PRIVATE BRANCH RADIO COMMUNICATION SYSTEM

PURPOSE:To attain quick and economical operation and construction of the titled system by performing the radio transmission of a collision detecting signal and the signal transferred between a coaxial bus line and a terminal equipment in a CSMA/CD system private branch network. CONSTITUTION:The signal produced from a terminal device 14a is supplied to a transmitter 17a within the 2nd radio equipment 16a. The carrier wave of the transmitter 17a is modulated and sent to the 1st radio equipment 15 through an antenna 18 in the form of a transmission frequency fA. the signal supplied to the equipment 15 through an antenna 19 is demodulated by a receiver 22 after passing through a branching filter 21a and delivered to a coaxial bus line 11 from a signal processing circuit 23. The signal flowing on the line 11 is detected by the circuit 23 of the equipment 15 and supplied to a transmitter 24. Then the carrier wave is modulated by the signal supplied to a transmitter 24. This modulated output passes through a branching filter 25 and is transmitted to two 2nd radio equipments 16a and 16b through the antenna 19 with a transmission frequency fR.