SAILOR XTR GX-R2 system
98-175666-D Chapter 1: Introduction 1-8
1.1.2 Below Deck Unit (BDU)
The BDU contains all user interfaces and manages all communication between the
ADU and the connected VSAT modem, a connected PC and an optional
FleetBroadband service communication line. The BDU comes in a 19” rack version, it
has a display, status LEDs and a keypad. It provides a DHCP server and client mode.
The BDU provides DC power to the ADU through a single coaxial cable. The BDU has
the following interfaces:
The BDU has a an On/Off power switch and a LAN connector at the front for accessing
the service port. The unit is AC powered.
Figure 1-7: BDU, connector overview
BDU connector ID Type Function
NMEA0183 RJ-45 Vessel gyro input
GPIO RJ-45 General Purpose I/O
LAN 1 RJ-45 VSAT modem
LAN 2 RJ-45 User LAN
LAN 3 RJ-45 User LAN
LAN 4 RJ-45 User LAN
RS-232 RJ-45 VSAT modem serial interface
RS-422 RJ-45 VSAT modem serial interface
TX In F VSAT modem TX (75 Ohm)
RX Out F VSAT modem RX (75 Ohm)
Antenna N ADU signal and power (50 Ohm)
LAN RJ45 Front LAN service port (LAN 5)
Table 1-1: BDU connectors
Figure 1-8: BDU front panel
On/Off switch
Service port