The intercom master station is composed of a GX 2020 control console and an IZ2020 central unit with its mains power supply.
The system can be used to produce an installation with 20 secondary stations. Four IZ 2020 units can be connected to obtain an installation with 80 stations.
In order to have 2 master stations on the same installation, a second GX 2020 console may be added. An "alternating" operating mode is used, i.e. the master station controls the conversation.

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