3Com DIGITAL MODEM, User Manual

Page 1: ... 3COMâ IMPACTä ISDN EXTERNAL DIGITAL MODEM USER GUIDE A member of the 3Com Impact product family Part No 09 0699 002 Published August 1995 ...

Page 2: ... C F R 52 227 19 and the limitations set forth in 3Com Corporation s standard commercial agreement for the software Unpublished rights reserved under the copyright laws of the United States The software described in this documentation is furnished under a license agreement included with the product either as a separate document or on the software distribution diskette in a root directory file name...

Page 3: ...equirements 1 8 Apple Macintosh Requirements 1 8 Cabling Requirements 1 9 2 INSTALLING AND CONFIGURING THE DIGITAL MODEM Installing the 3Com Impact Digital Modem 2 3 Installing the Digital Modem in an IBM compatible PC 2 3 Installing the Digital Modem in an Apple Macintosh Computer 2 4 Configuring the 3Com Impact Digital Modem 2 6 Configuration for IBM PC or Compatible Computer 2 7 Configuration f...

Page 4: ...MMANDS REGISTERS AND RESULT CODES AT Command Set for the 3Com Impact Digital Modem B 1 AT Command Set for Internal Analog Fax Modem B 4 Remote S Registers B 7 Digital Modem Result Codes B 10 C TECHNICAL SUPPORT On line Technical Services C 1 3Com Bulletin Board Service C 1 World Wide Web Site C 2 Ask3Com on CompuServe C 2 3ComFacts Automated Fax Service C 2 Support from Your Network Supplier C 3 S...

Page 5: ...FIGURES 1 1 Analog and Digital Network Access with the 3Com Impact Digital Modem 1 2 2 1 Back Panel Power Switch and Connectors 2 1 2 2 Front Panel LED Indicators 2 1 2 3 Configuration Dialog Box 2 8 ...

Page 6: ...nformation by Switch Type 1 7 1 2 Pin Descriptions 1 9 2 1 Front Panel LED Indicator Definitions 2 2 B 1 AT Command Set Summary B 1 B 2 AT Command Set Summary for the Internal Analog Modem B 4 B 3 Remote S Registers B 7 B 4 3Com Impact Digital Modem Result Codes B 10 ...

Page 7: ...on the applicable software utility diskette for the latest product information How to Use This Guide The following table shows where to find specific information in this guide If you are looking for Turn to General information about the 3Com Impact digital modem Chapter 1 Instructions for installing and operating the digital modem Chapter 2 Simple digital modem troubleshooting tips Chapter 3 Instr...

Page 8: ...ferred to in the text they are called out by their labels such as the Return key or the Escape key or they may be shown as Return or Esc If two or more keys are to be pressed simultaneously the keys are linked with a plus sign for example Press Ctrl Alt Del Italics Italics are used to denote new terms or emphasis Table 2 Notice Icons Icon Type Description Information Note Information notes call at...

Page 9: ...rer channels for user data and one 16 Kbps signaling D Data channel used for packet communications with the public network and providing status and control information In most regions the ISDN BRI is priced at 1 5 to 1 8 times the monthly cost of an analog POTS plain old telephone service telephone line You may dial voice or data connections on either or both of the B channels simultaneously Calls...

Page 10: ... Figure 1 1 Analog and Digital Network Access with the 3Com Impact Digital Modem Four models of the 3Com Impact digital modem are sold in the U S and Canada 3C871 is the IBMâ or IBM compatible PC external digital modem product 3C872 is the IBM or IBM compatible PC external digital modem product with an internal 14 4 Kbps analog fax modem 3C876 is the Appleâ Macintoshâ external digital modem produc...

Page 11: ...tocols like Point to Point Protocol PPP and V 120 V 120 is a rate adaption scheme to convert transmission rates from a range of 50 bps to 19 2 Kbps to the B channel 64 Kbps rate Multilink PPP support which allows the two B channels to be virtually linked thereby allowing a maximum digital connection of 128 Kbps Dynamic bandwidth allocation DBA which allows you to place a voice call while a Multili...

Page 12: ...seconds This high speed performance allows you to do the following Dial up the Internet at high data rates Access your office s LAN Access and download graphics software and data files more quickly Voice Capabilities The 3Com Impact digital modem s Phone Out port allows the use of existing analog telephone equipment touch tone telephones cordless telephones and fax and answering machines to place ...

