3Com AccessBuilder 500 User Manual Download

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Installation

1-21

Connecting to ISDN

Figure 1-9

Connect ISDN Cable Into A Proprietary ISDN Wall Box

Connect the supplied ISDN cable from the ISDN port into the ISDN wall

box. See

Figure 1-9

and

Figure 1-10

. (US models see the note on

page 1-6

)

CAUTION:

Do not connect the ISDN line into the

AccessBuilder 500

’s

LAN port as the ISDN line voltage could damage the unit.

Figure 1-10

Examples of ISDN Wall Boxes

Summary of Contents for AccessBuilder 500

Page 1: ... ACCESSBUILDER REMOTE OFFICE 500 USER GUIDE Part No 980 000037 001 Published March 1996 ...

Page 2: ...T 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48 C F R 52 227 19 and the limitations set forth in 3Com Corporation s standard commercial agreement for the software Unpublished rights reserved under the copyright laws of th...

Page 3: ...ay be marked with the letter N or colored black Yellow green wire to the Earth Ground plug terminal which may be marked with the letter E or the earth symbol or colored green yellow Do not connect the earth wire to any other pin The safety status of the interconnection port on this equipment are as follows Ports identified by the labels VOICE and ISDN TNV Ports identified by the labels MANAGER 10B...

Page 4: ...em with the unit that cannot be solved with problem solving actions in this guide contact your supplier Disconnect the power before moving the unit WARNING Twisted Pair RJ45 data port This is a shielded RJ45 data socket It cannot be used as a telephone socket Only connect RJ45 data connectors to this socket ...

Page 5: ...welches normalerweise mit P und braunem Zuleitungskabel gekennzeichnet ist Blaues Kabel an Anschluß Null der mit N bezeichnet ist und normalerweise mit blauem Zuleitungskabel versehen ist Gelbgrünes Kabel an Anschluß Erde der mit dem Erdungssymbol markiert ist Verbinden Sie niemals das Erdungskabel zu irgendeinem anderen Anschluß Der Sicherheitsstandard der Anschlüsse fuer dieses Gerät sind wie fo...

Page 6: ...der zu wartende Teile in dem Gerät vorhanden Wenn Sie ein Problem mit dem AccessBuilder 500 haben das nicht mittels der Fehleranalyse in dieser Anleitung behoben werden kann setzen Sie sich mit Ihrem Lieferanten in Verbindung Bevor der AccessBuilder 500 ausgebaut wird ist der Netzstecker zu ziehen ACHTUNG gedrehte paarfache RJ45 Datenanschluss Es ist eine abgeschirmte RJ45 Datenanschlußbuchse Sie ...

Page 7: ...identifiant les bornes de votre prise de courant Procéder comme suite Le fil qui est coloré en marron doit être connecté à la borne de la prise du courant qui est indiquée par la lettre L ou par la couleur rouge Le fil qui est coloré en bleu doit être connecté à la borne de la prise du courant qui est indiquée par la lettre N ou par le la couleur noire Le fil de couleur vert et jaune doit doit êtr...

Page 8: ...ecter uniquement des unités conformes aux normes relatives des interfaces de cet équipement Il n y a pas de parties remplaceables par les utilisateurs ou entretenues par les utilisateurs à l intérieur du moyeu Si vous avez un problème physique avec le moyeu qui ne peut pas être résolu avec les actions de la résolution des problèmes dans ce guide contacter votre fournisseur Débrancher l alimentatio...

Page 9: ...y Information 4 1 GETTING STARTED Introduction 1 1 AccessBuilder 500 Features 1 1 Benefits of ISDN 1 4 Using ISDN to Support Leased Line WAN Circuits 1 5 Pack Contents Checklist 1 6 Registering Ownership Of Your AccessBuilder 500 1 7 Pre installation Requirements 1 8 AccessBuilder 500 Front and Rear Panel Features 1 9 Front Panel 1 9 Front Panel Liquid Crystal Display 1 12 Rear Panel 1 13 ...

Page 10: ...1 24 Example Using Windows 3 1 Terminal Application 1 24 About Quick Configuration 1 27 Setting the Unit Name 1 28 Connecting to a Novell IPX Network 1 29 Connecting to an IP Host on the Same IP Network 1 31 Connecting to an IP Host on a Different IP Network 1 33 Connecting to the Internet or a PPP Router 1 35 Monitoring ISDN Line Usage 1 39 Setting Up a WAN Link 1 39 Examples of Typical ISDN Netw...

Page 11: ...ow Bridges Learn A 3 Bridging Between Remote Sites A 4 Building a Larger Network A 5 Multiple Paths Between Bridged LANs A 6 Network Topology A 6 Broadcast Storms A 6 Optimum Use of Resource A 7 Network Organization Structure and Physical Layout A 7 The Internet A 7 Routing IP and IPX A 8 IP Routing A 10 IPX Routing A 12 IP Addresses A 13 Subnet Masking A 14 Obtaining an IP Address A 16 Numbered a...

