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Chapter 1. Introduction
Interfaces
PC or Modem
Network
6
The TSU 120 base unit is equipped with a slot in the
rear panel to house option modules which provide a
variety of additional data ports. See Figure 1-3.
The base unit is equipped with the following five
interfaces:
• Network DSI interface per AT&T 61402
• DSX-1 (PBX)
• Nx56/64 serial V.35 high-speed interface
• Control input (RS-232)/Chain port input
• Chain port output
The option modules which are designed to slide into
the rear panel option slot can have up to four inter-
faces. The following modules are currently available:
• DSX-1 (PBX)
• Nx56/64 - single or dual
• Voice (FXS/FXO/4E&M/4T0) - 2 channels/4
channels
• Office Channel Unit Data Port (OCU DP) - single or
dual
• Full drop and insert
• Dial backup
Control
Chain
Input
Output
TSU 120
NI
DSX-1
Nx56/64
Option
Up to 4
To PBX
TSU 120 User Manual
Chain
Chain
Input
Output
TSU 120
NI
DSX-1
Nx56/64
Option
Up to 4
To PBX
TSU 120 Interfaces
Figure 1-3
61200.129L1-1
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