Specifications

68
8.2.3
AIS Alarms
The AIS Alarm is triggered if a failure is detected in one or more of the AIS functions or data. The corresponding
message is given in
table below. The most probable source of error and corresponding system behavior is described
together with some notes on troubleshooting the error.
Alarm
ID
Description Cause / Source of error
Reaction of the s ystem and user
advise
001 Tx malfunction VHF Antenna or cabling
mismatch. Alternatively
Invalid MMSI
The Transponder stops transmission.
Check the antenna cabling for short or open circuits.
Alternatively check the VHF antenna. Check that the
MMSI number is correct.
002 Antenna VSW R
(Voltage Standing
Wave Ratio)
exceeds limit
VHF antenna or installation
The Transponder continues transmission. Check
the VHF antenna and the cabling.
Make sure the cables are 50 Ohm.
003 Rx channel 1
malfunction
Internal frequency error* The Transponder stops transmission on the affected
channel.
Try rebooting the system.
Alternatively, service is needed.
004 Rx channel 2
malfunction
Internal frequency error* The Transponder stops transmission on the affected
channel.
Try rebooting the system.
Alternatively, service is needed.
005
Rx channel 70
malfunction
Internal frequency error* The Transponder continues normal transmission but
is not able to receive DSC messages.
Try rebooting the system.
Alternatively, service is needed.
006 General failure Missing MMSI, internal error The Transponder stops transmission. Check
MMSI and the other parameters.
007 UTC sync invalid GPS antenna or installation The Transponder continues operation using indirect
or semaphore synchronization with other AIS units.
If the received GPS signal strength is low, the GPS
might use some time to get the first fix. Consider
waiting 15 minutes.
Check the GPS antenna and cabling.
If the antenna is an active type, check that the
phantom DC voltage is correct.
008 MKD connection
lost
Connection between the Display
Unit and the Transponder is
corrupted
The Transponder continues operation, and alerts
other AIS systems that no display is present.
Check that the display is turned on.
Check cable connection in both ends.