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98

C

HAPTER

 8: C

ONFIGURING

 

THE

 D

UAL

 56K LAN M

ODEM

 

FOR

 D

IAL

-

IN

 S

UPPORT

This is because the called LAN Modem acts as the DNS server for workstations 
attached to the calling LAN Modem. An example of a LAN Modem Site-to-Site 
setup is shown in Figure 55.

Figure 55   

LAN Modem Site-to-Site Dial-in Profile Type

Choose 

LAN Modem Site-to-Site

 when your dial-in user will access a LAN 

Modem from another LAN Modem, where LAN resources are accessible on both 
ends of the connection.

Advanced Dial-in

The 

Advanced Dial-in 

profile applies to a network scenario in which a router 

other than a LAN Modem will be dialing into the Dual 56K LAN Modem. 
Advanced Dial-in assumes that both the Dual 56K LAN Modem and the other 
router have been manually configured for static IP addressing, and each employs a 
unique range of addresses, as shown in Figure 56.

Figure 56   

Advanced Dial-in Profile Type

Choose 

Advanced Dial-in

 if your LAN is using static IP addressing, or your dial-in 

user will be accessing a LAN Modem from a router other than a LAN Modem. 
Note that the Advance Dial-in is the most complex dial-in scenario and may 
require the assistance of your MIS administrator. Refer to “Creating a Private 
Network Service Provider Profile”, which includes suggestions 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 LAN Modem for dial-in access. Refer to “Part I. 
Configuring the Server-side Dual 56K LAN Modem for Dial-in Support” or 
“Creating a Private Network Service Provider Profile” to manually create or further 
define dial-in users.

Site A

LAN Modem

Site B

LAN Modem

192.168.2.1

192.168.1.1

192.168.1.1

192.168.1.1

The called LAN Modem

acts as DNS server to perform

workstation name-to-IP address

resolution for this call

The called LAN Modem

issues its own IP address

as WAN IP address for this call.

Public telephone

network

Alert

Power

Message

RD

AA

CD

SD

OH

RD

AA

CD

SD

OH

OfficeConnect Dual 56k LAN Modem

1

TX

COLL

2

3

4

LAN Status

MODEM 2

MODEM 1

Alert

Power

Message

RD

AA

CD

SD

OH

RD

AA

CD

SD

OH

OfficeConnect Dual 56k LAN Modem

1

TX

COLL

2

3

4

LAN Status

MODEM 2

MODEM 1

192.168.1.2

192.168.1.3

192.168.1.4

192.168.1.5

192.168.2.2

192.168.2.3

192.168.2.4

192.168.2.5

OfficeConnect

Dual 56K LAN Modem

Analog router

(other than LAN Modem)

192.168.1.1

192.168.1.2

100.101.102.2

100.101.102.3

100.101.102.4

100.101.102.5

192.168.1.3

192.168.1.4

192.168.1.5

Public telephone

network

Alert

Power

Message

RD

AA

CD

SD

OH

RD

AA

CD

SD

OH

OfficeConnect Dual 56k LAN Modem

1

TX

COLL

2

3

4

LAN Status

MODEM 2

MODEM 1

1

2

3

4

TX

LK

RX

CO

100.101.102.1

Содержание 3C888 - OfficeConnect Dual 56K LAN Modem Router

Страница 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 ...

Страница 2: ...7013 3Com Corporation 5400 Bayfront Plaza Santa Clara California 95052 8145 For civilian agencies Restricted Rights Legend Use reproduction or disclosure is subject to restrictions set forth in subparagraph a through d of the Commercial Computer Software Restricted Rights Clause at 48 C F R 52 227 19 and the limitations set forth in 3Com Corporation s standard commercial agreement for the software...

Страница 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 RJ45 data ports These are shielded RJ45 data sockets They cannot be used as telephone sockets Only connect RJ45 data connectors to these ports Wichtige Sicherheits Informatio nen WARNUNG Warnungen en...

Страница 4: ... les suivantes Les ports identifiés par les étiquettes LAN et Phone SELV Les circuits SELV Safety Extra Low Voltage très basse tension de sécurité sont des circuits secondaires qui sont conçus et protégés pour qu en conditions normales et à défaillance unique la tension n excède jamais la valeur de sécurité de 42 2 V en crête ou 60 V DC L appareil ne contient aucun fusible remplaçable par l utilis...

