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Dual 56K LAN Modem

User Guide

MODEL NO.
3C888

Part No. 1.018.1752
Published May 2000

http://www.3com.com/

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

Page 1: ...http www 3com com Dual 56K LAN Modem User Guide MODEL NO 3C888 Part No 1 018 1752 Published May 2000 http www 3com com...

Page 2: ...013 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 subpara...

Page 3: ...hat cannot be solved with problem solving actions in this guide contact the 3Com reseller from whom the equipment was purchased If the units are stackable only stack similar units WARNING Twisted Pair...

Page 4: ...s suivantes Les ports identifi s par les tiquettes LAN et Phone SELV Les circuits SELV Safety Extra Low Voltage tr s basse tension de s curit sont des circuits secondaires qui sont con us et prot g s...

Page 5: ...ente Collegare alle porte dell unit solamente apparecchi conformi ai requisiti della relativa interfaccia Le specifiche riguardanti la sicurezza delle porte sono le seguenti Porte contrassegnate dalle...

Page 6: ...onents Only equipment approved for use by your telecom company can be connected to the telephone port Avoid using a telephone which is connected to the unit other than a cordless type during an electr...

Page 7: ...ns 14 Hardware Description 16 Features 18 DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION LAN Side Connectivity Installing an Ethernet Hub 21 Wan Side The Two 56K Modems 22 Using the Modem Channels 22 Di...

Page 8: ...dditional Service Providers 71 Editing Service Provider Profiles 76 Associating Service Providers with Workstations on the LAN 76 Using a Connection Script 77 Configuring LAN Parameters 81 Configuring...

Page 9: ...Information 131 Contacting Technical Support 131 Downloading Firmware to Your Dual 56K LAN Modem 131 Resetting the Dual 56K LAN Modem 131 Reviewing Statistics 132 Synchronizing the LAN Modem Clock 134...

Page 10: ...GLOSSARY 3COM CORPORATION LIMITED LIFETIME WARRANTY REGULATORY AND APROVAL INFORMATION...

Page 11: ...checking TCP IP and IP address settings Chapter 3 Instructions on installing the Dual 56K LAN Modem Chapter 4 Instructions on configuring the Dual 56K LAN Modem for Internet access Chapter 5 Instruct...

Page 12: ...mand SETDefault 0 IP NETaddr 0 0 0 0 NOTE This guide always gives the full form of a command in uppercase and lowercase letters However you can abbreviate commands by entering only the uppercase lette...

Page 13: ...private corporate network or to receive calls into your LAN from up to ten previously defined remote sites For calls to a private network via the Internet where security is a consideration the LAN Mo...

Page 14: ...Internet Access Local Networking with Shared Private Network Access Users can share access to a remote private network such as a corporate office LAN while they continue to network locally This can i...

Page 15: ...for specific applications Figure 4 Local Networking and Dial out Access with Dial in Support OfficeConnect Dual 56K LAN Modem Private network Public telephone network Two analog POTS lines More connec...

Page 16: ...lit as long as power is supplied to the unit Message Not implemented AA MODEM 1 or 2 Green Auto Answer Shows the answer status for Modem 1 or 2 as follows Flashes during an incoming call Remains lit f...

Page 17: ...2 Connect the second RJ 11 analog cable from the wall outlet to this port PHONE 2 Connect an additional external analog device such as a telephone or fax machine to this port COLL Amber Ethernet Coll...

Page 18: ...4 Connectivity Two 56K integrated analog modems Built in four port 10BASE T 10 Mbps Ethernet hub Up to 25 users can be supported by adding an external Ethernet hub Two pass through analog voice ports...

Page 19: ...you to place a voice or data call while a Multilink PPP call is active Manual call connection and disconnection Remote Management Remote management via Web browser based interface Remote firmware upgr...

Page 20: ...mware posted on 3Com s Web site Fully upgradeable to future 56K standards Diagnostics LED status display Statistics display Warranty 3Com Corporation Limited Lifetime Warranty refer to the end of this...

Page 21: ...g an Ethernet Hub On the Local Area Network LAN side of the Dual 56K LAN Modem you can connect up to four computers and or printers directly to the unit s built in Ethernet hub This allows you to crea...

Page 22: ...multaneously Using the Modem Channels When you use the Dual 56K LAN Modem for its most common WAN application dial out remote access you can configure up to four remote destination profiles referred t...

