Cisco Systems 520 Manual De Usuario

 lists problems that could occur the first time you turn on the router.

All LEDs, including 
SYS PWR LED, are 
off.

No power to router.

Perform the following tasks in the order given:

Check that the power switch is set to ON.

Check that all connections to and from the power supply are 
secure.

Check that the power outlet has power.

If the problem continues, the power supply could be faulty. 
Contact your Cisco reseller.

No connection to 
modem or to Ethernet 
switch. (WAN FE4 
LED is off.)

A cable-related problem:

Improperly connected 
cable.

Damaged cable.

Perform the following tasks in the order given:

Check that you have cabled the device correctly. Review the 
instructions in 

Check that the connectors at both ends of the cable are securely 
seated.

Check whether the cable is physically damaged. If it is damaged, 
order another cable from Cisco, or replace it with a similar cable.

No connection to 
Ethernet devices. 

(LAN—FE0, FE1, 
FE2, and FE3 are off.)

A cable-related problem:

Improperly connected 
cable.

Damaged cable.

Perform the following tasks in the order given:

Check that you have cabled the device correctly. See 

Check that the connectors at both ends of the cable are securely 
seated.

Check whether the cable is physically damaged. If it is damaged, 
order another cable from Cisco Systems, or replace it with a 
similar cable.

Cannot connect to the 
Internet.

Broadband modem or 
external Ethernet switch 
is not connected or 
turned on.

There is a problem with 
the broadband or WAN 
service.

Router is improperly 
configured.

Reconnect the broadband modem or external Ethernet switch, and 
make sure that it is receiving power.

Check with the Internet service provider or corporate network 
administrator to determine whether there is a problem.

Configure the router by using a PC that is connected to the 
console port.