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3Com DIGITAL MODEM Network Card User Manual

1. Conventions Table 1 and Table 2 list text and icon conventions that are used throughout this guide Table 1 Text Conventions Convention Description Text represented as screen display This typeface is used to represent displays that appear on your terminal screen for example NetLogin Text represented as commands This typeface is used to represent commands that you enter for example SETDefault 0 IP NETaddr 0 0 0 0 Keys When specific keys are referred 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 Table 2 Notice Icons Icon Type Italics are used to denote new terms or emphasis Description gt A rN Information Note Information notes call attention to important features Caution Warning or instructions Cautions contain directions that you must follow to avoid immediate system damage or loss of data Warnings contain directions that you must follow for your personal safety Follow all instructions carefully 1 INTRODUCTION e te The Integrated Services Digital Network ISDN is a digital communications standard for supporting voice data and video applications through conventional telephon
2. 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 SERIAL or RS 232 C On an IBM AT PC and most laptops or notebooks connect the cable to a 9 pin COM port connector 5 Connect the 3Com Impact digital modem power cable to the connector marked 12V AC on the back panel of the digital modem 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 2 4 CHAPTER 2 INSTALLING AND CONFIGURING THE DIGITAL MODEM 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 panel 8 Connect the RJ 11 6 pin connector end of the RJ 45 RJ 11 ISDN cable to the RJ 11 ISDN wall jack A CAUTION The 3Com Impact digital modem is designed to operate with Basic Rate ISDN 2B1Q U Interface network terminations An internal Network Termination device NT1 is built into the digital modem Do not connect the 3Com Impact digital modem ISDN port to a standard 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
3. R LOSS OF REVE N CONNECTIO f implied M G E Y OTH ITS PRO F ITS 1 DOES NOT EXIST OR WAS CAUSED BY PROPER INSTALLATION OR TESTING AUSE BEYOND THE RANGE OF THE R HAZARD IN CONTRACT OR TORT INCLUDING NCIDENTAL CONSEQUENTIAL INDIRECT SPECIAL OR UE LOSS OF BUSINESS OR OTHER WITH THE SALE INSTALLATION LURE OR INTERRUPTION OF ITS PRODUCTS EVEN IF ADVISED OF THE POSSIBILITY OF SUCH RATE AS WARRANTED LUDING WARRANT ER LIABILITY IN CON DUCTS TESTING AND EXAMI ABOVE R REFUND OF THE PURCHASE RANTIES AND REMEDIES ARE EXCLUSIVE SS OR IMPLIED EITHER IN FACT OR BY ISE INC URPOSE 3 IES OF COM NEITHER ASSUMES NOR ECTION ATION warranties or the limitation of incidental or he above limitations and exclusions may not fic legal rights which may vary from state to state hall be governed by the laws of the state of California FCC CLASS B CERTIFICATION STATEMENT 3Com Corporation Model Nos 3C871 3C872 3C876 3C877 FCC ID LP2QAREMOTE Made in U S A This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation WARNING This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules and th
4. current calls upon on off transition of DTR and prepares serial port to accept AT command at any speed default EO disables the echo of AT commands back to the host computer E1 enables the echo of AT commands to the host computer default Restores all factory default settings Hangs up the current connections 0 displays the product and options ID 1 displays the flash memory checksum 4 displays the modem product code precomputed checksum firmware revision number model interface type country code and data pump model Causes the digital modem to go out of command mode into on line mode QO enables the output of result codes default Q1 disables the output of result codes Q2 disables the output of result codes in answer mode only Q0 disables flow control Q1 enables bidirectional XON XOFF software flow control Q3 enables bidirectional RTS CTS hardware flow control default Provides an output list of all S registers Reads a specific S register setting Writes to a specific S register continued AT Command Set for the 3Com Impact Digital Modem B 3 Table B 1 AT Command Set Summary continued Command Function Example Description s T amp W B V Read on line status command settings AT S Link inactivity timer AT T1 Result code format AT VO Stores configuration AT amp W Reset AT Z Enter command state Set baud
5. Figure 2 2 consists of five front panel LEDs that are described in Table 2 1 M 3ComImpact eZ X Figure 2 2 Front Panel LED Indicators CHAPTER 2 INSTALLING AND CONFIGURING THE DIGITAL MODEM Table 2 1 Front Panel LED Indicator Definitions LED Color Description Power Test D Channel B 2 Yellow Yellow Yellow Yellow or green Yellow or green Power Indicator Lit when power is on and remains lit as long as power is available from the ac wall transformer plugged into the electrical outlet Self Test Status Flashes when the digital modem is executing its power up self test or a user initiated reset If the results of the self test or reset are normal the LED goes off If the result of the self test is abnormal and a fault is detected the LED remains lit but does not flash D Channel Status Provides a quick indication of the ISDN physical network interface and D channel status If the physical ISDN interface is not synchronized or is disconnected this LED remains lit If the physical interface establishes 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 Channel Indicator Indicates the activity state of the B 1 channel of
6. or modifications not expressly approved by 3Com could void the user s authority to operate this equipment Refer to the manual for specifications on cabling types CANADIAN NOTICE The Industry Canada label identifies certified equipment This certification means that the equipment meets certain telecommunications network protective operation and safety requirements The Department does not guarantee the equipment will operate to the users satisfaction Before installing this equipment users should ensure that is permissible to be connected to the facilities of the local telecommunications company The equipment must also be installed using an acceptable method of connection In some cases the inside wiring associated with a single line individual service may be extended by means of a certified connector assembly The 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 to disconnect the equipment Users should ensure for their own protection that the electrical ground connections of the power utility telephone lines and internal metallic water pipe system if present are connected toget
7. 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 associated reference materials 3Com makes no warranty that its software products will work in combination with any hardware or applications software products provided by third parties that the operation of the software products will be uninterrupted or error free or that all defects in the software products will be corrected For any third party products listed in the 3Com software product documentation or specifications as being compatible 3Com will make reasonable efforts to provide compatibility except where the non compatibility is caused by a bug or defect in the third party s product STANDARD WARRANTY SERVICE Standard warranty service for hardware products may be obtained by delivering the defective product accompanied by a copy of the dated proof of purchase to 3Com s Corporate Service Center or to an Authorized 3Com Service Center during the applicable warranty period Standard warranty service for software products may be obtained by telephoning 3Com s Corporate Service Center or an Authorized 3Com Service Center within the warranty period Products returned to 3Com s Corporate Service Center must be pre authorized by 3Com with a Return Material Authorization RMA
8. rate AT B57600 Show version number AT V Reads the status of any parameters that have been modified through AT commands TO disables inactivity timer default Tn link inactivity timer in minutes The digital modem automatically disconnects the call if no activity is sensed within n n 0 255 minutes VO enables short form result codes V1 enables long form result codes default Stores the configuration of all S registers that are not part of the digital modem initial configuration set Disconnects all calls in progress and performs a complete digital modem system reset Causes digital modem to enter the command state if it is currently in the on line state 0 Autobaud default Other settings are 1200 2400 4800 9600 19200 38400 57600 and 115200 Displays digital modem firmware version B 4 APPENDIX B AT COMMANDS REGISTERS AND RESULT CODES AT Command Set for Internal Analog Fax Modem Table B 1 summarizes the AT command set for the internal analog modem Table B 2 AT Command Set Summary for the Internal Analog Modem Command Function Example Description B C1 Set 1200 bps operation 0 ATC1 Select modem modulation mode Modem speaker volume control Modem speaker operation Initiates calls using either ITU T V 220 or Bell 212a at 1200 bps 0 V 22 1 Bell 212a default Modem responds with OK 0 Auto detect default 1 V 21 Bell
