ATLAS 550 System Manual - Adtran

CFG-1 Dial Backup for Dedicated T1 Circuits
Introduction
Dial backup (DBU) 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 explains 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:
1. Configure the Dedicated T1 Data Link
2. Configure the Dial Backup PRI
3. Configure the Dial Backup Endpoint
Before You Begin
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.
Description
The primary link to be backed up must be a data link to a V.35 port. Dedicated dial backup
for T1 ports is not currently supported.
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.
61200305L2-1B © 2004 ADTRAN, Inc. 353