Страница 5: ...rrente Collegare alle porte dell unità solamente apparecchi conformi ai requisiti della relativa interfaccia Le specifiche riguardanti la sicurezza delle porte sono le seguenti Porte contrassegnate dalle targhette LAN e Phone SELV SELV Safety Extra Low Voltage è un circuito secondario ideato e protetto in modo tale che in condizioni normali e in caso di un unico guasto la tensione tra due parti ac...

Страница 6: ...ponents 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 electrical storm Equipment connected to the telephone port must be located in the same building as the unit Be sure nothing rests on the units system cables and that the cables are not located where they c...

Страница 7: ...ons 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 Dial in Functionality 25 Understanding Multilink PPP and Other Line Usage Options 27 The Virtual FAX Modem Windows 95 98 NT and 2000 28 Support for Virtual Private Networks VPNs 29 BEFORE YOU BEGIN Pac...

Страница 8: ...Additional 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 V 90 Modem Control Parameters 83 Changing Data Call Parameters 85 Specifying a WINS Server Address 87 Configuring the Local DNS Table 88 Reserving DHCP Addresses 89 Changing Your Password 89 Locking...

Страница 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 NETWORKING PRIMER What is a network 137 INSTALLING AND USING THE VIRTUAL FAX MODEM Installing the Virtual FAX Modem 147 CREATING A VIRTUAL PRIVATE NETWORK VPN TUNNEL Creating a Virtual Private Netwo...

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

Страница 11: ...n 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 Instructions on configuring the Dual 56K LAN Modem for private network access Chapter 6 Instructions on advanced configuration of the Dual 56K LAN Modem Chapter 7 Instructions on configuring the Dual 56K LAN...

Страница 12: ...mmand 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 letters and the appropriate value Commands are not case sensitive The words enter and type When you see the word enter in this guide you must type something and then press the Return or Enter key Do not p...

Страница 13: ...a 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 Modem also supports pass though VPN Virtual Private Network tunneling Dual 56K Analog Modems The V 90 56K ITU standard used on each of the Dual 56K s internal modems provides download speeds of up to 5...

Страница 14: ...d 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 include indirect access to the Internet through the private network s Internet connection as shown in Figure 2 Figure 2 Local Networking with Remote Private Network Access OfficeConnect Dual 56K LAN M...

Страница 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 connected 3 Com Status Reset TX D D 1 2 1 2 4 3 1 2 3 4 3 4 RX TX LK RX LAN Remote Access System 1500 WAN CO Power BRI ISDN U ANALOG SLOT 1 SLOT 2 STACKNET CONSOLE SUPER STACK 3Com Internet Alert Power Mes...

Страница 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 for the duration of the call Off when the LAN Modem originates a call CD MODEM 1 or 2 Green Carrier Detect Remains lit for the indicated modem if the Dual 56K LAN Modem receives a valid data signal ca...

Страница 17: ...E 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 Collision Status Flashes amber when some collisions are taking place on the Ethernet LAN Off indicates that no collisions are taking place on the Ethernet LAN Ports 1 4 Green Ethernet LAN Port Status On ...

Страница 18: ...74 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 for connecting up to two external analog devices Virtual Private Network VPN pass through capability using client software Virtual FAX Modem Allows Windows users on the LAN to access one or both mode...

Страница 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 upgrades Protocols IETF PPP RFC 1661 1662 1663 IETF Multilink PPP RFC 1990 IETF Password Authentication Protocol PAP and Challenge Handshake Authentication Protocol CHAP security RFC 1994 MS CHAP support...

Страница 20: ...rmware 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 User Guide for details Support for Internet Applications Support for applications that use the User Datagram Protocol UDP and the Transmission Control Protocol TCP The UDP protocol is used primarily...

Страница 21: ...ng 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 create a LAN and enable file application and printer sharing among the attached devices By connecting an external hub not included to one of the four LAN ports you can increase the number of users to a t...

Страница 22: ...imultaneously 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 to as Service Providers For each Service Provider that you configure you can choose whether to set up the connection as a single analog channel connection or as a Multilink enabled connection If two o...

Страница 23: ...rs 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 explanation of NAT and IP address translation in the LAN Modem see IP Address Translation Using NAT at the end of this section or refer to the Networking Primer in Appendix A Callback Capability When you con...

Страница 24: ...taking 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 location and used specifically for communication across the WAN Unlike a publicly routable IP address a local IP address cannot be used for communication across the WAN and is functional only within the...

Страница 25: ...LAN 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 make only one channel available for dial in calls you can have one dial in and one dial out call occurring simultaneously as shown in Figure 11 Figure 11 Simultaneous Dial in and Dial out Connections Sm...

