Comtech EF Data KST-2000A/B - Manual (Page 23)

Ku- Band Satellite Transceiver Revision 9
Introduction MN/KST2000AB.IOM
1–9
1.1.7 Redundant System
A block diagram of a redundant KST-2000A system is shown in Figure 1-5. For the
KST-2000B, LNBs replace the LNAs. The KST-2000A/B contains all the logic and
circuitry to sense the need to switch channels and to drive the RF switches.
The basic operation of the redundant system is identical to the single thread except that
two independent TX and RX channels are provided. Initial selection of TX and RX
channels is via the remote M&C or keypad.
During operation, and when a fault is detected in one channel, an automatic switchover to
the other channel occurs. The RJU-2000 provides IF I/O selection and converter interface
connections.
C0NVERTER UNIT
TX IF
REMOTE
RX IF
TX RF
RX RF
1 : 1
C0NVERTER UNIT
TX IF
REMOTE
RX IF
TX RF
RX RF 1 : 1
HPA
LNA
HPA
LNA
LOAD
TRF
OMT
TX IF
RX IF
REMOTE
M&C
RJU-2000
Figure 1-5. Redundant KST-2000A System Block Diagram