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3Com ACCESSBUILDER 7000, User Manual

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3Com ACCESSBUILDER 7000 User Manual Download Page 35

 

Troubleshooting Guide

 

3

 

-

 

5

 

Intermittent disconnects, high error rates, or excessive 

 

retransmissions

 

Perform a remote digital loop test as described in 

 

the AccessBuilder 

 

7000 AT Command Reference

 

.

 

Modem establishes and disconnects a call

 

You may have a poor telephone line connection. Disconnect and dial 

 

again.

 

The remote modem may have encountered an error correction 

 

disconnect, where the modem is configured to establish a call using error 

 

correction. If the modem cannot negotiate error correction, then a 

 

disconnect occurs.

 

The remote modem may be in a forced error correction mode 

 

(disconnect if there is no error control). Reconfigure your modem to 

 

V.42/MNP or buffer correction and try again.

 

Perform a local analogue loop test.

Summary of Contents for ACCESSBUILDER 7000

Page 1: ... ACCESSBUILDER 7000 TRIPLE MODEM MODULE USER GUIDE Part No 980 000048 001 Published June 1996 ...

Page 2: ...re GL7 1YT United Kingdom 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48 C F R 52 227 19 and the limitations set forth in 3Com Corporation s standard commercial agreement for the software Unpublished rights reserved under the copyright l...

Page 3: ...ection ports on this equipment are as follows Ports identified by the label PSTN and LEASE TNV Ports identified by the labels DTE SELV TNV telecoms network voltage is a circuit which under normal operating conditions carries telecommunication signals SELV safety extra low voltage is a secondary circuit which is designed and protected so that under normal and single fault conditions the voltage bet...

Page 4: ...Anschlüsse bezeichnet mit PSTN und LEASE TNV Anschlüsse bezeichnet mit DTE SELV TNV Telecoms Network Voltage Spannung des Telekommunikationsnetzwerks ist ein Anschluss der unter normalen Umständen Telekommunikationssignale enthält SELV Safety Extra Low Voltage Extra Sicherheitsspannung ist ein weiterer Anschluss der unter normalen Umständen und Fehlerkonditionen entworfen und gesichert wurde so da...

Page 5: ...nts Les ports marqués par les etiquettes PSTN et LEASE TNV Les ports marqués par les etiquettes DTE SELV TNV Telecoms Network Voltage tension réseau de télécommunications est un circuit qui dans des conditions d opérations normales transfert les signeaux télécoms SELV Safety Extra Low Voltage tension de sécurité extra réduite est un circuit secondaire désigné et protègé qui dans des conditions nor...

Page 6: ......

Page 7: ...LE Introduction 1 1 Principal Features 1 2 Implementation of V 32terbo 1 3 Typical Applications 1 5 Pack Contents Checklist 1 6 Registering Ownership of your Triple Modem Module 1 6 Pre installation Requirements 1 7 2 INSTALLATION AND OPERATION Overview 2 1 Installing The Module 2 2 Installing the Rear Card 2 3 Installing the Front Card 2 4 Connecting the Cables 2 5 Modem Lines 1 3 2 5 DTE Ports 1...

Page 8: ...Backup Operation 3 6 A MODEM SPECIFICATION AND INTERFACE PIN ASSIGNMENTS Transmitter Receiver Specifications A 1 Autodial Autoanswer A 2 Physical Description A 3 Approvals Information A 4 General Approvals Requirements A 4 Interference and Safety Requirements A 5 PBX and PABX Application A 6 Ringer Equivalence A 7 DTE Port Pin Assignments A 8 X 21 V 11 A 8 V 24 V 28 A 9 V 35 V 36 A 10 PSTN Port Ca...

Page 9: ... 1 3Com Bulletin Board Service D 1 Access by Modem D 1 Access by ISDN D 2 World Wide Web Site D 2 Support from Your Network Supplier D 3 Support from 3Com D 4 Returning Products for Repair D 5 INDEX LIMITED WARRANTY FCC CLASS A VERIFICATION STATEMENT ...

Page 10: ......

Page 11: ... installed and operational How to Use This Guide This table shows where to find specific information If you are looking for information on Turn to The Triple Modem Module s features and typical uses Chapter 1 Installation and descriptions of the front panel LEDs and rear panel connectors Chapter 2 Troubleshooting and problem solving Chapter 3 Technical information and cable specifications Appendix...

Page 12: ...then press the Return or Enter key Do not press the Return or Enter key when an instruction simply says type Text represented as screen display This typeface is used to represent displays on your screen for example Enter the unit s IP address Text represented as commands This typeface is used to represent commands that you enter for example CO IS NU Keys When specific keys are referred to in the t...

