Comtech EF Data RCS20 - Manual (Page 32)

RCS20 M:N Redundancy Switch Revision 15
Theory of Operation MN-RCS20 and CD-RCS20
3–2
3.2.4 Clock Distribution Module (Optional)
Consult factory for availability. See Section 5.2.3.1.
3.2.5 Redundant Power Supplies
The M:N Switch comes equipped with two fully redundant internal power supplies (PS1 and PS2) that
supply DC voltage to the system. Each supply is fully independent of the other, including their source of
AC power and fusing.
The Switch can remain fully operational as long as it is supplied with a source of voltage from either
power supply. Only if the voltage output failed on both supplies would the Switch become inoperative.
PS1 and PS2 are located one on either side of the RCS20.
3.2.6 Ethernet Module (Optional)
Consult factory for availability.
3.2.7 Bank Control Module
The Bank Control Module provides connection to auxiliary equipment. See Section 5.2.3.3.
3.2.8 RCU20 Back Panel
Tthe RCS20 contains the plug-in slots for the Interface Control Module, the Clock Distribution Modules,
Bank Control Modules and Ethernet modules. Also contained in the back panel are the two AC fuses and
power receptacles.
3.3 IFS20 Major Assemblies
The IFS20 IF Switch interfaces the IF signals of the Modems with the earth station IF system and
provides backup switching. The unit provides all of the switching relays, signal combiners and splitters,
terminations and interconnecting cables that are necessary to connect any combination of up to eight
Modulators and Demodulators to eight independent uplink and eight independent downlink transponders.
The IFS20 has no internal power supply. It receives its DC power from the RCU20 through the cable that
connects to J35. The IFS20 internal connectors are SMB-type. The major parts of the IFS20 are:
• IF Switch Relays (eight uplink, and eight downlink).
• Back Panel/Front Panel