2-18
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 2 Alarm Troubleshooting
2.6.5 APSC-IMP
•
Codes that are irrelevant to the specific protection switching operation being requested.
•
Requests that are irrelevant to the ring state of the ring (such as a span protection switch request in
a two-fiber ring NE).
•
ET code in K2 bits 6 through 8 received on the incoming span, but not sourced from the outgoing
span.
Note
This alarm can occur on a VC_LO_PATH_TUNNEL tunnel when it does not have lower order circuits
provisioned on it. It can also occur when the exercise command or a lockout is applied to a span. An
externally switched span does not raise this alarm because the traffic is preempted.
Note
The APSC-IMP alarm may be raised on a MS-SPRing when a drop connection is part of a cross-connect
loopback.
Note
The APSC-IMP alarm may be momentarily raised on BLSR spans during PCA circuit creation or
deletion across multiple nodes using CTC.
Warning
Invisible laser radiation could be emitted from the end of the unterminated fiber cable or connector.
Do not stare into the beam directly with optical instruments. Viewing the laser output with certain
optical instruments (for example, eye loupes, magnifiers, and microscopes) within a distance of
100 mm could pose an eye hazard.
Statement 1056
Warning
Use of controls, adjustments, or performing procedures other than those specified may result in
hazardous radiation exposure.
Statement 1057
Clear the APSC-IMP Alarm
Step 1
Use an optical test set to determine the validity of the K byte signal by examining the received signal.
For specific procedures to use the test set equipment, consult the manufacturer.
Caution
Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15600 SDH. Plug the wristband cable into the ESD jack located on the lower-right edge of the shelf
assembly.
If the K byte is invalid, the problem lies with upstream equipment and not with the reporting
ONS 15600 SDH. Troubleshoot the upstream equipment using the procedures in this chapter, as
applicable. If the upstream nodes are not ONS 15600 SDHs, consult the appropriate user documentation.
Step 2
If the K byte is valid, verify that each node has a ring name that matches the other node ring names.
Complete the
“Identify an MS-SPRing Ring ID or Node ID Number” procedure on page 2-122
Step 3
Repeat
Step 4
If a node has a ring name that does not match the other nodes, make that node’s ring name identical to
the other nodes. Complete the
“Change an MS-SPRing Ring ID Number” procedure on page 2-122
.
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