| 摘要 |
PURPOSE:To simplify a common control system by realizing a trunk circuit without requiring a special connection switching device, by connecting and switching a common line signal circuit through a time-division channel. CONSTITUTION:Since a common line signal circuit is connected to a trunk circuit TRKO, an accepted common line signal arrives through a bus connected fixedly by a time-division channel TDSW and is passed through a trunk circuit TRK1 and a modulator and demodulator MOD; and it is edited by a common line controller CSC and transferred to a central processor CPU. Reversely, a common line signal transmitted from the central processor CPU is sent to the common line signal circuit through the common controller SCS, modulator and demodulator MOD, trunk circuit TRK1, time-division channel TDSW, and trunk circuit TRKO. |
