Apscincon - Cisco ONS 15327 User Documentation

Chapter 14 Alarm Troubleshooting
K1/K2 bytes also contain bits that tell the receiving equipment whether the K byte is valid. APSCIMP
occurs when these bits indicate a bad or invalid K byte. The alarm clears when the node receives valid
K bytes.
Always use the supplied electrostatic discharge (ESD) wristband when working with a powered ONS
Caution
15327. Plug the wristband cable into the ESD jack located on the lower-right outside edge of the shelf
assembly.
Procedure: Clear the APSC-IMP Alarm
To determine the validity of the K byte signal, examine the received signal. Use an optical test set capable
Step 1
of viewing SONET overhead.
If the K byte is invalid, the problem lies in upstream equipment and not in the reporting ONS 15327.
Step 2
Troubleshoot the appropriate upstream equipment.
If the K byte is valid, verify that each node has a ring ID that matches the other node ring IDs:
Step 3
a.
b.
c.
d.
If a node has a ring ID number that does not match the other nodes, change the ring ID number of that
Step 4
node to match the other nodes in the ring.
Click Apply.
Step 5

14.4.8 APSCINCON

•
An inconsistent automatic protection switching (APS) alarm (APSCINCON) is present. The SONET
overhead contains K1/K2 APS bytes that notify receiving equipment, such as the ONS 15327, to switch
the SONET 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 OC-N Card in a BLSR
Look for other alarms, especially LOS, loss of frame (LOF), or AIS. Clearing these alarms clears the
Step 1
APSCINCON alarm.
If an APSINCON alarm occurs with no other alarms, login to http://www.cisco.com/TAC for more
Step 2
information or call the Cisco Technical Assistance Center to report a service-affecting problem
(1-800-553-2447).
June 2002
Using CTC, login to a node on the ring.
Click the Provisioning > Ring tabs.
Record the ring ID number.
Repeat Steps a–c for all nodes in the ring.
Minor, Service-Affecting
Cisco ONS 15327 User Documentation, R3.3
Alarm Procedures
14-13