Cisco ONS 15454 SDH Specifications download pdf (Page 31)

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

May 2002

Chapter 1 Alarm Troubleshooting

Alarm Procedures

1.5 Alarm Procedures

This section lists alarms alphabetically. Each alarm or condition topic gives the severity, description and

troubleshooting procedure.

1.5.1 APSB

• Minor, Non-service affecting

The channel byte failure alarm occurs when line terminating equipment detects protection-switching

byte failure in the incoming automatic protection-switching (APS) signal. This happens when an

inconsistent APS byte or invalid code is detected. Some older, non-Cisco SDH nodes send invalid APS

codes if configured in a 1+1 protection scheme with newer SDH nodes, such as the ONS 15454 SDH.

These invalid codes will raise an APSB on an ONS node.

Procedure: Clear the APSB Alarm

Step 1 Examine the incoming SDH overhead with an optical test set to confirm inconsistent or invalid K bytes.

Step 2 If corrupted K bytes are confirmed and the upstream equipment is functioning properly, the upstream

equipment may not interoperate effectively with the ONS 15454 SDH. For ONS 15454 SDH protection

switching to operate properly, the upstream equipment may need to be replaced.

1.5.2 APSCDFLTK

• Minor, Non-service affecting

The default K byte received alarm occurs when an MS-SPRing is not properly configured. For example,

it occurs when a four-node MS-SPRing has one node configured as an SNCP ring. A node in an SNCP

or 1+1 configuration does not send the two valid K1/K2 APS bytes anticipated by a system configured

for MS-SPRing. One of the bytes sent is considered invalid by the MS-SPRing configuration. The K1/K2

byte is monitored by receiving equipment for link-recovery information. The alarm can also be caused

when a new node is added but a new ring map has not been accepted.

Warning

The ONS 15454 SDH is a Class I (CDRH) and Class 1M (IEC) laser system.

Warning

Invisible laser radiation may be emitted from the aperture ports of the single-mode fiber optic

modules when no cable is connected. Avoid exposure and do not stare into open apertures.

Procedure: Clear the APSCDFLTK Alarm

Step 1 Prior to accepting a new mapping table, verify that each node has a unique node ID number:

a. Log into a node on the ring.

b. Click the Provisioning > Ring tabs.

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Cisco ONS 15454 SDH Specifications Page 31