EXTENSION CORDLESS TELEPHONE SYSTEM

摘要

PURPOSE:To share one selection signal generating circuit with a master set and a slave set and to prevent mis-dialing by providing a gate circuit between a key switch contact of the master set and a selection signal generating circuit. CONSTITUTION:A gate circuit 13 is provided between a key switch circuit 14 and a selection signal generating circuit 10 of a master set. Then the gate circuit 13 is controlled so that the key switch circuit 14 and the selection signal generating circuit 10 are connected while the master set is in use of a trunk line or the trunk line is busy and the key switching circuit 14 and the selection signal generating circuit 10 are disconnected while the slave set is busy. Thus, even if the key switching circuit 14 of the master set is operated in mistake during the talking of the slave set, the transmission of an erroneous selection signal is prevented.