9. serial communications port For sustained performance at higher data rates 57 6 Kbps and 115 2 Kbps it is recommended that your IBM or IBM compatible PC serial COM port be equipped with a 16C550 UART universal asynchronous receiver transmitter To determine what UART is installed in your PC run the Microsoft Diagnostic Program msd from the DOS prompt In addition for reliable high speed serial port performance in the Microsoft Windows environment a TurboCom driver for Windows which replaces the standard Microsoft Windows COM driver is included with the 3Com Impact digital modem MS DOS 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 gt An Apple Macintosh computer must be a Macintosh Plus or later model It must also have the following An available serial communications port The highest possible serial port data rate with most Macintosh computers is 57 6 Kbps Some later Macintosh models AV and Power Macintosh have data rates of up to 115 2 Kops 3Com recommends that you use the 8 pin serial communications port on your Macintosh System 7 or later operating system A hard disk drive with 1 MB of free space Cabling Requirements Cabling Requirements Cables to connect the 3Com Impact digital modem to your computer are provided For IBM or IBM comp
10. service 6 Monitor the B 1 and B 2 LEDs Data calls typically involve more interactions than voice calls do Your computer applications software or the remote destination can prevent establishment of a data call If you have been able to perform all of the above steps your 3Com Impact digital modem is most likely functioning correctly 3 4 CHAPTER 3 TROUBLESHOOTING If you are unable to establish a data call carefully monitor the B 1 and B 2 LEDs while attempting a data call The B 1 and B 2 LEDs flash green during the data call establishment phase They then remain continuously green once the data connection is established If neither of the B 1 or B 2 LEDs flashes green check to make sure that your computer is turned on and operational that your 3Com Impact digital modem cable is properly connected and not damaged and that your application software has sent an AT dial command in the proper format Depending upon the location of the destination call you are dialing there may be an incompatible local or toll telephone company Though this is less likely if you suspect a telephone company problem in dialing local or toll data connections contact your local telephone company and have it verify that you can dial a data call to the destination telephone number 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
11. the 3Com Impact digital modem A message box appears and allows you to confirm the download The download will take several minutes Click OK AT COMMAND SET OVERVIEW e e Most communications software supports an AT command ine initialization string The initialization string sets up the 3Com Impact digital modem to negotiate and connect with a remote modem Before dialing the software sends the initialization string to the 3Com Impact digital modem The communications software or server stores the initialization string and uses it each time it dials In most situations an initialization string is not necessary with the 3Com Impact digital modem If an initialization string is required by the communications 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 AT command line AT V1 D 1 800 555 3333 Enter AT gets the attention of your 3Com Impact digital modem V1 sets the digital modem to verbose mode so that it sends its responses in English words instead of numbers D tells the digital modem to dial an ISDN digital connection to the phone number that fol
12. to send data then it is possible that a There is a difference in the local and remote B channel data rates a There is a mismatch in the data communications protocols a There is an interoperability mismatch between the local and remote applications a Make sure that the local and remote data applications have communication capability and are properly configured Once you have verified that communication capability exists make sure that the B channel call data rate is the same as the remote destination call data rate The default B channel data rate used by the digital modem is 56 Kbps Under some circumstances the data rate may be increased to 64 Kbps at both ends of the connection 8 Downloading Firmware to Your External Digital Modem 3 5 If problems persist refer to Appendix C Technical Support If you have gone through the troubleshooting tips and still have not been able to resolve the problem contact technical support Please have the serial number of your 3Com Impact digital modem a list of symptoms including any LED status information computer display status and relevant information about your application software ready when you call Downloading Firmware to Your External Digital Modem Data communications is an evolving technology To keep pace with this evolution your digital modem has been uniquely designed to be user upgradable As recommended by 3Com technical support you may need to down
13. 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 self test diagnostic 10 Turn on the computer s power switch 11 Go to the section Configuration for IBM PC or Compatible Computer later in this chapter to configure the 3Com Impact digital modem Installing the Digital Modem in an Apple Macintosh Computer To install the 3Com Impact digital modem model 3C875 or 3C877 in an Apple Macintosh computer 1 Turn off the computer 2 Ensure that the 3Com Impact digital modem power switch is in the Off position Installing the 3Com Impact Digital Modem 2 5 Insert the 9 pin male end of the 3Com Impact digital modem to Macintosh serial signal cable into the connector labeled Computer on the digital modem s back panel and tighten the connector screws Connect the other end of the 3Com Impact digital modem to Macintosh serial signal cable to the serial communications port on the back of the Macintosh The serial communications port is the mini DIN 8 pin serial port connector indicated on the Macintosh connector panel by the telephone handset imprint Connect the 3Com Impact digital modem power cable to the connector marked 12V AC on the back panel of the digital modem See Figure 2 1 for the location of the 12V AC conn
14. 0 jiran Ej Froma Fori H miena r aaam Tma m SPD 1 m IBI 1 36 APD iri 1E E 105 Figure 2 3 Configuration Dialog Box A status bar below the Help Tools Configure and Exit buttons provides the following ISDN status information m Layer 1 status m Service Profile Identifier SPID for telephone numbers 1 and 2 m Terminal Endpoint 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 indicates this condition The right side of the dialog box shows the digital modem software version along with any installed options such as Multilink PPP or internal analog fax modem 10 11 Configuring the 3Com Impact Digital Modem 2 9 Select the type of switch as specified by your telephone company from the Telephone Company Switch drop down list box Click in the Telephone Number field in the Number 1 area and enter the telephone number to which your digital modem is connected Click in the Service Profile Identifier SPID field and enter the corresponding SPID for the telephone number you entered in the previous step You should have received this SPID from your telephone com
15. 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 0 1 Low 2 Medium default 3 High 0 Off 1 On during handshaking off while receiving carrier default 2 On during handshaking on while receiving carrier 3 Off while receiving carrier on during answering continued AT Command Set for Internal Analog Fax Modem B 5 Table B 2 AT Command Set Summary for the Internal Analog Modem continued Command Function Example Description X Select the subset of result 0 Basic call progress Bee A A A 1 Basic call progress and connection rate the results of commands 2 Basic call progress and connection rate 3 Basic call progress and connection rate 4 All call progress and connection rate E Line quality monitor control 0 Disable 1 Enable and retrain 2 Enable and fallback forward 3 Enable and auto retrain but hang up immediately if line 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 amp G Generate guard tone 0 Disable default 1 Select 1800 Hz guard tone amp V Display current configuration A Set MNP max block size 0 64 1 128 2 192 3 256 B Transmit bre
