Installation of the BDU
98-175666-D Chapter 2: Installation 2-29
RS-232 RJ-45 connector
Use the following connector to connect the BDU to the VSAT modem.
RS-422 RJ-45 connector
Use the following connector to connect the BDU to the VSAT modem.
Outline Pin I/O Signal Function
1 I RSSI 2 CM temp out of range
2 I DTR/Rx Lock CM power good
3 I RXD BUC TXD
4 - GND Ground
5 - GND -
6 O TXD BUC RXD
7 I DSR/TX Mute GMU reset
8 I RSSI 1 CM RSSI
Shield - PCB ground PCB ground
Table 2-17: RJ-45 RS-232 connector, male, outline and pin assignment
Outline Pin Signal Pin function
1 Line A RXD (+) Receive data (non-
inverting)
2 Line A RXD (-) Receive data (inverting)
3 Line B TXD (+) Transmit data (non-
inverting)
4 GND Ground
5 GND Ground
6 Line B TXD (-) Transmit data (inverting)
7 BUC Key line (+) Key line (non-inverting)
8 BUC Key line (-) Key line (inverting)
Shield PCB ground PCB ground
Table 2-18: RJ-45 RS-422 connector, male, outline and pin assignment