Comtech EF Data CRS-100 - Manual (Page 20)

CRS-100 1:1 Redundancy Switch Revision 2
Introduction MN/CRS100.IOM
2–4
The following cable assemblies are supplied with the CRS-100 as shown in Figure 2-1 :
Quantity 1, Comtech EF Data P/N CA/WR0055 (Auxiliary Serial Cable)
Quantity 2, Comtech EF Data P/N CA/WR0056 (Universal Data Interface Cable) And:
Quantity 4, Comtech EF Data P/N CA/BNC 75
Ω ( 75Ω IF Cable) or:
Quantity 4, Comtech EF Data P/N CA/BNC 50 Ω ( 50Ω IF Cable)
The CRS-100 is designed to work equally well with either 50 or 75
Ω systems, and Users
should ensure that they order the correct IF cable sets when placing their order with the
Factory.
WARNING
It is extremely important to designate the two Modems as the ‘A’ Unit and
the ‘B’ unit. When two units are stacked together, the top unit will be ‘A’,
and the bottom unit will be ‘B’.
It is essential to ensure that the IF connections, both Rx and Tx, are made correctly, i.e.
the Tx IF from Unit ‘A’ connects to the Tx IF port ‘A’ on the CRS-100, and Unit ‘B’ to
‘B’, and the same for the Rx IF connections. Failure to observe this requirement will
result in the system malfunctioning.
IMPORTANT
When connecting the Universal Data Interface cable between the
CRS-100 and the modems, please ensure that screw locks on the ‘D’
type connectors are securely fastened. This will prevent the accidental
un-mating of the cable, particularly when a Standby unit is being
removed or replaced.