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Installation
2.2 Site Considerations
Adequate site planning and preparation simplifies the installation process and results in a more
reliable system. The user should ensure that the site has adequate electrical power, environmental
controls and protection against sources of electrical radiation and interference.
2.2.1 Power Sources
The power sources should be properly grounded and as free as possible from electrical interference.
If a redundant configuration is to be used, then each power cord on the RCS20 must be plugged into
its own separate power circuit. Each circuit must have its own independent circuit breaker.
Grounding is achieved automatically when the three-prong power plug is inserted into a power
receptacle. Verify by testing that there is no voltage present between the chassis of the Switch and
the power line ground.
The protective ground must not be bypassed with a three prong to
two-prong adapter or defeated in any way. Defeating the ground may
result in operator injury or damage to the system.
2.3 Rack Mounting
The RCS20 is designed so that it can be mounted in a standard 19-inch rack. The RCS20 is 5¼", 3
Rack Units (RU) high and must be mounted on the front of a rack with the front panel facing forward
as shown in Figure 1-1.
The DDS20 is 8¾" (5 RU) high and is preferably mounted at the top of a rack unit with the Terrestrial
Interface connectors available at the top of the rack and the modem connections available at the at
the bottom of the DDU20 in the interior of the rack. The DDS20 may also be mounted at the rear of
a rack with the Terrestrial Interface connectors available at the rear of the rack and the modem
connections available in the interior of the rack.
The IFS20A is also 8¾" (5 RU) high and is designed to be mounted at the rear of a rack with the
Up/Downconverter interface connections facing to the rear of the rack with the modem IF
connections available in the interior of the rack. The IFS20A may also be mounted in the top of a
rack with the Up/Downconverter interface connections available at the top of the rack and the
modem IF connections available inside the rack.
To allow for the easy installation of cables and adequate air circulation through the units, a
minimum of six of clearance must be provided at the sides and rear of the units. In addition, the
RCS20 requires a minimum of 1¾" (1 RU) of clearance on top of the unit.
If the Switch is mounted on slide mounts, the cables must be of sufficient length to allow the units
to be pulled forward on the mounts.
2-2
RCS20 M:N Redundancy Switch
TM056 - Rev. 2.3
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