Страница 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 Modem to combine its two lines using Multilink PPP Without this line sharing feature a separate outgoing call would be launched on the second channel during data transfers OfficeConnect Dual 56K LAN Mo...

Страница 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 advantage of BACP BAP is that it provides a higher probability of establishing a Multilink PPP call by providing a specific telephone number for the second modem to call during high traffic conditions Dynam...

Страница 28: ...PPP 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 FAX Modem Windows 95 98 NT and 2000 The Dual 56K LAN Modem can be used with the Virtual FAX Modem application included on the OfficeConnect Dual 56K LAN Modem Companion Programs CD ROM which enables...

Страница 29: ...er 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 shows a VPN tunnel connection to a remote private network using a single locally dialed ISP call Figure 14 VPN Tunnel Connection to a Remote Private Network via an ISP To create a VPN tunnel from a w...

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

Страница 31: ...iceConnect 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 Modem PhoneTools Fax Software Dial Up Networking 1 3 Aler t Pow er Mes sag e MO DE M1 RD AA CD SD OH MO DE M2 RD AA CD SD OH LANStatu s 1 TX COL L 2 3 4 OfficeConnectDu al56kLANMo dem Inc lud es Ge t...

Страница 32: ...r 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 the LAN Modem to communicate with the computer For Windows 95 98 NT and 2000 and for Macintosh OS 7 6 or later TCP IP is provided as part of your operating system However if you are using Windows an...

Страница 33: ...thernet 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 up for dynamic IP addressing TCP IP is automatically installed and set up in all Power Macintoshes 1 From the Apple menu select Control Panels and then TCP IP The TCP IP dialog box appears as shown in...

Страница 34: ...ng 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 Panel double click Network The Network dialog box appears Figure 16 Network Dialog Box 2 Click Add The Select Network Component Type dialog box appears Figure 17 Select Network Component Type Dialog Box...

Страница 35: ...TCP 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 optimize the settings on your workstation Windows NT 4 0 To add TCP IP to your protocols list for Windows NT 4 0 You may need your Windows NT 4 0 installation CD ROM 1 From the Control Panel double click Ne...

Страница 36: ...otocols 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 Window 4 Select TCP IP Protocol and then click OK ...

Страница 37: ...ist 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 your PC a message box asks whether or not you would like TCP IP installed for RAS If you select Yes you must select the device you want to access remotely and then click Close 7 After the appropriate...

Страница 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 Local Area Connection The Local Area Connection Status window opens 3 Click Properties The Local Area Connection Properties window opens 4 Click Install 5 Select Protocol and click Add The Select Network...

Страница 39: ...is 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 itself automatically as the gateway for computers on the LAN to access the WAN However if a computer is set up for static instead of dynamic IP addressing it will have a fixed IP address assigned as ...

Страница 40: ...odem 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 Control Panel 2 Double click Network and then select TCP IP from the scroll down list If you have multiple TCP IP entries select TCP IP for the Ethernet card associated with the Dual 56K LAN Modem 3 C...

Страница 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 down the values listed in the IP Address Subnet Mask and Default Gateway fields You will need to reenter this information later 7 Change the IP address subnet mask and Default Gateway fields as follows...

Страница 42: ...r 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 Control Panels and then TCP IP You may want to duplicate your current configuration so that your previous configuration is not overwritten 2 In the Connect Via field make sure Ethernet if iMac Ethernet ...

Страница 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 LAN Modem to your computer Power adapter you must use the power adapter provided in the package Installation Steps To install the Dual 56K LAN Modem 1 Turn off your computer 2 Connect your computer to ...

Страница 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 Connect the analog device or devices to the ports labeled PHONE 1 and PHONE 2 on the back of the Dual 56K LAN Modem and to your analog equipment as shown in Figure 27 Figure 27 Analog Equipment Connectio...

Страница 45: ...ompletes 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 out access to a Private Network such as a remote corporate office LAN refer to Chapter 6 To configure the LAN Modem for dial in support refer to Chapter 8 If the installation was not successful refer ...

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

Страница 47: ...odem 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 typical configuration covers the following main steps Figure 29 Main Steps for Typical Configuration Before You Start the Configuration Before you configure the Dual 56K LAN Modem you should already h...

Страница 48: ...as 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 the section Changing the LAN Modem IP Address for Static IP Users on page 52 once you have completed these initial configuration steps 1 Launch the Web browser on the computer that you attached to the...