16. D channel providing large businesses with a greater degree of flexibility 1 2 CHAPTER 1 INTRODUCTION The 3Com Impact ISDN External Digital Modem referred to as the 3Com Impact digital modem throughout this guide is an external stand alone ISDN Basic Rate digital modem for connection with digital telephone services from local telephone companies in North America It is designed for users who require high speed access to the Internet on line information services or their corporate local area network LAN A typical 3Com Impact digital modem application is shown in Figure 1 1 3Com Impact ISDN External Digital Modem Internet or on line service ISDN line Public telephone network Analog or ISDN line ad Analog or ISDN line Corporate LAN 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 a 3C871 is the IBM or IBM compatible PC external digital modem product a 3C872 is the IBM or IBM compatible PC external digital modem product with an internal 14 4 Kbps analog fax modem 3 876 is the Apple Macintosh external digital modem product 3C877 is the Apple Macintosh external digital modem product with an internal 14 4 Kbps analog fax modem 3Com Impact Digital Modem Features 1 3 The 3Com Impact digital modem can be connected to any compatible UL listed IBM AT compa
17. DN Line AT amp T 5ESS DMS100 EWSD Configuration AT amp T 5ESS National National National Parameter Custom ISDN 1 ISDN 1 ISDN 1 Line Code 2B1Q no NT1 2B1Q no NT1 2B1Q no NT1 2B1Q no NT1 required required required required Directory 1 1 2 1 Numbers Channels 2B alternate 2B alternate 2B alternate 2B alternate Terminal Type TEI Call Appearances Supplemental Voice Features EKTS Features D Channel Packet B Channel Packet circuit switched data and voice circuit switched data and voice circuit switched data and voice circuit switched data and voice A with A with Functional PVC 2 Functional Point to Point Point to Point Dynamic Dynamic Dynamic Dynamic dle dle one one None None o o No No o o No No o o No No Two directory numbers are required for Models 3C872 and 3C877 This allows a voice call and a call using the internal analog fax modem to occur at the same time Computer System Requirements Connect the model 3C871 or 3C872 3Com Impact digital modem to an IBM compatible computer Connect the model 3C876 or 3C877 3Com Impact digital modem to an Apple Macintosh computer Connect the digital modem to a computer that meets UL standards in the United States or is certified to CSA standards in Canada 1 8 CHAPTER 1 INTRODUCTION IBM PC or Compatible Requirements gt An IBM compatible PC must have the following A 386 486 or Pentium processor An available
18. Part No 09 0699 002 Published August 1995 3Com IMPACT ISDN EXTERNAL DIGITAL MODEM USER GUIDE A member of the 3Com Impact product family 3Com Corporation m 5400 Bayfront Plaza m Santa Clara California m 95052 8145 3Com Corporation 1995 All rights reserved No part of this documentation may be reproduced in any form or by any means or used to make any derivative work such as translation transformation or adaptation without permission from 3Com Corporation 3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change 3Com Corporation provides this documentation without warranty of any kind either implied or expressed including but not limited to the implied warranties of merchantability and fitness for a particular purpose 3Com may make improvements or changes in the product s and or the program s described in this documentation at any time UNITED STATES GOVERNMENT LEGENDS If you are a United States government agency then this documentation and the software described herein are provided to you subject to the following restricted rights For units of the Department of Defense Restricted Rights Legend Use duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph c 1 ii for restricted Rights in Te
19. Some Multilink PPP implementations require the use of a Multilink PPP option called the Multilink Endpoint Identifier This option is configured in registers S82 and 83 Register S82 stores the Multilink Endpoint Identifier 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 When dynamic bandwidth allocation is enabled by default you can place a voice call from a device that is attached to the Phone Out port while a Multilink PPP call is active When you lift the telephone handset to place a voice call the digital modem automatically removes one of the Multilink PPP connections and uses it for the voice call Once the voice call ends the digital modem automatically reestablishes that channel for Multilink PPP operation There may be cost implications due to the use of two B channels for Multilink PPP Check with your service providers such as the telephone company Internet access provider or on line service provider Using the Phone Out Port 2 17 Placing Analog Modem Calls To place a call from your PC or Macintosh using the optional V 32bis 14 4 Kbps internal analog fax modem i
20. aboratories Inc Pentium is a trademark of Intel Corporation Microsoft MS DOS and Windows are trademarks of Microsoft Corporation Siemens is a trademark of Siemens Artiengesellschaft Northern Telecom is a trademark of Northern Telecom Limited AT amp T is a trademark of American Telephone amp Telegraph Company Motorola is a trademark of Motorola Inc TurboCom is a trademark of Bio Engineering Research Laboratory AdTran is a trademark of AdTran Inc Delrina WinComm and WinFax are trademarks of Delrina Corporation Other brand and product names may be registered trademarks or trademarks of their respective holders Guide written by Anne Bailey Edited by Nancy Kurahashi Technical illustration by Tim Buckreus Production by Yvonne Sartain CONTENTS ABOUT THIS GUIDE Introduction i How to Use This Guide i Conventions ii INTRODUCTION 3Com Impact Digital Modem Features 1 3 Data Capabilities 1 4 Voice Capabilities 1 4 Simultaneous Data and Voice Capabilities 1 4 Analog Modem Capabilities 1 5 3Com Impact Digital Modem Package Contents 1 5 Standard Package Contents 1 5 Additional Contents 1 5 ISDN Digital Line Configuration Requirements 1 6 Computer System Requirements 1 7 IBM PC or Compatible Requirements 1 8 Apple Macintosh Requirements 1 8 Cabling Requirements 1 9 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 Ins
21. ackable hubs and unmanaged Ethernet fixed port repeaters Lifetime One year if not registered Power supply and fans in these stackable hubs and unmanaged repeaters One year Other hardware products One year Spare parts and spares kits 90 days If a product does not operate as warranted during the applicable warranty period 3Com shall at its option and expense repair the defective product or part deliver to Customer an equivalent product or part to replace the defective item or refund to Customer the purchase price paid for the defective product All products that are replaced will become the property of 3Com Replacement products may be new or reconditioned Any replaced or repaired product or part has a ninety 90 day warranty or the remainder of the initial warranty period whichever is longer 3Com shall not be responsible for any software firmware information or memory data of Customer contained in stored on or integrated with any products returned to 3Com pursuant to any warranty SOFTWARE 3Com warrants 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 magnetic media containing software against failure during the warranty period No updates are provided 3Com s sole obligation hereunder shall be at 3Com s discretion to refund the purchase price
22. again that your SPID and Phone parameters are entered properly and the D channel LED continues to flash without going out call your telephone company verify that you have been given the correct SPID and Phone information and ask whether the ISDN line is Point to Point If the ISDN line is Point to Point be sure not to include the SPID in the configuration Also verify that the telephone company has configured the ISDN line properly for the 3Com Impact digital modem product see Table 1 1 If the D channel LED does not go out after these verifications call your reseller for line configuration and troubleshooting assistance a Ifthe D channel LED goes out the digital modem is ready to place and 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 the phone the B 1 or B 2 LEDs that were flashing will now remain lit until the call is disconnected If you do not hear a dial tone or cannot establish a call there is most likely a problem with the configuration of your ISDN line Call the telephone company and have it verify that your line is configured for circuit switched voice and data
