Cisco Cisco ONS 15600 SDH, Troubleshooting Manual

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Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 2 Alarm Troubleshooting
2.6.6 APSCINCON
Step 5
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).
2.6.6 APSCINCON
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
Logical Object: STMN
An APS Inconsistent alarm means that an inconsistent APS byte is present in the SDH overhead. The
SDH overhead contains K1/K2 APS bytes that notify receiving equipment, such as the ONS 15600 SDH,
to switch the SDH signal from a working to a protect path when necessary. An inconsistent APS code
occurs when three consecutive frames contain nonidentical APS bytes, which in turn give the receiving
equipment conflicting commands about switching.
Clear the APSCINCON Alarm
Step 1 Look for other alarms, especially the “LOS (STMN)” alarm on page 2-86 , the “LOF (STMN)” alarm on
page 2-82 , or the “AIS” condition on page 2-15 . Clearing these alarms clears the APSCINCON alarm.
Step 2
If an APSINCON alarm occurs with no other alarms, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call Cisco TAC (1 800 553-2447).
2.6.7 APSCM
Default Severity: Major (MJ), Service-Affecting (SA)
Logical Object: STMN
The APS Channel Mismatch alarm occurs when the ONS system expects a working channel but receives
a protect channel. In many cases, the working and protect channels are crossed and the protect channel
is active. If the fibers are crossed and the working line is active, the alarm does not occur. The APSCM
alarm occurs only on the ONS system when bidirectional protection is used on STM-N cards in a 1+1
configuration.
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
Note
APS switches are hitless in the ONS 15600 SDH.