Page 13: ... in V 32bis analog fax modem Standard Package Contents The following list describes the package contents common to models 3C871 3C872 3C876 and 3C877 Refer to the section Additional Contents for any additional items that are specific to a particular model One 3Com Impact ISDN digital modem One power cable with an ac wall transformer One serial cable One RJ 45 RJ 11 ISDN telephone cable One 3 5 ins...

Page 14: ...DN digital line use the following simplified ISDN ordering code 3ComA J6 If your digital modem has an internal analog fax modem Models 3C872 and 3C877 then two directory numbers telephone numbers will be required to allow a voice call and a fax modem call to occur at the same time When you tell the telephone company the ISDN ordering code 3ComA J6 let the representative know that you will need two...

Page 15: ... Switch Type ISDN Switch Type ISDN Line Configuration Parameter AT Tâ 5ESS Custom AT T 5ESS National ISDN 1 Northern Telecomâ DMS100 National ISDN 1 Siemensâ EWSD National ISDN 1 Line Code 2B1Q no NT1 required 2B1Q no NT1 required 2B1Q no NT1 required 2B1Q no NT1 required Directory Numbers 1 1 2 1 Channels 2B alternate circuit switched data and voice 2B alternate circuit switched data and voice 2B...

Page 16: ...rboComä driver for Windows which replaces the standard Microsoft Windows COM driver is included with the 3Com Impact digital modem MS DOSâ or IBM PC DOS 3 1 or later operating system 640 Kilobytes of conventional memory Microsoft Windows 3 1 or later optional A hard disk drive with 1 MB of free space Apple Macintosh Requirements An Apple Macintosh computer must be a Macintosh Plus or later model I...

Page 17: ...le connector The digital modem asynchronous port pin assignments shown in Table 1 2 conform to standard definitions for data communications equipment DCE Table 1 2 Pin Descriptions Pin Pin Name Signal Direction 1 Carrier Detect DCD From digital modem 2 Receive Data RD From digital modem 3 Transmit Data TD To digital modem 4 Data Terminal Ready DTR To digital modem 5 Signal Ground GND 6 Data Set Re...

Page 18: ...gure 2 1 and Figure 2 2 showing the digital modem back and front panels during installation and configuration If you encounter difficulties after installation refer to Chapter 3 Troubleshooting Figure 2 1 Back Panel Power Switch and Connectors The LED status display shown in Figure 2 2 consists of five front panel LEDs that are described in Table 2 1 Figure 2 2 Front Panel LED Indicators Power 12V...

Page 19: ...s synchronization and the ISDN D channel signaling procedures are not properly established the LED flashes Once the physical and D channel signaling are synchronized the LED goes off If any physical loss of framing occurs the LED lights if there is a loss of D channel signaling the LED flashes B 1 Yellow or green B 1 Channel Indicator Indicates the activity state of the B 1 channel of the ISDN int...

Page 20: ...rt the 9 pin male end of the 3Com Impact digital modem to PC serial signal cable into the connector labeled Computer on the digital modem s back panel and tighten the connector screws 4 Connect the other end of the 3Com Impact digital modem to PC serial signal cable to a serial communications COM port on the back of your PC and tighten the connector screws Most COM port connectors are labeled COM ...

Page 21: ...rd analog telephone jack or to an external NT1 device Make sure that it is connected to the ISDN jack 9 Turn on the 3Com Impact digital modem by toggling the power switch on the back panel to the On position See Figure 2 1 for the location of the power switch on the digital modem s back panel The indicator LEDs on the front panel see Figure 2 2 flash momentarily as the unit undergoes a power up se...

Page 22: ...dem See Figure 2 1 for the location of the 12V AC connector on the digital modem s back panel 6 Plug the transformer end of the power cable into a standard 117V ac wall outlet 7 Connect the RJ 45 8 pin connector end of the RJ 45 RJ 11 ISDN cable to the RJ 45 connector labeled Wall on the digital modem s back panel See Figure 2 1 for the location of the RJ 45 connector on the digital modem s back p...

Page 23: ...elow before it can operate properly on an ISDN line Before configuring the digital modem make sure you have this information readily available These five parameters are provided to you at the time of installation of your ISDN line by the telephone company installer ISDN Switch Type Phone 1 local directory telephone number SPID 1 Service Profile Identifier Phone 2 if required by the telephone compa...

Page 24: ...computer using Windows 1 Insert the 3Com Impact DOS Windows Installation Diagnostic Utilities diskette into an available diskette drive 2 Select Run from the File menu In the Run dialog box type a setup The check box labeled Run Minimized should be left unchecked 3 Click OK The installation process begins copying the configuration program to the hard disk A message box provides the status of the i...

