Doc.No.: 03118-000
-DE
Page 12 of 16
5. REDUNDANCY
I
n a PA/GA system as the MPA 1600 the design and the installation must be carried out in a way that
the damage of one single failure shall be minimised as far as possible.
In the MPA 1600 such redundancy is achieved by the following measures:
5.1. CENTRAL EQUIPMENT
- All centralized equipment (MPA 1600, Amplifiers etc) is duplicated and physically separated
in different fire zones – System A and B. Ref document. 03118-100-BD and 03118-100-EC.
- The A and B central equipment are connected together with a synchronisation link to
coordinate alarm tone generation and other timing-related functionality. If this synchronisation
link is somehow broken or damaged the systems will work individually.
- The MPA 1601 and 1604, Control Units and MPA 1603, Alarm Panel, are equipped with a
duplicated interface for connection to both systems (A and B). The connection status is
displayed in the System A / B led indicator of the MPA 1601 and 1604.
5.2. LOUDSPEAKER DISTRIBUTION NETWORK
- The loudspeaker distribution network is duplicated and routed separately in different cable
ducts and as physically separated as possible.
- All public areas shall be covered equally from both loudspeaker distribution network.
- All cabins shall be supplied with PA/GA loudspeakers. Minimum requirement is that
neighbouring cabins shall be supplied from different loudspeaker distribution network.
5.3. ALARM PANEL
In order to have a required redundancy and availability to the General alarm the minimum amount of
MPA 1603 Alarm Panels is two (Alternatively 1605/1606/1643). One shall always be placed on the
Navigation Bridge. At least one more shall be placed in another strategic place as
an alternative
position.
5.4. CONTROL UNIT
In order to have a required redundancy and availability to the Emergency PA, the minimum amount of
MPA 1601 Control Units is two (Alternatively 1605/1606/1643). One shall always be placed on the
Navigation Bridge. At least one more shall be placed in another strategic place as
an alternative
position and where it is deemed necessary.
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