Vitec Group Communications
CCI-22 Dual Channel Party-Line Interface Instruction Manual
2-3
The power pin has a DC filtering circuitry to provide a high impedance
for the audio so the power can be received from a “powered line or TW
line” as is common with RTS systems. For TW operation tie the AUDIO
and POWER pins together.
Each party-line channel requires exactly one termination circuit. The
termination circuit is usually built into the system component providing
the party-line’s power. Connecting more than one termination circuit to
a party-line will impair the null and degrade the line’s audio quality.
When a CCI-22 party-line channel is connected to a Clear-Com
party-line, the Clear-Com/Other Select pin must be left floating.
Grounding this pin selects the RTS mode, which is incompatible with
Clear-Com party-lines.
TWO SEPARATE PARTY LINES
The diagram in Figure 2-2 shows the CCI-22’s two channels
connecting two independent external party lines to the matrix. Each
external party line provides its own power and termination. The wiring
diagrams in Figure 2-3 and Figure 2-4 show an external switch on the
Clear-Com/Other Select pin; this switch allows the CCI-22 channel to
be used on either Clear-Com or RTS party-lines.
In the wiring diagram in Figure 2-3, all connections to the CCI-22 are
made using only one of the CCI-22’s two parallel DB-9M connectors.
The wiring diagram in Figure 2-4 shows the same connections as
Figure 2-3, except that each DB-9M connector is wired separately. Use
the wiring method that is most convenient for the installation.
Figure 2-2: Two External Party-Lines Connected to the CCI-22
CCI-22
Matrix
Clear-Com
Power Supply
w/ Termination
Beltpack Beltpack Beltpack
Clear-Com
Power Supply
w/ Termination
Beltpack Beltpack Beltpack
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