require the AT prefix or a Carriage Return A Re executes the last issued command continuously until the user intervenes or the command is executed forever Does not require the AT prefix or a Carriage Return ...

Page 51: ...otary dial R Originates call using answer reverse frequencies Sn Dials the phone number string stored at position n n 0 3 Phone numbers are stored with the Zn s command T Tone dial Dn Continued Comma Pause see the definition of the S8 register to which it is linked Semicolon Return to Command mode after dialling Exclamation point Flashes the switch hook Back Slash Delays for 125 ms before proceedi...

Page 52: ...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 Stored memory settings I6 Link diagnostics I7 Product configuration I9 Plug and Play information I11 Extended link diagnostics Ln Speaker Volume L0 Lowest Speaker Volume L1 Low Speaker Volume L2...

Page 53: ...resses result codes Q0 Displays result codes Q1 Quiet mode no result codes Q2 Displays result codes only in Originate mode Sr b n Sets bit b of register r to n 0 OFF or 1 ON Sr n Sets register r to n Sr Displays contents of S Register r S Displays a list of the S Registers Vn Displays verbal numeric result codes V0 Numeric codes V1 Verbal codes ...

Page 54: ...X0 X1 X2 X3 X4 0 OK 1 CONNECT 2 RING 3 NO CARRIER 4 ERROR 5 CONNECT 1200 6 NO DIAL TONE 7 BUSY 8 NO ANSWER 9 Reserved 10 CONNECT 2400 13 CONNECT 9600 18 CONNECT 4800 20 CONNECT 7200 21 CONNECT 12000 25 CONNECT 14400 43 CONNECT 16800 85 CONNECT 19200 Requires in dial string replaces NO CARRIER ...

Page 55: ...600 99 CONNECT 24000 103 CONNECT 26400 107 CONNECT 28800 151 CONNECT 31200 155 CONNECT 33600 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 ...

Page 56: ...3 X4 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 Adaptive Dialling Wait for 2nd Dial Tone W Wait for Answer Fast Dial ...

Page 57: ...y configuration 0 F0 Y3 Use factory configuration 1 F1 Y4 Use factory configuration 2 F2 Z Resets modem Z0 Resets modem to profile selected by Y command Z1 Resets modem to profile 0 Z2 Resets modem to 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 profile 2 F2 ...

Page 58: ...s modem s serial port rate B0 Variable follows connection rate B1 Fixed serial port rate B2 Fixed in ARQ mode variable in non ARQ mode Cn Controls Carrier Detect CD signal C0 CD override C1 Normal CD operations 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 program...

Page 59: ...disabled H1 Hardware flow control Clear to Send CTS H2 Software flow control Xon Xoff H3 Hardware and software flow control In Sets Receive Data RD software flow control see also Rn I0 Software flow control disabled I1 Xon Xoff signals to your modem and remote system I2 Xon Xoff signals to your modem only Kn Enables disables data compression K0 Data compression disabled K1 Auto enable disable K2 D...

Page 60: ...peed 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 connect speed See also the table in the Un section Note N17 through N39 apply only to V 90 products N0 Connection speed is determined by the remote modem N1 300 bps N2 1200 bps N3 2400 bps N4 4800 bps N5 7200 bps N6 9600 bps N7 12 000 bps N8 14 400 bps N9 16 800...

Page 61: ...29 44 000 bps N30 45 333 bps N31 46 666 bps N32 48 000 bps N33 49 333 bps N34 50 666 bps N35 52 000 bps N36 53 333 bps N37 54 666 bps N38 56 000 bps Pn Sets pulse rotary dial make break ratio P0 U S Canada ratio 39 61 P1 U K ratio 33 67 Rn Sets Receive Data RD hardware flow control Request to Send RTS see also Hn R0 Reserved R1 Modem ignores RTS R2 Received Data to computer only on RTS Sn Controls...

Page 62: ...logue Loopback T2 Reserved T3 Local Digital Loopback T4 Enables Remote Digital Loopback T5 Prohibits Remote Digital Loopback T6 Initiates Remote Digital Loopback T7 Remote Digital with self test and error detector T8 Analogue Loopback with self test and error detector ...

