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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.14 APSC-IMP
protection or 1+1 configuration does not send the two valid K1/K2 APS bytes anticipated by a system
configured for BLSR. One of the bytes sent is considered invalid by the BLSR configuration. The K1/K2
byte is monitored by receiving equipment for link-recovery information.
Troubleshooting for APSCDFLTK is often similar to troubleshooting for the “BLSROSYNC” alarm on
page 2-57.
Clear the APSCDFLTK Alarm
Step 1 Complete the “Identify a BLSR Ring Name or Node ID Number” procedure on page 2-261 to verify that
each node has a unique node ID number.
Step 2 Repeat Step 1 for all nodes in the ring.
Step 3 If two nodes have the same node ID number, complete the “Change a BLSR Node ID Number” procedure
on page 2-261 to change one node ID number so that each node ID is unique.
Step 4 If the alarm does not clear, verify correct configuration of east port and west port optical fibers. (See the
“E-W-MISMATCH” alarm on page 2-90.) West port fibers must connect to east port fibers and east port
fibers must connect to west port fibers. The “Install Cards and Fiber-Optic Cable” chapter in the
Cisco ONS 15454 Procedure Guide provides procedures for fibering BLSRs.
Step 5 If the alarm does not clear and the network is a four-fiber BLSR, ensure that each protect fiber is
connected to another protect fiber and each working fiber is connected to another working fiber. The
software does not report any alarm if a working fiber is incorrectly attached to a protect fiber.
Step 6 If the alarm does not clear, complete the “Verify Node Visibility for Other Nodes” procedure on
page 2-261.
Step 7 If nodes are not visible, complete the “Verify or Create Node Section DCC Terminations” procedure on
page 2-275 to ensure that section data communications channel (SDCC) terminations exist on each node.
Step 8 If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
for more information or call Cisco TAC 1 800 553-2447.
2.7.14 APSC-IMP
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
SONET Logical Object: OCN
An Improper SONET APS Code alarm indicates three consecutive, identical frames containing:
• Unused code in bits 6 through 8 of byte K2.
• 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 VT tunnel when it does not have VT 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 traffic is preempted.
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