Page 12: ... WAN Port Connecting Cable V 11 X 21 Support B 5 WAN Port Connecting Cable V 24 V 28 Support B 6 WAN Port Connecting Cable V 35 V 36 Support B 7 Manager Port Connecting Cable B 8 LAN Port Connecting Cable 10BaseT B 9 LAN Port Connecting Cable AUI B 10 Ordering Information B 11 C GLOSSARY D TECHNICAL SUPPORT On line Technical Services D 1 3Com Bulletin Board Service D 1 Access by Modem D 1 Access b...

Page 13: ...INDEX LIMITED WARRANTY FCC CLASS B VERIFICATION STATEMENT ...

Page 14: ......

Page 15: ...th an ISDN bridge or router for the first time it is possible you may make mistakes We have tried to identify the likely errors you may make and have provided hints and tips to help you recover from error situations Once you have carried out the initial configuration of the unit using the Quick Configuration option you can carry out additional configuration to optimize the unit s performance on yo...

Page 16: ... installation and configuration instructions Chapter 1 An overview of bridging and routing and an introduction to IP and IPX protocols Appendix A Technical Information and cable specifications Appendix B Glossary of technical terms Appendix C Technical Support information Appendix D Icon Type Description Information Note Information notes call attention to important features or instructions Cautio...

Page 17: ...o 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 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 simultaneo...

Page 18: ...ller If the case or cover is not correctly fitted If the case is damaged If the unit begins to make an odd noise smell or smoke If the unit shows signs of a distinct change in performance Never install telephone wires during a lightening storm or install telephone connection sockets in wet locations unless the socket is specifically designed for wet locations Do not touch uninstalled telephone wir...

Page 19: ...ng on top of the unit s case Allow a clearance gap of at least a 150 mm from the rear panel of the unit to allow for cable access This product ostensibly complies with the electro magnetic compatibility EMC requirements of EN 55022 Class A and EN 50082 susceptibility However to fully comply with Class B of EN55022 the following prerequisites should be observed the WAN port must be attached to a sc...

Page 20: ...6 ABOUT THIS GUIDE ...

Page 21: ...t to central computing facilities through either a dial up on demand connection over the integrated services digital network ISDN or a permanently connected leased line The AccessBuilder 500 is designed to connect a LAN Local Area Network at one location with a number of other LANs at remote locations The LAN could comprise any number of PCs servers or other computing equipment which in an office ...

Page 22: ...f leased lines is their permanence and fixed cost No dialling is required but unlike ISDN you pay a fixed cost regardless of whether you transfer little data or high volumes of data 24 hours a day Overall ISDN is probably the most cost effective solution for small businesses However if your requirements to move data between sites is likely to increase the flexibility offered by the AccessBuilder 5...

Page 23: ...TE management port Support for full IP and IPX routing Protocol transparent bridging Sophisticated data packet filtering to provide network security Provides NetWare protocol spoofing Data compression based on an optimized Lempel Ziv algorithm Remote and local management Flash erasable programmable read only memory EPROM allowing the remote upgrading of the units operating system Uses simple netwo...

Page 24: ...en referred to as ISDN 2 carries two 64 Kbps or possibly two 56 Kpbs in USA user channels called B channels and one 16 Kbps control channel called the D channel The line service is presented into the customers premises through a standard RJ45 socket A significant aspect of the ISDN service is that it can be provided over the same wiring that was installed for the original telephone service Therefo...

Page 25: ...However as ISDN tariffs reduce this balance also changes ISDN can be used to provide effective backup of these point to point WAN circuits in two ways Firstly if the point to point circuit fails an ISDN channel can be dialled up automatically and quickly to provide an alternative path to the remote unit Secondly if the leased circuit becomes heavily loaded due to peaks in the traffic between remot...

Page 26: ...o 25 pin D type socket gender changer COM port adapter 1 x Control port cable remote management 1 x BT to RJ11 voice port converter 1 x Software Utilities Diskette 1 x AccessBuilder 500 User Guide 1 x AccessBuilder ISDN Access Router Software Reference guide 1 x Warranty Registration Card US model only 1 x NT1 Network Termination Unit It is important that you save the unit s box and protective pac...

Page 27: ...500 Pack Contents Registering Ownership Of Your AccessBuilder 500 A warranty registration card is enclosed in the box with your AccessBuilder 500 Please take a few moments before commencing the installation to fill in the card and post it to us ...

