key telephone system, a series of special type of circuit to the circuit.

摘要

key telephone system, the module of key words from 1 ~ n the professional group on the other. the serial transmission line number for the circuit, the time switch in a key words from the control tower. in order to control the transfer of ucf58ud2b8, address, data bus and. results from the time switch and the frame synchronizing signal, the clock, the first transceiver is connected to the control module, the key words in the past 1 - n series with specific channel through the professional group on the day. the transmission module of the circuit composed of the ud398uc774.