Adtran 1200305L1 Manual Do Utilizador

61200305L1-1F

© 2002 ADTRAN, Inc.

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Dial backup is an ATLAS 550 capability which allows you to create alternate data connections in the unit 
to ensure data integrity in the event of a primary circuit failure. This note will explain what dial backup is 
and how to configure an ATLAS 550 to support it. There are three steps to configuring the ATLAS 550 for 
dial backup: Configuring the Dedicated T1 Data Link, Configuring the Dial Backup PRI, and Configuring 
the Dial Backup Endpoint.

This application requires an ATLAS 550 containing firmware B.01 or later, a V.35 Nx Module 
(P/N 1200311L1), and a BONDing Module (P/N 1200326L1) if bonding of B channels is required.

The ATLAS 550 will either originate or answer a dial backup call upon detection of a network failure or 
data failure on the T1/E1. A network failure is any physical layer T1/E1 failure, such as red alarm or loss 
of signal (LOS). A data failure is detected when the ATLAS 550 no longer receives keep-alive responses 
over the 8K inband channel. The data criteria for dial backup can only be used when configured to monitor 
the inband channel.