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C700 - Marine Satellite Communication System
4.2 System Package
4.2.1 Above Deck Unit (ADU)
The Above Deck Unit (ADU) is an antenna unit with 12-element patch antenna, active RF switch circuitry,
BCX (L-band modem), and GNSS circuit. The radome protects the antenna unit from a severe marine
environment. All signals (and DC power) shall pass through a single coaxial antenna cable, which connects
the ADU to the BDU.
Figure 4: 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 5: Below Deck Unit (BDU)
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