Loopback


Use the Loopback (or Loopback > Port) subtab to initiate terminal or facility loopbacks. The Loopback tab applies to the following cards:

Port

The port number.

Admin State

The port administration state. Choosing an administrative state from the drop-down list and clicking Apply changes the port's service state unless network conditions prevent the change. Admin states include:

  • IS-Puts the port in-service. The port service state changes to IS-NR.

  • OOS,DSBLD-Removes the port from service and disables it. The port service state changes to OOS-MA,DSBLD.

  • OOS,MT-Removes the port from service for maintenance. The port service state changes to OOS-MA,MT. For loopbacks, the OOS,MT admin state must be initiated.

  • IS,AINS-Puts the port in automatic in-service. The port service state changes to OOS-AU,AINS.

Service State

An autonomously generated state that gives the overall condition of the port. Service states appear in the format: Primary State-Primary State Qualifier, Secondary State. Port service states include:

  • IS-NR-(In-Service and Normal) The port is fully operational and performing as provisioned.

  • OOS-MA,DSBLD-(Out-of-Service and Management, Disabled) The port is out-of-service and unable to carry traffic.

  • OOS-MA,MT-(Out-of-Service and Management, Maintenance) The port is out-of-service for maintenance. Alarm reporting is suppressed, but traffic is carried and loopbacks are allowed.

  • OOS-AU,AINS-(Out-Of-Service and Autonomous, Automatic In-Service) The port is out-of-service, but traffic is carried. Alarm reporting is suppressed. The ONS node monitors the ports for an error-free signal. After an error-free signal is detected, the port stays in OOS-AU,AINS state for the duration of the soak period. After the soak period ends, the port service state changes to IS-NR.

Loopback Type

Allows you to provision a terminal or facility loopback, or clear an existing current loopback (none). Loopbacks can only be provisioned when the service state is OOS-MA,MT.

Note     The ONS 15600 OC-192 card supports only payload loopbacks, the ONS 15600 OC-48 card supports only facility loopbacks, and the ASAP ports support both facility and terminal loopbacks.

Inhibit FE Lbk

(ONS 15310-CL [15310-CL-CTX DS-3 ports] and ONS 15454) When selected, inhibits far-end loopback.

Send Code

(ONS 15310-CL [15310-CL-CTX DS1 ports] and ONS 15454 [DS3XM12 card DS1 ports]) Allows you to specify the loopback type for DS-1 and DS-3. The options are:

  • Feac Loopback-Far-end alarm and control loopback; sets the DS-3 signal for loopback.

  • Payload Loopback-Sets the DS1 payload for loopback.

  • Line Loopback-Sets the full DS1 signal for loopback.

  • None

Send AIS on Facility Loopback

(ONS 15310-CL 15310-CL-CTX only) When selected, sends an alarm indication signal.

Send AIS on Terminal Loopback

(ONS 15310-CL 15310-CL-CTX only) When selected, sends an alarm indication signal.

Apply

Applies changes made to the fields in the tab.

Reset

Cancels any changes to the tab and returns the fields to their last-saved settings.

Help

Displays context-sensitive help.