ADTRAN 1200212L1, User Manual

Page: 33 / 172

Chapter 1. Introduction
61200212L1-1 DSU IQ User Manual 1-5
TELNET
Telnet provides a password-protected, remote login facility to the
DSU IQ. Telnet allows a user on a network manager to control the
DSU IQ through the terminal menus.
DIAL BACKUP OPERATION
The DSU IQ dial backup (DBU) option cards allow frame relay
circuit outage recovery for one user-to-network interface (UNI) at a
time. The DSU IQ can be configured to originate a call based on
physical layer conditions and/or PVC signaling outages. Once the
criteria is met, the DSU IQ establishes a call to the configured
phone number and the connection is used to carry traffic for the
PVC(s) configured for DBU operation.
In the case of PVC outages (not physical layer port failure), the DSU
IQ’s two-port design allows the DSU IQ receiving the call to
continue to use the T1 frame relay circuit for VCs that are not
affected by the outage, while using the DBU interface for PVCs that
are inactive due to the outage. A DSU IQ with multiple PVCs to
multiple sites can also originate a call to one site during an outage
and restore connection for PVCs to that destination.
The DSU IQ's unique DBU cards are field-installable by the
customer. See Installation on page 2-1 for information on installing
DBU cards. The DBU cards are compatible with other ADTRAN
products supporting DBU. The backup options are described in the
following section, Interface Card Options on page 1-6. Contact the
local telco provider to determine which services are available in
your area. See Applications on page 4-1 for more information,
including an example of a dial backup application.