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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.
PC or Modem
Network
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
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
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.
61202129L1-1
10BaseT LAN
(TSU 120e only)
Control
Chain
Input
Output
TSU 120e
NI
DSX-1
Nx56/64
Option
V.35
PBX
Figure 2-3. TSU 120 Interfaces
IN and OUT test jacks
provides a bridged access jack for non-
R-MON test jack
TSU 120 User Manual
Chapter 2. Installation
Chain
Chain
Input
Output
TSU 120e
NI
DSX-1
Nx56/64
Option
V.35
DSX-1
for the network interface provide
2-5
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