Страница 49: ...in 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 leave the fields empty By entering a password you restrict access to the LAN Modem s configuration screens This password locks automatically after five minutes of inactivity 4 Click Submit A message...

Страница 50: ...country 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 preferring instead to set up a connection to a Private Network click Abort to reach the Dual 56K LAN Modem Main Configuration Page Refer to Chapter 6 Configuring the Dual 56K LAN Modem for Private Net...

Страница 51: ...nnect 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 for your ISP account 13 If your ISP requires a DNS address enter it in the DNS Address field If you are not sure leave this field blank 14 Click Continue A call is launched to your ISP and the TX LE...

Страница 52: ...Modem 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 procedure for static IP addressing as opposed to using the EZ LAN Wizard as described in the Getting Started Guide you must now change the LAN Modem s default IP address to recognize your statically con...

Страница 53: ...Internet 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 Modem Parameters The configuration you just performed guided you through the basic parameters that were needed to connect you to your ISP There are additional parameters for this ISP connection which wer...

Страница 54: ...ze 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 following pages Service Providers Takes you to the Service Providers page where you can configure connections to an additional ISP or to a remote Private Network and specify V 90 modem settings Workstations ...

Страница 55: ...s 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 buttons through which you can access the Dial in Wizard Dial in Global and Dial in Users profiles for configuring dial in support in the LAN Modem Advanced Brings up a secondary set of buttons through w...

Страница 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 cable two RJ 45 to RJ 45 connector ends not provided A 10BASE T Ethernet cable for each additional workstation If the hub you are using does not have an MDI MDIX switch you will have to use a crossover...

Страница 57: ...you 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 that Ethernet port is lit If it is not try changing the MDI MDIX switch setting You can now connect any additional computers and or printers to the remaining LAN ports LAN 1 3 2 4 LINE 1 PHONE 1 LIN...

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

Страница 59: ...uld 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 4 In addition you will have to obtain the following information from the network administrator at your private network Telephone number s you must dial to access this private network User ID and pas...

Страница 60: ...st 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 for its initial configuration access the LAN Modem Main Page by entering http 3com oc lanmodem in the location bar of your Web browser and skip to step 8 below A welcome message appears as shown in F...

Страница 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 Figure 39 Set Country and Telephone Numbers Screen 5 Choose your country from the drop down list 6 Enter your analog telephone number s including area code and click Continue ...

Страница 62: ...rovider 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 LAN Modem recognizes two categories of Service Providers Internet Service Providers for direct connection to the Internet and Private Network Service Providers for direct connection to a remote privat...

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

Страница 64: ...essary 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 company for disabling Call Waiting If you have Call Waiting enabled on your line and you do not disable Call Waiting then incoming calls may disrupt your modem connection The Dial Out Prefix and Call Wa...

Страница 65: ...ress 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 private network s remote access receiving device drop your call and immediately call you back whenever you connect to the network otherwise leave this and the remaining Callback fields at their defaults ...

Страница 66: ...which 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 is Yes If you select No you will have to manually launch a call to this service provider every time you want to connect You may want to change this field to No later on if you find that calls are bein...

Страница 67: ...ally 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 use the numeric form of this same IP address http 192 168 1 1 2 From the Dual 56K LAN Modem s main configuration page click the LAN Parameters icon The LAN Ethernet Parameters page appears 3 In the ...

Страница 68: ...e 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 frame below the main screen Links to other help topics are also available from this frame You may want to familiarize yourself with the Main Configuration Page and its various options A basic descripti...

Страница 69: ...s 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 statistics on System Current Call Last Call Last 10 Calls and Service Providers Dial in Brings up a secondary set of Dial in Configuration buttons through which you can access the Dial in Wizard Dial in...

Страница 70: ...ite 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 Modem Support web site at any time enter the following URL in your web browser http www 3com com support docs lanmodem For information on connecting an external hub to your LAN Modem refer to Chapter...

Страница 71: ...der profiles Associating service providers with specific computers Using a connection script Configuring LAN parameters Configuring modem control parameters Changing data call parameters Specifying a WINS server address Configuring the Local DNS Table Reserving DHCP Addresses Using selective password protection Changing your password Locking and unlocking the configuration Disabling password prote...

Страница 72: ...User 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 Configuration Steps To configure an additional Internet Service Provider profile follow these steps 1 From the Dual 56K LAN Modem s Main Configuration Home Page click the Service Providers icon The Service Pro...

