Clear-Com Eclipse-Omega - Manual (Page 52)

Clear-Com Communication Systems
Eclipse Matrix Installation Instruction Manual
4 - 2 2
Figure 4-15: Pinout of the DB-9M Interface I/O Connectors for CCI-22
Clear-Com Party Lines General Discussion
Stations on Clear-Com party lines connect to each other with
two-conductor shielded microphone cable. One conductor carries the
DC power (28 to 30 V) for that channel, while the other conductor
carries the duplex two-way intercom audio signal plus DC “Call Light”
signaling for that channel. The shield acts as common ground for both
power and signal for the channel.
Power to the CCI-22 interface channels must be provided by the
external party line. The power connection for each channel is the “+30
VDC Power” pin on the appropriate DB-9M interface I/O connector on
the rear-panel assembly. The CCI-22 channel is essentially just
another “beltpack” on the party line.
The power pin has DC filtering circuitry that provides a high impedance
for the audio such that 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 that
provides the party line’s power. Connecting more than one termination
circuit to a party line will impair the sidetone 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/RTS “select” pin must be left floating. Grounding
this pin selects the RTS mode, which is incompatible with Clear-Com
party lines.
TEL-14 TELEPHONE INTERFACE WIRING
The TEL-14 telephone interface connects two telephone lines to the
matrix. The interface can establish IFB connections between the main
intercom and remote production trucks, can link intercom
communication between remote systems, and can enable telephone
6
7
8
9
1
2
3
4
5
Channel 2 Channel 1
CC/RTS
Ground
+30 VDC Power
Audio
CC/RTS
Ground
+30 VDC Power
Audio