Page 28: ...nnections AUI and 10BaseT only one port can be used at a time A standard ISDN line wall socket to connect the ISDN cable to the ISDN port of the AccessBuilder 500 If a suitably sited wall socket is not already available then contact your telecommunications supplier for assistance A suitable cable to connect to your ISDN socket A 3 meter ISDN cable is supplied with this unit The ISDN telephone numb...

Page 29: ...l Features POWER This LED indicator shows the following On Power is connected to the unit and the rear panel On Off switch is set to the ON position Flash Indicates that the unit s main program is corrupted and needs to be reinstalled Off No power supplied to the unit See Troubleshooting on page 1 48 for more details ...

Page 30: ...e a visual indication of the activity status occurring on the LAN Slow flash Low LAN activity Medium flash Moderate LAN activity Quick flash High LAN activity LAN SEND This LED indicator provides confirmation that data is being transmitted to the attached LAN The LED flashes to provide a visual indication of the activity status occurring on the LAN Slow flash Low LAN activity Medium flash Moderate...

Page 31: ... Typically this would indicate that a serial link has gone down or that a configured port does not have a cable connected to it ALERT This LED indicator is application specific and lights to indicate that while the system is operating normally it has detected a change in state For example where an ISDN backup circuit or any other on demand circuits have been brought into use The ALERT LED can be d...

Page 32: ...low Figure 1 3 Front Panel LCD Display Display Meaning NoName Unit name when assigned 10 0 0 1 Internet protocol IP address when assigned LAN1 T R LAN port transmit and receive loading percentage displayed as a bar graph ISDN1 T R ISDN port transmit and receive loading percentage displayed as a bar graph WAN1 T R WAN port transmit and receive loading percentage displayed as a bar graph ...

Page 33: ...ephone on an ISDN line It is capable of supporting ringing current and call progress tones and supports analog devices to a maximum ringer equivalence number REN of one United Kingdom Providing one of the two ISDN B channels is not being used by the unit then a voice call can be made Incoming ISDN traffic carries both a voice and data identifier and depending on the type of transmission a voice ca...

Page 34: ...er 500 using the 9 pin D type to RJ11 Serial Manager cable supplied with the unit The port provides VT100 terminal emulation running at 9600 bps Refer to Appendix B for more information about cables You also need a proprietary communications software package such as Windows Terminal to communicate with the AccessBuilder 500 WAN This port is used to provide connection to a WAN via a private leased ...

Page 35: ...it to be directly connected to a LAN or network hub port as required If the LAN port is to be connected directly to a single PC or workstation then you must use the crossover cable supplied with the unit to enable communication with your PC s Ethernet adapter AUI The AUI port is used to provide a connection to an Ethernet network using any cabling media by means of a transceiver and AUI drop cable...

Page 36: ...away from Sources of electrical noise such as radios transmitters and broadband amplifiers Power lines and fluorescent lighting fixtures Water or moisture cannot enter the case of the unit Air flow around the unit and the side of the case is not restricted We recommend that you provide a minimum of 30mm approx 1 25 inch clearance around the unit To prolong the operational life of your equipment do...

Page 37: ... 500 see Rear Panel on page 1 13 2 Plug the other end of the mains lead into an adjacent electrical mains system outlet socket and if necessary turn on the power at the outlet socket 3 The AccessBuilder 500 performs a self test procedure Figure 6 2 which ends with the unit displaying its media access control MAC address for approximately ten seconds The display then alternates between NoName with ...

Page 38: ...connect directly to an Ethernet hub port To connect to a 10BaseT in house LAN socket that connects to your organization s network To connect to a single workstation using a 10BaseT crossover cable Connecting to an Ethernet Hub To connect directly to a hub 1 Connect the UTP cable not supplied to the 10BaseT port of the AccessBuilder 500 2 Connect the other end to a 10BaseT port on your hub ...

Page 39: ... In House LAN Connection Box To connect the AccessBuilder 500 to in house LAN 1 Connect the UTP cable not supplied into RJ45 socket marked LAN on the AccessBuilder 500 2 Connect the other end of the cable into the female socket of the in house LAN connection box as shown in Figure 1 7 ...

Page 40: ...connected to your PC and the socket marked LAN on the AccessBuilder 500 using a length of standard 10BaseT cable Figure 1 8 Using the 10BaseT Crossover To Connect To A PC Connecting to Your LAN Using a Transceiver You can use the AUI port to connect the AccessBuilder 500 to an Ethernet network using any type of cabling media such as 10Base5 10Base2 or fiber optic cable The transceiver must be corr...

Page 41: ...Connect the supplied ISDN cable from the ISDN port into the ISDN wall box See Figure 1 9 and Figure 1 10 US models see the note on page 1 6 CAUTION Do not connect the ISDN line into the AccessBuilder 500 s LAN port as the ISDN line voltage could damage the unit Figure 1 10 Examples of ISDN Wall Boxes ...

