ADTRAN 1200214L1 User Manual
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61200214L1-1
IQ Probe User Manual
5
Chapter 1. Introduction
ESP CARD OPTIONS
4-Wire Switched 56 DBU Card
This dial-up 4-wire SW56 DBU 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. This card is compatible with AT&T Accunet
and Sprint SW56 type services.
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
2B+D Basic Rate ISDN service provides a switched 56/64 kbps
circuit with support for bonding of 112/128 kbps. This DBU
card supports a U-interface to the Basic Rate ISDN and is
compatible with National ISDN, Lucent, and DMS.
ESP DCE Card
This module connects an external DCE device to the IQ Probe for
the purpose of using an external DSU/CSU to support access
rates up to 2.048 Mbps.