Страница 73: ...Waiting 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 any incoming calls will disrupt your modem connection The Dial Out Prefix and Call Waiting Disable Command will automatically be applied to both telephone numbers that you enter below if you have mor...

Страница 74: ...Service 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 this LAN Modem By default this is set to 5 seconds Callback Timeout Callback Timeout is the amount of time that the LAN Modem will wait beyond the Callback Delay for the ISP to call back By default t...

Страница 75: ...has 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 default setting which is Yes in order for the LAN Modem to better support Internet applications and games The LAN Modem delivers all unsolicited TCP UDP packets to the workstation that is currently communi...

Страница 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 When you configure a Service Provider on the Dual 56K LAN Modem by default that connection is made available to every workstation attached to the LAN If for example you set up an Internet connection ...

Страница 77: ...l 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 none even or odd The number of Stop Bits required by the remote server either one or two Accessing the Script Configuration Page You can associate a unique connection script for each of your four se...

Страница 78: ...tween 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 is none even or odd The valid stopbit is either 1 or 2 The Transmit command transmit text string sends a text string to the remote server An example of a transmit string might be your account userna...

Страница 79: ...e 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 requires Odd parity or n if the remote server requires that parity be set to None Click OK when finished The Stop Bits dialog box opens 7 Enter 1 to set the stop bits to one or enter 2 to set the stop bit...

Страница 80: ...ly 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 Script Configuration page provides the following configuration buttons located along the bottom of the script text entry window The Submit button saves your script and returns to the Service Provider...

Страница 81: ...by 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 to change the default IP address when setting up dial in access between two LAN Modems This will allow you to distinguish between the two networks which by default are the same The LAN Modem s Dial in...

Страница 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 placed due to NetBIOS traffic and NetBIOS traffic will not be sent to the WAN once calls have been initiated If you have no need to perform file or printer sharing over your WAN connection choose this op...

Страница 83: ...erates 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 configure up to four is automatically associated with its own corresponding modem control profile If you would like to further define the performance of the modems for each service provider you may do so a...

Страница 84: ...same 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 asked to save any changes made to the Service Provider screen 4 Click Yes to close the Service Provider screen and open the Modem settings The Modem Connection Control page opens as shown in Figure 49 F...

Страница 85: ...ls 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 amount of time the call is automatically disconnected The Bandwidth on Demand Parameters allow you to change the threshold and time delays for adding and dropping the second modem channel of a Multilink ...

Страница 86: ...ctivity 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 inactivity timer is set to 15 minutes the call will be connected for at least 15 minutes To prevent a manual call from being disconnected due to inactivity enter 0 The default is 15 minutes The Desktop Mana...

Страница 87: ...e 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 default To disable all outgoing calls from being placed by any device on the LAN uncheck both boxes for Outgoing Call Control Configuring the Data Call Parameters To configure data call parameters follo...

Страница 88: ...me 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 company com will be routed to this unused IP address and will no longer launch automatic calls Another potential application of the Local DNS Table is to assign a domain name to a frequently visited ...

Страница 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 want to password protect the configuration profile of the ISDN LAN Modem refer to Locking and Unlocking the Configuration Changing Your Password A password allows you to restrict access to the Dual 56K...

Страница 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 Unlocking the Configuration If you chose to password protect the Dual 56K LAN Modem when you initially configured the unit you can lock and unlock the LAN Modem configuration parameters from this page...

Страница 91: ...m 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 changes To access the Dual 56K LAN Modem from a remote location you must have a Web browser and any PPP dialer software such as Windows 95 98 s Dial Up Networking installed on the remote computer Befor...

Страница 92: ...alog 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 two LAN Modems are on different subnetworks For instance one LAN Modem can be on the 192 168 1 x subnetwork and the other one can be on the 192 168 2 x subnetwork 2 In the local LAN Modem from which...

Страница 93: ...T 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 Advanced Options uncheck all boxes 10 Choose the TCP IP check box for Allowed Network Protocols Uncheck the boxes for NetBEUI and IPX SPX Compatible 11 Click TCP IP Settings The TCP IP Settings window o...

Страница 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 56K LAN Modem has an Upgrade Check feature which will query the LAN Modem s Internet homepage for available firmware updates You must have at least one Service Provider configured with Internet access ...

Страница 95: ...general 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 Configuring a client device such as an analog modem or second LAN Modem for dial out access to the server side LAN Modem Since the device that dials out to the server side LAN Modem may also be a LAN Modem ...