Page 42: ...te ISDN connections with a single B channel If you connect a handset to a unit connected to this type of ISDN service you cannot pass data while the Voice port is in use We recommend that you only connect voice equipment to ISDN services offering the standard 2 B channel Basic Rate service The Voice port has a British Telecom phone socket Use the BT to RJ11 converter supplied with the unit to conn...

Page 43: ...onnecting The Management Cable If your PC has a 25 pin COM port use the 9 pin to 25 pin adapter supplied with the AccessBuilder 500 to connect the manager cable to your PC as shown in Figure 1 12 Figure 1 12 9 Pin to 25 Pin Converter ...

Page 44: ...stage use the management system menus to make these changes For more information see the AccessBuilder ISDN Access Router Software Reference guide Starting Quick Configuration 1 Using a VT100 compliant terminal emulator setup the terminal emulation to VT100 with communications parameters set as follows select the COM port to be used for data transmission 9600 bits s 8 data bits 1 stop bit no parit...

Page 45: ...dows check box has not been checked d Now save this configuration as a Windows terminal emulator file for future use If you are using Windows 95 use the Hyperterminal application and configure it in the same way as described above Figure 1 13 The Main Menu Screen 2 If the terminal emulator has been correctly configured pressing RETURN displays the Enter Password screen 3 Enter the default password...

Page 46: ...1 26 CHAPTER 1 GETTING STARTED Figure 1 14 Quick Configuration Menu 4 At the command prompt enter QC The screen changes to display the Quick Configuration menu shown in Figure 1 14 ...

Page 47: ...command to configure the connection to the remote IP host Use the IN command to configure the connection to your Internet service provider s router You cannot configure the unit to be an IP bridge and IP router at the same time The AccessBuilder 500 talks to other AccessBuilder units using its own very efficient FastConnect protocol over the ISDN or WAN port connections If you need to communicate ...

Page 48: ... The name can be up to 12 characters long must contain no spaces and should where possible give an indication of the geographical location of the unit or the name of the users Manager LAN IP Address Type the IP address for this unit It must be a unique IP address on your network Manager LAN IP Mask Enter an appropriate IP subnet mask See Subnet Masking in Appendix A for more information about subn...

Page 49: ...submit these parameters Connecting to a Novell IPX Network To connect to a Novell network using FastConnect enter NO at the command prompt on the Quick Configuration screen to display the screen illustrated in Figure 1 16 Figure 1 16 Connecting To A Novell Network Complete the fields on this screen as follows Do you have a local server Use the Spacebar to toggle this field to Yes or No as appropri...

Page 50: ...n you do this the unit automatically makes a short call to the remote unit to interrogate the remote network for information about its servers When it has obtained the information it needs the call is automatically disconnected The unit then updates the autocall table so that when data is destined for a remote server the unit automatically dials the correct ISDN number and connects to the remote n...

Page 51: ...s screen as follows Remote ISDN Number Type the ISDN number of the remote unit that connects to the IP network Call Type Set the Call Type required for your ISDN line Toggle this field to the Call Type required by your ISDN service provider Remote IP Address Type the IP address of the remote IP host to which you want to connect Press CTRL E to submit this information An entry is made in the autoca...

Page 52: ...ntended data has been transferred To avoid this situation you can also configure the units at both ends of the link to implement a Firewall and or set the Maximum Call Duration in the ISDN parameters screen to reduce the amount of traffic permitted to pass across the link See the AccessBuilder ISDN Access Router Software Reference guide for more information about these features Alternatively you m...

Page 53: ...unit that connects to the remote IP network Call Type Set the Call Type required for your ISDN line Toggle this field to the Call Type required by your ISDN service provider IP Address of this unit s LAN Type the IP address of this unit This is the address you entered on the Name screen IP Mask of this unit s LAN Type the IP subnet mask you entered for this unit on the Name screen See Appendix A f...

Page 54: ... ports at both ends of the link See Appendix A for more information about subnet masks IP Address of the Remote Host By default this field is set to DEFAULT This indicates that this is the default route and all IP traffic that cannot be routed elsewhere is to be passed to the remote unit on the ISDN number you configure in this screen If you want to route IP traffic to a specific unit type the IP ...

Page 55: ...provider will be able to give you the correct values for each of these fields If you are connecting to a remote PPP router check with the system administrator of the remote network for the correct values for these fields Name of your Internet Provider or remote site Type the name of your Internet service provider or of the remote unit that connects to the remote IP network ISDN Number of the remot...

Page 56: ... of the ISDN link By default this field is set to UNNUMBERED indicating unnumbered links are being used If you are using numbered links type the IP address of the remote ISDN port on the unit to which you want to connect It must be on the same network or subnetwork as the local ISDN port IP Mask of the ISDN Link If you are using unnumbered links leave this field set to UNNUMBERED If you are using ...

