9–1
Chapter 9. External Amplifier
Communication
(+10 dBm Transceiver Only)
This chapter describes items particular to the +10 dBm unit.
9.1 Overview
The +10 dBm XSAT Transceiver provides an additional connector (J8) to ease communications
with an external amplifier. This connector passes the RS-485 serial communication signals to the
external amplifier. It also connects the fault relay of the external HPA to the XSAT redundant
controller system. This allows the system to recognize a fault of the external HPA and drive the
redundant switching appropriately.
The downconversion side of the transceiver operates the same as the standard XSAT.
9.2 External Amplifier Communication
The J8 connector allows a single cable interface between the XSAT and the external HPA.
Refer to the following table for connector pinouts. The RS-485 connections are parallelled with
the RS-485 connections on the XSAT’s standard M and C connection. This allows the customers
M&C to transmit and receive commands from the external HPA.
If the XSAT detects an open between pin F and pin G, it will generate a fault and the data will
be acted upon by the redundant controller.
