CTI Products CHIB CommandSTAR Lite Host Interface Module - Manual (Page 22)

CHIB Hardware Reference Troubleshooting
CTI Products, Inc.
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18
PROBLEM CAUSE
presses.
If you disconnect both the network and the serial cable from the
CHIB, you should see a flash on this LED once every 4-5
seconds. If you see a different pattern than this with both the
cables disconnected, the CHIB is bad.