23. ak to remote Sends break to remote modem with a length in multiples of 100 ms n x 100 ms in non error corrected mode only n 1 9 G End to end modem to modem 0 Disable default flow control 4 rable L MNP mode 0 Stream default 1 Block continued APPENDIX B AT COMMANDS REGISTERS AND RESULT CODES Table B 2 AT Command Set Summary for the Internal Analog Modem continued Command Function Example Description N H F Set preferred error correcting mode to be negotiated in a subsequent data connection MNP extended services MNP 10 fallback to 2400 bps V 22bis 1200 V 22 Link negotiation speed All fax commands AT fax sub command 0 Normal speed buffered 1 Direct 2 Reliable link 3 Auto reliable 4 Force LAPM 5 Force MNP Enables disables conversion of a V 42 LAPM connection to an MNP 10 connection 0 Disable 1 Enable 2 Enable inhibits MNP extended services initiation during V 42 LAPM answer mode detection phase Enables or disables fallback from MNP 10 to V 22bis V 22 0 Disable 1 Enable default 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 All fax commands Remote S Registers B 7 Remote S Registers The 3Com Impact digital modem supports the S registers listed in Table B 3 All S r
24. and show no evidence of wear or other physical damage If damage is apparent after close inspection contact your reseller for replacement cables 5 Monitor the status of the D channel LED a If you are connected to a live digital ISDN line the D channel LED remains lit for up to a few minutes after the self test but 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 a Ifthe 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 can be caused by a damaged cable a broken wire a damaged connector a nonstandard U interface proprietary AMI line coding or a problem within the telephone company network If the telephone wires at your site appear to be satisfactory call your local telephone company for repair of telephone company equipment and troubleshooting assistance a Ifthe D channel LED flashes for more than a few minutes without going out there is probably a mismatch between the settings of the ISDN line and the 3Com Impact digital modem configuration Troubleshooting Tips 3 3 Check the Service Profile Identifier SPID entry and the Phone information in the digital modem software configuration utility If you have verified once
25. atible PCs with a 25 pin serial port a DB 9 to DB 25 connection adapter is included with the digital modem The asynchronous RS 232 C port on the digital modem labeled Computer is a standard DB 9 female 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 To digital modem DTR 5 Signal Ground GND 6 Data Set Ready DSR From digital modem 7 Request to Send RTS To digital modem 8 Clear to Send CTS From digital modem 9 Ring Indicator RI From digital modem INSTALLING AND CONFIGURING tee THE DIGITAL MODEM This chapter describes installation and configuration of the 3Com Impact digital modem In combination with the instructions given in this chapter follow the instructions given in the appropriate PC or Macintosh computer user guide Refer to Figure 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 P g O K Wall RS232D RS232D ISDN BRI U ONLY Figure 2 1 Back Panel Power Switch and Connectors The LED status display shown in
26. chnical Data and Computer Software clause at 48 C F R 52 227 7013 3Com Corporation 5400 Bayfront Plaza Santa Clara California 95052 8145 For civilian agencies Restricted Rights Legend Use reproduction or disclosure is subject to restrictions set forth in subparagraph a through d of the Commercial Computer Software Restricted Rights Clause at 48 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 named LICENSE TXT If you are unable to locate a copy please contact 3Com and a copy will be provided to you Unless otherwise indicated registered trademarks are registered in the United States and may or may not be registered in other countries 3Com is a registered trademark of 3Com Corporation Async PPP Impact and QuickSelect are trademarks of 3Com Corporation 3ComFacts Ask3Com and NetFacts are service marks of 3Com Corporation CompuServe is a registered trademark of CompuServe Inc IBM AT and Power PC are trademarks of International Business Machines Corporation Apple Macintosh and Power Macintosh are trademarks of Apple Computer Corporation UL is a trademark of Underwriters L
27. conversion 2 V 120 V 120 Frame Type 0 frame default 1 Ul frame V 120 Maximum Frame Size range 240 256 256 Maximum frame size of 256 is used default 248 Maximum frame size of 248 is used for AdTran compatibility use 253 Multilink PPP 0 Disable 1 Enable default Multilink PPP Directory Number If the destination to which you are 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 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 IEEE 802 1 Globally Assigned MAC Address 4 PPP Magic Number Block 5 Public Switched Network Directory Number Multilink PPP Endpoint Identifier up to 20 characters If required this information is provided by your Internet service provider B 10 APPENDIX B AT COMMANDS REGISTERS AND RESULT CODES Digital Modem Result Codes Table B 4 3Com Impact Digital Modem Result Codes Table B 4 lists the 3Com Impact digital modem result codes Short Form Long Form Meaning 0 OK ndicates that the most recent command or action was successfully completed 2 RING ndicates that an incoming call is present and no AT Answer c
28. e Canadian Department of Communications Equipment Standards entitled Digital Apparatus ICES 003 These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no 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 m Reorient or relocate the receiving antenna m Increase the separation between the equipment and receiver m Connect the equipment into an outlet on a circuit different from the one which the receiver is connected to m Consult the dealer or an experienced radio TV technician for help The user may find the following booklet prepared by the Federal Communications Commission helpful The Interference Handbook This booklet is available from the U S Government Printing Office Washington D C 20402 Stock No 004 000 00345 4 NOTE In order to maintain compliance with the limits of a Class B digital device 3Com requires that you use quality interface cables when connecting to this device Changes
29. e status of the second TEI using SPID 2 This information is provided only if your carrier requires a second directory number This field is read only 0 3Com Impact digital modem has not attempted initialization 1 3Com Impact digital modem has initialized successfully using SPID 2 2 3Com Impact digital modem has failed initialization using SPID 2 U Interface Status This field is read only 0 U interface is not synchronized with the switch 1 U interface is synchronized and ready B Channel Data Rate 56 56 Kbps default 64 64 Kbps Outgoing Call Type 0 Follow dial modifiers default 2 ISDN 3 Internal analog 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 3 Phone 2 Phone Out port Voice Automatic Number Identification Displays the phone number of an incoming voice call This field is read only Data Automatic Number Identification Displays the phone number of an incoming data call This field is read only continued Remote S Registers B 9 Table B 3 Remote S Registers continued Registers Descriptions S70 S71 73 S74 S80 S81 82 S83 Dynamic Bandwidth Allocation 0 DBA disabled 1 DBA enabled default B Channel Protocol 0 QuickSelect default 1 Async Sync PPP
30. e wires Specifically ISDN is a method of connecting to the public telephone network using digital technology ISDN uses the existing copper wire and public telephone network infrastructure All existing voice services provided by the telephone companies are accessible using ISDN and for the first time high speed dial up data can be provided cost effectively to the mass market Two electrical interfaces are defined as part of ISDN The first and less expensive is Basic Rate ISDN or 2B D A Basic Rate Interface BRI has two 56 or 64 Kbps kilobits per second B Bearer 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 placed from an ISDN line may connect to remote sites that have analog POTS Switched 56 ISDN BRI or T1 telephone lines There is full compatibility with existing services and no need for ISDN BRI on both ends The other electrical interface which is somewhat more expensive is the ISDN Primary Rate Interface PRI PRI is based on the more expensive and higher speed T1 networks that are typically deployed at larger sites PRI consists of 23 B channels and one 64 Kbps