Page 23: ...s have access to an open connection to a specified destination Note that speed may be affected when multiple users share a connection and attempt to download data simultaneously For a further explanat...

Page 24: ...aking the local private i e not publicly routable IP addresses of individual workstations attached to the LAN and translating them into a single publicly routable IP address assigned by the remote loc...

Page 25: ...AN Modem answers the incoming data call Depending upon your choice the following typical calling scenarios become possible Simultaneous Dial in and Dial out Calls If you configure the LAN Modem to mak...

Page 26: ...make use of the already open connection by returning any data packets to the dial in user on the open connection This leaves the second analog channel free for use provided you have not set the LAN Mo...

Page 27: ...Control Protocol and Bandwidth Allocation Protocol are used to negotiate the addition and removal of the second modem connection with the receiving device based on a user defined threshold The advanta...

Page 28: ...PP connection is established If you attempt to place a Use Two Channels call and the location you are calling does not support this functionality a connection may not be established at all The Virtual...

Page 29: ...r a user connecting to a remote Private Network through a VPN tunnel can eliminate long distance charges that might otherwise be incurred from dialing directly to the remote private network Figure 14...

Page 30: ...30 CHAPTER 2 DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION...

Page 31: ...ceConnect Dual 56K LAN Modem Companion Programs CD ROM Contains User Guide PDF and HTML Getting Started Guide PDF Adobe Acrobat Reader Web Browsers EZ LAN Wizard LAN Modem Desktop Manager Virtual FAX...

Page 32: ...If You Have a Static IP Address in this chapter TCP IP Settings Because the Dual 56K LAN Modem is an IP only router any computer attached to the Dual 56K LAN Modem must also have TCP IP installed for...

Page 33: ...hernet adapter refer to Adding TCP IP to Your Protocols List below for instructions on how to set up TCP IP Mac OS 7 6 or Later Simply perform the following check to see whether your computer is set u...

Page 34: ...g to your operating system Windows 95 and 98 To add TCP IP to your protocols list for Windows 95 or 98 You may be prompted for your Windows 95 or 98 installation disks or CD ROM 1 From the Control Pan...

Page 35: ...CP IP 5 Click OK to exit the Select Network Protocol Dialog box 6 Click OK again to exit the Network Dialog box You may be prompted to re boot your workstation 7 Run the EZ LAN Wizard again to optimiz...

Page 36: ...tocols tab as shown in Figure 19 Figure 19 Windows NT Protocols Configuration Window 3 Click Add The Select Network Protocol window appears as shown in Figure 20 Figure 20 Select Network Protocol Wind...

Page 37: ...st on your hard drive click Continue Otherwise insert the Windows NT 4 0 CD ROM and click Continue If you have Remote Access Service RAS installed on your PC after the appropriate files are copied to...

Page 38: ...to your protocols list for Windows 2000 You may be prompted for your Windows 2000 installation disks or CD ROM 1 From the Control Panel double click Network and Dial up Connections 2 Double click Loca...

Page 39: ...s section The LAN Modem is designed by default to work with a dynamically assigned network The instructions in this section are for advanced users only By default the LAN Modem is set up to establish...

Page 40: ...dem from a different LAN reset the LAN Modem before you begin To do so refer to Resetting the Dual 56K LAN Modem Chapter 10 For Windows 95 and 98 Users 1 From the Start menu select Settings and then C...

Page 41: ...window opens 4 Click Properties The Local Area Connection Properties window opens 5 Select Internet Protocol TCP IP and click Properties The Internet Protocol TCP IP Properties window opens 6 Write do...

Page 42: ...4 Installing the Dual 56K LAN Modem Once installed follow the steps in Chapter 5 Typical Configuration and note the extra step for Static IP setup For Macintosh Users 1 From the Apple menu select Con...

Page 43: ...45 It is recommended that you use the cable provided If however you choose to use another cable it must be a straight through 10BASE T Ethernet cable A crossover cable cannot be used to connect the LA...

Page 44: ...will need RJ 11 to RJ 11 cables that came with the analog devices for your analog phone port connections In some cases you may also need a country specific adapter To install the analog devices 4 Conn...

Page 45: ...mpletes the Dual 56K LAN Modem installation You are ready to go on to Chapter 5 to configure the LAN Modem for shared access to the Internet Or if you wish to configure the LAN Modem for shared dial o...

