Constellation™ November 2003
10-14 Troubleshooting Guidelines
TX TO MODEM (A1, A2 /
B1, B2)
Modem (A1, A2 / B1, B2) is not
receiving CLK from HLM.
Replace HLM. See Chapter 11
.
WS LOOPBACK
Wayside signal in loopback mode
locally.
Clear loopback test. Keypad
command: CONTROL >
WAYSIDE LPBK > WAYSIDE
LPBK > CLR
WS LPBK BY REMOTE
Wayside signals are looped back
toward the HLM.
Clear loopback by remote from
remote radio.
WS OUTPUT FAIL
No output signal or signal level too
low.
Check the termination. If it is
okay, replace the High Level
Mux.
WS REMOTE LPBK
Wayside signal loopback test from
the far end.
Clear remote loopback from
local radio. Keypad command:
CONTROL > WAYSIDE LPBK >
WAYSIDE RMT LPBK > CLR
WS RX LOF
Loss of frame of outgoing signal
from the High Level Mux.
Check the Modem alarms. If
okay, check far-end High Level
Mux.
Message Explanation
Course of Action/Possible
Causes
To Next Page
Loading...
