Harris Constellation, Installation & Maintenance

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Constellation™ November 2003
10-10 Troubleshooting Guidelines
M12-1...M12-8 ABSENT
M12 Unit is unplugged.
The M12 slot is different from the
configuration when the system was
first turned on.
Defective M12 Unit.
Is the M12 Unit plugged in?
Check the configuration with the
Keypad.
Replace the defective M12 Unit.
See
Chapter 11 .
M12-1...M12-8 RX CLK
M12-1...M12-8 Unit is not receiving
CLK from HLM.
Probable cause is a faulty HLM.
M12-1...M12-8 TX CLK
M12 Unit is not receiving TX CLK
from HLM.
Probable cause is a faulty HLM.
M12 FILLER MISSING
Filler Unit is missing from unused
M12 slot. Install a Filler Unit in the
missing slot.
M12 STBY ABSENT
M12 Unit is unplugged from the M12
Standby slot.
M12 Unit is not equipped per
configuration.
Defective M12 card.
Is the M12 Unit plugged in?
Install an M12 Unit.
Replace the M12 Unit. See
Chapter 11 .
M12-STBY RX CLK
HLM is not receiving CLK from
M12-Standby Unit. Replace the M12 Unit in the M12
Standby slot.
M12-STBY TX CLK
M12 Standby Unit is not receiving
TX CLK from HLM. Replace the High Level Mux with
the red (Fault) LED lighted.
M13 SYNC LOSS
Loss of frame for selected DS3 to be
demuxed. Check far-end High Level Mux
and configuration.
MANUAL MUTE
TX power switch on the Transmitter
Assembly is OFF.
On the Transmitter Assembly
faceplate, press the Tx switch to
the ON position.
MODEM ABSENT (A1, A2 /
B1, B2)
Modem card unplugged.
Modem not installed per
configuration.
Defective Modem.
Is the Modem plugged in?
Install Modem.
Replace the Modem. See
Chapter 11 .
MODEM A, B IF LPBK
Modem A or B in loopback mode
(local command only).
Cancel the IF loopback test.
NO ETHERNET ADDRESS
Address not assigned; unique
address provided by Harris.
Return SPU Controller to Harris.
NO IF INPUT
Loss of signal from the Modem to
the Transmitter.
Check the cable connecting the
Modem to the Transmitter. If
the cable is okay, replace the
Modem.
OC3 INPUT LOS
No signal present at transceiver of
HLM-155. Check the input signal from the
external equipment.
Message Explanation
Course of Action/Possible
Causes