2-17
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 2 Alarm Troubleshooting
2.6.4 APSCDFLTK
Step 3
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).
2.6.4 APSCDFLTK
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
Logical Object: STMN
The APS Default K Byte Received alarm occurs when a bidirectional line switched ring (MS-SPRing)
is not properly configured—for example, when a four-node MS-SPRing has one node configured as a
unidirectional path switched ring (SNCP). When this misconfiguration occurs, 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.
Clear the APSCDFLTK Alarm
Step 1
Complete the
“Identify an MS-SPRing Ring ID or Node ID Number” procedure on page 2-122
to verify
that each node has a unique node ID number.
Step 2
for all nodes in the ring.
Step 3
If two nodes have the same node ID number, complete the
“Change an MS-SPRing Node ID Number”
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 2-48
.) 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 15600 SDH Procedure Guide
contains procedures for fibering an MS-SPRing.
Step 5
If the alarm does not clear and if the network is a four-fiber MS-SPRing, 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
.
Step 7
If nodes are not visible, complete the
“2.8.5 Verify or Create Node DCC Terminations” procedure on
to ensure that SDH data communication channel (DCC) 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).
2.6.5 APSC-IMP
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
Logical Object: STMN
An Improper SDH APS Code alarm indicates three consecutive, identical frames containing:
•
Unused code in bits 6 through 8 of byte K2.
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