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Connecting the Control Unit to the Network Interface
Table 419. CSU Front-Panel Controls
Control
Function
LOOPBACK Loops the incoming signal from the system to the system
SENDCODE Sends loop-up or loop-down code to far-end CSU
ACO
Functions only when the ALARM LED is lit; turns on ACO
LED and deactivates audible alarm; clears a
condition has been cleared
arm if the alarm
Table 4-20. CSU Front-Panel Test Jacks
Jack
Provides
DIAGNOSTIC
Access via 310 jack to the 4-kbps data link
EQ IN
Break-in access to transmit line to system
EQ OUT
Break-in access to receive line from system
SM IN
Break-in access in transmit path to network
SM OUT
Break-in access in receive path from network
EQ MON
Monitor access to received signal from system
SM MON
Monitor access to received signal from network
+1, -1
Test points for measuring simplex current from network to
critical circuits-(if provided)
4-32
Installing the Channel Service Unit