Страница 96: ...Note 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 client LAN Modem can share the connection to the remote LAN Modem workstations connected to the server LAN Modem cannot access client side resources Choose Single User Dial in when your dial in user wil...

Страница 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 perform both sets of configuration step sequences create a dial in profile and create a service provider connection on each LAN Modem In a LAN Modem Site to Site setup neither LAN Modem uses NAT for IP...

Страница 98: ...ggestions 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 LAN Modem for dial in access Refer to Part I Configuring the Server side Dual 56K LAN Modem for Dial in Support or Creating a Private Network Service Provider Profile to manually create or further defi...

Страница 99: ...s 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 account is a restricted version of a Dial in User Profile which allows for limited dial in access to the Dual 56K LAN Modem for remote configuration purposes only By default a Remote Administration accoun...

Страница 100: ...Dial 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 dial in calls the default Choose 2 to allow both telephone lines to be used for dial in calls either by a single user making a Multilink PPP call or by two users dialing in simultaneously 4 In the Allo...

Страница 101: ...e 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 differentiate between the two LAN Modem subnet address which by default are the same Choose Site C if you are setting up a site to site network with two or more LAN Modems and you have already designated anoth...

Страница 102: ...ofile 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 Understanding the Three Dial in Profile Types To create a Single User Dial in follow the steps under Dial in Wizard for Single User Dial in page 102 To create a LAN Modem Site to Site Dial in follow th...

Страница 103: ...al 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 the drop down list and then click Next ...

Страница 104: ...igure 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 Password fields when you configure your client device 5 Click Next The Dial In Wizard Internet Service Provider Selection window appears ...

Страница 105: ...u 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 for dial out access to this LAN Modem refer to Part II Configuring a Client Device for Dial out Access page 109 Dial in Wizard for LAN Modem Site to Site Dial in To create a Dial in User Profile for ...

Страница 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 Wizard Password Window 4 Enter a unique Username and Password for the second site LAN Modem ...

Страница 107: ...In 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 different from the Site name designated in this local LAN Modem s Dial In Global Parameters In other words if you have already designated this LAN Modem as Site A you would designate the dial in profile y...

Страница 108: ...r 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 procedure that you used to configure this LAN Modem If you wish to use the LAN Modem s Callback feature you must configure Callback parameters for this LAN Modem from the Dial in User Parameters page R...

Страница 109: ...guration 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 device Configuring an Analog Modem for Dial out Calling page 109 Configuring a LAN Modem Using Single User Dial out Access page 110 Configuring a LAN Modem LAN Site to Site for Dial out Access page 11...

Страница 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 workstation has been restarted and has acquired an IP address belonging to the new LAN Modem subnet 3 Restart your workstation The default IP address for the local LAN Modem will have been changed to 192 16...

Страница 111: ...he 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 the server side LAN Modem If this is the first Site A LAN Modem in a LAN Site to Site setup and if you have not yet completed the Site B or Site C server side configuration then the Username and Passwo...

Страница 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 would be dialing 9 for use with a PBX If not required leave this field blank 5 In the Telephone Number 1 field enter the telephone number of the server side LAN Modem ...

Страница 113: ...be 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 parameters if you want to use this feature Otherwise leave the defaults Enable Callback Choose to enable or disable Callback By default Callback is disabled Callback Delay Leave the default setting which is...

Страница 114: ...ting 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 to Yes the LAN Modem first attempts to deliver the unsolicited TCP UDP packets to the workstation that is currently communicating with the remote host that has generated these packets Only if no such ...

Страница 115: ...15 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 Parameters screen opens as shown in Figure 68 ...

Страница 116: ...log 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 being configured as both a server side and client side device for peer to peer networking Choose Advanced if this user will be accessing the LAN Modem from a router other than a LAN Modem This scena...

Страница 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 Callback Delay field enter the amount of time in seconds to wait until the dial in user is called back By default this is set to 10 WAN Parameters If you used the Dial in Wizard to create this Dial in...

Страница 118: ...2 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 Note that this option assumes that you have configured a Private Network as your service provider and not an ISP Once connected you can use all LAN resources available on the server end of the connect...

Страница 119: ...N 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 LAN Modem is necessary In addition to the CD ROM the application may be downloaded directly from the LAN Modem Utilities website http www 3com com support docs lanmodem util html Placing Calls In addit...

Страница 120: ...ce 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 the LAN Modem s Manual Call Control window instead of having the LAN Modem to do this automatically When you place a call manually you can either select one of your pre configured service providers a...

