PERIPHERY CONTROL SYSTEM IN ELECTRONIC EXCHANGES

摘要

The method is for matching the telephony device bus of the electronic telephone exchanger. The telephone device bus with compatibitity and expandability provides various selection modes and access points to control the telephone device having different functions in common. The data transmission is performed by RS485 type differential serial method adapting the multipoint topology. The telephony device bus also control the devices departed in long distance by changing the clock rate.