FAQ/What is the maximum number of m9 base stations that can be used on one site

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DECT is based on 120 channels (or time-slots). As you need two channels for one handset (one for sending one for receiving) you could have in theory 60 handsets running in the same coverage area (30-50m indoor; up to 300m outdoor) From this point of view up to 15 base stations (with 4 concurrent calls per base --> 15 base stations x 4 calls = 60 channels) could be used but as signaling and synchronization also requires channels (timeslots), 7 base stations could be realistic. Base stations should not be placed close to each other (as there might be radio interferences).

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