AT&T Release 2.0 CSU Front-Panel Controls, N c t i o n, CSU Front-Panel Test Jacks, O v i d e s

Connecting the Control Unit to the Network Interface

Table 419. CSU Front-Panel Controls

Control

LOOPBACK SENDCODE

ACO

F u n c t i o n

Loops the incoming signal from the system to the system

Sends loop-up or loop-down code to far-end CSU

Functions only when the ALARM LED is lit; turns on ACO LED and deactivates audible alarm; clears a arm if the alarm condition has been cleared

Table 4-20. CSU Front-Panel Test Jacks

Jack

DIAGNOSTIC

EQ IN

EQ OUT

SM IN

SM OUT

EQ MON

SM MON

+1, -1

P r o v i d e s

Access via 310 jack to the 4-kbps data link

Break-in access to transmit line to system

Break-in access to receive line from system

Break-in access in transmit path to network

Break-in access in receive path from network

Monitor access to received signal from system

Monitor access to received signal from network

Test points for measuring simplex current from network to critical circuits-(if provided)

4-32Installing the Channel Service Unit