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Four-wire intercom systems require one cable for intercom A and one cable for intercom B in order to interface two channels of four-wire intercom to the base station.
This interfacing is done through the intercom A and B RJ-45 type jacks on the rear of the unit.
The send(Tx) and the receive(Rx) is connected to the intercoms 4-wire input via an RJ45 connector
for interfacing with RTS Matrix and modern digital matrix intercom system.
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FreeSpeak Basestation 4-wire Pinout from RJ45 port is
Pin 3,6 : Audio Out + - pair
Pin 4,5 : Audio In + - pair
Clearcom DX410 pinout rj45 is same above
this cable is enable bidirectional use
Solid wire and Semi-flexible
Please reference Manual document for setup the configuration software
PLEASE DON'T CONNECT 2WIRE CABLE INCLUDE DC VOLTAGE DIRECTLY.