Squelch - Cisco ONS 15327 User Documentation

Alarm Procedures
Procedure: Clear the SNTP-HOST Alarm
Contact the network administrator that manages the IP network supplying the SNTP information to the
Step 1
proxy and determine if the network is experiencing problems which may affect the SNTP server/ router
connecting to the proxy ONS 15327.
On the ONS node serving as the proxy, click the CTC Provisioning > General tabs.
Step 2
Ensure that the Enable Proxy check box is checked.
Step 3
If the Enable Proxy check box is not checked, check this box.
Step 4
Refer to the ONS 15454 Reference Manual for more information on SNTP Host.
Step 5

14.4.111 SQUELCH

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The ring is squelching traffic (SQUELCH) alarm 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 the circuits that originate or terminate on the failed node.
Squelch alarms appear on one or both of the nodes on either side of the isolated/failed node. The AIS-P
alarm also appears on all nodes in the ring, except the isolated node.
Invisible laser radiation may be emitted from the aperture ports of the single-mode, fiber-optic
Warning
modules when no cable is connected. Avoid exposure and do not stare into open apertures.
Warning Invisible laser radiation may 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 may
pose an eye hazard. Use of controls or adjustments or performance of procedures other than those
specified may result in hazardous radiation exposure.
Always use the supplied ESD wristband when working with a powered ONS 15327. Plug the wristband
Caution
cable into the ESD jack located on the lower-right outside edge of the shelf assembly.
Procedure: Clear the SQUELCH Condition
Determine the isolated node:
Step 1
a.
b.
Verify fiber continuity to the ports on the isolated node.
Step 2
Step 3 Verify that the proper ports are in service.
Use an optical test set to verify that a valid signal exists on the line.
Step 4
Cisco ONS 15327 User Documentation, R3.3
14-78
Not Alarmed, Non-Service-Affecting (Condition)
Display the CTC network view.
The grayed out node with red spans is the isolated node.
Chapter 14 Alarm Troubleshooting
June 2002