Page 13: ...n wet locations unless the socket is specifically designed for wet locations Do not touch uninstalled telephone wires or terminals unless the telephone line has been disconnected at the network interface Always exercise caution when installing or modifying telephone lines Do not spill food or liquids on the unit If the unit gets wet isolate the electrical supply and contact your 3Com reseller Do n...

Page 14: ...4 ABOUT THIS GUIDE ...

Page 15: ...ta compression and CCITT V 42 MNP error correction IN addition to the fast line speeds each modem can transfer data to the attached computer at speeds which can vary from 300 bps to 115200 bps The modems are compatible with a number of dialling methods and protocols such as asynchronous AT commands and CCITT V 25bis dialling which allow you to uses the modems in a variety of applications and envir...

Page 16: ...operation V 22 and Bell 212A 1200 bps full duplex 2 wire modem V 21 and Bell 103J 300 bps modems Support for leased line transmission protocols V 34 2 wire or 4 wire full duplex modems operating at data signalling rates of 33600 31200 28800 26400 24000 21600 19200 16800 14400 12000 9600 7200 4800 and 2400 bps Non proprietary V 32 terbo 2 wire or 4 wire full duplex modems operating at data signalli...

Page 17: ... current status of any of the three modems Easy to install configure and support Implementation of V 32terbo Support of the V 32terbo transmission protocol is included as a feature in the modems V 32terbo is a non proprietary extension of the widely used CCITT V 32bis standard which increases the maximum data signalling rate from 14400 to 19200 bps over dial up links or private lines Compatibility...

Page 18: ... data transfer rate is negotiated between the two using the default configuration settings When using the higher line speeds made available by V 32terbo the throughput rate can be increased further by using the modem s error correction and data compression facilities Compression factors remain virtually unaffected by the increase in line rate thereby producing a real improvement in data transmissi...

Page 19: ... Figure 1 1 a large number of remote users connect to the central site s AccessBuilder 7000 and gain access to the corporate LAN and its facilities through a terminal server such as the 3Com CS3000 3100 series The advantage of this method is that all devices on the corporate LAN can be accessed remotely by a large number of remote users Figure 1 1 Modem Connections To The Central Site ...

Page 20: ...m Module back card 1 x AccessBuilder 7000 Triple Modem Module User Guide This manual 1 x AccessBuilder AT Command Reference guide 1 x warranty registration card It is important that you save the box and protective packing material in case you need to store or transport your Triple Modem Module in the future Registering Ownership of your Triple Modem Module A warranty registration card is enclosed ...

Page 21: ...ly module s and the Management Controller Module if required The rack unit into which you install the AccessBuilder 7000 must allow for the door to be fully opened to remove existing modules or to install new modules During normal operation the door must remain closed You should have DTE and telephone connection cables available and have easy access to telephone connection points If you are using ...

Page 22: ...1 8 CHAPTER 1 TRIPLE MODEM MODULE ...

Page 23: ... how to connect to your DTEs and PSTN lines and how to read the LEDs on the module s front panel Ensure you read the safety information at the front of this guide before commencing installation of the AccessBuilder 7000 Triple Modem Module Check that you have met all the pre requisites out lined in Chapter 1 and that you have access to the phone lines to connect your modems ...

Page 24: ... AccessBuilder 7000 system are designed to be hot swapable It is not necessary to turn off the AccessBuilder 7000 s power supply unit to install the Triple Modem Module The Triple Modem Module can be inserted any slot in the AccessBuilder 7000 chassis No connecting cables are supplied with the Triple Modem Module as standard For each of the three modems you need a PSTN line cable and or a 2 4 wire...

Page 25: ...assis and retain the screws Retain the blanking plate If you remove the module the blanking plate must be refitted to the chassis to aid the circulation of cooling air and to prevent dust and debris entering the unit 3 Insert the rear card with the RJ45 ports at the top of the card and slide it home along the guide rails so that it connects with the backplane 4 Secure the rear card into position u...

Page 26: ...in which you have already installed the rear card 2 Insert the front card into the slot ensuring that it is centered along the guide rails 3 Use the module s handles to push the card home into the chassis and lock it into place 4 Close and lock the chassis door To remove the card unlatch the handles to free the card from the back plane and pull the front card free from the chassis using the handle...

Page 27: ...is lifted any noise in the surrounding area interferes with the data and can cause corruption in the transferred data Private Line 2 4 6 The lower RJ45 connection in each pair connects to a private line Use this port to connect your modem to the line In some countries you may need to use an adapter to connect to your PSTN service provider s socket DTE Ports 1 3 7 8 9 Connect DTEs 1 through 3 to th...

Page 28: ...gured to act in different ways on receipt of this signal according to the AT D and AT M commands See AccessBuilder 7000 AT Command Reference for more information LINE On Line Indicates that the selected modem has seized the telephone line CONN Connect Indicates that the selected modem has established a valid connection to the remote device and is either negotiating the error correction and data co...