Page 25: ...dpoint Identifiers TEI 1 and 2 for information purposes only A message bar at the bottom of the dialog box provides help for completing the fields If you click in a field the message bar tells you what information to enter in the field The message bar also provides status information about the digital modem If the digital modem is disconnected from the ISDN telephone line for example a message ind...

Page 26: ... Point do not include the SPID 8 Specify which device should receive the calls coming to Telephone Number 1 You can select Phone Port or Internal Fax Modem If your model has the internal analog fax modem installed Models 3C872 and 3C877 you can select both If both boxes are checked the internal analog fax modem and the phone will both ring enabling you to answer using either device 9 If you have a...

Page 27: ... number is provided by the telephone company for informational purposes only Layer 1 UP SPID 1 Init TEI 1 Number from 0 to 127 SPID 2 Init if required TEI 2 Number from 0 to 127 if required 14 Click Exit to leave the utility This completes the configuration procedure 15 Install the TurboCom software Refer to the installation instructions that came with the TurboCom software After the TurboCom soft...

Page 28: ...ce Bar to select the digital modem s COM port and COM port data rate This sets the speed of communication between the 3Com Impact digital modem and the computer during configuration When you select the port the standard interrupt IRQ associated with that port is automatically chosen Select the COM port data rate based on the data rate required by the destination digital modem and the maximum data ...

Page 29: ...t both The Phone Port and Internal Fax Modem check boxes associated with Phone 1 appear to the right of Phone 1 If both boxes are checked the internal analog fax modem and the phone will both ring enabling you to answer using either device 8 If you have a second telephone number associated with your ISDN telephone line some telephone companies require two enter the number and corresponding SPID in...

Page 30: ...pple Macintosh computer 1 Insert the 3Com Impact Installer Diagnostic Utilities software utility diskette into the diskette drive and copy the files by selecting them and dragging them to the hard drive icon The Macintosh operating system automatically places the files in the appropriate folders 2 Open the 3Com Impact Mac folder and double click the 3Com Impact Installer program icon to launch it ...

Page 31: ...e number associated with your ISDN telephone line some telephone companies require two enter the number and corresponding SPID in the Phone Number 2 and SPID Number 2 fields 7 Specify which device should receive the calls coming to Phone Number 2 8 Confirm that the parameters listed in steps 3 through 7 are correct 9 Click the Update Configuration button to update this information to the 3Com Impa...

Page 32: ...ister S60 56 Kbps default or 64 Kbps B channel transmission speeds are used Correct examples of outgoing circuit switched digital modem commands with dial strings are AT D 1 908 555 7891 ATD19085555555 Multilink PPP Calls With Dynamic Bandwidth Allocation The 3Com Impact digital modem supports Multilink PPP which allows the two B channels to be virtually linked thereby allowing a maximum digital c...

Page 33: ...er Class value Valid classes are listed in Appendix B AT Commands Registers and Result Codes Register S83 stores the actual Multilink Endpoint Identifier Note that this option is not required in most cases so these registers typically do not have to be changed If the Multilink Endpoint Identifier is required these values will be provided by your system administrator or Internet service provider Wh...

Page 34: ...ms or from ISDN devices and Sw56 equipment may be received by the digital modem If auto answer is disabled the default in register S0 a RING message is delivered to the Computer port upon reception of an incoming data call to the digital modem The command AT A answers the incoming data call A CONNECT message is then delivered to the Computer port upon successful connection If auto answer is enable...

Page 35: ...one Out port These devices do not conform to the loop current power specification of the 2500 touch tone telephone standard and their operation is not guaranteed Placing Calls Using the Phone Out Port To place an outgoing call simply take the telephone handset or external fax machine off the hook wait for a dial tone and dial the destination telephone number Receiving Calls Using the Phone Out Por...

Page 36: ... Basic Rate BRI Primary Rate PRI or T1 access lines A wide variety of software and internetworking products has been tested for interoperability with the 3Com Impact digital modem s Async Sync PPPä conversion software QuickSelect The 3Com Impact digital modem supports V 120 and Async Sync PPP conversion The digital modem uses a technique called QuickSelectä so that you do not have to manually sele...

Page 37: ...n for assistance check the following 1 The power supply is connected and the power LED is on 2 Turn the 3Com Impact digital modem power switch off and then on again several times and observe the Test LED During power up self test the Test LED flashes If the Test LED flashes and remains on for more than a few minutes there is an internal failure Notify your reseller that the 3Com Impact digital mod...

