Clear-Com CCI-22 - Manual (Page 17)

Vitec Group Communications
CCI-22 Dual Channel Party-Line Interface Instruction Manual 2 - 7
TO CONNECT “RTS” 2-CHANNEL 2-WIRE
PARTY-LINES
Stations on RTS 2-channel 2-wire party lines are connected with
2-conductor shielded cable. One of the two shielded conductors
carries both the DC power and the audio signal for one channel, while
the other conductor carries audio only providing two channels per
cable. The shield is a common ground for both channels. The matrix
can be connected to a 2-channel 2-conductor “RTS” line using the
CCI-22’s two channels. The CCI-22 does not support RTS call signals.
Power to the CCI-22’s channels must be provided by the external party
line. The power connection for each channel is the “+30 VDC Power”
pin on the appropriate DB9-M Interface I/O connector on the
rear-panel assembly. When connected to an RTS system, each
channel’s power input circuit will filter out the audio signal on the RTS
line.
Figure 2-7: Connection Diagram of CCI-22 DB-9 to RTS XLR
Audio is fed to each CCI-22 channel via the “audio” pin on the
appropriate DB9-M Interface I/O connector on the rear-panel
assembly. When connected to an RTS system, each channel’s audio
input circuit will filter out the DC power on the RTS line.
The Clear-Com/RTS pin must be grounded when a CCI-22 party-line
channel is connected to an RTS party line. Leaving this pin floating
selects “Clear-Com” mode, which is incompatible with RTS party lines.
The termination jumper of each CCI-22 channel must be set to “B”
(termination disabled).
CCI-22 channels can be connected to RTS party lines in a variety of
configurations, depending on how the power and grounds are
connected between the party line and the CCI-22 channel. The
following sections describe the options.
CC/RTS
GND Chan-1
+30 VDC Power
Chan-1 AUDIO
NA
CC/RTS
GND Chan-2
+30 VDC Power
Chan-2 AUDIO
1
2
3
4
5
6
7
IMF-3/CCI-22
DB9
RTS-TW
XLR
1
2
3
GND
+VDC/Ch-1 AUDIO
Ch-2 AUDIO