Page 29: ...running a test This may have been initiated either by an attached DTE via the Management Controller Module or by a remote DTE to which the modem has a communications link SEND Flashes on and off to indicate that the selected modem is receiving data from the equipment attached to the DTE interface REC Receive Flashes on and off to indicate that the selected modem is passing received data from the l...

Page 30: ...2 8 CHAPTER 2 INSTALLATION AND OPERATION ...

Page 31: ...y isolate the fault in your system by using a process of elimination If a problem continues to occur contact your supplier for assistance Modem Health POWER LED does not light Make sure that the front and rear cards are pushed fully home and that the rack enclosure is powered ON A problem is suspected after the power up self test Initiate a local analogue loopback with a pattern test If the modem ...

Page 32: ... DCD using the AT C0 command Check that the character echo command is enabled using the ATE command Check that the DTE dialler type configuration option is set to AT Refer to the AT M or AT Q command description Check that the response codes configuration option is enabled using the ATQ command Make sure that all AT commands are terminated with a carriage return Check that the ASCII value of a car...

Page 33: ...oes not provide DTR to the modem check that the modem s DTR signalling configuration option is set to ignore the state of DTR Check that all cables are attached to the right connectors at the rear of the modem Modem goes off hook answers but does not connect Perform a local analogue loop test and check that data entered at the DTE is echoed back to the DTE Check that the originating modem s config...

Page 34: ...s If using V 25bis bisynchronous dialling check that the correct character format uses two synchronous control characters and a start of text control character before the text block and an end of text control character after it If using V 25bis HDLC check that the correct character format uses flag address and control characters before the text block and a frame sequence check and flag after the t...

Page 35: ...ne line connection Disconnect and dial again The remote modem may have encountered an error correction disconnect where the modem is configured to establish a call using error correction If the modem cannot negotiate error correction then a disconnect occurs The remote modem may be in a forced error correction mode disconnect if there is no error control Reconfigure your modem to V 42 MNP or buffe...

Page 36: ...on Check that one modem is configured for answer mode and the other is configured for originate mode Check that both modems are using the same modulation scheme Dial Backup Operation Modems do not establish a PSTN link when the Private line fails Check that the communicating modems are configured to support dial backup as described in the AccessBuilder 7000 AT Command Reference Check that one mode...

Page 37: ... 16800 14400 12000 9600 7200 4800 bps CCITT V 32bis 14400 12000 9600 7200 4800 bps CCITT V 32 9600 4800 bps CCITT V 22bis 2400 bps CCITT V 22 1200 bps CCITT V 21 300 bps Bell 212A 1200 bps Bell 103J 300 bps Operation 2 wire or 4 wire synchronous asynchronous private line or 2 wire PSTN operation Output level Selectable 0 dBm to 15 dBm 600 ohms impedance UK versions set to 9 dBm for PSTN operation ...

Page 38: ... RTS CTS delay dependent on modulation format Equalizer Automatic adaptive equalizer Error correction V 42 LAPM and MNP4 Data compression V 42bis and MNP5 Autodial Autoanswer Method Pulse dial 10 pps rate Make period 33 msec Break period 67 msec UK version Interdigit period 800msec Tone dial On time 85 msec ID time 85 msec Duty cycle 50 Line Interface 600 ohm impedance Bell tinkle suppression prov...

Page 39: ...Busy Busy out via AT command or DTR Disconnect Call cleared selectable on loss of DTR and or no carrier for n seconds and or no data for n seconds and or a disconnect request is received from the remote modem in error correction Test Functions Local analogue loop local digital loop or remote digital loop available using AT commands Physical Description Power 16V ac 47 to 63 Hz 1A max Typical power...

Page 40: ... of this module should pay particular attention to this information This unit is approved for connection to the telecommunications systems specified in the instructions for use subject to the conditions set out in them Each modem is suitable for connection to the general switched telephone network GSTN PSTN and extensions on compatible PABXs It is also suitable for use on point to point private ci...

Page 41: ...h CEPT L1 signalling at a nominal frequency of 2280 Hz It does not require signalling or otherwise employ the frequency range 0 Hz to 200 Hz and there is no requirement for DC from the telephone line for correct operation This unit causes a line voltage drop of 0 2 V at a line current of 40 mA Interference and Safety Requirements Radio frequency interference may be caused by incorrect operation or...

Page 42: ...peration in the absence of proceed indication Automatic dialling facilities Tone detection for example ring tone busy tone Automatic answering of incoming calls Automatic clearing from call originating end Call progress monitor Series connection via optional cable Modem Any other usage will invalidate the approval of the apparatus if as a result it then ceases to conform to the standards against w...

