Cisco 2524 - Router - EN User manual

APPENDIX

Troubleshooting the Cisco 2524 and Cisco 2525 Routers B-1

Troubleshooting the Cisco 2524

and Cisco 2525 Routers

This appendix describes how to troubleshoot the Cisco 2524 and Cisco 2525 routers by

referring to the LEDs on the rear panel of the chassis (see Figure 1-2 and Figure 1-3) and

on the network processor modules (see Figure 1-4 through Figure 1-9).

The LEDs indicate the current operating condition of your router. You can observe the

LEDs, note any fault condition that the router is encountering, and then contact your system

administrator or a customer service representative, if necessary. Table B-1 describes the

LEDs on the router chassis and WAN modules.

Table B-1 LEDs

Chassis/Module LED State Description

Router chassis Power On steadily Power is being supplied to the router.

Off Power is not reaching the router. Verify that the power

supply is plugged into the wall receptacle, and that the

cable from the power supply to the router is connected.

Activity

(Ethernet/

Token Ring1)

Flickering The Ethernet/Token Ring LAN connection is

transmitting and receiving data normally.

Off The Ethernet/Token Ring LAN connection is not

transmitting or receiving data. Check the

Ethernet/Token Ring cable connection.

B-2 Cisco 2524 and Cisco 2525 Router User Guide

Router chassis Ethernet link

(Cisco 2524)2

On The router senses the Ethernet 10BaseT link integrity

signal, indicating normal operation.

Off The router is not sensing the Ethernet 10BaseT link

integrity signal. Check the Ethernet 10BaseT cable

connection.

In-ring

(Cisco 2525)

On The router has been successfully inserted into the

Token Ring, indicating normal operation.

Off The router has not been successfully inserted into the

Token Ring. Check the Token Ring cable connection.

2-wire switched 56-kbps,

4-wire 56/64-kbps, and

factional T1/T1 WAN

DSU/CSU modules

RX On Data is being received at the DTE interface.

TX On Data is transmitting from the DTE interface.

CD (Carrier) On The DSU/CSU in the module is communicating with

another DSU/CSU.

Loopback On The DSU/CSU is in loopback mode.

Alarm On An alarm condition is present.

Serial module Activity (serial

activity)

Flickering The serial WAN connection is transmitting and

receiving data normally.

Off The serial WAN connection is not transmitting or

receiving data. Check the serial cable connection.

ISDN BRI module Activity (ISDN

BRI activity)

Flickering The ISDN BRI WAN connection is transmitting and

receiving data normally.

Off The ISDN BRI WAN connection is not transmitting or

receiving data. Check the BRI cable connection.

ISDN BRI with integrated

NT1 module

ACT (ISDN

BRI activity)

Flickering The ISDN BRI (with integrated NT1) WAN

connection is transmitting and receiving data

normally.

NT1 On The router detects the ISDN link integrity signal at the

U interface3and the internal S/T interface4, indicating

that an ISDN connection has been established.

Chassis/Module LED State Description

Troubleshooting the Cisco 2524 and Cisco 2525 Routers B-3

Running Diagnostic Tests

If you have the fractional T1/T1 module, you can use external test equipment with the

monitor jack labeled OUT to monitor signals coming into the RJ-48C port, without

interrupting normal data transmission. You can use the monitor jack labeled IN to inject

data, which would interrupt normal data transmission.

Getting Help

For information on technical support, onsite service, and exchange and repair services, refer

to the Cisco Information Packet publication that shipped with your router.

ISDN BRI with integrated

NT1 module

Blinking

once per

second

The ISDN connection at the U interface is up, and the

internal S/T interface is coming up. If this state

persists, the ISDN port is either not configured or it is

configured incorrectly.

Blinking

eight times

per second

The ISDN connection at the U interface is coming up.

Off The router is not detecting the ISDN link integrity

signal. An ISDN connection has not been established.

Check the BRI cable connection.

1. The Token Ring activity LED is labelled ACT.

2. The Ethernet link LED is for the Ethernet 10BaseT port only; it does not work with the Ethernet AUI port.

3. The U interface is from the wall jack (telco interface) to the NT1 device.

4. The S/T interface is from the ISDN port on the module to the microprocessor.

Chassis/Module LED State Description

B-4 Cisco 2524 and Cisco 2525 Router User Guide

Getting Help

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