3Com Dual 56K manual Evaluating Symptoms, Solutions, Symptom Possible Cause Solution

126CHAPTER 10: TROUBLESHOOTING AND MAINTENANCE

Monitoring the Alert Power cycle the Dual 56K LAN Modem and observe the Alert LED. During the LED power-up self-test, the Alert LED will remain lit.

■If the Alert LED goes off, the test has been successful.

■If the Alert LED flashes for more than several seconds, it means the LAN Modem is either in firmware download mode or there is an internal failure. If the LAN Modem is not in firmware download mode, notify your reseller that the Dual 56K LAN Modem has failed the self-test and order a replacement.

■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 “During installation, Alert LED continues to flash” in Table 6 below for more information.

Monitoring the LAN Observe the LAN Status LEDs labeled 1, 2, 3, or 4, depending on the port to which Status LEDs a workstation is attached. If the LAN Status LED is lit for the correct port, it means

that the LAN Modem detects the Ethernet link signal and operation is normal. When the computer attached to this port is transmitting data to the LAN, this 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	Table 6 lists symptoms of common problems, possible causes, and possible
and Solutions	solutions.
Table 6 Symptoms, Causes, and Solutions
Symptom	Possible Cause	Solution

During installation, LAN Status	Ethernet cable is not securely
LED does not light up	connected.

Check the Ethernet cable connection. Make sure it is inserted properly in LAN port 1,2,3, or 4 on the back of the Dual 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 setup, launching	Your Web browser needs the IP	Enter the following URLs in your Web browser:
the Web browser does not	address of the Dual 56K LAN	http://192.168.1.1. Alternatively, you can enter
start the configuration process	Modem.	http://3com.oc.lanmodem.
(the welcome message does	Or, the browser is not set to a
not appear).
	default start page.
(continued)