Table 419. Csu Front-Panel Controls; Table 4-20. Csu Front-Panel Test Jacks - AT&T MERLIN LEGEND Release 2.0 Installation Section

Connecting the Control Unit to the Network Interface

Table 419. CSU Front-Panel Controls

Control
LOOPBACK
SENDCODE
ACO

Table 4-20. CSU Front-Panel Test Jacks

Jack
DIAGNOSTIC
EQ IN
EQ OUT
SM IN
SM OUT
EQ MON
SM MON
+1, -1
4-32
Installing the Channel Service Unit
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
condition has been cleared
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)
F u n c t i o n
P r o v i d e s
arm if the alarm