7. Operation and Maintenance7-72 September 2002 9128-A2-GB20-80ISDN DBM OperationThe following sections only apply to units with an ISDN DBM:Forcing Backup (Disruptive)Placing a Test Call (Nondisruptive)Verifying ISDN LinesVerifying That Backup Can Take PlaceForcing Backup (Disruptive)Use this procedure to force backup when network maintenance is planned, whenequipment problems are reported, or when testing the backup path – wheneverdata needs to be forced from the primary destination interface to the alternatedestination, typically from the T1 network to the ISDN.Procedure1. Make sure the ISDN Link Profiles are set up correctly, Auto Backup is enabled,and the ISDN interface is enabled (seeSetting Up Dial Backup in Chapter 4,Configuration Options).2. Have someone at the far end disconnect the network cable to initiate backup.3. Verify that backup is taking place.SeeVerifying That Backup Can Take Place on page 7-74.NOTE:When an alarm requiring backup is received, backup can be manuallycontrolled by enabling or disabling the Auto Backup option (see Step 2).4. Have the far-end network cable reconnected to return to standard operation.
