ADTRAN TSU LT User Manual download pdf (Page 24)

Chapter 2 Inspection and Installation TSU LT User Manual

Figure 2-2. TSU LT Interfaces

Network Interface (NI)

The Network Interface (NI) port provides the connection to the T1/FT1. It complies with the applicable

ANSI and AT&T standards.

Control Port Input (Chain In)

The control port input provides an EIA-232 input from a PC or a modem for control of the TSU LT. You

can also use it as a Chain input from any ADTRAN unit with a Chain port or as input for PC proxy agent

control.

Chain Port Output (Chain Out)

The chain port output include provides an EIA-232 output to chain control to other TSU LTs.

V.35 Nx56/64 Serial Interface

The Nx56/64 serial interface operates at the following data rates: N*56K or N*64K, where N=1 to 24

(DS0s).

POWER UP TESTING & INITIALIZATION

Self-Test

When shipped from the factory, the TSU LT is set to factory default conditions. When you first power-up,

the unit automatically executes self-tests followed by an initialization sequence which sets up the unit. The

self-test checks the integrity of the internal operation of the electronic components by performing memory

tests and by sending and verifying data test patterns through all internal interfaces. Although actual user

data cannot be passed during these tests, the self-test can run with the network and DTE interfaces in place,

without disturbing any external interface.

The self-test automatically executes upon power-up. It can also be commanded from a front panel menu or

from the control port.

TSU

PC or Modem

Network

Nx56/64

Control

Input

Chain

Output

TSU

Nx56/64

Chain

Input

Chain

Output

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ADTRAN TSU LT User Manual Page 24