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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. The 4-wire SW56 DBU card is compatible with AT&T
Accunet and Sprint SW56 type services.
V.34 DBU Card
The V.34 DBU card provides switched backup of the leased line
application. This module allows backup data rates of up to
33.6 kbps over the public switched telephone network (PSTN).
ISDN DBU Card
The ISDN 1B+D card supports a U-interface to the Basic Rate ISDN
and is compatible with National ISDN and AT&T DMS. 1B+D Basic
Rate ISDN service provides a switched 56/64 kbps circuit.
PRI DBU Card
The PRI DBU 23 B+D (primary rate interface dial backup) card
allows the TSU IQ+ to accept or place up to 23 dial backup calls
simultaneously. This card supports 64Kbps data service. Incoming
calls will be accepted for 56Kbps or 64Kbps service. Bonding is not
supported. Fractional PRI capability is supported.
DCE Card
This module is used to connect a TSU IQ+ to an external DBU
device such as an ISDN terminal adapter. The DTR lead is used to
control the dial process in this case.
61200275L1-1
TSU IQ+ User Manual
Chapter 1. Introduction
1-7
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