Loopback or DS1/DS3/EC1
Use the Loopback (or Loopback > Port, or DS1/DS3/EC) subtab to initiate terminal or facility loopbacks. For a list of ONS nodes and cards that support this subtab, see Maintenance.
 
Item
Description
Port
Displays the port number.
Admin State
Sets the port administration state. Choose an administrative state from the drop-down list and click Apply to change the port 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.
Note
CTC will not allow you to change a port service state from IS-NR to OOS-MA,DSBLD. You must first change a port to the OOS-MA,MT service state before putting it in the OOS-MA,DSBLD service state.
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.
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.
Inhibit FE Lbk
(Does not apply to all cards) When checked, inhibits far-end loopback.
Inhibit FE Backplane Lbk
When checked, the smartjack loopcodes, that is, backplane loopcodes, are not detected.
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.

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