Loopback
Use the Loopback (or Loopback > Port) 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
Displays the port administrative 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. Administrative states include:
unlocked—Puts the port in service. The port service state changes to unlocked-enabled.
locked,disabled—Removes the port from service and disables it. The port service state changes to unlocked-enabled,disabled.
locked,maintenance—Removes the port from service for maintenance. The port service state changes to unlocked-enabled,maintenance. For loopbacks, the locked,maintenance admin state must be initiated.
unlocked,automaticInService—Puts the port in automatic in-service. The port service state changes to unlocked-disabled,automaticInService.
Note
CTC will not allow you to change a port service state from unlocked-enabled to locked-enabled,disabled. You must first change a port to the locked-enabled,maintenance service state before putting it in the locked-enabled,disabled service state.
Service State
An autonomously generated state that gives the overall condition of the port. Service states appear in the format: AdministrativeState-OperationalState, StatusAttribute. For additional state information, see States.
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 unlocked-enabled,maintenance.
Send AIS on Facility Loopback
(Does not apply to all cards) When checked, sends an alarm indication signal when a facility loopback occurs.
Send AIS on Terminal Loopback
(Does not apply to all cards) When checked, sends an alarm indication signal when a terminal loopback occurs.
Inhibit FE Lbk
(Does not apply to all cards) When checked, inhibits far-end 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.

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