Clear-Com RCS-2700 - Manual (Page 23)

R C S - 2 7 0 0 S O U R C E A S S I G N M E N T P A N E L 2 - 3
A station without an internal power supply can still serve as a source station if an
external power supply is added. For example, Clear-Com’s RM-702 2-channel
remote station can serve as a source station if you add PS-702 (2-channel) or
PS-704 (4-channel) power supplies.
If expansion RCS-2700 units are added, the main unit and all expansion units
must be powered by the same channel on the same power supply so that the main
unit can correctly determine the size and configuration of the entire system.
Destinations can be powered from the power patch panel on the RCS-2700 or
from external power supplies. Power from pin 2 of each source channel is
connected internally to the respective “Source Power” connection in the power
power patch area. Destination power connections for each destination are
connected internally to pin 2 of the respective destination connections.
The connection scheme is very flexible, so there are a number of ways that power
can be patched. Strategies for providing power to the RCS-2700 main unit,
expansion units, and destinations are discussed in the following sections.
Powering from Multiple Party-Line Source Channels
Figure 2-2 shows how multiple source channels can power the RCS-2700 unit
and all connected remote destinations.
Each source channel powers three destinations. Power from the first source
channel powers the RCS-2700 unit and destinations 1, 2, and 3; power from the
second source channel powers destinations 4, 5, and 6; and so on through the
eighth source channel which powers destinations 22, 23 and 24.
The advantage of this connection strategy is that if the power for one destination
is shorted, it will only affect two others, assuming that the eight source power
channels are individually short protected.
When power is monitored with the RCU-67 Remote Control Unit or with the
PC, it will be possible to more closely detect which destination's power is shorted
because the short can be isolated to one of eight groups of destinations.
Figure 2-2: Powering the RCS-2700 from Multiple Source Channels
Powering from One Party-Line Source Channel
Figure 2-3 shows how power from one channel of the source intercom station
can power the RCS-2700 unit and all connected remote destinations.
• The data cables between
expansion units should
not exceed 6 feet (2
meters) each.