Page 46: ...46 CHAPTER 4 INSTALLING THE DUAL 56K LAN MODEM...

Page 47: ...dem for dial in support refer to Chapters 6 7 and 8 respectively The configuration windows shown in this chapter may differ slightly from what is displayed on your computer Typical Configuration The t...

Page 48: ...s set up for static IP addressing and you chose to follow the manual setup procedure for Static IP addressing as opposed to using the EZ LAN Wizard as described in the Getting Started Guide refer to t...

Page 49: ...n a safe place Figure 31 Set Password Window 3 Enter a password in the Password field and then enter the same password in the Password repeat field to confirm it If you do not wish to enter a password...

Page 50: ...ountry other than the United States the LAN Modem resets and then returns you to the initial Welcome screen Continue from Step 2 above The ISP Wizard appears If you do not want to use the ISP Wizard p...

Page 51: ...nect to your ISP refer to Chapter 7 Editing Service Provider Profiles after you have completed this typical installation procedure 12 In the User ID and Password fields enter your User ID and Password...

Page 52: ...odem page 56 Changing the LAN Modem IP Address for Static IP Users If you followed the steps in Chapter 3 Changing the LAN Modem IP Address for Static IP Users and chose to follow the manual setup pro...

Page 53: ...nternet connection If you would like to set up a connection to a remote Private Network refer to Chapter 6 Configuring the Dual 56K LAN Modem for Private Network Access Configuring Additional LAN Mode...

Page 54: ...e yourself with the Main Configuration Page and its various options A basic description is provided here Links From the Illustration The links from the illustration icons will take you to the followin...

Page 55: ...up a secondary set of buttons through which you can view statistics on System Current Call Last Call Last 10 Calls and Service Providers Dial in Brings up a secondary set of Dial in Configuration but...

Page 56: ...To create a shared WAN connection for more than four users on the Dual 56K LAN Modem you will need the following A 10BASE T Ethernet hub such as the OfficeConnect Ethernet Hub 8 A 10BASE T Ethernet ca...

Page 57: ...ou are using an OfficeConnect Ethernet Hub 8 insert the opposite end of the Ethernet cable into port 8 and then set the MDI MDIX switch to MDI that is pressed in Make sure that the LED associated with...

Page 58: ...58 CHAPTER 5 CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS...

Page 59: ...ld already have completed the following steps Run the EZ LAN tool or performed the TCP IP and IP Address check on your computer as described in Chapter 3 Installed the hardware as described in Chapter...

Page 60: ...t time your Web browser will go to the Dual 56K LAN Modem s initial configuration welcome window regardless of the start page to which your Web browser is set If you have already set up the LAN Modem...

Page 61: ...not wish to enter a Password leave the fields empty 4 Click Submit A message box indicates that your password has been set The Set Country and Telephone Numbers screen opens as shown in Figure 39 Figu...

Page 62: ...ovider Selection window appears as shown in Figure 41 Service Provider is the general term used by the LAN Modem to define any type of remote dial out destination For purposes of routing traffic the L...

Page 63: ...Configuration Steps 63 Figure 41 Service Provider Selection Window 9 Select New Private Network from the drop down list box and click Select...

Page 64: ...ssary An example would be dialing 9 for use with a PBX If not required leave this field blank 12 Optional In the Call Waiting Disable Command field enter the value you obtained from your telephone com...

Page 65: ...ess Subnet mask and if necessary Domain Name of the private network The IP Address and Subnet mask fields are mandatory 19 Under Callback Parameters check Enable Callback if you wish to have your priv...

Page 66: ...hich you are connecting requires a static IP address and subnet mask enter those values here Otherwise leave these fields empty 25 For Allow Automatic Call Initiation leave the default setting which i...

Page 67: ...lly configured workstation The following steps explain how this is done 1 Access the LAN Modem s main page by entering the following URL in your Web browser http 3com oc lanmodem Alternatively you can...

Page 68: ...illustration icons from the buttons on the left hand side of the page and from the text links below the illustration For each configuration screen context sensitive online help is available in the fr...

Page 69: ...configuration page Manual Calling Takes you to the Manual Calling page where you can manually place and disconnect calls Statistics Brings up a secondary set of buttons through which you can view sta...

Page 70: ...te where you can register your Dual 56K LAN Modem read any new and up to date information about your product and perform firmware upgrades to the LAN Modem as they become available To access this LAN...