Page 57: ...ttings at the remote router are then automatically configured when you press CTRL E to exit this screen The options are Default Use this option if you are connecting to another AccessBuilder 500 Also use this option if the remote unit is none of the following and amend the PPP parameters accordingly 3Com 3Com NETBuilder router Cisco Cisco router Ascend Ascend router Spider Spider Shiva router If y...

Page 58: ...to the remote unit for it to verify The password is case sensitive To ensure security it is recommended that the local password is different from the remote password CHAP Password for others to login to you By default this is set to UNUSED If you need to use a CHAP password enter the password provided by your Internet service provider or the system administrator responsible for the remote router Y...

Page 59: ...lder ISDN Access Router Software Reference guide for more information on these features Setting Up a WAN Link If you are using the AccessBuilder 500 to connect to a remote site over a leased line link the initial setup is very simple 1 Before you power on the unit connect an appropriate WAN cable to the WAN port on the rear of the unit If you have already powered on the unit switch it off and conn...

Page 60: ... this field at the default setting e If necessary change any of the other parameters to suit your WAN link In most cases the defaults can be used f Press CTRL E to submit this configuration The WAN port is now configured and provided the remote unit s WAN port has also been configured data will be passed across the link Enter SAVE at the command prompt to permanently store this configuration in th...

Page 61: ...uter You may need to combine two or more of these applications to provide full connectivity to your network This is easily done by repeating the Quick Configuration option as many times as is needed Novell Network Many organizations base their local area networks on Novell NetWare servers and users may need to access information stored on servers in other locations If you are using ISDN to connect...

Page 62: ...1 21 Connecting To A Remote Novell Network In the example shown in Figure 1 21 the Local Site is connected to a Remote Site The Local Site shown has several workstations and a server but could equally consist solely of workstations or even a single workstation such as in the case of a homeworker The Remote Site may be a central site for an organization or simply another like sized office If you ar...

Page 63: ...ere xxx represents the host ID of the individual devices on the subnet See IP Addresses in Appendix A for more information about addresses Typically IP bridging would be used to connect a back office or home office into a main site Any further network connections would be carried out from the main site An example of such a network is shown in Figure 1 22 During configuration you enter the ISDN num...

Page 64: ...e unnecessary and costly calls to your remote site You can also configure the AccessBuilder 500 units at both ends of the link to implement a Firewall and or Call Guillotine to reduce the amount of traffic permitted to pass across the link See the AccessBuilder ISDN Access Router Software Reference guide for more information about these features Alternatively you may wish to configure the AccessBu...

Page 65: ...work can generate an autocall and be routed over the AccessBuilder 500 If you need to connect to IP hosts on several networks you will need to use routing to be able to communicate with the different hosts The example shown in Figure 1 23 shows the Local Site connected to two Remote sites over ISDN All sites are connected using AccessBuilder 500 units Figure 1 23 IP Routed Network ...

Page 66: ...ts own proprietary high speed protocol However in order to connect with other routers it needs to be configured to use the slower PPP protocol PPP is used by many other routers Increasingly Internet service providers are offering access to the Internet over ISDN via an ISDN router PPP routing over ISDN allows a simple cost effective connection to the Internet or into a large organization s global ...

Page 67: ... cannot bridge and route the same protocol The local site shown in Figure 1 25 is a small business that needs data links to several of its clients and a connection to the Internet It has an IPX connection to access information on one client s NetWare server and IP routed connections to several IP hosts at different clients sites Finally there is a connection to the local Internet service provider ...

Page 68: ...efore contacting your 3Com reseller Malfunction Remedy If you cannot connect the unit to the network or PC Verify that your computer is equipped with an available serial port and that the correct cables and connectors are being used If in doubt contact the unit s supplier The POWER LED does not light Confirm that a The switched outlet socket of the electrical mains system supply is turned on The m...

Page 69: ...socket to confirm that it functions f Try using an alternate UTP cable to connect the unit to the ISDN service socket If other LEDs do not light during operation of the unit During normal operation the remaining unit LEDs should light and extinguish depending on the action being taken If the LEDs fail to light in accordance with their function refer to Front Panel on page 1 9 then contact your sup...

Page 70: ... and the mains lead has been removed from the unit s power socket 1 Using a small thin bladed screwdriver remove the fuse retainer cap The cap has a spring loaded locking feature which needs to be disengaged by pushing the cap inwards whilst turning it anticlockwise The fuse carrier and fuse can then be withdrawn from its socket 2 Renew the protection fuse with a fuse of the same type and rating 3...

Page 71: ...irectories which hold the following information programs and utilities Figure 1 27 Utilities Diskette Directory Structure Sub directory NOVELL Contains two dialler programs for use with Novell NetWare macdial exe uses the AccessBuilder s autocall on MAC address feature dialler exe allows for calling and clearing by using the ISDN telephone number Both of these programs need Novell ipx com to be ru...

