Important!

The AIS Threshold parameter for the timing output ports in this procedure will not work unless Sync Messaging is enabled on the associated OC-n ports, although the NE will allow the user to change the parameter value. The AIS Threshold setting is the sync status message quality level which will generate AIS on the output ports.

To prevent AIS from being generated on the timing output ports, the sync status message level received from the optical interface synchronization source must be a higher quality than that set for the AIS Threshold.

If required, select View → Timing/Sync from the System View menu, then select the Sync Message Status tab to determine if sync messaging is enabled or disabled. SByte in the Type column indicates that sync messaging is enabled. If sync messaging is enabled, make a note of the Input Message levels for the associated OC-n ports.

If required, select Configuration → Equipment to access the required OC-n port and enable the Sync Messaging parameter.

If required, select View → Timing/Sync, click on the Sync Message Status tab, and make a note of the Input Message level for the required OC-n ports.

Reference:

Procedure 4-4: Provision OLIU circuit packs/ports for service

From the System View menu, select Configuration → Timing/Sync.

Result:

The Configure Timing/Sync window opens.

Select the System Timing tab.

NOTICE Service-disruption hazard

Changing the System Synchronization Characteristic parameter of an in-service system may affect system operations. Circuit pack failures and service interruptions may occur.

The System Synchronization Characteristic parameter is generally provisioned when the system is integrated into a network. Do not change the System Synchronization Characteristic parameter unless you are reconfiguring the network and have been directed to do so.

If required, provision the System Synchronization Characteristic according to the work instructions.

For more information about the System Synchronization Characteristic, refer to System synchronization characteristic.

From the Timing Mode drop-down menu, select Line.

For Output Timing, select Enabled.

With the Timing Mode set to Line, and Output Timing set to Enabled, the synchronization mode is set to Line SyncOut.

Important!

The sync status message level of the selected line must be higher than the AIS Threshold level setting in Step 9 to prevent AIS from being generated on the output ports.

It is recommended that Synchronization Autoreconfiguration be enabled to provide the most reliable network synchronization.

Provision the Clock Mode Switching, Reference Switching, Optical Synchronization Source, and Synchronization Autoreconfiguration parameters according to the work instructions.

For more information about clock mode switching and reference switching, refer to Clock mode switching and Reference switching.

For more information about Synchronization Autoreconfiguration, refer to Synchronization autoreconfiguration.

Select the Timing Output Ports tab.

Important!

The AIS Threshold function for the timing output ports will not work unless Sync Messaging is enabled on the associated OC-n port, although the NE will allow the user to change the AIS threshold value.

Synchronization Status Messages on DS1 external references are only supported when the ESF frame format is provisioned. Synchronization Status Messages on E1 external references are only supported when the CRC4 frame format is provisioned.

Provision the required AIS Threshold (SONET and SDH), REF-1, REF-2, and SSM (Synchronization Status Messages) parameters for the timing output reference signals according to the work instructions.

Click OK.

Result:

A warning message may appear. Click Yes to execute the command.

End of steps