Page 71: ...er profiles Associating service providers with specific computers Using a connection script Configuring LAN parameters Configuring modem control parameters Changing data call parameters Specifying a W...

Page 72: ...ser ID ISP Password ISP DNS Address required only if your ISP does not use dynamic IP addressing Optional Call Waiting Disable Command your telephone company can provide you with this value Configurat...

Page 73: ...aiting Disable Command field enter the value you obtained from your telephone company for disabling Call Waiting If you have Call Waiting enabled on your line and you do not disable Call Waiting then...

Page 74: ...ervice Provider supports Callback functionality If you chose to enable Callback make the following selections Callback Delay Callback Delay is the amount of time the ISP will wait before calling back...

Page 75: ...as generated these packets Only if no such workstation is found are the packets delivered to the specified default workstation 17 For Enable Intelligent NAT it is recommended that you leave the defaul...

Page 76: ...the LAN If you wish to password protect the configuration profile of the Dual 56K LAN Modem refer to Locking and Unlocking the Configuration Associating Service Providers with Workstations on the LAN...

Page 77: ...need the following information from your service provider Your user name and password The Data Bits required by the remote server either seven or eight The Parity setting for the remote server either...

Page 78: ...ween 1 60 seconds The SetPort command setport databit parity stopbit allows you to match the script to the communication port settings of the remote server The valid databit is 8 or 7 The valid parity...

Page 79: ...provider Click OK when finished The Parity dialog box opens 6 Enter the Parity setting required by your service provider Enter e if the remote server requires Even parity o if the remote server requi...

Page 80: ...y changed to lower case when the script is submitted Once completed your script will be automatically invoked each time you launch a call to your service provider Additional Configuration Buttons The...

Page 81: ...y the LAN Modem into a public Internet routable address whenever it has to communicate across the WAN You should leave the default unless you are certain that this value must be changed You may want t...

Page 82: ...options are provided Always Block default Choosing this option will block all NetBIOS traffic which has been generated on the local LAN from being passed to the WAN In this case calls will not be plac...

Page 83: ...rates when placing V 90 calls This section describes modem control parameters and provides instructions for changing these parameters Understanding Modem Controls Each service provider that you config...

Page 84: ...ame for both an ISP and a Private Network The selected Service Provider page opens 3 Click the Modem Settings button located at the bottom of the Service Provider s page A dialog box opens You are ask...

Page 85: ...s The Timeout Values are a useful means of controlling bandwidth efficiently while keeping telephone usage and Internet access costs down If there is no network activity on a call for a specified amou...

Page 86: ...tivity This inactivity timer is activated once the minimum call duration is satisfied and no further activity is detected For example if the minimum call duration is set to two minutes and the inactiv...

Page 87: ...2 Check this box to enable the LAN Modem to place outgoing calls on modem 2 If you want to prevent any outgoing calls from being placed on this line uncheck this box Outgoing calls are enabled by def...

Page 88: ...e field and then enter 192 168 1 29 in the IP address field This is an IP address that resides on the LAN Modem s default subnet but by default is not used by any attached workstations Now packets to...

Page 89: ...opens 2 Click the Workstation Configuration tab 3 Locate the Workstation for which you would like to reserve the IP address on the DHCP server 4 Check the box labeled Reserved 5 Click Submit If you wa...

Page 90: ...restored to the factory default settings all configuration changes are lost including your service provider profiles For instructions refer to Chapter 10 Resetting the Dual 56K LAN Modem Locking and U...

Page 91: ...a Remote Location This section provides instructions for dialing in to the Dual 56K LAN Modem from a remote location using either a modem or another analog LAN Modem in order to make configuration ch...

Page 92: ...log equipment connected to one of the PHONE ports Refer to Configuring Dial in User Parameters in Chapter8 Configuring the Dual 56K LAN Modem for Dial in Support for more information 1 Ensure that the...

Page 93: ...3 5 Internet should be chosen in the Type of Dial Up Server list box For Windows 98 users PPP Internet Windows NT Server Windows 98 should be chosen in the Type of Dial Up Server list box 9 Under Adv...

Page 94: ...LAN you must first set up the LAN Modem for Dial in access Refer to Chapter 8 Configuring the Dual 56K LAN Modem for Dial in Support for assistance Checking for Dual 56K LAN Modem upgrades The Dual 56...