Page 72: ... the private SNMP MIBs in ASN1 format for use with the 3Com Impresario network management application and for integration of a third party SNMP manager Sub directory DECNET Contains files which can be used for establishing ISDN calls in the DecNet environment ...

Page 73: ...over which the network extends and the amount of bandwidth required Large amounts of bandwidth can be provided easily within a LAN by connecting different segments together with a local bridge However it becomes impractical and expensive to extend this bandwidth over larger distances and it is therefore usual to interconnect local high speed networks using bridges or routers connecting over slower...

Page 74: ...ines some of the reasons why you might choose to configure the AccessBuilder 500 as a bridge or a router Read through the rest of this appendix for more explanation and to help decide which of the above conditions apply to your network A bridge is simpler to configure but a router can provide more security on a busy network and filter unwanted data transmissions more effectively If your network co...

Page 75: ...estination address of the frame If the address is already in its address table the bridge knows the destination is on the LAN and therefore rejects or filters the frame If the destination address is not in the address table the bridge transmits the data across the bridge It does this even if the destination device is on the local LAN because it does not recognize the destination station as local H...

Page 76: ...ciated with particular work groups are passed between specific segments Bridging Between Remote Sites The AccessBuilder 500 is able to send frames between LANs that may be separated by considerable physical distances It achieves this by making use of digital ISDN links ISDN services are usually operated by telephone companies PTTs or other service providers Figure A 1 shows two LAN segments A and ...

Page 77: ...g calls and switches to the protocol necessary for that connection If you are using ISDN to connect to different networks the two B channels can be used independently to connect to different networks at the same time Building a Larger Network Large networks of interconnected LANs can be established by using multiple bridges as illustrated in Figure A 2 The bridges build up their address tables If ...

Page 78: ... the network If one of the links or bridges fail the other bridges detect this and reconfigure their ports so that there is once again an active data path through the network Network Topology If your network topology is star shaped a combination of ISDN and bridging is usually the most efficient and successful option Routing is a better solution if your network topology is a complex mix of both le...

Page 79: ...d by routing protocols However when using the ISDN the source network can dial direct to the destination network and establish a point to point bridged or routed connection Generally when using this type of ISDN dial up link routing does not provide much extra benefit Network Organization Structure and Physical Layout Some organizations are structured into departments determined by the physical la...

Page 80: ...P node on LAN A could for example have an address 140 56 10 0 the node on LAN B an address 140 56 10 2 and the node on LAN C an address of 140 56 10 3 All the nodes therefore are able to share the same Class B network address regardless of their location on the bridged network However if there were NetWare nodes throughout the three bridged sites they would also share the same IPX network number I...

Page 81: ...urce station s hardware address and also the destination hardware address of the local router To direct the packet to its final network destination the source station must complete the Layer 3 network header with the destination network address of LAN 2 Others Ethernet Hardware Link Level Control ARP RARP Internet Protocol IP and Internet Control Message Protocol ICMP Transmission Control Protocol...

Page 82: ...go via Router D to get to Router B or it could go more directly across a single direct link between Router A and Router B Figure A 5 Data Packet Containing Hardware And Software Addresses IP Routing The local router contains within its routing table information which will allow it to determine the best data transmission route The type of information the router uses to make these assessments is pro...

Page 83: ...es would be costly When initially setting up the network the AccessBuilder 500 is manually connected over the ISDN for a three minute period in order to learn the topology of the rest of the network Once this has been performed the AccessBuilder 500 will only make ISDN calls to transmit data packets While this data transfer is in progress RIP updates will be piggybacked on to the call updating bot...

Page 84: ...ate networks on a network The network numbering must reflect that situation In a Novell IPX environment we could allocate IPX network numbers 00000111 to LAN A 00000222 to LAN B and 00000333 to LAN C Having configured the ports of the AccessBuilder 500 to accept this protocol routing will now occur between the remote network servers and workstations but addressed by different network numbers It sh...

Page 85: ...123 123 123 Network Host The divider between the two sections is moveable according to what class of IP address it is The class of address is defined by what the number is in the first address byte For a Class A IP address the number in the first byte will be in the range 00 to 126 For a Class B IP address the numbers in the first second bytes will be in the range 128 001 to 191 254 For a Class C ...

Page 86: ...e Network identifier and which are the Host identifier A subnet mask consists of a similar field structure to that of the IP address 123 123 123 123 For example 255 255 0 0 This means that the first two three digit bytes of the IP address the fields masked by 255 255 are to be recognized and used as the Network address and the last two bytes those set to 0 0 are to be used to identify the Host add...

