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3Com 3C886 User Guide - Page 86

Monitoring the LAN Port Status LEDs, Evaluating Symptoms and Solutions, Monitoring the LAN Port

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86 CHAPTER 8: TROUBLESHOOTING AND MAINTENANCE s A fast flash of the ALERT LED indicates that the DHCP server has issued all of the available IP addresses, and is unable to fulfill a request for a new IP address. Refer to "ALERT LED continues to flash" for more information. Monitoring the LAN Port Status LEDs Observe the LAN port status LED labeled 1, 2, 3, or 4, depending on the port number to which your computer is attached. If the LED port status is lit, the 56K LAN Modem detects the Ethernet link signal and operation is normal. When the computer attached to that port is transmitting data to the LAN, this LED flashes. If the port status LED is Off, the 56K LAN Modem does not detect the Ethernet link integrity signal. Refer to the "Evaluating Symptoms and Solutions" section. The Ethernet cable may not be properly connected or the cable may be the wrong polarity. Evaluating Symptoms Table 8 lists symptoms of common problems, possible causes, and possible and Solutions solutions. Table 8 Symptoms, Causes, and Solutions Symptom Possible Cause Solution LAN port status LED is off (that Ethernet cable is not securely is, not illuminated) connected. 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. Ethernet card is not set up properly. Make sure your Ethernet card is set up properly (for example, proper drivers are loaded). Refer to the documentation provided with your Ethernet card for instructions. Upon initial set up, communication between the 56K LAN Modem and an attached computer cannot be established Incompatible IP address on your computer Reset the IP address on your computer. For Windows 95 and 98 users, run Winipcfg.exe. Select the Ethernet adapter connected to the 56K LAN Modem. Click Release All and then click Renew All. For Windows NT 4.0 users, run ipconfig /release and then ipconfig /renew. For Mac users, from the Apple menu, select Control Panels and then select TCP/IP. Make sure Ethernet is selected in the Connect via field. From the Configure field, select Using BootP Server to clear the fields, then close and save changes to the Control panel. Open the TCP/IP control panel and select Using DHCP Server. The fields should now read . Select File and then Close and save changes when prompted. Your Web browser needs the IP Enter the following URL in your Web browser: address of the 56K LAN Modem. http://192.168.1.1/. Alternatively, you can enter http://3Com.oc.lanmodem. (continued)

Section	Page
Important Safety Information	3
Additional Safety Information	3
Table of Contents	5
About This Guide	11
Introduction	11
How to Use ThisGuide	11
Conventions	11
Year 2000 Compliance	12
Introduction	13
Introduction	13
56K Access	13
Applications	13
Local Networking with Access to the Internet	14
Local 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
Error Control and Data Compression	16
Modulation Schemes	16
Security	16
Upgradability	16
Diagnostics	16
Warranty	17
Support for Internet Applications	17
56K LAN Modem Functionality Description	19
Connection Types	19
56K Technology	19
LAN Side Connection	19
Application Sharing over the LAN	20
WAN Connection	21
One High Speed Connection	21
Sharing the Connection	21
Call Routing Protocol and IP Address Translation	22
Placing a Call to a Previously Defined Destination	22
Call Routing While No Other Calls are Connected	22
Understanding VPNs and PPTP	23
Setting Up the Server Side of the Tunnel	24
Setting Up the Client Side of the Tunnel	24
For Windows Dial-Up Networking Users	24
Establishing a Tunnel via the LAN Modem	24
Hardware Description and Installation	27
Package Contents	27
Before You Install the 56K LAN Modem	27
Front Panel LED Description	28
Back Panel Connector Description	29
Installing the 56K LAN Modem	29
Before You Begin	29
Installing the Analog Cable	30
Connecting 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
Setting Up TCP/IP for Windows and Macintosh	35
TCP/IP Setup Using Windows 95 and 98	35
TCP/IP Setup Using Windows NT 4.0	38
TCP/IP Setup Using Mac OS 7.6 or later	41
TCP/IP Setup Using Windows 3.11	42
Setting up TCP/IP using MS_TCP	42
Configuring the 56K LAN Modem	45
Typical Configuration	45
Before You Begin	45
You Should Have This Information	46
Determine Whether You Use Dynamic or Static IP Addresses	46
Setting Up Your Computer If You Have a Static IP Address	47
For Windows 98 and 95 Users	47
For Windows NT 4.0 Users	47
For Macintosh Users	48
For Windows 3.11 Users	48
Configuring the 56K LAN Modem for the Typical Configuration	49
Configuring a Static IP Address on the 56K LAN Modem	52
Configure Additional Parameters	53
56K LAN Modem Main Page	54
Links From the Illustration	54
Links from the Buttons	55
Advanced Configuration	57
Advanced Configuration	57
Setting Up Additional Service Providers	57
ISP Versus Private Network	58
When to Select ISP	58
When to Select Private Network	58
Setting Up a Connection to an ISP	58
Before You Begin	58
Setting Up a Connection to the Internet	59
Setting Up a Connection to a Private Network	62
Before You Begin	62
Setting Up a Connection to a Remote LAN	62
Associating Service Providers with Computers on the LAN	65
Editing Service Provider Profiles	66
Restricting Access to Service Providers	66
Configuring LAN Parameters	67
Understanding LAN Parameters	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 Modem Controls	69
Connection Controls	69
Mode Controls	69
Protocol Controls	69
Changing Modem Controls	70
Changing Data Call Parameters	71
Understanding Data Call Parameters	71
Minimum Call Duration	71
Disconnecting an Automatic Data Call	71
Disconnecting a Manual Data Call	72
Number of Times to Redial for a Manual Call	72
Delay Between Redial Attempts When Placing a Manual Call	72
Configuring the Data Call Parameters	72
Selective Password Protection	72
Changing Your Password	73
What If I Forget My Password?	73
Locking and Unlocking the Configuration	73
Configuring the LAN Modem from a Remote Location	74
Configuring the LAN Modem Remotely via Another LAN Modem	74
Configuring the LAN Modem Remotely via an Analog Modem	74
Placing, Receiving and Disconnecting Calls	77
Placing Calls	77
Placing a Call Automatically	77
Call Routing Among Service Providers	77
Placing a Call Manually	78
Placing a Call Manually to a Temporary Service Provider	78
Receiving Calls	79
Receiving Voice Calls	79
Receiving Data Calls	79
Auto Answer	79
Disconnecting Calls	80
Disconnecting Calls Manually	80
Disconnecting Calls Automatically Using Timers	80
Minimum Call Duration	80
Idle Timeout	80
Using a Connection Script	80
Before You Begin	80
Accessing the Script Configuration Page	81
Creating a Connection Script	82
Connection Script Command Syntax	82
Using the Configuration Buttons	82
Additional Configuration Buttons	84
Troubleshooting and Maintenance	85
Checking the Basics	85
Monitoring LEDs	85
Monitoring the ALERT LED	85
Monitoring the LAN Port Status LEDs	86
Evaluating Symptoms and Solutions	86
Finding More Information	90
Contacting Technical Support	90
Downloading Firmware to Your 56K LAN Modem	90
Resetting the 56K LAN Modem to a Factory Default Setting	90
Resetting the 56K LAN Modem to the Factory Defaults	90
Reviewing Statistics	91
Understanding System Statistics	91
Understanding Current Call Information	91
Understanding Last Call Information	92
Understanding Service Provider Information	93
Networking Primer	95
What is a network?	95
What is a LAN?	95
What is a WAN?	95
How does a LAN connect to a WAN?	96
What is a LAN Modem?	96
What is a POTS connection?	96
How do different devices communicate with each other?	96
What is TCP/IP?	96
What is an IP Address?	96
What is a Subnet Mask?	97
Dynamic and Static IP Addresses	97
What is DHCP?	97
What is DNS?	97
What is NAT?	98
What are numbered and unnumbered links?	98
How is overall throughput determined?	98
What is a modem?	98
What is the difference between analog and digital signals?	98
What is error correction?	98
What is Data Compression?	98
How does 56K technology work?	99
Possible Limitations	99
Using the Custom Web Browser	101
Custom Links	101
Using Favorites	102
Installing the Custom Internet Explorer Browser	102
Installing Future Releases of Internet Explorer	102
Factory Defaults	103
56K LAN Modem Factory Defaults	103
Specifications	105
General Specifications	105
Year 2000 Compliance	105
Glossary	107
3Com Corporation Limited Warranty	113
FCC Class B Statement	114

