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Evaluating Symptoms and Solutions

89

Calls continue to reconnect or
calls do not timeout and
disconnect.

An application or LAN device is
sending IP packets.

Enable NetBIOS filtering. To do so, access the LAN
Parameters screen and click the box to enable
NetBIOS filtering. When this box is checked, NetBIOS
packets are prevented from initiating an outgoing call,
but they will be passed if the call is already
established. NetBIOS filtering is disabled by default.

Set the workgroup of all attached PCs to

WORKGROUP

in the Network control panel.

Or, turn off Microsoft’s print/file sharing or use
NetBEUI for local service (that is, within the LAN). To
turn off print/file sharing, from

Control Panel

select

Network

and then the

Configuration

tab. Click the

File

and Print Sharing

button. Clear both check boxes and

then click

OK

.

Make sure that the timeout value is not set to “0”.
Check the timeouts configured for the 56K LAN
Modem as explained in “Changing Data Call
Parameters” in Chapter 5.

Drop the call via the Manual Calling screen, wait for
the spurious call to be re-connected, and check the

Current Call Information

from the Statistics page for

the

Reason for call coming up

.

If the situation persists, disconnect each attached
LAN device to locate the source of the IP packet
generation.

Or you can turn off Automatic Call Initiation, located
on each service provider parameter page.

Some application software
does not work properly

The application may have an
embedded IP address, which
causes a problem when NAT is
enabled on the LAN Modem.

If you have a static network, disable NAT and try the
application again.

A complete list of applications tested for use with the
LAN Modem is located at

http://www.remoteaccess.3com.com/support/d
ocs/lanmodem/documentation/interop.html

Unable to connect at 56Kbps

56K may not be supported by
your remote server

In order to take advantage of 56K-based analog
connections, your remote server (such as an ISP) must
support 56K technology. To locate a 56K-enabled ISP
in your area, visit

http://www.3com.com/56K

.

FCC limitations

Current FCC rules restrict the power output of a Service
Provider’s modems, limiting download speeds to
53Kbps.

Poor line conditions

Check with your telephone company to ensure
maximum clarity exists for your telephone line.

(continued)

Table 8

Symptoms, Causes, and Solutions

Symptom

Possible Cause

Solution

«
...
87
88
89
90
91
...
»

Содержание OfficeConnect 3C8861

Страница 1: ...http www 3com com OfficeConnect 56K LAN Modem 3C886 User Guide Part No 984 000027 2 Published March 1999...

Страница 2: ...s as set forth in subparagraph c 1 ii for Restricted Rights in Technical Data and Computer Software Clause at 48 C F R 52 227 7013 3Com Corporation 5400 Bayfront Plaza Santa Clara California 95052 814...

Страница 3: ...manufactured by us are safe and without risk provided they are installed used and maintained in good working order in accordance with our instructions and recommendations If any of the following condi...

Страница 4: ...adequate air circulation Install the unit in a clean area that is free from dust or extreme temperatures Allow a clearance gap of at least a 6 inches 150 mm from the rear panel of the unit to allow fo...

Страница 5: ...al Networking with Access to a Remote Office 14 Features 15 Ease of Installation and Use 15 High Performance 15 Connectivity 15 Routing 15 Bandwidth Management 15 Remote Management 15 Protocols 16 Err...

Страница 6: ...ecting to a 10BASE T Ethernet Port 30 Connecting to Another Ethernet Hub 31 Before You Begin 31 Installing Analog Equipment 32 Installing the Power Cable 32 4 SETTING UP TCP IP FOR WINDOWS AND MACINTO...

Страница 7: ...67 Name 67 IP Address and Subnet Mask 67 Local Domain Name 68 Enable DHCP Server 68 Enable NetBIOS Filtering 68 Configuring the LAN Parameters 68 Configuring Modem Control Parameters 69 Understanding...

Страница 8: ...ng the Script Configuration Page 81 Creating a Connection Script 82 Connection Script Command Syntax 82 Using the Configuration Buttons 82 Additional Configuration Buttons 84 8 TROUBLESHOOTING AND MAI...

Страница 9: ...ER B USING THE CUSTOM WEB BROWSER C FACTORY DEFAULTS D SPECIFICATIONS General Specifications 105 Year 2000 Compliance 105 GLOSSARY 3COM CORPORATION LIMITED WARRANTY FCC CLASS B STATEMENT FCC DECLARATI...

Страница 10: ......