Page 38: ...t then begins to flash When the D channel LED flashes it indicates that the ISDN signal is present When the D channel LED goes out it indicates that a valid communication channel has been established and calls may be attempted by the user If the D channel LED remains lit after more than a few minutes it is likely that there is a poor physical connection to the local telephone company This fault ca...

Page 39: ... receive calls If you have a standard analog telephone attached to the digital modem s analog voice port you can place a voice call in the normal fashion You should have the ability to obtain a dial tone enter digits and connect to your destination While the voice call is being placed either the B 1 or B 2 channel LEDs will flash yellow Once the voice call is connected and the other party picks up...

Page 40: ...oll data connections contact your local telephone company and have it verify that you can dial a data call to the destination telephone number 7 If you are able to establish a data call in which the B 1 or B 2 green LED remains lit and you receive a CONNECT message at your application software but you are unable to send data then it is possible that There is a difference in the local and remote B ...

Page 41: ...ution your digital modem has been uniquely designed to be user upgradable As recommended by 3Com technical support you may need to download the latest firmware to your digital modem You can use the following procedure to download the updated firmware to your digital modem For IBM and IBM Compatible PCs This section provides instructions on downloading firmware from your PC to your digital modem 1 ...

Page 42: ... your digital modem 1 Obtain the latest firmware file from the 3Com FTP site ftp 3Com com 2 Copy the firmware file to your computer 3 Double click the 3Com Impact icon to access the Utility dialog box Use the Diagnostics button only under the direction of service personnel 4 Click the Update Firmware button 5 Select the firmware file that you copied from 3Com s FTP site and click OK to start the d...

Page 43: ...s software or server use the Hayes default initialization string Software that communicates using AT commands ATtention codes is required to control the 3Com Impact digital modem You can enter these codes manually However they are often entered automatically by modem communications software For a summary of the AT command set see Appendix B AT Commands Registers and Result Codes Below is a sample ...

Page 44: ...mmands When your computer is powered on the digital modem automatically starts in command mode If you have recently used the digital modem to make a call and have not yet disconnected type to switch to command mode 3 Type AT commands Enter An AT command line starts with the characters AT The command line can accept up to 40 command characters in the line not including the two AT characters spaces ...

Page 45: ...nswers an incoming call C Serial port CD control AT C2 C0 forces CD to remain on at all times C1 forces CD to follow the state of carrier from the remote system CD turns on after CONNECT message is sent to host default C2 forces CD to remain on except temporarily after disconnect D ATD5551234 Dials an outgoing 56 64 Kbps circuit switched digital connection DT ATDT5551234 Dials an outgoing analog m...

Page 46: ... memory checksum I4 displays the modem product code precomputed checksum firmware revision number model interface type country code and data pump model O Enter connect state AT O Causes the digital modem to go out of command mode into on line mode Q Result code control AT Q0 Q0 enables the output of result codes default Q1 disables the output of result codes Q2 disables the output of result codes ...

Page 47: ... V1 enables long form result codes default W Stores configuration AT W Stores the configuration of all S registers that are not part of the digital modem initial configuration set Z Reset AT Z Disconnects all calls in progress and performs a complete digital modem system reset Enter command state Causes digital modem to enter the command state if it is currently in the on line state B Set baud rat...

Page 48: ...at 1200 bps 0 V 22 1 Bell 212a default C1 ATC1 Modem responds with OK F Select modem modulation mode 0 Auto detect default 1 V 21 Bell 103 3 V 23 4 V 22 Bell 212a 5 V 22bis 6 V 32bis V 32 4800 bps 7 V 32bis V 32 7200 bps 8 V 32bis V 32 9600 bps 9 V 32bis 12000 bps 10 V 32bis 14400 bps L Modem speaker volume control 0 1 Low 2 Medium default 3 High M Modem speaker operation 0 Off 1 On during handsha...

Page 49: ... quality becomes insufficient L Return received line signal level Returns a value that indicates the received line signal level Q Report line signal quality Reports the line signal quality G Generate guard tone 0 Disable default 1 Select 1800 Hz guard tone V Display current configuration A Set MNP max block size 0 64 1 128 2 192 3 256 B Transmit break to remote Sends break to remote modem with a l...

