User's Manual

FX500R / FX 500 / FX250 Installation cum Operation Manual

Page 12 of 43

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1.3 Below Deck Unit

The BDU is the heart unit of the FBB UE. It has several interface ports and handles all communication

links between the ADU, primary handset and the local communication devices such as analog

telephone, computer, network equipment, navigation equipment etc.

( FX 500 and FX 250 BDUs are similar).

The BDU is supplied by +12V or +24V DC power supply and it supplies a step-up voltage of 40V ~ 43V

DC to the ADU via a single RF / coaxial antenna cable.

For 19”Rack Mounted BDU, it is supplied by 110V / 230V AC power. Depending the AC Input, the fuse

must be used correctly. For 110V AC, use Fuse T6.3A and for 230V AC, use Fuse 3.15A.

1.4 Wired Primary Handset with Cradle

The wired Primary Handset has a colour liquid crystal display (LCD) and keypad for making

and receiving normal voice calls and sending SMS, which both are similar as any mobile

phone. The handset is provided with a cradle.

Additionally, it can serve as a remote access for an user to access various configuration

supported by the BDU.