Cisco ONS 15454 Troubleshooting Manual page 422

2.7.380 SQUELCH
SPAN-SW-WEST is an informational condition and does not require troubleshooting.
Note
2.7.380 SQUELCH
The Ring Squelching Traffic condition occurs in a BLSR when a node that originates or terminates STS
circuits fails or is isolated by multiple fiber cuts or maintenance Force Ring commands. The isolation or
failure of the node disables circuits that originate or terminate on the failed node. SQUELCH conditions
appear on one or both of the nodes on either side of the isolated or failed node. The
on page 2-37
Warning On the OC-192 card, the laser is on when the card is booted and the safety key is in the on position
(labeled 1). The port does not have to be in service for the laser to be on. The laser is off when the
safety key is off (labeled 0). Statement 293.
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 could result in
hazardous radiation exposure. Statement 1057
Clear the SQUELCH Condition
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 edge of the shelf assembly.
Determine the isolated node:
Step 1
a.
b.
Verify fiber continuity to the ports on the isolated node. To verify cable continuity, follow site practices.
Step 2
If fiber continuity is good, verify that the proper ports are in service:
Step 3
a.
b.
c.
Cisco ONS 15454 Troubleshooting Guide, R8.5
2-228
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: OCN
also appears on all nodes in the ring except the isolated node.
From the View menu, choose Go to Network View.
The grayed out node with red spans is the isolated node.
Confirm that the LED is correctly illuminated on the physical card.
A green ACT/SBY LED indicates an active card. An amber ACT/SBY LED indicates a standby card.
To determine whether the OC-N port is in service, double-click the card in CTC to open the card
view.
Click the Provisioning > Line tabs.
Chapter 2 Alarm Troubleshooting
"AIS-P" condition
November 2009