Hughes 9300 Series Installation Guide
ISDN Port
There is one ISDN port on the IDU. It provides 4 kbps voice, 3.1 kHz audio, and 64 kbps
data communication. The following chart depicts the pinout of the ISDN connector.
Pin
1 NC
2 NC
3 ISDN
RX+(+40V)
4 ISDN
TX+(-40V)
5 ISDN
TX-(-40V)
6 ISDN
RX-(+40V)
7 NC
8 NC
Figure 5 – ISDN Port Pinout
RJ11 Ports
There are two RJ11 ports on the IDU: FAX is for 3.1k fax calls, and TEL for 4 kbps
speech calls. The following chart depicts the pinout of the RJ11 connectors.
Pin
1 NC
2 NC
3 Tip
(+V)
4 Ring
(-V)
5 NC
6 NC
Figure 6 – RJ11 Port Pinout
Antenna Port
The antenna port is a 50
Ω
female TNC connector. This line carries the L-band RF, ASK
signaling, and DC power (42 VDC) for the antenna.
WARNING:
The antenna cable carries DC power. Do not connect or disconnect
the antenna cable while the unit is powered on.
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