6 Options980-001-0240B FrameSaver NP 110 User’s Manual - Installation Guide6-37November 2000ISDN Tests ISDN testing features include Network Loopback, User Loopback and Adapter Statusinformation and Tests.Network Loopback The ISDN “B” channels may be looped back (toward the Network) for external testing.Configured for Backup operationLoopback of a B-Channel is automatically initiated when connection is made to a Dial-In call, provided the B-Channel is currently configured for Backup operation.NOTE: In some cases, the Directory # assigned (as entered and displayed onthe ISDN Configuration screen), may not match the actual number to be di-aled in order to establish a Dial-In connection to the B-Channels. Contact theNetwork Control Center or Telephone Service Provider to verify the Dial-Innumber if problems are encountered.The Backup process has priority over loopback, and will automatically clear a B-Chan-nel loopback and initiate the Backup process if Backup is triggered while a loopbackis established.Configured for On-Demand operationThe “Call Out/Loop” test feature on the ISDN Status / Test screen initiates a Band-width On Demand (BOD) call-out and sets a loopback toward the Network at the On-Demand configured data rate.
