Specifications

1-7
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 1 Alarm Troubleshooting
e. If two nodes have the same node ID number, change one node’s ID number so that each node has a
unique node ID.
f. Click Apply.
Step 2 Verify correct configuration of east port and west port optical fibers (see the “E-W-MISMATCH” section
on page 1-30).
Step 3 Click Yes to accept the Ring Map.
Step 4 If the alarm does not clear, check the ring map for each ONS 15454 in the network and verify that each
node is visible to the other nodes.
a. At the node (default) view, click the Provisioning > SONET DCC tabs.
b. Click Create.
c. Select the OC-N card that links to the adjacent node.
d. Click OK.
Step 5 If alarms are raised when the DCCs are turned on, follow the troubleshooting procedure in the “EOC”
section on page 1-28.
Step 6 If the alarm still does not clear, log on to http://www.cisco.com/tac for more information or call the Cisco
Technical Assistance Center to report a service-affecting problem (1-877-323-7368).
1.3.7 APSC-IMP
• Minor, Non-service affecting
An Improper SONET Automatic Protect Switch code alarm indicates invalid K bytes. This alarm occurs
on OC-N cards in a BLSR configuration. The receiving equipment monitors K bytes or K1 and K2 APS
bytes for an indication to switch from the working card to the protect card or vice versa. 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.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
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
Step 1 To determine the validity of the K byte signal, examine the received signal. Use an optical test set capable
of viewing SONET overhead.
Step 2 If the K byte is invalid, the problem lies in upstream equipment and not in the reporting ONS 15454.
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.