Страница 121: ...ion 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 Participate in Existing Call from the Manual Call Control page Note that if multiple parties share the connection established as a TempSvcProvider the call can be disconnected only by the workstation tha...

Страница 122: ...ing 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 disconnect calls manually follow these steps 1 From the Main Configuration Page click the Manual Calling button The Manual Call Control window appears 2 In the table locate the name of the service provider fr...

Страница 123: ...The 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 seconds after which a call should be disconnected due to inactivity This timer is initiated once the minimum call duration is satisfied and no further activity is detected To prevent a data call fro...

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

Страница 125: ...ng 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 Before you monitor the LEDs or refer to the symptoms and solutions section check the following Verify that the cables are not physically damaged If damage is apparent replace the cable Verify that the ...

Страница 126: ...s 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 LED does not light up in Table 6 below The Ethernet cable may not be properly connected or the cable may be the wrong polarity Evaluating Symptoms and Solutions Table 6 lists symptoms of common problem...

Страница 127: ...oose 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 the box labeled Direct Connection to the Internet There is a configuration problem Reset the Dual 56K LAN Modem to the factory default setting Refer to Resetting the Dual 56K LAN Modem in this chapte...

Страница 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 installation Alert LED continues to flash Self test failure or LAN Modem is in firmware download mode Power cycle the Dual 56K LAN Modem If the Alert LED continues to flash the LAN Modem has failed the self ...

Страница 129: ...pplication 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 set to 0 Check the timeout values configured for the LAN Modem as explained in Changing Data Call Parameters Chapter 7 Using the Manual Calling page drop the call wait for the spurious call to be re ...

Страница 130: ...is 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 needs increase Only one telephone line connected to the LAN Modem Service Provider s Bandwidth Allocation is not configured to Add Second Channel as Needed Change the Connect Disconnect threshold for...

Страница 131: ...follow 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 Resetting the Dual 56K LAN Modem to the Factory Defaults If you are unable to access the LAN Modem Main Configuration Home Page because your computer cannot communicate with the LAN Modem you can res...

Страница 132: ...derstanding 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 LAN Modem Serial Number Displays the serial number of the Dual 56K LAN Modem Ethernet Address Displays the Ethernet address of the Dual 56K LAN Modem System software version number Displays the firmwar...

Страница 133: ...egan 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 the length of time in minutes and seconds that this current call has been idle Number of octets received Indicates the number of octets bytes received by the Dual 56K LAN Modem Number of octets transmi...

Страница 134: ...t 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 10 Calls Information Description Call Type Indicates whether the last 10 calls were incoming or outgoing Service Provider Indicates the destination to which the last 10 calls were connected Duration...

Страница 135: ...te 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 scroll down to see it The LAN Modem synchronizes its clock to match the date and time on your workstation The Set Password page opens 4 Enter your password and click Submit ...

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

Страница 137: ...ers 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 wiring or any pre existing public network infrastructures such as the Internet A network as a whole can extend beyond the limits of any one LAN and can comprise limitless numbers of LANs but where i...

Страница 138: ...s 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 from the WAN Since different WAN services use different physical media and different technologies for transporting data for example cable is different from analog which is different from ISDN a WAN ...

Страница 139: ...ce 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 bit value an IP address which uniquely identifies each location within the network See also IP Address below While IP provides rules for routing data the reliability of the data s delivery to its de...

Страница 140: ...e 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 pinpoint a host s exact location This has significance for the use of subnet masks which are explained below All this might be analogous to the idea that in a first round of mail sorting for efficiency...

Страница 141: ...thin 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 the original network number such that a new longer network number is temporarily derived The mechanism of a subnet mask is analogous to a colored lens used in an optician s test to blot out one half o...

Страница 142: ...ddress 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 of hosts Subnetting became a way to allow for the latter and subnet masks were devised as a way of accomplishing this within the existing framework using already assigned IP addresses Since Internet...

Страница 143: ...tion 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 NAT allows multiple users attached to the second LAN Modem to appear as a single user to the first LAN Modem In terms of communication between the workstations on either LAN the use of NAT means tha...

Страница 144: ...pose 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 protocol in use today What is Data Compression Data compression is a method of reducing the amount of bandwidth required when transmitting a file over a network This is accomplished by condensing any duplic...

Страница 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 service provider in your area or for a more detailed explanation of 56K technology visit 3Com s 56K Web page at http www 3com com 56k What is a VPN tunnel A VPN tunnel is a private secure means by which ...

