Loopback or DS3

Use the Loopback (or Loopback > Port, or DS3 from DS3 cards) subtab to initiate terminal or facility loopbacks. For a list of ONS nodes and cards that support this subtab, see Maintenance.

Port

Displays the port number.

Admin State

Sets 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

Displays the autonomously generated state that gives the overall condition of the port. Service states appear in the format: Primary State-Primary State Qualifier, Secondary State. For additional state information, see States.

Loopback Type

Provisions a terminal or facility loopback, or clears an existing current loopback (none). Loopbacks can only be provisioned when the service state is OOS-MA,MT.

Note     For DS1 (DS1/E1-56, DS3XM-12, and 15310-CL-CTX), when a far-end line loopback command is received, the field displays "FE Facility (Line)".

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

(Does not apply to all cards) When checked, inhibits far-end loopback.

Send Code

(Does not apply to all cards) Allows you to specify the loopback type for DS-1 and DS-3 far-end node. 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

(Does not apply to all cards) When checked, sends an alarm indication signal when there is a facility loopback.

Send AIS on Terminal Loopback

(Does not apply to all cards) When checked, sends an alarm indication signal when there is a terminal loopback.

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.