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Chapter 2. Installation
61202129L1-1 TSU 120 User Manual
2-5
TSU 120 Interfaces
The TSU 120 is equipped with a Nx56/64 data port, a DSX-1
interface, an option slot, management interfaces, and a T1
interface, in the rear panel. See Figure 2-3.
Figure 2-3. TSU 120 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 the Wiring section in
Appendix C, on page C-1.
Network Test Interface
The
IN and OUT test jacks for the network interface provide
intrusive test capability for the incoming T1. By connecting to
these jacks with test equipment, the T1 connection will be bro-
ken, and the test equipment will terminate the incoming T1.
The
R-MON test jack provides a bridged access jack for non-
intrusive monitoring of the incoming T1. When connected to
this jack, the test equipment should be configured for a bridged
termination.
Nx56/64 Serial Interface (TSU 120e only)
The Nx56/64 provides a serial V.35 port that operates from
56 kbps to 1.536 Mbps. This port provides 511 pattern genera-
tion and detection and remote loopback capability.
TSU 120e
PC or Modem
Network
Control
Input
Chain
Output
NI
TSU 120e
Chain
Input
Chain
Output
NI
Option Option
DSX-1
Nx56/64 Nx56/64
DSX-1
PBX
V.35
DSX-1
V.35
10BaseT LAN
(TSU 120e only)