User manual
Table Of Contents
- Table of Contents
- About This Guide
- Introduction
- ISDN LAN Modem Functionality Description
- Hardware Description and Installation
- Setting Up TCP/IP for Windows and Macintosh
- Configuring the ISDN LAN Modem
- Advanced Configuration
- Before you Begin
- Setting Up Additional Service Providers
- Editing Service Provider Profiles
- Restricting Workstations from Accessing Service Provider(s)
- Configuring Your LAN Parameters
- Changing Data Call Parameters
- Changing Voice Call Routing
- Reserving DHCP Addresses
- Selective Password Protection
- Changing Your Password
- Setting Up Your ISDN Line Manually
- Locking and Unlocking the Configuration
- Configuring the ISDN LAN Modem from a Remote Location
- Supplementary Voice Call Services
- Placing, Receiving and Disconnecting Calls
- Troubleshooting and Maintenance
- Networking Primer
- What is a network?
- What is a LAN?
- What is a WAN?
- How does a LAN connect to a WAN?
- What is a LAN modem?
- What is ISDN?
- How do different devices communicate with each other?
- What is TCP/IP?
- What is an IP Address?
- What is a Subnet Mask?
- Dynamic and Static IP Addresses
- What is DHCP?
- What is DNS?
- What is NAT?
- What are numbered and unnumbered links?
- How is overall throughput determined?
- What is a network?
- Using the Custom Web Browser
- ISDN LAN Modem Factory Defaults
- ISDN LAN Modem Specifications
- Ordering ISDN Service
- If You Place Your ISDN Order Through 3Com
- If You Place Your ISDN Order Through the Telephone Company
- Supplementary Voice Features Included with U, EZ-ISDN-1, V and EZ-ISDN 1A
- Limitations of ISDN Ordering Codes U, EZ-ISDN 1, V and EZ-ISDN 1A
- What If I Already Have ISDN Service?
- Table of ISDN Ordering Code Capabilities
- Glossary
- Index
- 3Com Corporation Limited Warranty
9
T
ROUBLESHOOTING
AND
M
AINTENANCE
This chapter explains how to isolate and solve problems encountered with the
ISDN LAN Modem. Problems may stem from incorrect option settings or improper
installation.
This chapter covers the following main topics.
■ Checking the basics
■ Monitoring the LEDs
■ Evaluating symptoms and solutions
■ Finding more information
■ Contacting technical support
■ Downloading firmware
■ Resetting the ISDN LAN Modem
■ Reviewing statistics
CAUTION: There are no user-serviceable parts inside your ISDN LAN Modem.
Unauthorized opening of the unit will void the warranty.
Checking the Basics
Before you monitor the LEDs or refer to the section on symptoms and solutions,
check the following:
■ Verify that the cables are not physically damaged. If damage is apparent,
replace the cable.
■ Verify that you have a proper 10BASE-T Ethernet cable (8-pin to 8-pin)
■ Verify that the power cord is connected to the ISDN LAN Modem and an
electrical outlet.
■ Verify that the ISDN cable is properly connected to the ISDN LAN Modem
and the ISDN wall outlet.
The ISDN LAN Modem will not operate if connected to an analog telephone wall
jack. Make sure that the ISDN LAN Modem is connected directly into the ISDN wall
outlet without connection to any intermediate telephone equipment (an NT1
device is not required with the ISDN LAN Modem).