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10
TROUBLESHOOTING AND
M
AINTENANCE
This chapter explains how to isolate and solve problems encountered with the
Dual 56K LAN Modem, such as problems caused by incorrect settings or improper
installation. Basic maintenance information for the Dual 56K LAN Modem is also
provided.
The following main topics are covered in this chapter:
■ Checking the basics
■ Monitoring the LEDs
■ Evaluating symptoms and solutions
■ Finding more information
■ Contacting technical support
■ Downloading firmware
■ Resetting the LAN Modem
■ Reviewing 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 power cord is connected to the LAN Modem and an electrical
outlet.
■ Verify that the analog telephone cables are properly connected to the LAN
Modem and their telephone wall outlets.
Monitoring LEDs If you are experiencing operational inconsistencies, you can monitor the Alert and
LAN Status LEDs to isolate problems.
- Dual 56K LAN Modem 1
- User Guide 1
- 3Com Corporation 2
- 5400 Bayfront Plaza 2
- Santa Clara, California 2
- 95052-8145 2
- MPORTANT 3
- NFORMATION 3
- Important Notice de 4
- Securite 4
- Medidas de Seguridad 4
- Importantes 4
- Informazioni 5
- Importanti per la 5
- Sicurezza 5
- Additional Safety 5
- Information 5
- GLOSSARY 10
- ABOUT THIS GUIDE 11
- BOUT THIS GUIDE 12
- INTRODUCTION 13
- 14 CHAPTER 1: INTRODUCTION 14
- Applications 15 15
- HAPTER 1: INTRODUCTION 16
- 18 CHAPTER 1: INTRODUCTION 18
- Features 19 19
- UAL 56K LAN MODEM 21
- UNCTIONALITY DESCRIPTION 21
- Wan Side: The Two 22
- 56K Modems 22
- Using the Modem 22
- Channels 22
- LAN StatusMODEM 2MO DEM 1 23
- .168.1.4 24
- Small Office LAN 25
- Telecommuter 25
- Second small 26
- Understanding 27
- Multilink PPP and 27
- Other Line Usage 27
- The Virtual FAX 28
- Modem (Windows 95 28
- 98, NT, and 2000) 28
- Support for Virtual 29
- Private Networks 29
- BEFORE YOU BEGIN 31
- HAPTER 3: BEFORE YOU BEGIN 32
- Figure 21 DHCP Message Box 37
- Setting Up Your 39
- Computer If You Have 39
- INSTALLING THE DUAL 56K LAN 43
- LINE 1 PHONE 1 44
- LINE 2 PHONE 2 44
- LAN StatusMODEM 2MODEM 1 45
- CONFIGURING THE DUAL 56K LAN 47
- FOR INTERNET ACCESS 47
- ■ ISP Telephone Number 48
- ■ ISP User ID and Password 48
- Typical Configuration 49 49
- Figure 33 ISP Wizard Window 51
- Changing the LAN 52
- Modem IP Address for 52
- Static IP Users 52
- The LAN Modem Main 53
- Configuration Page 53
- Connecting an 56
- External Hub to the 56
- OfficeConnect 57
- Ethernet Hub 8 57
- Ethernet cable 57
- FOR PRIVATE NETWORK 59
- Configuration Steps 61 61
- Configuration Steps 63 63
- Configuration Steps 65 65
- The LAN Modem 70
- Support Web Site 70
- ADVANCED CONFIGURATION 71
- Figure 44 72
- Using a Connection 77
- Configuring LAN 81
- Parameters 81
- Configuring V.90 83
- Modem Control 83
- Changing Data Call 85
- Specifying a WINS 87
- Server Address 87
- Configuring the Local 88
- DNS Table 88
- Reserving DHCP 89
- Addresses 89
- Changing Your 89
- Password 89
- Locking and Unlocking 90
- Using Selective 91
- Password Protection 91
- Configuring the LAN 91
- Modem from a 91
- Remote Location 91
- Checking for Dual 56K 94
- LAN Modem upgrades 94
- FOR DIAL-IN SUPPORT 95
- Understanding the 96
- Three Dial-in Profile 96
- 2.168.2.2 97
- Part I. Configuring the 99
- Server-side Dual 56K 99
- LAN Modem for 99
- Dial-in Support 99
- Dial-in Wizard for Single 102
- User Dial-in 102
- Dial-in Wizard for LAN 105
- Modem Site-to-Site Dial-in 105
- Dial-in Wizard for Advanced 108
- Client Device for 109
- Dial-out Access 109
- Part II. Configuring a 109
- Creating a Private Network 111
- Service Provider Profile 111
- Configuring Dial-in 114
- User Parameters 114
- Placing a Call from a 118
- Client-side LAN 118
- PLACING, RECEIVING AND 119
- Receiving Calls 121 121
- Disconnecting Calls 123 123
- TROUBLESHOOTING AND 125
- Evaluating Symptoms 126
- Finding More Information 131 131
- Synchronizing the 134
- LAN Modem Clock 134
- NETWORKING PRIMER 137
- PPENDIX A: NETWORKING PRIMER 138
- More Connected 138
- What is a network? 139 139
- Figure 70 Subnet Masking 141
- What is a network? 143 143
- What is a network? 145 145
- Installing the Virtual 147
- FAX Modem 147
- CREATING A VIRTUAL PRIVATE 151
- (VPN) TUNNEL 151
- FACTORY DEFAULTS 153
- PPENDIX D: FACTORY DEFAULTS 154
- SPECIFICATIONS 155
- PPENDIX E: SPECIFICATIONS 156
- 158 GLOSSARY 158
- LOSSARY 159 159
- 160 GLOSSARY 160
- IMITED LIFETIME WARRANTY 161
- ■ Equipment Jack: CA-11A 163
- ECLARATION OF 164
- ONFORMITY 164
- ART 68 COMPLIANCE 165
- TATEMENT 165
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