Comtech EF Data CRS-400 - Manual (Page 46)

CRS-400 1:8 Redundancy Switch Revision 0
Installation and Setup MN/CRS400.IOM
30
Notes: Use the INFO and MONITOR menus to view the status of the mods/demods, in addition
to viewing the LEDs.
Use MONITOR: COMM-STATE to verify the devices that are responding via remote
control.
The switch is now ready for the next procedure, Configuring the IF Carriers.
2.13 C ONFIGURING THE IF C ARRIERS
Next, configure the IF carriers for all the Mods/Demods. There are two configuration
methods: single transponder and multiple transponders.
For a single transponder, all the Mods/Demods are connected to the same up/down
converter.
For multiple transponders, the Mods/Demods may be grouped and connected in various
combinations to multiple up/down converters. The CRS-280 IF Switch is required for
multiple transponder operation.
Proceed with the transponder configuration method applicable to your system.
2.13.1 C
ONFIGURING AND
C
ABLING FOR A
S
INGLE
T
RANSPONDER
2.13.1.1 T RANSMIT S IDE
1 Configure each Modulator’s transmit settings to the proper data rate, IF frequency and output
power level.
2 Combine the carriers (with user-supplied BNC cables) into a single power combiner.
3 Feed the output of the combiner to the up converter.
IMPORTANT
Ensure that the impedance for the Mods/Demods’ cables and combiner are the
same to prevent problems resulting from a mismatch.
2.13.1.2 R
ECEIVE
S
IDE
1 Attach the output of the down converter (with user-supplied BNC cables) to a single splitter.
2 Feed the output of the splitter into the Receive IF ports of the Demodulators.
When a traffic Modulator is taken offline, its Transmit IF shuts down automatically and
is replaced by the redundant Modulator IF.