3Com 3C886 Evaluating Symptoms and Solutions

86 CHAPTER 8: TROUBLESHOOTING AND MAINTENANCE

■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 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 <will be supplied by

server>. Select File and then Close 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.

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