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Chapter 1. Introduction
1-4 TDU 120e User Manual 61202156L2-1A
TDU 120e OPTION MODULES
Some of the option modules available for the TDU 120e
are:
DSX-1
Provides a short haul T1 interface for operation with a
PBX (Terminal Interface).
Full Drop and Insert
Permits the dropping of data and insertion of new data
into the same DS0 time slot.
This module includes a long haul DS-1 interface. It can
also be used as a second DS-1 interface to provide an up
to 3 MB aggregate throughput.
Nx56/64 serial interface
Provides a V.35 serial interface in either single or dual
versions.
Voice interface
Provides 2 or 4 channels FXS/FX0/E&M.
OCU DP
Interfaces to DDS or 4-wire Switched 56, dual or single
versions.
DSU DP
Provides two sync or async ports (EIA-232 or V.35).
Dial backup
Allows for backup of data upon network T1 failure.
U-BR1TE
Allows ISDN lines to be extended over a T1 line.