Страница 11: ...of the 56K LAN Modem s key functionality Chapter 2 A description of the 56K LAN Modem s hardware components Chapter 3 Instructions on setting up TCP IP Chapter 4 Instructions for basic configuration...

Страница 12: ...bbreviate 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 som...

Страница 13: ...to be the practical limit for speed over standard analog phone lines Now the V 90 56K ITU standard provides download speeds of up to 56K 1 And your 56K LAN Modem is software upgradable allowing easy...

Страница 14: ...ntinuing to network locally as shown in Figure 2 Figure 2 Local Networking with Access to a Remote Office LAN OfficeConnect 56K LAN modem Public telephone network Internet Intranet or online service A...

Страница 15: ...ing an external analog device Routing IP Routing Dynamic or static IP addresses supplied by your service provider WAN side Dynamic Host Configuration Protocol DHCP server functionality on the LAN whic...

Страница 16: ...CP RFC 1332 Network Address Translation NAT between LAN and WAN RFC 1631 Point to Point Tunneling Protocol PPTP Error Control and Data Compression ITU T V 42 ITU T V 42bis MNP 2 5 Modulation Schemes V...

Страница 17: ...our 56K LAN Modem supports applications that use the User Datagram Protocol UDP and the Transmission Control Protocol TCP This protocol is used primarily by Internet games Look for the latest list of...

Страница 18: ...18 CHAPTER 1 INTRODUCTION...

Страница 19: ...f the available 64K network bandwidth Upstream data typically less speed sensitive travels at the standard V 34 rate Further information is available in Appendix A of this User Guide or visit the 56K...

Страница 20: ...mple if only one computer has a Web browser other LAN users may share the browser for accessing the Internet Note that speed will likely be reduced when sharing applications Refer to your operating sy...

Страница 21: ...on If you desire you may also restrict access to certain users Note that speed may be affected with multiple users downloading simultaneously Figure 6 Shared Connection to a Remote Site Your 56K LAN M...

Страница 22: ...computer you simply launch your Web browser or whichever networking application you like When the 56K LAN Modem receives the information packet requesting access to the WAN it must determine which co...

Страница 23: ...PX and NetBEUI can be supported transparently through the tunnel While the LAN Modem supports PPTP it does not play an active role in creating or terminating a tunnel Figure 8 Connection to an Remote...

Страница 24: ...erating systems This software should reside on all workstations that wish to create a tunnel to the tunnel server Follow instructions provided for installation and set up For Windows Dial Up Networkin...

Страница 25: ...to have access to the remote private LAN will need to create its own tunnel Refer to http www remoteaccess 3com com support docs lanmodem for more information For specific instructions on how to confi...

Страница 26: ...26 CHAPTER 2 56K LAN MODEM FUNCTIONALITY DESCRIPTION...

Страница 27: ...tandards in Canada For a PC a 386 or higher processor is recommended and a 10BASE T Ethernet card is required For an Apple Macintosh computer system 7 6 or later operating system and Open Transport in...

Страница 28: ...the reset button Off indicates the unit has passed the diagnostic test and is working properly Flashes if one or more of the diagnostics have failed or after the unit is placed in firmware download mo...

Страница 29: ...ore You Begin Before you begin you will need the following in addition to the 56K LAN Modem RJ 11 6 pin to RJ 11 6 pin telephone cable which was provided in your modem package Coll Amber Ethernet Coll...

Страница 30: ...led Line on the 56K LAN Modem s back panel as shown in Figure 11 Figure 11 Analog Cable Connection 2 Connect the other end of the RJ 11 analog cable to a POTS analog wall jack Connecting to a 10BASE T...

Страница 31: ...n MDI X switch you must use a crossover cable 1 Insert one end of the 10BASE T Ethernet cable into one of the four LAN ports on the back of the LAN Modem as shown in Figure 13 Figure 13 10BASE T Hub t...

Страница 32: ...evice 1 Insert one end of an RJ 11 cable into the port labeled Phone on the back of the 56K LAN Modem as shown in Figure 14 Figure 14 Analog Equipment Connection 2 Insert the other end of the RJ 11 ca...

Страница 33: ...s the unit undergoes a power up self test diagnostic Once completed only the PWR LED and LAN port LED remain lit This completes the 56K LAN Modem installation If you do not have TCP IP installed and s...

Страница 34: ...34 CHAPTER 3 HARDWARE DESCRIPTION AND INSTALLATION...

