Changers such as the Fermax automatic changer 8812 are required in installations with more than one access. Its function is to connect the telephone or monitor of the house with the plate from where the call is being made.
The changer 8812 supports a maximum of 7 accesses and 1 changer is required per doorman / video entry. Only in case of 2 accesses is 1 changer required.
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