Specifications
1-8
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 1 Alarm Troubleshooting
d. Repeat steps a – c for all nodes in the ring.
Step 4 If a node has a ring ID number that does not match the other nodes, change the ring ID number of that
node to match the other nodes in the ring.
Step 5 Click Apply.
1.3.8 APSCINCON
• Minor, Service affecting
An inconsistent automatic protection switching (APS) code is present. The SONET overhead contains
K1/K2 APS bytes that notify receiving equipment, such as the ONS 15454, to switch the SONET signal
from a working to a protect path. An inconsistent APS code occurs when three consecutive frames do
not contain identical APS bytes. Inconsistent APS bytes give the receiving equipment conflicting
commands about switching.
Procedure: Clear the APSCINCON Alarm on an OC-N Card in a BLSR
Step 1 Look for other alarms, especially LOS, loss of frame (LOF) or AIS. Clearing these alarms clears the
APSCINCON alarm.
Step 2 If an APSINCON alarm occurs with no other alarms, 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).
1.3.9 APSCM
• Major, Service affecting
The APS Channel Mismatch alarm occurs when the ONS 15454 expects a working channel but receives
a protection channel. In many cases, the working and protection channels are crossed and the protect
channel is active. If the fibers are crossed and the working line is active, the alarm will not occur. This
alarm occurs in a 1+1 configuration.
The APSCM alarm only occurs on the ONS 15454 when 1+1 bidirectional protection is used on OC-N
cards in a 1+1 configuration.
Warning
Invisible laser radiation may be emitted from the aperture ports of the single-mode fiber optic
modules when no cable is connected. Avoid exposure and do not stare into open apertures.
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.