Page 43: ...s for example telephones that can be simultaneously connected to one telephone line The REN value of each apparatus is added together and must not exceed 4 Unless otherwise marked a telephone can be assumed to have a REN of 1 0 Each modem on this unit has a ringer equivalence number REN of 4 0 ...

Page 44: ...s a female 26 pin V 24 connector and can be used with X 21 V 11 v 24 V 28 or V 35 V 36 signalling The cable pin outs for each type of cable are shown below X 21 V 11 The DTE port terminates with a 26 way miniature SCSI connector The port can be configured to support V 11 signalling characteristics The DTE port connecting cable is not supplied with the module The following signalling characteristic...

Page 45: ...ay miniature SCSI connector The port can be configured to support V 24 or V 28 signalling characteristics The DTE port connecting cable is not supplied with the module The following signalling characteristics should be observed when purchasing or fabricating a suitable cable ...

Page 46: ... terminates with a 26 way miniature SCSI connector The port can be configured to support V 36 signalling characteristics The DTE port connecting cable is not supplied with the module The following signalling characteristics should be observed when purchasing or fabricating a suitable cable ...

Page 47: ...cessed via the appropriate DIAL LINE socket on the card s interface module refer to the rear panel diagram in Section 1 2 for an exact reference of which socket services which modem on the communications card This is an RJ11 type socket that would typically be connected to a PSTN telephone wall socket using a cable conforming to the wiring diagram shown below ...

Page 48: ... a 2 or 4 wire connection which is accessed via the appropriate PRIVATE LINE socket on the card s interface module refer to the rear panel diagram in Section 1 2 for an exact reference of which socket services which modem on the communications card This is an RJ11 type socket that would typically be connected to a 2 or 4 wire private line outlet using a cable conforming to the wiring diagram shown...

Page 49: ...week 24 hours a day through the following on line systems 3Com Bulletin Board Service 3ComBBS World Wide Web site 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 or ISDN seven days a week 24 hours a day Access by Modem To reach the service by modem set your modem to 8 data bits no pari...

Page 50: ...ews 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 Country Data Rate Telephone Number Australia up to 14400 bps 61 2 9955 2073 France up to 14400 bps 33 1 69 86 69 54 Germany up to 9600 bps 49 89 627 32 188 or 49 89 627 32 189 Hong Kong up to 14400 bps 852 2537 5608 Italy fee ...

Page 51: ...s 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 network supplier see t...

Page 52: ...ll free Country Telephone Number Country Telephone Number Australia Sydney 61 2 959 3020 Japan 81 3 33457251 Melbourne 61 3 653 9515 Mexico 525 531 0591 Belgium 0800 71429 Netherlands 06 0227788 Brazil 55 11 546 0869 Norway 800 13376 Canada 905 882 9964 Singapore 65 538 9368 Denmark 800 17309 South Africa 27 11 803 7404 Finland 0800 113153 Spain 900 983125 France 05 917959 Sweden 020 795482 German...

Page 53: ...ion 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 11 29 95 Country Telephone Number Fax Number U S and Canada 800 876 3266 option 2 408 764 7120 Europe 31 30 60 29900 option 5 44 1442 275822 Outside Europe U S and Canada 1 408 492 1790 1 408 764 7290 ...

Page 54: ...B 6 APPENDIX B TECHNICAL SUPPORT ...

Page 55: ... 2 5 CORR LED 2 6 D DTE ports 2 5 F features 1 2 front card installation 2 4 I installation 2 2 front card 2 4 prerequisites 1 7 rear card 2 3 L LED selection button 2 7 LEDs front panel 2 6 LINE LED 2 6 N network supplier support D 3 O on line technical services D 1 P pack contents 1 6 ports 2 5 pre installation requirements 1 7 PSTN line ports 2 5 push button 2 7 PWR LED 2 7 R rear card installa...

Page 56: ...END LED 2 7 T technical information A 1 technical support D 1 TERM LED 2 6 TEST LED 2 7 Triple Modem features 1 2 overview 1 1 typical applications 1 5 troubleshooting 3 1 typical applications 1 5 V V 32terbo 1 3 ...

Page 57: ...ror 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 har...

Page 58: ...ECTION WITH THE SALE INSTALLATION MAINTENANCE USE PERFORMANCE FAILURE OR INTERRUPTION OF ITS PRODUCTS EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES AND LIMITS ITS LIABILITY TO REPAIR REPLACEMENT OR REFUND OF THE PURCHASE PRICE PAID AT 3COM S OPTION THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE AFFECTED IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF...

Page 59: ...nt this product may cause radio interference in which case the user may be required to take adequate measures Information To The User If this equipment does cause 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 the receiving antenna R...

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