Comtech EF Data CRS-400 - Manual (Page 30)

CRS-400 1:8 Redundancy Switch Revision 0
Installation and Setup MN/CRS400.IOM
14
2.3.1 D ATA C ONNECTORS
The Data connectors on the TMI plug-ins lead to/from the mods/demods, and lead
to/from the outside world (User Data).
The User Data female connector can be treated as an extension of the traffic
mod/demod’s Data connector. The RMI has no User Data connector, since it will only
replace one of the traffic mods/demods. The pinout for both connectors is provided in the
next chapter.
Open Collector TTL (OC-TTL) signals for mod/demod faults are used to initiate
switching in the CRS-400 switch. The conductors are either in the data cable or in a
separate cable, depending upon the type of data interface.
Note: It is the user’s responsibility to provide the appropriate User Data cable to connect
between the outside user equipment and the TMI.
Reliable Data cables are available from Comtech EF Data to connect between the TMI
(or RMI) and the Mod (or Demod).
2.4 M OUNTING I NSTRUCTIONS
The CRS-400 is constructed as a 4U high rack-mounting chassis. Rack-handles at the
front of the unit facilitate removal from and placement into a rack.
Mount the switch in the rack using the mounting holes on the front panel.
WARNING
DO NOT MIX MODELS OF MODS/DEMODS CONNECTED TO THE SWITCH
For the CRS-400 to operate correctly, identical types of Mod/Demod models must be
used for all traffic Mods/Demods, and for the redundant Mod/Demod.
2.4.1 P ROVIDE A IRFLOW
Typically, the CRS-400 is mounted in a rack along with all the Mods/Demods with which
it is to operate, so it is important to ensure that there is adequate clearance for ventilation.
Since the switch itself is relatively passive, no additional clearance is needed between it
and the nearest Mod/Demod.
In rack systems where there is high heat dissipation, provide forced-air cooling by
installing top- or bottom-mounted fans or blowers.