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6 FSU 5622 ESP User Manual 61200.175L1-1

Chapter 1. Introduction

DIAL BACKUP OPERATION

The FSU 5622 ESP's unique DBU cards are field-installable by the

customer. See the chapter Installation for information on install-

ing DBU cards. The DBU cards are compatible with other

ADTRAN ESP products supporting DBU (see the following

note). The four backup options are described in the following

sections. Contact the local telco provider to determine which

services are available in your area. See the chapter Applications

for more information, including an example of a dial backup

application.

The ESP V.34 DBU is not compatible with the TSU ESP.

ESP Dial Backup Options

4-Wire Switched 56 Card

This dial-up 4-wire SW56 card allows you to pay for data

connection only for the time the unit is active. The regional

operating companies provide the 4-wire local loop service to

SW56 customers.

V.34 Card

This module backs up the leased line application at data rates up

to 33.6 kbps over an ordinary telephone network.

ISDN Card

1B+D Basic Rate ISDN service provides a switched 56/64 kbps

circuit.

ESP DCE Card

This module connects an external DCE device to the FSU 5622

ESP for the purpose of using an external DSU/CSU to support

access rates up to 512 kbps.

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