Page 63: ...ll hang up This command can also be used in conjunction with Nn Note U17 through U39 apply only to V 90 products N 0 N 0 U 0 Connects at best Attempts a connection at the speed possible speed defined by Nn between your modem and the remote modem Note These factory default settings should be sufficient for most users U 0 Connects at any speed Connects at any faster than the value speed between Un N...

Page 64: ...ps U11 21 600 bps U12 24 000 bps U13 26 400 bps U14 28 800 bps U15 31 200 bps U16 33 600 bps U17 28 000 bps U18 29 333 bps U19 30 666 bps U20 32 000 bps U21 33 333 bps U22 34 666 bps U23 36 000 bps U24 37 333 bps U25 38 666 bps U26 40 000 bps U27 41 333 bps U28 42 666 bps U29 44 000 bps U30 45 333 bps U31 46 666 bps U32 48 000 bps U33 49 333 bps U34 50 666 bps U35 52 000 bps U36 53 333 bps U37 54 ...

Page 65: ...ctive expedited Y3 Nondestructive unexpedited Zn sWrites phone number string s at position n n 0 3 Zn L Writes last executed dial string at position n n 0 3 Zn Displays the phone number stored at position n n 0 3 ZL Displays the last executed dial string CID n Controls Caller ID feature CID 0 Caller ID disabled CID 1 Caller ID enabled with formatted information CID 2 Caller ID enabled with unforma...

Page 66: ...er than 0 S2 43 Stores the ASCII decimal code for the escape code character Default character is A value of 128 255 disables the escape code S3 13 Stores the ASCII code for the Carriage Return character Valid range is 0 127 S4 10 Stores the ASCII decimal code for the Line Feed character Valid range is 0 127 S5 8 Stores the ASCII decimal code for the Backspace character A value of 128 255 disables ...

Page 67: ...he remote modem Note If you set S10 255 the modem will not hang up when carrier is lost Dropping DTR hangs up the modem S11 72 Sets the duration and spacing in milliseconds for tone dialling S12 50 Sets the duration in fiftieths of a second of the guard time for the escape code sequence S13 0 Bit mapped register Select the bit s you want on and set S13 to the total of the values in the Value colum...

Page 68: ...modems keep data you are sending from scrolling off their screens When remote users send your computer an Xoff Ctrl S and you stop transmitting the data in transit from your modem s buffer does not exceed the size of their screen This is also very helpful in situations when a remote modem printer application is losing characters S14 0 Reserved S15 0 Bit mapped register setup To set the register se...

Page 69: ... S17 0 Reserved S18 0 Test timer for T loopback testing Sets the time in seconds of testing before the modem automatically times out and terminates the test When set to 0 the timer is disabled Valid range is 1 255 S19 0 Sets the duration in minutes for the inactivity timer The timer activates when there is no data activity on the phone line at time out the modem hangs up S19 0 disables the timer S...

Page 70: ...rs will want to use the default This register is useful for setting compatibility with older systems running under older operating software S26 0 Reserved S27 0 Bit mapped register setup To set the register see instructions for S13 Bit Value Result 0 1 Enables ITU T V 21 modulation at 300 bps for UK calls 1 2 Enables unencoded non trellis coded modulation in V 32 mode 2 4 Disables V 32 modulation ...

Page 71: ...ay not accept 7200 12 000 and 14 400 bps or greater result codes S28 0 Eliminates the V 32 answer tones for a faster connection 8 Default item all times are in tenths of seconds 255 Disables all connections except V 32 at 9600 bps S29 20 Sets the duration in tenths of a second of the V 21 answer mode fallback timer S30 0 Reserved S31 128 Reserved S32 2 Bit mapped register setup To set the register...

Page 72: ...p To set the register see the instructions for S13 Bit Value Result 0 1 Disable 2400 symbol rate 1 2 Disable 2743 symbol rate 2 4 Disable 2800 symbol rate 3 8 Disable 3000 symbol rate 4 16 Disable 3200 symbol rate 5 32 Disable 3429 symbol rate 6 64 Reserved 7 128 Disable shaping S34 0 Bit mapped register setup To set registers see instructions for S13 Bit Value Result 0 1 Disable 8S 2D trellis enc...