31. ector on the digital modem s back panel Plug the transformer end of the power cable into a standard 117V ac wall outlet 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 panel Connect the RJ 11 6 pin connector end of the RJ 45 RJ 11 ISDN cable to the RJ 11 ISDN wall jack CAUTION The 3Com Impact digital modem is designed to operate with Basic Rate ISDN 2B1Q U Interface network terminations An internal Network Termination device NT1 is built into the digital modem Do not connect the 3Com Impact digital modem ISDN port to a standard analog telephone jack or to an external NT1 device Make sure that it is connected to the ISDN jack 2 6 CHAPTER 2 INSTALLING AND CONFIGURING THE DIGITAL MODEM 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 self test diagnostic 10 Turn on the computer s power switch and restart 11 Go to the section Configuration for Apple Macintosh Computer later in this chapter to configure the 3Com Impact digital modem Configuring the 3Com Impact Digital Modem T
32. ectors 2 1 Front Panel LED Indicators 2 1 Configuration Dialog Box 2 8 1 1 1 2 B 1 B 2 B 3 TABLES Text Conventions ii Notice Icons ii ISDN Ordering Information by Switch Type 1 7 Pin Descriptions 1 9 Front Panel LED Indicator Definitions 2 2 AT Command Set Summary B 1 AT Command Set Summary for the Internal Analog Modem B 4 Remote S Registers B 7 3Com Impact Digital Modem Result Codes B 10 ABOUT THIS GUIDE Introduction This guide describes how to install operate and troubleshoot the 3Com Impact ISDN External Digital Modem referred to throughout this guide as the 3Com Impact digital modem If the information in the release notes shipped with your ig product differs from the information in this guide follow the release notes Be sure to read the README TXT or Read Me files 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 Instructions for using the AT command line set Appendix A Tabular summary of the AT command line set registers Appendix B and result codes Information about 3Com s technical support Appendix C ii ABOUT THIS GUIDE
33. egisters except SO are the 3Com extended registers Table B 3 Remote S Registers Registers Descriptions So Auto Answer 0 Disabled default 1 Enabled S50 ISDN Switch Signaling Type 1 AT amp T 5ESS Custom 3 NI 1 AT amp T 5ESS default 6 NI 1 NTI DMS 100 or Siemens EWSD S51 Phone 1 S52 Phone 1 Service Profile ID SPID 53 Phone 2 if required by your carrier S54 Phone 2 Service Profile ID SPID if required by your carrier 55 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 Terminal Initialization State Indicates the status of the first TEI using SPID 1 This field is read only 0 3Com Impact digital modem has not attempted initialization 1 3Com Impact digital modem has initialized successfully using SPID 1 2 3Com Impact digital modem has failed initialization using SPID 1 continued B 8 APPENDIX B AT COMMANDS REGISTERS AND RESULT CODES Table B 3 Remote S Registers continued Registers Descriptions 58 S59 S60 S61 S63 only for models with an internal fax modem 65 S66 Terminal Initialization State Indicates th
34. he 3Com Impact digital modem requires the five essential configuration parameters below 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 a ISDN Switch Type m Phone 1 local directory telephone number m SPID 1 Service Profile Identifier m Phone 2 if required by the telephone company a SPID 2 if required by the telephone company Each of these items is stored in special S registers within the digital modem These S registers are set by issuing ATSxx commands to the digital modem The Impact digital modem software will automatically issue the AT commands to set the S registers as part of the configuration process The following three sections describe how to configure the 3Com Impact digital modem using the Windows DOS or Macintosh operating systems respectively Configuring the 3Com Impact Digital Modem 2 7 After you configure the digital modem and verify that it is working properly you should install the TurboCom software Refer to the installation instructions that came with the TurboCom software This software is required only for IBM PC or compatible computers running Windows 3 X Configuration for IBM PC or Compatible Computer You can configure the 3Com Impact external digital modem for an IBM PC or c
35. her This precaution may be particularly important in rural areas CAUTION Users should not attempt to make electrical ground connections by themselves but should contact the appropriate inspection authority or an electrician as appropriate
36. hin the Other Hardware Products category of the 3Com Limited Warranty at the end of this guide 1 4 CHAPTER 1 INTRODUCTION Data Capabilities The 3Com Impact digital modem allows transmission of asynchronous data at speeds of up to 115 2 Kbps over digital ISDN connections with the highest reliability and error free performance possible With Multilink PPP a digital connection of up to 128 Kbps can be established by aggregating the two 56 Kbps or 64 Kbps ISDN B channels Note that the COM port speed of your PC limits the maximum data transmission rate to no more than 115 2 Kbps ISDN technology reduces call setup times by more than 50 compared to V fast V 34 analog modem setup times reducing the time it takes to establish a connection to under three seconds This high speed performance allows you to do the following Dial up the Internet at high data rates Access your office s LAN m 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 and receive calls over the ISDN line When you connect to another ISDN line setup times are reduced and voice quality is excellent Simultaneous Data and Voice Capabilities The 3Com Impact digital modem quickly processes data and voice calls simultaneously For e
37. load 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 Obtain the latest firmware file from the 3Com FTP site ftp 3Com com Copy the firmware file to your computer Double click the 3Com Impact icon to access the Configuration dialog box shown in Figure 2 3 Click the Tools button The Firmware and Tests buttons appear Use the Tests tool only under the direction of service personnel Click the Firmware button The Firmware dialog box appears CHAPTER 3 TROUBLESHOOTING A Select the firmware file that you copied from 3Com s FTP site and click OK to start the download to the 3Com Impact digital modem The download will take several minutes Click the Exit button to exit the utility For Macintosh Computers This section provides instructions on downloading firmware from your Macintosh to your digital modem Obtain the latest firmware file from the 3Com FTP site ftp 3Com com Copy the firmware file to your computer Double click the 3Com Impact icon to access the Utility dialog box Use the Diagnostics button only under the direction of service personnel Click the Update Firmware button Select the firmware file that you copied from 3Com s FTP site and click OK to start the download to
38. lows Enter sends the command line to your 3Com Impact digital modem A 2 APPENDIX A AT COMMAND SET OVERVIEW Follow these steps to use AT commands 1 Launch your communications software Be sure your communications software is in terminal mode 2 Be sure the digital modem is in command mode sometimes called local mode or terminal mode so that it interprets your commands 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 lt commands gt 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 or Enter After completing its tasks the 3Com Impact digital modem sends a message to the screen B AT COMMANDS REGISTERS AND RESULT ete e e e e a CODES The 3Com Impact ISDN digital modem commands are summarized in Table B 1 modem commands for the internal analog modem in Table B 1 remote S registers in Table B 3 and digital modem result codes in Table B 4 AT Command Set for the 3Com Impact Digital Modem Table B 1 summarizes the AT command set Table B 1 AT Command Set Summary Command Function Example Description A Answer incoming circuit switched digital modem call AT A amp C Serial port CD c
39. m One copy of Delrina WinComm Lite and WinFax Lite communications software m One DB 9 to DB 25 serial connection adapter ISDN Digital Line Configuration Requirements The 3Com Impact digital modem requires an ISDN digital telephone line that is properly configured for use with the digital modem 3Com has determined the optimal ISDN line configurations for the 3Com Impact digital modem and has provided that configuration data to many telephone companies To simplify the ordering process for an ISDN 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 directory numbers If your telephone company does not support simplified ISDN ordering codes refer to Table 1 1 for ISDN ordering information Present this ordering information to the ISDN line installer or telephone company service representative in your area Also make sure that your local telephone company installer provides an RJ 11 or RJ 45 connector for your ISDN line Computer System Requirements 1 7 Table 1 1 ISDN Ordering Information by Switch Type ISDN Switch Type Northern Telecom Siemens IS