Page 87: ... 123 0 24 means that only the first three bytes are to be recognized and used and the last byte can be ignored In this case any IP address appearing on the locally connected LAN in the range 193 123 123 0 to 193 123 123 255 will cause an autocall to be made to the destination network who s name is associated with that number in the ISDN Autocall table The name is then looked up in the ISDN Numbers...

Page 88: ...Huntmar park Drive Herndon VA 22070 Telephone 1 800 444 4345 Toll Free 1 619 455 4600 1 703 742 4777 You can also send e mail to these addresses hostmaster rs internic net host domain network changes and updates action rs internic net computer operations mailserv rs internic net automatic mail service info internic net automatic mail service for general enquiries refdesk is internic net enquiries ...

Page 89: ...rmation Center APNIC DOM c o Computer Center University of Tokyo 2 11 16 Yahoi Bunkyo ku Tokyo 113 Japan Admin Contact Nakayama Masaya MN89 Telephone 81 3 3812 211 ext2720 e mail nakayama nic ad jp Technical Contact Conrad David DC296 Telephone 81 3 3580 3781 or 3580 Fax 81 3 3580 3782 e mail davidc apnic net ...

Page 90: ...his example the Local Site uses the network address 191 000 100 xxx on its LAN The remote site uses the network address 191 000 200 on its LAN and the link uses 191 000 300 Figure A 6 Example Of A Numbered Link By default the ISDN port has an IP address of 10 0 0 1 This is set to allow remote Telnet connections to the unit to enable configuration but must be changed when configuring the unit to al...

Page 91: ...e connector configured to support one of V 11 X 21 for speeds up to 2 048 Mbps V 28 V 24 RS232 for speeds up to 19 2 Kbps V 35 V 36 for speeds up to 2 048 Mbps ISDN Connector Interface Provides a twin interface to a 2B D basic rate ISDN service via an RJ45 connector socket Voice Connector Interface Provides interface for analog telephony equipment via a British Telecom connector socket A BT to RJ1...

Page 92: ...re upgrades enhancements and configurations downloadable from network attached terminal or PC SNMP MIB II support with private extensions for management of unique features Bridge Characteristics 802 3 MAC layer bridge 802 1D spanning tree algorithm Support for bridge triangulation and link load sharing Performance LAN filtering rate 10000 frames per second LAN forwarding rate 4000 frames per secon...

Page 93: ...ed to a screened digital cable The ISDN cable must be used in conjunction with a three turn ferrite The product carries the CE certification mark to indicate conformance with the following EU directives LVD Low Voltage Directive Safety 73 23 EEC EMC Electro Magnetic Compatibility Directive 89 336 EEC TTE Telecommunication Terminal Equipment Directive 91 263 EEC The product conforms to I CTR3 based...

Page 94: ...ATION Dimensions and Operating Requirements Power Supply 240 V AC 50 60 Hz nominal UK and Europe Power Supply 110 V AC 50 60 Hz nominal USA Power Consumption 25 Watts Operating Temperature 0 40 C 32 105 F Humidity 0 90 non condensing ...

Page 95: ...terminates with a 25 way D type female connector The port can be configured to support V 11 signalling characteristics at data transfer rates up to 2 048 Mbps The WAN port connecting cable is not supplied with the unit The following signalling characteristics should be observed when purchasing or fabricating a suitable cable ...

Page 96: ...5 way D type female connector The port can be configured to support V 24 or V 28 signalling characteristics at data transfer rates up to 19 2 Kbps The WAN port connecting cable is not supplied with the unit The following signalling characteristics should be observed when purchasing or fabricating a suitable cable ...

Page 97: ... a 25 way D type female connector The port can be configured to support V 36 signalling characteristics at data transfer rates up to 48 Kbps The WAN port connecting cable is not supplied with the unit The following signalling characteristics should be observed when purchasing or fabricating a suitable cable 7 ...

Page 98: ...TECHNICAL INFORMATION Manager Port Connecting Cable The manager port cable terminates with an RJ11 connector at one end and a 9 pin male female D type connector The pin out table below show the pin outs for this cable ...

Page 99: ...teristics B 9 LAN Port Connecting Cable 10BaseT The 10BaseT port terminates with an RJ45 connector which can be connected to the 10BaseT port on another device The table below shows the pin outs for a straight through cable ...

Page 100: ...he AUI port terminates with a 15 pin female connector which must be connected to a transceiver on a LAN using an AUI drop cable This cable is not supplied with the unit The following signal characteristics must be observed when purchasing or fabricating a suitable cable ...

Page 101: ... RJ45 plug with 1 5 meters of UTP cable ISDN cable 733 000001 RJ45 to RJ45 plug with 3 meters of UTP cable ISDN cable 3C409000 25 pin to 25 pin D type plug with 3 meters of cable V 24 3C409001 25 pin D type plug to 34 way MRAC connector with 3 meters of cable V 35 3C409004 25 pin to 15 pin D type plug with 3 meters of cable X 21 733 000026 British Telecom socket to RJ11 converter UK only 980 00003...

