ADTRAN 1204006L1 Manuel d'utilisateur télécharger pdf (Page 29)

Chapter 1. Introduction

61200208L1-1 Express 5210 User Manual 1-7

DBU Card Option Descriptions

4-Wire Switched 56 DBU 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 DBU Card

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

33.6 kbps over an ordinary telephone network.

ISDN DBU Card

1B+D Basic Rate ISDN service provides backup over a switched

56/64 kbps circuit.

DCE Card

This module connects an external DCE device to the Express 5210.

The card can act either as a dial backup interface or as an alternate

network interface (supporting access rates up to 512 kbps).

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ADTRAN 1204006L1 Manuel d'utilisateur Page 29