Match case Limit results 1 per page

HAPTER

8: T

ROUBLESHOOTING

AND

AINTENANCE

■

A fast flash of the ALERT LED indicates that the DHCP server has issued all of

the available IP addresses, and is unable to fulfill a request for a new IP address.

Refer to “ALERT LED continues to flash” for more information.

Monitoring the LAN Port

Status LEDs

Observe the LAN port status LED labeled 1, 2, 3, or 4, depending on the port

number to which your computer is attached. If the LED port status is lit, the 56K

LAN Modem detects the Ethernet link signal and operation is normal. When the

computer attached to that port is transmitting data to the LAN, this LED flashes.

If the port status LED is Off, the 56K LAN Modem does not detect the Ethernet

link integrity signal. Refer to the “Evaluating Symptoms and Solutions” section.

The Ethernet cable may not be properly connected or the cable may be the wrong

polarity.

Evaluating Symptoms

and Solutions

Table 8 lists symptoms of common problems, possible causes, and possible

solutions.

Table 8

Symptoms, Causes, and Solutions

Symptom

Possible Cause

Solution

LAN port status LED is off (that

is, not illuminated)

Ethernet cable is not securely

connected.

Ethernet card is not set up

properly.

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 sure your Ethernet card is set up properly (for

example, proper drivers are loaded). Refer to the

documentation provided with your Ethernet card for

instructions.

Upon initial set up,

communication between the

56K LAN Modem and an

attached computer cannot be

established

Incompatible IP address on your

computer

Reset the IP address on your computer.

For Windows 95 and 98 users, run Winipcfg.exe. Select

the Ethernet adapter connected to the 56K LAN

Modem. Click

Release All

and then click

Renew All

For Windows NT 4.0 users, run

ipconfig /release

and

then

ipconfig /renew

For Mac users, from the Apple menu, select

Control

Panels

and then select

TCP/IP

. Make sure

Ethernet

selected in the Connect via field. From the Configure

field, select

Using BootP Server

to clear the fields, then

close and save changes to the Control panel. Open the

TCP/IP control panel and select

Using

DHCP Server

. The

fields should now read

<will be supplied by

server>

. Select

File

and then

and save changes

when prompted.

Your Web browser needs the IP

address of the 56K LAN Modem.

Enter the following URL in your Web browser:

http://192.168.1.1/

. Alternatively, you can enter

http://3Com.oc.lanmodem

(continued)