Page 95: ...eneral parameters that apply to all dial in calls Creating a Dial in User Profile for each dial in profile up to ten that will make incoming calls to the server side Dual 56K LAN Modem Part II Configu...

Page 96: ...ote that unlike the LAN Modem Site to Site profile described later the Single User scenario does not provide for bidirectional LAN to LAN connectivity While authorized workstations attached to the cli...

Page 97: ...any device on any LAN to be able to communicate directly with any other device on any other LAN peer to peer networking Note that when you choose the LAN Modem Site to Site Dial in profile you must pe...

Page 98: ...gestions for configuring the Advanced dial in parameters for more information Once you have chosen a dial in scenario that best fits your dial in criteria you are ready to configure the server side LA...

Page 99: ...Peer Web Services for Windows 95 98 Check with your computer s accompanying documentation for more information Changing the Remote Administration Username and Password The Remote Administration accou...

Page 100: ...ial In Global Parameters window opens as shown in Figure 57 Figure 57 Dial In Global Parameters Window 3 In the Channels allocated for Dial in field select 1 to allocate only one telephone line for di...

Page 101: ...network with two or more LAN Modems and you have already designated another LAN Modem as Site A Choosing Site B will cause this LAN Modem to change its IP address to 192 168 2 1 This is to differenti...

Page 102: ...file on the central LAN Modem using the Dial in Wizard refer to the appropriate application below for specific Dial in Wizard instructions For more detailed descriptions of these scenarios refer to Un...

Page 103: ...l 56K LAN Modem for Dial in Support 103 The Dial In Wizard Profile Type Selection window appears as shown in Figure 58 Figure 58 Dial In Wizard Profile Type Selection Window 3 Select Single User from...

Page 104: ...gure 59 Dial In Wizard Password Window 4 Enter a unique Username and Password which the dial in user must enter when calling in to this LAN Modem This information will be entered in the Username and P...

Page 105: ...must configure Callback parameters for this LAN Modem from the Dial in User Parameters page Refer to Configuring Dial in User Parameters page 114 for instructions To configure the client side device...

Page 106: ...Wizard Profile Type Selection Window 3 Select LAN Modem Site to Site from the drop down list and then click Next The Dial In Wizard Password window appears as shown in Figure 62 Figure 62 Dial In Wiza...

Page 107: ...n Wizard Site Assignment Window 6 Using the drop down list box specify the site name you would like to designate for the dial in user s remote LAN Modem A B or C Note that this Site name must be diffe...

Page 108: ...to Part II Configuring a Client Device for Dial out Access page 109 for instructions Configure the second site LAN Modem as both a server side LAN Modem and a client side device following the same pr...

Page 109: ...uration Part II Configuring a Client Device for Dial out Access To configure a client device for dial out access to the server side LAN Modem refer to the appropriate section for your type of client d...

Page 110: ...1 The LAN Modem re initializes itself The front panel LEDs flash indicating a reset in progress Once the LAN Modem IP address has been changed you can no longer access the LAN Modem until your worksta...

Page 111: ...e following ready Callback Telephone number s that is the telephone number s of this LAN Modem Callback Username and Password should match the values entered in the Dial in Users Parameters page on th...

Page 112: ...Provider such as the location of the server side LAN Modem 4 In the Dial Out Prefix field if applicable enter the number required by your location to reach an outside line if necessary An example woul...

Page 113: ...e left blank if you have entered a Private Network IP Address If you want to access client LAN resources via domain name for example Site A enter an appropriate domain name 11 Specify Callback paramet...

Page 114: ...ing 19 In the Default Workstation for Incoming Packets field specify the workstation to which all unsolicited TCP UDP packets should be delivered Note that if the Enable Intelligent NAT field is set t...

Page 115: ...5 Figure 67 Dial in User Selection Screen 2 Choose either New Dial in User to create a new profile or choose an existing Dial in User from the drop down list and click Select The Dial in User Paramete...

Page 116: ...og modem or second analog LAN Modem on which attached workstations can share a single IP address using NAT Choose LAN Modem Site to Site if this user will be dialing in from another LAN Modem which is...

Page 117: ...the server if callback authentication is requested by the client 6 In the Callback Password field enter the password used by the server if callback authentication is requested by the client 7 In the C...

Page 118: ...Use the LAN Modem Desktop Manager on a client workstation to place a call manually 3 Enter an IP address or domain name of a server attached to the remote LAN Modem and place the call automatically N...

