# PROGRAMMED FAILBACK

## Qualifiers:

ON

OFF

DISPLAY

SCHEDULE <hh:mm:ss>

## Purpose:

This command allows you to schedule a one hour time slot during which the system will automatically transfer a resilient T1/E1 trunk back from the secondary controller to the primary controller. You issue this command on the primary controller. The T1/E1 trunk will only fail back if there are no calls on the trunk circuits. Therefore, you should schedule the failback to occur during a period of low traffic.

NOTE: Refer to the Resiliency Guide for instructions on how to install, configure, troubleshoot and maintain T1/E1 trunk resiliency.

## Details:

- ON qualifier enables programmed failback.

- OFF qualifier disables programmed failback.

- DISPLAY qualifier shows whether programmed failback is enabled or disabled and the failback start time.

- SCHEDULE <hh:mm:ss> qualifier sets the programmed failback start time.

- The trunk will only fail back if there are no active calls on the resilient T1/E1 trunk.

- By default, Programmed Failback is disabled. If you do not enter a failback start time, the default failback start time is used. The default start time is 02:15:00 (2:15 AM).

- If you specify a start time, you must enter it in 24-hour format. Enter a time that will correspond with a period of low call traffic (for example, after business hours)

- This command only applies to the T1/E1 Combo MMC in the primary controller. If you have programmed one T1/E1 Combo card as the primary link and another T1/E1 Combo card in the same controller as a secondary link, the command information only applies to the card that functions as the primary link.

- The Programmed Failback command is ignored if you enter it on the secondary controller.

- The system checks call activity on the T1/E1 trunk approximately every minute for one hour starting from the programmed time that you entered. If a call is active on the T1/E1 trunk for the entire duration of the scheduled hour, the T1/E1 trunk will not fail back from the secondary. The primary system will generate a maintenance log to indicate that failback did not occur.

- The DISPLAY qualifier shows the programmed failback time and the status (ON or OFF) of the feature.

- You can also issue this command from the local telnet maintenance terminal (port 2023) of the secondary controller.

## Examples:

The following examples show how to display and set the programmed failback schedule:

### Entry: PROGRAMMED FAILBACK DISPLAY

System Response:

PROGRAMMED FAILBACK IS ON
PROGRAMMED FAILBACK SCHEDULE 10:00:00

### Entry: PROGRAMMED FAILBACK OFF

System Response:

PROGRAMMED FAILBACK IS OFF
PROGRAMMED FAILBACK SCHEDULE 10:00:00

### Entry: PROGRAMMED FAILBACK SCHEDULE 13:00:00

System Response:

PROGRAMMED FAILBACK IS OFF
PROGRAMMED FAILBACK SCHEDULE 13:00:00

### Entry: PROGRAMMED FAILBACK ON

System Response:

PROGRAMMED FAILBACK IS ON
PROGRAMMED FAILBACK SCHEDULE 13:00:00

Related Topics

- EDT Show Resiliency Info

- EDT Failover

- EDT Failback