82695
_Op&Ins MAN_TR2600_K 3-6
3.4
Redundant system
A Base station can be built up as a redundant system with two transponders with separate GPS
antennas for each transponder, an ACU (antenna changeover unit), and a UPS supply.
See paragraph 2.6.2 for redundant power of the AIS BS.
The software to support a redundancy solution is implemented in the transponder units, and the
solution does not require any hardware modifications.
The figure shown below shows the required signals between the main and standby Ais BS and the
ACU.
Figure 3.4, The signals required in a redundancy solution.
The main and standby units must be configured identical via the PI (Presentation Interface). It is
important that the standby unit is correctly configured when it takes over as main. The ACU will
control which unit to become main or standby by the “Master select” signal.
If the main station is broken, the standby station automatically become main. The condition for
when the main unit is considered as broken is when an alarm occurs – and the alarm relay is set.
The main unit will then send a TXT message over the PI, which indicate that the unit is in standby
mode (TXT 43). The ACU will then “select” the standby unit as main.
Status of a unit, whether it is main or standby, can be checked via MMI. The TXT message sent for
the standby unit will create a message under Menu: “Diagnostic->System Indicators”.
See paragraph 7.5 for wiring.
MAIN
AIS BS
STAND
BY
AIS BS
ANTENNA
CHANGE
OVER
UNIT
Alarm / main
Alarm / standby
Backup / select main
Backup / select standby
Summary of Contents for TR-2600
Page 1: ...OPERATION AND INSTALLATION MANUAL www jotron com TR 2600 AIS BASE STATION...
Page 53: ...82695_Op Ins MAN_TR2600_K 10 1 10 OUTLINE DRAWINGS 10 1 TR 2600 AIS BASE STATION...
Page 54: ...82695_Op Ins MAN_TR2600_K 10 2 10 2 TR 2600 AIS Transponder...
Page 55: ...82695_Op Ins MAN_TR2600_K 10 3 10 3 Procom CXL 2 1 l Maritime VHF Antenna with FLG Bracket...
Page 56: ...82695_Op Ins MAN_TR2600_K 10 4 10 4 Procom GPS 4 Antenna...
Page 61: ...82695_Op Ins MAN_TR2600_K 11 2...