Page 73: ...d 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 i...

Page 74: ...ion Then the modem waits for a specified time before OK appears on screen The pause is set in 10 millisecond intervals n is the number of 10 millisecond intervals that pass before OK appears n 0 255 FRS n Makes the modem wait for a specified length of silence before sending OK to the screen The pause is set in10 millisecond intervals n is the number of 10 millisecond intervals that pass before OK ...

Page 75: ... the end of this section for an explanation of messages that appear in response to this command 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 protoc...

Page 76: ...ipt of a network altering ring 3 NO CARRIER No carrier is being received from the modem 4 ERROR The previous command line has not been recognized or was completed abnormally 5 NO DIAL TONE Optional Dial tone was not received within the time out period 6 BUSY Optional A busy signal was detected 64 CONNECT FAX Optional The modem has established a fax connection This response is used only when the fa...

Page 77: ...transmitted between the devices over a shielded serial cable with a 25 pin male DB 25 connector to the modem and a 25 pin 9 pin 8 pin or custom built connector to the computer The use of a shielded cable when connecting a modem to a computer is recommended to ensure minimal interference with radio and television Pin assignments are factory set in the U S Robotics modem to match the standard DB 25 ...

Page 78: ...AA Chassis Ground Both 2 3 BA Transmitted Data Computer 3 2 BB Received Data Modem 4 7 CA Request to Send Computer 5 8 CB Clear to Send Modem 6 6 CC Data Set Ready Modem 7 5 AB Signal Ground Both 8 1 CF Carrier Detect Modem 12 SCF Speed Indicate Modem 20 4 CD Data Terminal Ready Computer 22 9 CE Ring Indicate Modem ...

Page 79: ... 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 73 23 EEC EN 60950 A4 3 97 EN 41003 08 93 The ports on this modem have the following safety status Telephone line connector TNV 2 All other ports SELV These definitions are classified as per safety standard EN 60950 A4 3 97 SELV Safety Extra L...

Page 80: ...his equipment has been approved to CTR 21 for pan European single terminal connection to the Public Switched Telephone Network PSTN However due to differences between the individual PSTNs provided in different countries the approval does not of itself give an unconditional assurance of successful operation on every PSTN network termination point In the event of problems you should contact your equ...

Page 81: ...s that the software programs licensed from it will perform in substantial conformance to the program specifications therefor for a period of ninety 90 days from the date of purchase from 3Com or its authorized reseller 3Com warrants the media containing software against failure during the warranty period No updates are provided 3Com s sole obligation with respect to this express warranty shall be ...

Page 82: ...eeting this standard A product is considered a Heritage 3Com product if it is a member of a product family which was manufactured by 3Com prior to its merger with US Robotics Corporation This Year 2000 limited warranty does not apply to Heritage US Robotics Corporation products If it appears that any such product does not perform properly with regard to such date data on and after January 1 2000 a...

Page 83: ... thirty 30 days after the date of purchase and this is verified by 3Com it will be considered dead or defective on arrival DOA and a replacement shall be provided by advance replacement The replacement product will normally be shipped not later than three 3 business days after 3Com s verification of the DOA product but may be delayed due to export or import procedures When an advance replacement i...

Page 84: ...PAIR OR MODIFY OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE OR BY ACCIDENT FIRE LIGHTNING OR OTHER HAZARD LIMITATION OF LIABILITY TO THE FULL EXTENT ALLOWED BY LAW 3COM ALSO EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY LIABILITY WHETHER BASED IN CONTRACT OR TORT INCLUDING NEGLIGENCE FOR INCIDENTAL CONSEQUENTIAL INDIRECT SPECIAL OR PUNITIVE DAMAGES OF ANY KIND OR FOR LOSS OF REVENUE OR PROF...

Page 85: ...n their entirety they will be limited to the duration of the applicable written warranty This warranty gives you specific legal rights which may vary depending on local law GOVERNING LAW This Limited Warranty shall be governed by the laws of the State of California U S A excluding its conflicts of laws principles and excluding the United Nations Convention on Contracts for the International Sale o...

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