Comtech EF Data CRS-400 - Manual (Page 47)

CRS-400 1:8 Redundancy Switch Revision 0
Installation and Setup MN/CRS400.IOM
31
2.13.2 C ONFIGURING AND C ABLING FOR M ULTIPLE T RANSPONDERS ,
U SING THE CRS-280 T RANSPONDER S WITCH
The CRS-280 provides complete isolation of the IF signals. The redundant Mod/Demod
IF signals are routed to the traffic Mod/Demod IF path when the RMI is online.
Once connected, the CRS-400 automatically senses the presence of the CRS-280. The
CRS-400, upon switching, leaves the offline modulator with its RF on, and the CRS-280
switch relays isolate any undesired signals.
1 Connect the CRS-280 to the CRS-400 with a 25-pin control cable.
2 Refer to Table 2-11 for a complete listing of the CRS-280 IF connections.
3 Connect the Transmit and Receive IF of each Mod/Demod to the CRS-280 with the correct IF
cables.
The same IF connections are used between the CRS-280 and all modems as shown in
Table 2-11.
Table 2-11 CRS-280 IF Switch Connections
From CRS-280 To Other To Modulator From CRS-280 To Demodulator
Tx BU - Tx IF, Ch Bu Rx1 Rx IF, Ch1
Tx1 - Tx IF, Ch1 Rx2 Rx IF, Ch1
Tx2 - Tx IF, Ch2 Rx3 Rx IF, Ch2
Tx3 - Tx IF, Ch3 Rx4 Rx IF, Ch3
Tx4 - Tx IF, Ch4 Rx5 Rx IF, Ch4
Tx5 - Tx IF, Ch5 RxBu Rx IF, Ch Bu
Tx6 - Tx IF, Ch6 Rx6 Rx IF, Ch5
Tx7 - Tx IF, Ch7 Rx7 Rx IF, Ch6
Tx8 - Tx IF, Ch8 Rx8 Rx IF, Ch7
Tx9 (Not Used) - - Rx9 (Not Used) -
Tx10 (Not Used) - - Rx10 (Not Used) -
Switch Control
CRS-230
IF Switch Control
- - -
Once the applicable transponder configuration and cabling has been completed, the
switch is ready for the next procedure, Configuring Automatic Operation Mode.