3com 3C886 Manuel D’Utilisation

C

HAPTER

 8: T

ROUBLESHOOTING

 

AND

 M

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.

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.

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

Table 8   Symptoms, Causes, and Solutions 

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: 

. Alternatively, you can enter 

.

(continued)