Страница 146: ...146 APPENDIX A NETWORKING PRIMER ...

Страница 147: ...alling 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 Driver on each workstation Configuring the LAN Modem for use with the Virtual Fax Modem Installing the Virtual Fax Modem Application To install the Virtual Fax Modem application follow these steps 1 From ...

Страница 148: ...0 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 install In this case choose Other and then click Next 3 Click Don t detect my modem I will select it from a list and then click Next 4 Select 3Com Corp from the Manufacturer s list on the left 5 Select OC...

Страница 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 Enabled Time Limit This field is used to set the maximum time available for a Virtual Fax Modem connection Once this time limit has been reached the connection will be automatically dropped Note that ...

Страница 150: ...upports 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 2 0 note that Class 2 and Class 2 0 are not the same An example of a fax application that supports Class 2 0 fax communications is provided on the 3Com Companion Programs CD ROM or downloaded direct...

Страница 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 0 or later with Service Pack 3 or greater and RAS Remote Access Service installed or 3Com s NETBuilder PathBuilder or Total Control Hub Installed any networking protocols required for the private net...

Страница 152: ...n 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 Companion Programs CD ROM Refer to your Windows user documentation for installation details Create a RAS NT or Dial Up Networking 95 98 2000 phone book entry for the Virtual Private Network You will nee...

Страница 153: ...ual 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 Data Call Timeout Values Minimum Call Duration 2 minutes Automatic Data Call Inactivity Disconnect 7 minutes Manual Data Call Inactivity Disconnect 15 minutes Receiving Call Parameters Auto Answer Disab...

Страница 154: ...154 APPENDIX D FACTORY DEFAULTS ...

Страница 155: ...the 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 Connectors RJ 11 LAN Interface Ethernet IEEE 802 3 10BASE T standard Physical Dimensions Depth 7 3 in 185 4 mm Width 8 7 in 220 mm Height 2 15 in 54 6 mm Weight 2 2 lbs 1000 g Environmental Operating R...

Страница 156: ...156 APPENDIX E SPECIFICATIONS ...

Страница 157: ...or 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 makes use of distributed intelligence by exploiting the processing power of all attached computers on the network A client device is usually a personal computer often termed workstation in this context a...

Страница 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 can be plugged in order allow these devices to communicate with one another as a local area network LAN ITU International Telecommunications Union Headquartered in Geneva Switzerland the ITU is an inte...

Страница 159: ...rding 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 their ability to make decisions about the most efficient route through which to send each packet A router often serves as the link between a LAN and WAN Service Provider As used by the Dual 56K LAN M...

Страница 160: ...ed 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 A virtual private network is a secure private data network that is established over the Internet resulting in cost savings by using local toll free access numbers Also because the existing Internet b...

Страница 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 SOFTWARE THE USE OF WHICH IS GOVERNED BY A SEPARATE END USER LICENSE AGREEMENT THIS 3COM WARRANTY DOES NOT APPLY TO SUCH THIRD PARTY SOFTWARE FOR THE APPLICABLE WARRANTY PLEASE REFER TO THE END USER LICE...

Страница 162: ...SCLOSE 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 OPEN REPAIR OR MODIFY THE PRODUCT OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE OR BY ACCIDENT FIRE LIGHTNING POWER CUTS OR OUTAGES OTHER HAZARDS OR ACTS OF GOD LIMITATION OF LIABILITY TO THE...

Страница 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 ringing when connected to a standard phone socket This equipment shall not be set up to make automatic calls to the Telecom 111 Emergency Services The grant of a Telepermit for a device in no way indicat...

Страница 164: ...k This booklet is available from the U S Government Printing Office Washington D C 20402 Stock No 004 000 00345 4 NOTE In order to maintain compliance with the limits of a Class B digital device 3Com requires that you use quality interface cables when connecting to this device Changes or modifications not expressly approved by 3Com could void the user s authority to operate this equipment Refer to...

Страница 165: ...oss 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 device is capable of providing users access to interstate providers of operator services through the use of equal access codes This registered device provides proper answer supervision to the PSTN whe...

Страница 166: ......

Страница 167: ...address 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 local DNS table configuring 88 locking the configuration 90 M manual call to a temporary service provider 121 Modem Controls changing 83 understanding 83 Multilink PPP configuration options 27 multi...

Страница 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 warranty 20 161 Web site LAN Modem Support 52 WebWizard 53 WINS server specifying 87 ...

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