Digital key telephone connection device and method in digital key telephone system

摘要

In the digital key telephone system, the configuration and the method of using the digital transmission method of 2B + D in using the digital key telephone, and the method of using the B1 or B2 channel in the master phone can be controlled by the master phone, respectively By adding a transmission unit to the additional module, the B2 channel can be separated and freely used so as not to be distant from the distance, so that another digital keyphone device or a data transmission device can be connected.