Cisco ONS 15454 SDH Specifikace stáhnout pdf (Strana 33)

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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3

May 2002

Chapter 1 Alarm Troubleshooting

Alarm Procedures

Procedure: Clear the APSC-IMP Alarm

Step 1 To determine the validity of the K byte signal, examine the received signal. Use an optical test set

capable of viewing SDH overhead.

Step 2 If the K byte is invalid, the problem lies in upstream equipment and not in the reporting

ONS 15454 SDH. Troubleshoot the appropriate upstream equipment.

Step 3 If the K byte is valid, verify that each node has a ring ID that matches the other node ring IDs:

a. Using CTC, log into a node on the ring.

b. Click the Provisioning > Ring tabs.

c. Record the ring ID number.

d. Repeat Steps a – c for all nodes in the ring.

Step 4 If a node has a ring ID number that does not match the other nodes, change the ring ID number of that

node to match the other nodes in the ring.

Step 5 Click Apply.

1.5.4 APSCINCON

• Minor, Service-affecting

An inconsistent APS code is present. The SDH overhead contains K1/K2 APS bytes that notify receiving

equipment, such as the ONS 15454 SDH, to switch the SDH signal from a working to a protect path. An

inconsistent APS code occurs when three consecutive frames do not contain identical APS bytes.

Inconsistent APS bytes give the receiving equipment conflicting commands about switching.

Procedure: Clear the APSCINCON Alarm on an STM-N Card in an MS-SPRing

Step 1 Look for other alarms, especially LOS, loss of frame (LOF) or AIS. Clearing these alarms clears the

APSCINCON alarm.

Step 2 If an APSINCON alarm occurs with no other alarms, login to http://www.cisco.com/tac for more

information or login to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a

directory of Cisco Technical Assistance Center toll-free numbers for your country.

1.5.5 APSCM

• Major, Service-affecting

The APS channel mismatch alarm occurs when the ONS 15454 SDH expects a working channel but

receives a protection channel. In many cases, the working and protection channels are crossed and the

protection channel is active. If the fibers are crossed and the working line is active, the alarm will not

occur. This alarm is raised in a 1+1 configuration. The APSCM alarm only occurs on the

ONS 15454 SDH when 1+1 bidirectional protection is used on STM-N cards in a 1+1 configuration.

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Cisco ONS 15454 SDH Specifikace Strana 33