40. mFacts 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 seven days a week Within this service you may choose to access CardFacts for adapter information or NetFacts for network system product information CardFacts provides adapter installation diagrams configuration drawings troubleshooting instruction and technical articles Document 9999 provides you with an index of adapter documents Support from Your Network Supplier C 3 NetFacts provides data sheets and technical articles on 3Com Corporation s hub bridge router terminal server and software products Document 8888 provides you with an index of system product documents Call 3ComFacts using your touch tone telephone International access numbers are Country Fax Number Hong Kong 852 537 5610 U K 44 144 227 8279 US 1 408 727 7021 Local access numbers are available within the following countries Country Fax Number Country Fax Number Australia 800 123853 Italy 1678 99085 Denmark 800 17319 Netherlands 06 0228049 Finland 98 001 4444 Norway 800 11062 France 05 90 81 58 Sweden 020 792954 Germany 0130 8180 63 U K 0800 626403 Support from Your Network Supplier If additional assistance is required contact your network supplier Many suppliers are authorized 3Com service partners who are
41. ncluded with models 3C872 and 3C877 use the AT command ATDT for connection to an analog modem using touch tone dialing or ATDP for connection to an analog modem using pulse dialing Using Communications Software to Place Calls If you are using standard communications software select a Hayes compatible modem configuration and dial out through the 3Com Impact digital modem Refer to your communications software documentation for more details Receiving Data Calls Incoming circuit switched data calls from other 3Com Impact digital modems or from ISDN devices and Sw56 equipment may be received by the digital modem If auto answer is disabled the default in register SO 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 enabled the call is automatically answered and a CONNECT message indicating the speed of the connection is delivered to the Computer port Using the Phone Out Port If you have analog touch tone telephones answering machines fax machines external analog modems or other analog telephone devices connect them to the 3Com Impact digital modem s RJ 11 modular jack labeled Phone Out on the digital modem s back panel see Figure 2 1 The 3Com Impact digital modem does not support pulse dialing
42. nies require two enter the number and corresponding SPID in the Phone Number 2 and SPID Number 2 fields Specify which device should receive the calls coming to Phone Number 2 Confirm that the parameters listed in steps 3 through 7 are correct Click the Update Configuration button to update this information to the 3Com Impact digital modem Reset the digital modem by turning the power switch off and then on again If the parameters match those registered at the telephone company ISDN switch the D channel LED lights for a few minutes flashes for several seconds and then turns off If the LED continues to flash or remains lit see Chapter 3 Troubleshooting Go to the section Placing and Receiving Calls to place your first call Placing and Receiving Calls 2 15 Placing and Receiving Calls This section illustrates how to place and receive a variety of calls with your 3Com Impact digital modem The digital modem uses AT commands and S registers for call management See Appendix A AT Command Set Overview for instructions on use of the AT command set and Appendix B AT Commands Registers and Result Codes for a tabular summary of the AT command lines Placing ISDN Data Calls When you need to place a call from your PC or Macintosh the 3Com Impact digital modem recognizes the AT command ATD to dial a digital ISDN data call Depending on the setting of register S60 56 Kbps default or 64 Kbp
43. number marked on the outside of the package and sent prepaid insured and packaged appropriately for safe shipment The repaired or replaced item will be shipped to Customer at 3Com s expense not later than thirty 30 days after receipt by 3Com WARRANTIES EXCLUSIVE IF A 3COM PRODUCT DOES NOT OPE LL BE REPAIR REPLACEMENT O PRICE PAID AT 3COM S OPTION THE FOREGOING WAR AND ARE IN LIEU OF ALL OTHER WARRANTIES EXPRE TORY OR OTHERW FOR A PARTICULAR P CUSTOMER S SOLE REMEDY SHA OPERATION OF LAW STATU MERCHANTABILITY AND FITNESS AUTHORIZES ANY OTHER PERSO WITH THE SALE INSTALLATIO 3COM SHALL NOT BE LIABLE U DISCLOSE THAT THE ALLEGE CUSTOMER S OR ANY THIR UNAUTHORIZED ATTEMPTS INTENDED USE OR BY ACCIDENT LIMITATION OF LIABILITY NEGLIGE PUNITIVE DAMAGES OF A FINANC MAI Y TENANCE USE PERFO DAMAGES Some states do not allow the exclusion o consequential damages for consumer products so apply to you This warranty gives you speci GOVERNING LAW This Limited Warranty s 3Com Corporation 5400 Bayfront Plaza Santa Clara CA 95052 8145 408 764 5000 MAINTENANCE OR USE OF D DEFECT IN THE PRODUCT D PERSON S MISUSE NEGLECT TO REPAIR OR ANY OTHE FIRE LIGHTNING OR OTH NO EVENT WHETHE CE SHALL 3COM BE LIABLE FOR KIND OR FO AL LOSS ARISING OUT OF OR RMANCE FAI 3COM OR ITS AUTHORIZED RESELLER HAS BEE TO ASSUME FOR IT A DER THIS WARRANTY R R BASED
44. ommand is outstanding 3 NO CARRIER ndicates that the most recent call attempts did not establish a call or that the physical SDN interface is not operational 4 ERROR ndicates that the most recent command or action was not successfully completed 7 BUSY ndicates that the most recent call attempt did not connect because the remote destination was busy 5 CONNECT 1200 ndicates 1200 bps analog modem connection 0 CONNECT 2400 ndicates 2400 bps analog modem connection 1 CONNECT 4800 ndicates 4800 bps analog modem connection 2 CONNECT 9600 ndicates 9600 bps analog modem connection 5 CONNECT 14400 ndicates 14400 bps analog modem connection 28 CONNECT 28800 ndicates 28800 bps analog modem connection 56 CONNECT 56000 ndicates 56000 bps digital modem connection 64 CONNECT 64000 ndi connection cates 64000 bps digital modem C TECHNICAL SUPPORT ete e e e Seoet 3Com provides easy access to technical support information through the variety of services described in this appendix On line Technical Services 3Com offers worldwide support through the following m 3Com Bulletin Board Service 3ComBBS a World Wide Web Site a Ask3Com on CompuServe 3ComFacts Automated Fax Service 3Com Bulletin Board Service 3ComBBS contains patches software and drivers for all 3Com products as well as technical articles This service is available via modem seven days a week 24 h
45. ompatible using either the Windows based installation program or the MS DOS based installation program Configuration Using Windows To configure the digital modem for an IBM PC or compatible computer using Windows 1 Insert the 3Com Impact DOS amp 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 installation and indicates when it is complete 4 Double click the 3Com Impact icon to access the 3Com Impact Configuration dialog box COM1 is the default COM port a If the digital modem is connected to COM1 the 3Com Impact Configuration dialog box appears as shown in Figure 2 3 Go on to step 5 a f the digital modem is not connected to COM1 the COM Port Provisioning dialog box appears Choose the COM port to which the digital modem is connected 2 8 CHAPTER 2 INSTALLING AND CONFIGURING THE DIGITAL MODEM Click Connect The 3Com Impact Configuration dialog box appears as shown in Figure 2 3 com 3Com Impact SDM Adaptar l Telegkern Campare aii lma Colter vania 208 Lrevballed Cites Yaa Garaza Pulia Marder SMD kinin E babari F ami then Wiihbni okopbera Humba iji Gerva Pookie dente 1
46. onnected If you have a digital modem with an internal analog fax modem models 3C872 and 3C877 you can have calls routed to the internal analog fax modem when the Phone Out port is busy To do this the digital modem must be configured to allow a call to be routed to both the Phone Out port and the internal analog fax modem as described in the section Configuring the 3Com Impact Digital Modem Protocol Support 2 19 Protocol Support Async Sync PPP Conversion One of the most unique and powerful features of the 3Com Impact digital modem is its ability to convert asynchronous Point to Point Protocol PPP into synchronous HDLC based PPP that can be transported in ISDN B channels to communications servers and routers that have integrated ISDN 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 PPP conversion software QuickSelect The 3Com Impact digital modem supports V 120 and Async Sync PPP conversion The digital modem uses a technique called QuickSelect so that you do not have to manually select the proper protocol for each ISDN call With QuickSelect enabled the default the digital modem automatically detects and uses the required protocol 3 gt TROUBLESHOOTING e te This chapter explains how to isolate and solve simple problems encounte