Страница 35: ...the appropriate section TCP IP Setup Using Windows 95 and 98 TCP IP Setup Using Windows NT 4 0 TCP IP Setup Using Mac OS 7 6 or later TCP IP Setup Using Windows 3 11 TCP IP Setup Using Windows 95 and...

Страница 36: ...tocol and then click Add The Select Network Protocol dialog box appears Figure 18 Select Network Protocol Dialog Box 4 From the Manufacturers list box select Microsoft and then from the Network Protoc...

Страница 37: ...ddress Dialog Box 8 Most users should select Obtain an IP Address automatically as most LANs utilize dynamic IP addresses If this LAN uses static IP addressing enter the IP address and subnet mask You...

Страница 38: ...se the Network dialog box 13 Restart Windows 98 or 95 to let these changes take effect TCP IP Setup Using Windows NT 4 0 Windows NT 4 0 provides TCP IP as part of its standard operating system If you...

Страница 39: ...on Window 3 Click Add The Select Network Protocol window appears as shown in Figure 23 Figure 23 Select Network Protocol Window 4 Select TCP IP Protocol and then click OK The following message appears...

Страница 40: ...lick 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...

Страница 41: ...t mask 11 Click OK 12 Click Yes to restart your PC and allow the changes to take effect TCP IP Setup Using Mac OS 7 6 or later If you are using Macintosh operating system version 7 6 or later Open Tra...

Страница 42: ...y and then enter the IP address TCP IP Setup Using Windows 3 11 If you are using Windows 3 11 a TCP IP stack may not be provided as part of the operating system If you do not have a TCP IP stack you c...

Страница 43: ...lick OK 7 From the Install Driver dialog box enter the path to the MS _TCP directory For example if you installed MS_TCP on your C drive in a directory called MS_TCP you would enter C MS_TCP 8 Select...

Страница 44: ...44 CHAPTER 4 SETTING UP TCP IP FOR WINDOWS AND MACINTOSH...

Страница 45: ...puter Typical Configuration The typical configuration covers the following main steps Figure 31 Main Steps for Typical Configuration Before You Begin Before you configure the 56K LAN Modem you should...

Страница 46: ...ated with your 56K LAN Modem and then click Properties Select the IP Address tab If the radio button labeled Obtain an IP address automatically Windows 95 and 98 or Obtain an IP address from a DHCP se...

Страница 47: ...6K LAN Modem 3 Click Properties and then select the Gateway tab and write down the first IP address in the Installed Gateways list If nothing is entered in the Installed Gateway list enter an IP addre...

Страница 48: ...4 Enter this series of numbers into the Name Server Address box If you already have existing address es listed add the new address below the last entry 5 Choose File and Close 6 When asked to save yo...

Страница 49: ...hange its default IP address If this occurs the unit will reset itself and then function as described in this section Regardless of the start page to which your Web browser is set your Web browser wil...

Страница 50: ...ve the fields empty 4 Click Submit A message box indicates that your password has been set The ISP Wizard appears If you do not want to use the ISP Wizard click Abort to reach the 56K LAN Modem main c...

Страница 51: ...r field enter the telephone number of your ISP If you want to enter another telephone number to connect to your ISP refer to Editing Service Provider Profiles after you have completed this typical ins...

Страница 52: ...eturn to the LAN Modem s main configuration page enter the following address in your Web browser s address window http lanmodem Alternatively if you are using the Custom Browser clicking the Configure...

Страница 53: ...ISP connection From here you can read any new up to date information register your product or perform firmware upgrades as they become available If you have installed the Custom Browser from the 3Com...

Страница 54: ...ons listed in the left vertical frame as well as textual links from beneath the center graphic Links From the Illustration By clicking on the icons shown in the illustration you may jump to the follow...

Страница 55: ...Jumps to the Statistics page where you may view statistics such as system current call last call and service provider Maintenance Jumps to the Maintenance page Here you can reset the 56K LAN Modem as...

Страница 56: ...56 CHAPTER 5 CONFIGURING THE 56K LAN MODEM...

Страница 57: ...ssword Locking the configuration Disabling password protection for the Manual Calling screen Configuring the LAN Modem from a remote location Setting Up Additional Service Providers A service provider...

Страница 58: ...to a remote private LAN such as a corporate network For instance if you want to dial into your main office from home in order to access the servers at your office for email printing etc then select pr...

Страница 59: ...nnection to an ISP do the following 1 From the 56K LAN Modem main page click the Service Providers image Figure 36 ISP Service Provider Selection Window 2 Select New Internet Service Provider from the...

