The CDV-DBC4A BUS distributor is required for systems with multiple door stations (4 door stations max).
When star-wiring 2Easy handsets the CDV-DBC4A is required, using 4 handsets per CDV-DBC4A.
When using CDV47DX monitors on larger systems, you may need to use the CDV-DBC4R. (Please contact CDVI technical support for more information)
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