Page 119: ...Modem Desktop Manager is included on the OfficeConnect Dual 56K LAN Modem Companion Programs CD ROM Once installed the application resides in the Windows Tool Tray No configuration of the Dual 56K LA...

Page 120: ...e providers 5 Click Submit to save your changes Another option would be to delete the first ISP and then add it back as your second ISP Placing a Call Manually You can manually place a data call from...

Page 121: ...on such as ftp to transfer files Or you may enter a different URL in your Web browser to access the Internet Once a temporary call is established other workstations may join this call by clicking Part...

Page 122: ...ng Disconnecting Calls You can disconnect calls manually via the LAN Modem or the Desktop Manager or utilize built in timers to disconnect calls automatically Disconnecting Calls Manually To disconnec...

Page 123: ...he default is 120 seconds two minutes which is also the lowest value allowed for this field Idle Timeout In the fields Disconnect a data call after how long of an inactivity period enter the number of...

Page 124: ...124 CHAPTER 9 PLACING RECEIVING AND DISCONNECTING CALLS...

Page 125: ...g statistics Synchronizing the LAN Modem clock CAUTION There are no user serviceable parts inside your Dual 56K LAN Modem Unauthorized opening of the unit will void the warranty Checking the Basics Be...

Page 126: ...LED flashes If the LAN Status LED is not lit on the port to which a workstation is attached the LAN Modem does not detect the Ethernet link integrity signal Refer to During installation LAN Status LE...

Page 127: ...ose Internet Options 2 Click the Connection tab 3 Uncheck the box labeled Connect using proxy server Netscape Navigator 1 From the Edit menu choose Preferences 2 Under Advanced choose Proxies 3 Check...

Page 128: ...you launch your Web browser During installation Alert LED remains lit An internal failure Notify your reseller or technical support that the Dual 56K LAN Modem has failed the self test During installa...

Page 129: ...plication or LAN device is sending IP packets Enable NetBIOS filtering Refer to Chapter 7 NetBIOS Filtering for more information Make sure that the Dual 56K LAN Modem s data call timeout value is not...

Page 130: ...s loaded refer to your Web browser s documentation for instructions Click Refresh from your browser s menu bar to display the latest information Second channel is not automatically added as bandwidth...

Page 131: ...ollow these steps 1 From the Dual 56K LAN Modem Main Configuration Page click the Advanced button 2 Click the Maintenance button 3 Select the type of reset you would like to perform normal or factory...

Page 132: ...erstanding System Statistics The system statistics are described in Table 7 Table 7 Description of System Statistics System Statistics Description Product ID Displays the product ID of the Dual 56K LA...

Page 133: ...gan The call has been up for minutes seconds Indicates the length of time in minutes and seconds that this current call has been connected The connection has been idle for minutes seconds Indicates th...

Page 134: ...call was disconnected For example idle timer expired or manual disconnect Table 9 Last Call Statistics Description Last Call Information Description Table 10 Last 10 Calls Statistics Description Last...

Page 135: ...e the LAN Modem s Real Time clock 1 From the LAN Modem Main Configuration Page click the Advanced button 2 Click the Maintenance button 3 Click the Update LAN Modem s clock button you may have to scro...

Page 136: ...136 CHAPTER 10 TROUBLESHOOTING AND MAINTENANCE...

Page 137: ...rs to that portion of a larger network which relies only on direct cabling to connect all its devices without crossing into the domain of the WAN which consists of any pre installed telephone or cable...

Page 138: ...a LAN connected to the WAN You can connect a LAN to the WAN using a device such as a router which has the ability to establish a connection out to the WAN and in some cases receive connections in the...

Page 139: ...e that data is segmented into specific sized packets called IP packets that each packet contains source and destination information and that the form of this source and destination information is a 32...

Page 140: ...level of the network address In other words network in this context has a very specific and circumscribed meaning Beyond this network level it is up to a private organization s internal routers to pi...

Page 141: ...hin the string of the subnet mask s 32 bits the point at which the ones end and the zeroes begin is the point at which the subdivision is made The resulting subnet number is then added to the end of t...

Page 142: ...dress which in turn expands the Internet routing tables and causes them to have to be updated or it must be able to extend the use of the IP address it already possesses to accommodate a larger number...