Страница 60: ...waiting Your telephone company should provide this value Note that your telephone will be busy to incoming calls when Call Waiting is disabled The Dial Out Prefix and the Call Waiting Disable values w...

Страница 61: ...ted unintentionally as a result of packets generated by your workstations 14 For Enable Intelligent NAT leave the default setting which is Yes in order for the LAN Modem to better support Internet app...

Страница 62: ...s a static IP address and subnet mask In addition you may need the following information depending on your particular network setup Check with your Network Administrator IP address subnet mask of the...

Страница 63: ...n 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 Call Waiting Disable Command field enter the appropriate command to disable...

Страница 64: ...SP for users on the LAN If the private network to which you connect has assigned a static IP address to each computer on your LAN then disable NAT 14 Under Miscellaneous if the private network to whic...

Страница 65: ...ice provider connections and a particular computer on the LAN do the following 1 From the 56K LAN Modem main page click the Workstations image The Workstation Selection window appears 2 From the Works...

Страница 66: ...file page appears 3 Edit the fields as desired For more information on the particular fields refer to the appropriate section Setting Up a Connection to an ISP or Setting Up a Connection to a Private...

Страница 67: ...name LANmodem is translated to the IP address 192 168 1 1 IP Address and Subnet Mask The IP address is a unique address which identifies the 56K LAN Modem on a network The default address 192 168 1 1...

Страница 68: ...d calls to your Service Provider resulting in subsequent charges to your phone bill When this box is checked NetBIOS packets are prevented from initiating an outgoing call but they will be passed if t...

Страница 69: ...m connects to a remote site The following options are provided Table 5 Connection Controls Mode Controls Mode Controls allow you to define your LAN Modem s operating conditions The following options a...

Страница 70: ...Service Provider page opens 3 Click the Modem Settings button located at the bottom of the Service Provider s page Note that each service provider up to four has its own associated Modem Settings pro...

Страница 71: ...ields Figure 42 Data Call Parameters Window Minimum Call Duration The minimum call duration is the minimum length of a call that must be satisfied before an inactivity timer can begin The default for...

Страница 72: ...Modem will redial a call that is placed using the Manual Call Control screen Acceptable values are between 0 and 255 times Delay Between Redial Attempts When Placing a Manual Call This field designate...

Страница 73: ...e WebWizard screen If this occurs you will be prompted to enter your password in order to gain access to the WebWizard What If I Forget My Password If you forget your password you must reset the 56K L...

Страница 74: ...were connected via your local LAN You are not able to browse the Internet when remotely accessing your LAN Modem During a remote configuration of the ISP Wizard clicking the Continue button will not p...

Страница 75: ...blank at this time 18 Click Connect Your local computer will dial and establish a connection with your remote LAN Modem 19 Once your call has been established launch a Web browser on your local comput...

Страница 76: ...76 CHAPTER 6 ADVANCED CONFIGURATION...

Страница 77: ...example should you have an ISP configured as one of your service providers opening a Web browser such as Netscape or Internet Explorer will cause the LAN Modem to automatically dial and connect to yo...

Страница 78: ...onfigured do the following Note that for this type of manual call the service provider must supply a dynamic IP address This call profile will remain under TempSvcProvider until you change the setting...

Страница 79: ...nabled for your LAN Modem to receive an incoming data call Note that Auto Answer is disabled by default Auto Answer The Auto Answer feature allows your LAN Modem to automatically answer an incoming ca...

Страница 80: ...er 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 f...

Страница 81: ...ng connection script and click Select If you are creating a new service provider choose New Internet Service Provider or New Private Network and click Select For instructions on creating or editing se...

Страница 82: ...age return is simulated by the characters M within the quotation marks The maximum length for this string is 64 characters The WaitFor command waitfor string second allows you to designate the text th...

Страница 83: ...word Login Click OK when finished 10 Enter the maximum number of seconds to wait for the remote server to send the connection request Click OK when finished 11 Click Transmit The Transmit dialog box...

Страница 84: ...vides 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 Parameters page The Reset but...

Страница 85: ...that the cables are not physically damaged If damage is apparent replace the cable Verify that the power cord is connected to the 56K LAN Modem and an electrical outlet Verify that the analog telepho...

Страница 86: ...perly Check the Ethernet cable connection and make sure it is inserted properly in a port labeled 1 2 3 or 4 on the back of the 56K LAN Modem and in the Ethernet port on the back of your computer Make...

