User manual

Chapter 2. Installation
61202156L1-1 TDU 120e User Manual 2-5
TDU 120e Interfaces
The TDU 120e is equipped with an Nx/DBU data port, a DS-
1 interface, an option slot, management interfaces, an
external alarm connector, and a T1 interface, in the rear panel.
See Figure 2-2.
Figure 2-2. TDU 120e Interfaces
Network Interface
The Network Interface (NI) port provides the connection to
the T1. This port complies with the applicable ANSI and
AT&T standards. For more information, see Wiring on page
B-1.
Nx56/64 Serial Interface
The Nx56/64 provides a serial V.35 port that operates from
56kbps to 1.536Mbps. This port provides 511 pattern
generation and detection and remote loopback capability.
DS-1 (PBX) Interface
The DS-1 Interface provides a T1 for a PBX or other
equipment. This port complies with ANSI T1.102. It can be
software configured for either long-haul or short-haul.
Control Port Input
The control port input provides an EIA-232 input from a PC
or a modem for control of the TDU 120e. You can also use it
TSU 120e
PC or Modem
Network
Control
Input
Chain
Output
NI
TSU 120e
Chain
Input
Chain
Output
NI
Option Option
DS-1
Nx56/64 Nx56/64
DS-1
PBX
V.35
DS-1
V.35
10BaseT