Page 143: ...ion In the case of a LAN Modem dial in scenario in which one LAN Modem is configured to receive incoming calls and a second LAN Modem is configured for dial out access to the first LAN Modem using NAT...

Page 144: ...ose a delay on the transmission speed the data across the connection will be nearly 100 error free The current error correction standard is known as V 42 It is the most common error correction protoco...

Page 145: ...to digital conversion in the downstream path PBX devices such as those found in corporate telephone systems or some hotels may introduce additional conversions For assistance with locating an 56K serv...

Page 146: ...146 APPENDIX A NETWORKING PRIMER...

Page 147: ...lling the Virtual FAX Modem Installing the Virtual FAX Modem requires the following three steps Installing the Virtual Fax Modem Application on each workstation Installing the LAN Modem COM Port Drive...

Page 148: ...users will see the Phone and Modem Options screen 2 Click Add to add the new modem If installing on a laptop computer with a PCMCIA card you may prompted to choose the type of modem you want to insta...

Page 149: ...as shown in Figure 71 Figure 71 Virtual Fax Modem Parameters Page The following options are provided Enabled Check this box to enable or disable the Virtual Fax Modem By default this field is set to E...

Page 150: ...pports Class 2 0 fax communications only Class 1 or Class 2 fax applications are not compatible for sending faxes with the Virtual Fax Modem Make sure that any fax application you use is set for Class...

Page 151: ...done the following On the Remote Private Network Server Side Set up a PPTP tunnel server often called a tunnel terminator on the remote private network Examples would be a Windows NT server version 4...

Page 152: ...set up a workstation attached to the LAN Modem to establish a tunnel as follows Install the PPTP protocol in your workstation PPTP is included with Dial up Networking 1 3 which is included on the Com...

Page 153: ...al 56K LAN Modem Factory Defaults LAN Parameters LAN Modem IP Address 192 168 1 1 Subnet Mask 255 255 255 224 DHCP Server Enabled NetBIOS Filtering Always Block Use Data Compression No Use NAT Yes Dat...

Page 154: ...154 APPENDIX D FACTORY DEFAULTS...

Page 155: ...he 3Com Year 2000 web page http www 3com com products yr2000 html Table 13 Dual 56K LAN Modem Specifications WAN Interface Analog POTS telephone service provided by the telephone company WAN Analog Co...

Page 156: ...156 APPENDIX E SPECIFICATIONS...

Page 157: ...r higher central office CO The facility at which individual telephone lines in a limited geographic area are connected to the public telephone network client server A networking architecture that make...

Page 158: ...Transfer Protocol The protocol invoked when uploading or downloading files from a remote site via TCP IP hub A hub is a device consisting of ports into which two or more computers and other devices ca...

Page 159: ...ding data packets to their proper destinations according to network addresses contained within the packet headers Routers use address tables to perform this function and are considered intelligent in...

Page 160: ...d telephone network PSTN V 90 technology exploits the digital connections that most Internet and on line service providers use at their end to connect to the PSTN such as a T1 or an ISDN BRI line VPN...

Page 161: ...in the third party s product or from use of the software product not in accordance with 3Com s published specifications or user manual THIS 3COM PRODUCT MAY INCLUDE OR BE BUNDLED WITH THIRD PARTY SOFT...

Page 162: ...CLOSE THAT THE ALLEGED DEFECT OR MALFUNCTION IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY CUSTOMER S OR ANY THIRD PERSON S MISUSE NEGLECT IMPROPER INSTALLATION OR TESTING UNAUTHORIZED ATTEMPTS TO OP...

Page 163: ...inspection authority or electrician NEW ZEALAND Not all phones connected to the phone port will respond to incoming ringing Do not report this as a fault unless the same phone will not respond to ring...

Page 164: ...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 r...

Page 165: ...ss Drive Santa Clara CA 95054 If the device is causing harm to the telephone network the telephone company may request that you disconnect the equipment until the problem is resolved This registered d...

Page 166: ......

Page 167: ...ddress resetting workstation Macintosh 127 Windows 95 127 Windows NT 127 L LAN Modem Site to Site Dial in explained 97 LAN parameters configuring 81 understanding 81 LEDs description 16 monitoring 125...

Page 168: ...installing 147 installing COM Port driver 148 terminating calls 150 virtual private network using with Windows 152 virtual private network VPN creating 151 virtual private networks explained 29 W warr...

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