FB250/Fleet One - Marine Satellite Communication System
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4.2 System Package
4.2.1 Above Deck Unit (ADU) / Antenna Unit
The Above Deck Unit (ADU) consists of a medium-size maritime 2-axis stabilized BGAN antenna, active RF
switch, BRM, and GNSS circuit.
The antenna unit is protected from a severe marine environment by a radome. The ADU and BDU are
connected by a single coaxial cable which delivers RF signals and DC power.
Figure 3: Above Deck Unit (ADU) / Antenna Unit
4.2.2 Below Deck Unit (BDU)
The Below Deck Unit (BDU) supports voice and data communications in a marine environment. The BDU
is the main control unit of an antenna system that monitors and controls the antenna operation through
Intellian’s web-based software. The BDU contains user interfaces and controls all communication between
the ADU and the local communication devices such as phones, and computers, etc.
Figure 4: Below Deck Unit (BDU)
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