Intercom

A intercom (also called gatekeeper) is a Téléphone which uses an internal network; it is thus not connected to the phone network. The intercom is often equipped with a button allowing the opening of a remote door. That goes from the simple intercom for house to the intercom worked out for the collective apartments. Some are equipped with video, in electrical installation. This electric diagram can be connected towards outside with only two wire or 4 to 6 wire while ordering an electric trowel. The last generations are with two wire and electronic. One sees even compatible data-processing models TCP/IP.

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