47. ontrol AT amp C2 D ATD5551234 DT ATDT5551234 DP ATDP5551234 Answers an incoming call amp CO forces CD to remain on at all times amp C1 forces CD to follow the state of carrier from the remote system CD turns on after CONNECT message is sent to host default amp C2 forces CD to remain on except temporarily after disconnect Dials an outgoing 56 64 Kbps circuit switched digital connection Dials an outgoing analog modem call using the optional V 32bis modem at a maximum modem line speed of 14 4 Kbps using touch tone dialing Dials an outgoing analog modem call using the optional V 32bis modem at a maximum modem line speed of 14 4 Kbps using pulse dialing continued B 2 APPENDIX B AT COMMANDS REGISTERS AND RESULT CODES Table B 1 AT Command Set Summary continued Command Function Example Description amp D amp F Q R SN SN DTR control AT amp DO AT command echo AT E0 Restore factory defaults AT amp F Hang up AT H Identification AT 10 Enter connect state AT O Result code control AT Q0 Serial port flow control AT Q1 Read all S registers AT R Read configuration register AT S60 Write configuration register AT S60 64 amp DO causes digital modem to ignore DTR from host amp D1 causes digital modem to enter command state on detecting on off transition of DTR amp D2 causes digital modem to hang up
48. ours 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 49 89 627 32 188 up to 9600 baud 49 89 627 32 189 Hong Kong up to 14400 baud 852 537 5601 Italy fee required up to 9600 baud 39 2 273 00680 Japan up to 14400 baud 81 3 3345 7266 Singapore up to 14400 baud 65 534 5693 Taiwan up to 14400 baud 886 2 377 5838 886 2 377 5840 U K up to 14400 baud 44 144 227 8278 U S up to 14400 baud 1 408 980 8204 ISDN V 120 1 408 654 2703 c 2 APPENDIX C TECHNICAL SUPPORT World Wide Web Site Access the latest networking information on 3Com s World Wide Web site by entering our URL into your Internet browser http www 3Com com This service features news and information about 3Com products customer service and support 3Com s latest news releases selected articles from 3TECH 3Com s award winning technical journal and more Ask3Com on CompuServe 1 Ask3Com is a CompuServe based service containing patches software drivers and technical articles about all 3Com products as well as an interactive forum for technical questions To use Ask3Com you need a CompuServe account To use Ask3Com Log on to CompuServe 2 Entergo threecom 3 Press Return to see the Ask3Com main menu 3Co
49. pany CAUTION f the ISDN line has been configured with only one telephone number Point to Point do not include the SPID 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 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 the appropriate fields in the Number 2 area Specify which device should receive the calls coming to Telephone Number 2 Click the Configure button to download the parameters listed in steps 5 through 10 to your digital modem s S registers 2 10 CHAPTER 2 INSTALLING AND CONFIGURING THE DIGITAL MODEM 12 13 14 15 If you have changed the Telephone Company Switch type you must reset the digital modem by turning the power switch off and then on Verify the configuration Check the status bar located beneath the Help Tools Configure and Exit buttons of the Configuration dialog box to verify correct configuration If the parameters were configured accurately and the digital modem is ready to send and receive calls the status bar fields will appear as shown below Note that
50. qualified to provide a 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 m Diagnostic error messages m A list of system hardware and software including revision levels Details about recent configuration changes if applicable If you are unable to contact your network supplier see the following section on how to contact 3Com C 4 APPENDIX C TECHNICAL SUPPORT Support from 3Com If you are unable to receive support from your network supplier technical support contracts are available from 3Com In the U S and Canada call 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 LIMITED WARRANTY HARDWARE 3Com warrants its hardware products to be free from defects in workmanship and materials under normal use and service for the following lengths of time from the date of purchase from 3Com or its Authorized Reseller Internetworking products One year Network adapters Lifetime Ethernet st
51. red with the 3Com Impact digital modem Problems may stem from incorrect option settings or improper installation Follow the steps outlined in this chapter There are no user serviceable parts inside your 3Com Impact digital modem Unauthorized opening of the unit will void the warranty Troubleshooting Tips Before you call 3Com s technical support organization for assistance check the following The power supply is connected and the power LED is on 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 modem has failed the self test and order a replacement If the LED goes off after the test has been completed the test has been successful Verify that the ISDN cable is connected to the digital modem and make sure it is connected to the ISDN wall jack 3 2 CHAPTER 3 TROUBLESHOOTING The 3Com Impact digital modem will not operate if connected to an analog telephone wall jack Make sure that the digital modem is connected directly into the ISDN wall outlet without connection to any intermediate telephone equipment an NT1 device is not required with this digital modem 4 Make sure that the cables provided by 3Com or a 3Com authorized reseller are in good condition
52. rotary telephones 2 18 CHAPTER 2 INSTALLING AND CONFIGURING THE DIGITAL MODEM A CAUTION The 3Com Impact digital modem is designed to operate with telephones that are compatible with the original AT amp T 2500 touch tone telephone standard 3Com guarantees proper operation of up to three compatible touch tone devices on the Phone Out port The digital modem is designed to provide power and ringing for these three devices on up to 100 feet of AWG 26 or heavier AWG wiring Although the digital modem may function satisfactorily at longer cable distances with more than two attached telephones proper operation at longer cable distances is not guaranteed in all situations Specialized telephone equipment most notably speaker phones that draw significantly larger amounts of power may not work at all on the digital modem s Phone 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 Port Incoming calls to the telephone number assigned to the Phone Out port ring at the Phone Out port unless you are busy on another Phone Out port call If the port is busy the incoming call is automatically disc
53. s 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 connection of 128 Kbps Note that both your service and the one that you are dialing into must support Multilink PPP or the virtual linking will not occur Multilink PPP is enabled by default Multilink configuration is facilitated through registers S80 S81 82 and S83 Additionally dynamic bandwidth allocation DBA in multilink mode is configured in register S70 Register S80 enables the default or disables Multilink PPP operation 2 16 CHAPTER 2 INSTALLING AND CONFIGURING THE DIGITAL MODEM By default the 3Com Impact digital modem dials the same number for both Multilink PPP channels If the destination to which the digital modem is dialing to establish a second Multilink PPP channel requires a different telephone number then this second telephone number is stored in register S81 By default this register is empty It must be configured before you establish each Multilink PPP call If the Multilink PPP destination is a single telephone number for both channels then be sure to clear register S81 by sending the command ATS81 lt blank gt to the digital modem
54. s 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 The utility program presents the Port Settings screen To move the cursor around the screen use the Tab key Select the Modem port and click OK The Utility dialog box appears 3 In the Phone Number 1 field enter the telephone number to which your digital modem is connected 4 Enter the corresponding Service Profile Identifier SPID in the SPID field for the telephone number you entered in the previous step 2 14 CHAPTER 2 INSTALLING AND CONFIGURING THE DIGITAL MODEM 10 11 You should have received this SPID from your telephone company CAUTION f the ISDN line has been configured with only one telephone number Point to Point do not include the SPID Specify which device should receive the calls coming to Phone Number 1 You can select Phone Port or Internal Fax Modem If your model has the internal analog fax modem 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 If you have a second telephone number associated with your ISDN telephone line some telephone compa