Страница 87: ...browser If you are using Internet Explorer launch your Web browser Fromthe View menu select Internet Options Enter an address in the Home page address field such as http www 3com com If you are using...

Страница 88: ...ALERT LED is not flashing then the LAN Modem is now operating correctly ALERT LED continues to fast flash This may occur as a result of replacing a workstation on the LAN with a new computer The DHCP...

Страница 89: ...eck the Current Call Information from the Statistics page for the Reason for call coming up If the situation persists disconnect each attached LAN device to locate the source of the IP packet generati...

Страница 90: ...gs listed in Appendix C All user entered parameters are lost To reset the 56K LAN Modem do the following 1 From the 56K LAN Modem s home page select Maintenance 2 Select the type of reset you would li...

Страница 91: ...AN Modem System software version number Displays the firmware version of the 56K LAN Modem Boot software version number For internal use only The LAN Modem has been up for Displays the length of time...

Страница 92: ...son for call coming up Indicates how the call was placed and which workstation placed the call Depending on how the call placed you should see something similar to the following Manual Dial by Worksta...

Страница 93: ...ation Description Last Call Information Description Table 12 Service Provider information description Service Provider Information Description Number of successful connections Indicates the total numb...

Страница 94: ...94 CHAPTER 8 TROUBLESHOOTING AND MAINTENANCE...

Страница 95: ...d together using some type of cabling Typically Ethernet cabling is used There are three main types of Ethernet networks 10BASE T 10BASE 2 and 10BASE 5 The 56K LAN Modem supports up to ten 10BASE T co...

Страница 96: ...her Transmission Control Protocol Internet Protocol TCP IP is becoming the most common software used to accomplish this What is TCP IP TCP IP is a standardized communications protocol that works acros...

Страница 97: ...Because of the increasing popularity of the Internet the NIC is running out of permanent IP addresses It is therefore becoming more common to use dynamic IP addresses which are assigned temporarily an...

Страница 98: ...ay have speed limitations What is a modem The word modem is derived from the combination of two words modulator demodulator The main function of a modem is to convert the analog signal of the telephon...

Страница 99: ...on in the downstream path 56K technology can use nearly all of the available 64K network bandwidth Upstream data typically less sensitive travels at the standard V 34 rate of 33 6K Based on encoding r...

Страница 100: ...100 APPENDIX A NETWORKING PRIMER...

Страница 101: ...Links The following custom buttons provide direct links to 56K LAN Modem configuration and information Web sites Configure Modem Click here to jump to the 56K LAN Modem configuration main page Dial Ha...

Страница 102: ...net Explorer Browser If you already have a version of the Internet Explorer Web browser installed and you would like to install a later customized version you should first uninstall the previous versi...

Страница 103: ...ter during initial configuration If communication cannot be established initially the 56K LAN Modem will change its default IP address If this occurs the IP address will be different from the default...

Страница 104: ...104 APPENDIX C FACTORY DEFAULTS...

Страница 105: ...ompliance and 3Com products visit the 3Com Year 2000 web page http www 3com com products yr2000 html Table 14 56K LAN Modem Specifications Network Interface Analog POTS telephone service provided by t...

Страница 106: ...106 APPENDIX D SPECIFICATIONS...

Страница 107: ...lephone lines in a limited geographic area are connected to the public telephone network compression Compression is a method of reducing the size of data packets without losing any information If you...

Страница 108: ...ions that are the equivalent of manually lifting a phone receiver taking it off hook and replacing it going on hook PAP Password Authentication Protocol PAP is one of two PPP authentication protocols...

Страница 109: ...gy 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...

Страница 110: ...110 GLOSSARY...

Страница 111: ...ndows NT 86 ISP versus Private Network 58 L LAN parameters configuring 67 understanding 67 LEDs description 28 monitoring 85 locking the configuration 73 M Modem Controls changing 69 understanding 69...

Страница 112: ...112...

Страница 113: ...ing properly with regard to such date data on and after January 1 2000 provided that all other products used by Customer in connection or combination with the 3Com product including hardware software...

Страница 114: ...countries states or provinces do not allow the exclusion or limitation of implied warranties or the limitation of incidental or consequential damages for certain products supplied to consumers or the...

Страница 115: ...digital PBX party or coin telephone line If this device causes harm to the telephone network the telephone company will notify you in advance that temporary discontinuance of service may be required B...

Страница 116: ......

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