Harris Constellation - Page 149

Harris Corporation Constellation™
Troubleshooting Guidelines 11-13
TROUBLESHOOTING
GUIDELINES
TRIB LPBK BY REMOT One or several T1 signals are looped
back toward the HLM. This signal
was sent by remote radio.
Clear loopback at remote site.
TRIB REMOTE LPBK
(A1...A28, B1...B16)
Coordinating one or several T1
signals are looped back toward the
HLM.
Clear by Keypad command:
CONTROL > TRIB REMOTE LPBK
> TRIB RMT LPBK > CLR.
TX-A, B, ATPC BOOST Boost request from coordinating
Receiver.
Path or far-end Transmitter.
TX ABSENT (A1, A2 / B1,
B2)
Transmitter Assembly unplugged or
not installed per configuration.
Power Supply turned off or
defective.
Defective Transmitter Assembly.
Before plugging in the Tx, turn
off the Tx switch.
If all 3 RF cards show absent
alarms, the trouble is most
likely to be in the Power Supply.
Replace the PS card.
Before turning on the PS, turn
off the Tx.
Replace the Tx Assy. You must
reset the output power. See
Chapter 12.
TX ENCODER Modem FEC circuitry unlocked.
Possible cause: bad Modem.
Replace Modem. See
Chapter 12.
TX LEVEL IF signal output from the Modem is
3 dB low.
Replace Modem. See
Chapter 12.
TX LOSS OF FRAME (HLM) Loss of frame into HLM from
customer.
Check input signal.
TX TO HLM-1, 2 ALM Tx signal from M12 Unit to HLM-1, 2
is not being received.
Replace the M12 Unit.
TX TO MODEM (A1, A2 /
B1, B2)
Modem (A1, A2 / B1, B2) is not
receiving CLK from HLM.
Replace HLM. See Chapter 12.
WS LPBK 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