Page 102: ...B 12 APPENDIX B TECHNICAL INFORMATION ...

Page 103: ...roprietary standard for using IEEE 802 3 protocol at 100 Mbps over unshielded twisted pair cable IEEE standards approval pending 802 3 An IEEE standard for the physical layer that specifies a CSMA CD protocol This is the standard protocol used for Ethernet Refer to CSMA CD Address The unique code assigned to each device or workstation connected to the LAN Age The process of removing an address fro...

Page 104: ...r systems Bandwidth The capacity of data communications system or channel Baseband A communication technique in which network cable is used to carry a single stream of data at a time Baud A unit of signalling speed equal to the number of signalling events in one second Bit Either of the digits 0 or 1 when used in the binary numeration system Eight bits equals a single byte Bridge A device that lin...

Page 105: ...Client server A user who is attached to a file server to recover and store files but the processing of the data or use of an application is carried out on the client machine Coaxial cable A twin conductor cable used for computer networking in either a thick or thin form This cable consists of a centre core wire stranded or single core covered by insulation a second conductor of woven wire and an e...

Page 106: ...erence model This layer is responsible for controlling message traffic Data packet packet A sequence of binary digits including data and control signals that is transmitted across a LAN or WAN DCE Data circuit terminating equipment DTE Data Terminal Equipment The physical interface and link access procedures between DTE and data circuit terminating equipment DCE DTMF Dial tone multi frequency the ...

Page 107: ...ly implemented within a router s software Frame The method by which a data packet is constructed to be sent across a network Usually assembled with header and footer information Gateway Another name for a router on a network HDLC High level Data Link Control OSI s bit orientated protocol Hop count The number of routing nodes between a source and destination device on a LAN or WAN Host A device or ...

Page 108: ... Learn A bridge learns addresses received at any of its interfaces and adds them to its filter address table MAC Medium access control a protocol for determining which device has access to the network at any one time Mbps A measurement of data transmission speed in megabits per second MAN Metropolitan area network a network that covers a city MIB Management information base NETBIOS Network Basic I...

Page 109: ...of the PPP protocol to ensure authentication of the connection between two devices Peer to peer network A network which contains workstations which are able to act as both client and client servers Piggyback A way of transmitting routing information over ISDN lines by adding it to valid data frames This avoids ISDN calls being generated solely for passing routing information Physical layer The fir...

Page 110: ...fic on either side of the bridge reduce the traffic or to provide security from unauthorized users SAP Source address protocol Segment A section of an Ethernet network typically connected by repeater or a bridge to another segment SPX Sequenced Packet Exchange Novell s guaranteed delivery version of IPX Session A logical connection between two communicating systems that allows for the transfer of ...

Page 111: ...xial cable Suitable for small networks Ticks A measurement of the time taken to pass information through a routed network Token Ring A network transport technology in which an electronic token that allows access to the network is passed around stations in the ring Topology The way that a network is physically laid out Transport layer The fourth layer of the OSI network layer model This is responsi...

Page 112: ...C 10 APPENDIX C GLOSSARY ...

Page 113: ...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 114: ...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 115: ...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 116: ...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 117: ...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 118: ...D 6 APPENDIX D TECHNICAL SUPPORT ...

Page 119: ...1 35 Internet 1 35 IP hosts on different networks 1 33 IP hosts on same network 1 31 Novell networks 1 29 WAN leased line link 1 39 contents checklist 1 6 D default password 1 25 E Ethernet 10BaseT port 1 18 AUI port 1 20 example networks 1 41 F front panel LEDs 1 9 fuseholder 1 14 I installation 1 16 10BaseT connections 1 18 AUI connections 1 20 ISDN connection 1 21 management terminal connection...

Page 120: ... POWER LED 1 9 power switch 1 14 PPP routers 1 35 problem solving 1 48 Q Quick Configuration 1 24 R rear panel 0 5 A T 250 V 1 14 10BaseT port 1 15 AUI port 1 15 fuseholder 1 14 ISDN port 1 14 MANAGER port 1 14 power socket 1 15 power switch 1 14 RESET button 1 14 VOICEport 1 13 WAN port 1 14 rear panel connections 1 13 registration card 1 7 reset button 1 14 returning products for repair D 5 S se...

Page 121: ...oftware 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 WARRAN...

Page 122: ...F ANY KIND OR FOR LOSS OF REVENUE LOSS OF BUSINESS OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION 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 Some states do not allow the exclusion of implied warranties or the limitation of incidental or consequent...

Page 123: ...matériel brouilleur Appareils Numériques NMB 003 édictée par le ministre des Communications 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 Relocate the equipm...

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