Page 50: ...e inhibits MNP extended services initiation during V 42 LAPM answer mode detection phase Q MNP 10 fallback to 2400 bps V 22bis 1200 V 22 Enables or disables fallback from MNP 10 to V 22bis V 22 0 Disable 1 Enable default H Link negotiation speed Controls the connection speed for link negotiations before upshift occurs between two MNP Class 10 modems 0 Highest rate default 1 1200 bps 2 4800 bps F A...

Page 51: ...f required by your carrier S55 Terminal Endpoint Identifier 1 Stores the first TEI assigned by the switch if a second directory number is required by your carrier A value of 255 indicates no TEI has been assigned This field is read only S56 Terminal Endpoint Identifier 2 Stores the second TEI assigned by the switch A value of 255 indicates no TEI has been assigned This field is read only S57 Termi...

Page 52: ...ith the switch 1 U interface is synchronized and ready S60 B Channel Data Rate 56 56 Kbps default 64 64 Kbps S61 Outgoing Call Type 0 Follow dial modifiers default 2 ISDN 3 Internal analog fax modem S63 only for models with an internal fax modem Incoming Voice Call Routing bit map Bit Position Feature 0 Phone 1 internal analog fax modem 1 Phone 1 Phone Out port 2 Phone 2 internal analog fax modem ...

Page 53: ... dialing a Multilink PPP call requires two separate directory numbers you must include the second telephone number of up to 15 digits in this S register If left blank then the number used to dial the first link is used S82 Multilink PPP Endpoint Identifier Class If required this information is provided by your Internet service provider 1 Locally Assigned Address 2 Internet Protocol IP Address 3 IE...

Page 54: ...terface is not operational 4 ERROR Indicates that the most recent command or action was not successfully completed 7 BUSY Indicates that the most recent call attempt did not connect because the remote destination was busy 5 CONNECT 1200 Indicates 1200 bps analog modem connection 10 CONNECT 2400 Indicates 2400 bps analog modem connection 11 CONNECT 4800 Indicates 4800 bps analog modem connection 12...

Page 55: ...cles This service is available via modem seven days a week 24 hours a day To reach the service set your modem to 8 data no parity and 1 stop bit Country Baud Rate Telephone Number Australia up to 14400 baud 61 2 955 2073 France up to 14400 baud 33 1 69 86 69 54 Germany up to 9600 baud up to 9600 baud 49 89 627 32 188 49 89 627 32 189 Hong Kong up to 14400 baud 852 537 5601 Italy fee required up to...

Page 56: ... well as an interactive forum for technical questions To use Ask3Com you need a CompuServe account To use Ask3Com 1 Log on to CompuServe 2 Enter go threecom 3 Press Return to see the Ask3Com main menu 3ComFacts Automated Fax Service 3Com Corporation s interactive fax service 3ComFacts provides data sheets technical articles diagrams and troubleshooting instructions on 3Com products 24 hours a day ...

Page 57: ... variety of services including network planning installation hardware maintenance application training and support services When you contact your network supplier for assistance have the following information ready Diagnostic error messages A list of system hardware and software including revision levels Details about recent configuration changes if applicable If you are unable to contact your net...

Page 58: ...800 876 3266 for customer service Returning Products for Repair A product sent directly to 3Com for repair must first be assigned a Return Materials Authorization RMA number A product sent to 3Com without an RMA number will be returned to the sender unopened at the sender s expense To obtain an RMA number call or fax Country Telephone Number Fax Number U S and Canada 800 876 3266 408 764 7120 ...

Page 59: ...ranty period No updates are provided 3Com s sole obligation hereunder shall be at 3Com s discretion to refund the purchase price paid by Customer for any defective software products or to replace any defective media with software which substantially conforms to 3Com s applicable published specifications Customer assumes responsibility for the selection of the appropriate applications program and a...

Page 60: ... ATTEMPTS TO REPAIR OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE OR BY ACCIDENT FIRE LIGHTNING OR OTHER HAZARD LIMITATION OF LIABILITY IN NO EVENT WHETHER BASED IN CONTRACT OR TORT INCLUDING NEGLIGENCE SHALL 3COM BE LIABLE FOR INCIDENTAL CONSEQUENTIAL INDIRECT SPECIAL OR PUNITIVE DAMAGES OF ANY KIND OR FOR LOSS OF REVENUE LOSS OF BUSINESS OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CON...

Page 61: ...guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipme...

Page 62: ...e customer should be aware that compliance with the above conditions may not prevent degradation of service in some situations Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier Any repairs or alterations made by the user to this equipment or equipment malfunctions may give the telecommunications company cause to request the user...