55. s 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 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 the Phone 2 and SPID 2 fields Specify which device should receive the calls coming to Phone 2 Confirm that the parameters listed in steps 5 through 9 are correct When these parameters are updated the information is read back to the screen Check to see that the values have been correctly entered Press F10 to update the information in the 3Com Impact digital modem Configuring the 3Com Impact Digital Modem 2 13 12 Reset the digital modem by turning the power switch off and then on again If the parameters match those registered at the telephone company ISDN switch the D channel LED lights for a few minutes flashes for several seconds and then turns off If the LED continues to flash or remains lit see Chapter 3 Troubleshooting 13 Press Esc to return to the main menu Once in the main menu exit the program 14 Go to the section Placing and Receiving Calls to place your first call Configuration for Apple Macintosh Computer To configure the digital modem for an Apple Macintosh computer 1 Insert the 3Com Impact Installer Diagnostic Utilitie
56. talling 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 for Apple Macintosh Computer 2 13 Placing and Receiving Calls 2 15 Placing ISDN Data Calls 2 15 Multilink PPP Calls With Dynamic Bandwidth Allocation 2 15 Placing Analog Modem Calls 2 17 Using Communications Software to Place Calls 2 17 Receiving Data Calls 2 17 Using the Phone Out Port 2 17 Placing Calls Using the Phone Out Port 2 18 Receiving Calls Using the Phone Out Port 2 18 Protocol Support 2 19 Async Sync PPP Conversion 2 19 QuickSelect 2 19 TROUBLESHOOTING Troubleshooting Tips 3 1 Downloading Firmware to Your External Digital Modem 3 5 AT COMMAND SET OVERVIEW AT COMMANDS 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 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 Support from 3Com C 4 Returning Products for Repair C 4 LIMITED WARRANTY FCC CLass B CERTIFICATION STATEMENT CANADIAN NOTICE 1 1 2 1 2 2 2 3 FIGURES Analog and Digital Network Access with the 3Com Impact Digital Modem 1 2 Back Panel Power Switch and Conn
57. the Space Bar Use the Space 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 rate supported by your computer s COM port The program does not allow you to select a data rate that exceeds the speed of your COM port Press F10 to connect to the 3Com Impact digital modem via the chosen COM port The Configuration screen will appear In the Phone 1 field enter the telephone number to which your digital modem is connected 2 12 CHAPTER 2 INSTALLING AND CONFIGURING THE DIGITAL MODEM 6 10 11 Enter the corresponding Service Profile Identifier SPID in the SPID 1 field for the telephone number you entered in the previous step You should have received this SPID from your telephone company CAUTION f the ISDN line has been configured with only one telephone number Point to Point do not include the SPID Specify which device should receive the calls coming to Phone 1 You can select Phone Port or Internal Fax Modem If your model has the internal analog fax modem Models 3C872 and 3C877 you can select both The Phone Port and Internal Fax Modem check boxe
58. the ISDN interface Green indicates a circuit switched data call Yellow indicates a circuit switched voice call If a call is in a dialing state the LED flashes When a call enters the active state the appropriate LED color stays lit When the call is disconnected the LED goes off B 2 Channel Indicator Indicates the activity state of the B 2 channel of the ISDN interface Green indicates a circuit switched data call Yellow indicates a circuit switched voice call If a call is in a dialing state the LED flashes When a call enters the active state the appropriate LED color stays lit When the call is disconnected the LED goes off Installing the 3Com Impact Digital Modem 2 3 Installing the 3Com Impact Digital Modem This installation procedure assumes that you are familiar with IBM and IBM compatible or Apple Macintosh computers If you are not refer to the user guide that accompanied your computer for instructions on hardware installation and operating system commands Installing the Digital Modem in an IBM compatible PC To install the 3Com Impact digital modem model 3C870 or 3C872 in an IBM or IBM compatible computer 1 Turn off the computer 2 Ensure that the 3Com Impact digital modem power switch is in the Off position 3 Insert 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
59. the TEI number s are not configured by the user The TEI number is provided by the telephone company for informational purposes only a Layer 1 UP a SPID 1 Init a TEI 1 Number from 0 to 127 a SPID 2 Init if required a TEI 2 Number from 0 to 127 if required Click Exit to leave the utility This completes the configuration procedure Install the TurboCom software Refer to the installation instructions that came with the TurboCom software After the TurboCom software is installed proceed to the Placing and Receiving Calls section Configuration Using DOS To configure the digital modem for an IBM PC or compatible computer using DOS Create a directory on the hard drive insert the 3Com Impact DOS amp Windows Installation Diagnostic Utilities diskette into the PC s diskette drive and copy all the files from the utility diskette to the hard drive Configuring the 3Com Impact Digital Modem 2 11 Copy the files to a new DOS directory For example to create a directory dddd on your C drive at the C gt DOS prompt type md c dddd To copy all files from the diskette to a directory dddd at the A gt DOS prompt type copy a c dddd Execute INSTALL from the hard drive At the C gt DOS prompt type INSTALL The configuration program launches and presents the Port Settings screen To move the cursor around the screen use the Up Arrow and Down Arrow keys To select a parameter use
60. tible or Apple Macintosh personal computer that includes instructions for the installation of hardware and software options to serial ports 3Com Impact Digital Modem Features The 3Com Impact digital modem provides the following A complete digital network termination Basic Rate ISDN NT1 Full ISDN signaling support of National ISDN and pre National ISDN service offerings m An asynchronous RS 232 C data port for connectivity to IBM or compatible PC and Apple Macintosh serial ports at rates of up to 115 2 Kbps a AT command set dialing m Interoperability support through standard protocols 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 a Dynamic bandwidth allocation DBA which allows you to place a voice call while a Multilink PPP call is active m Internal 14 4 Kbps analog fax modem V 32bis compliant for connection to non ISDN fax machines and modems applies to 3C872 and 3C877 models only m An analog voice port for attaching analog telephones answering devices and fax machines to the ISDN line A graphical user interface for digital modem configuration A comprehensive diagnostic test and LED status display One year limited warranty wit
61. xample you can send a fax or place a voice telephone call while maintaining a high speed connection to the office LAN you can also receive a voice telephone call while you are connected to the Internet 3Com Impact Digital Modem Package Contents 1 5 Analog Modem Capabilities The 3Com Impact digital modem models 3C872 and 3C877 includes an integrated V 32bis analog modem for data or fax transmissions of up to 14 4 Kbps over the ISDN line V 42bis data compression boosts analog modem throughput to up to 57 6 Kbps 3Com Impact Digital Modem Package Contents 3Com Impact digital modems are available in Macintosh and PC versions with or without a built 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 m One power cable with an ac wall transformer a One serial cable m One RJ 45 RJ 11 ISDN telephone cable a One 3 5 installation diskette 3Com Impact ISDN External Digital Modem User Guide 3Com Impact ISDN External Digital Modem Quick Start Instructions Additional Contents Model 3C871 m One copy of TurboCom Windows software m One DB 9 to DB 25 serial connection adapter 1 6 CHAPTER 1 INTRODUCTION Model 3C872 m One copy of TurboCom Windows software

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