JPH0480149U

JPH0480149U -

Info

Publication number: JPH0480149U
Application number: JP12302490U
Authority: JP
Priority date: 1990-11-23
Filing date: 1990-11-23
Publication date: 1992-07-13

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を含むシステムのブ
ロツク構成図、第２図は本考案の一実施例を示す
回路ブロツク構成図、第３図は本考案の動作タイ
ミングチヤートである。１……回線切替部、２……データ有信号検出部
、３……保持回路部、４……受信データ制御部、
５……遅延時間監視タイマ、６……現用切替信号
、７……予備切替信号、８……現用切替制御信号
、９……予備切替制御信号、１０……切替遅延信
号、１１……送信局、１２〜１４……受信局。 FIG. 1 is a block configuration diagram of a system including an embodiment of the present invention, FIG. 2 is a circuit block diagram showing an embodiment of the present invention, and FIG. 3 is an operation timing chart of the present invention. 1... Line switching unit, 2... Data presence signal detection unit, 3... Holding circuit unit, 4... Received data control unit,
5... Delay time monitoring timer, 6... Working switching signal, 7... Standby switching signal, 8... Working switching control signal, 9... Standby switching control signal, 10... Switching delay signal, 11... Transmitting station , 12-14...receiving stations.

Claims

[Scope of Claim for Utility Model Registration] (1) In a double loopback communication line switching circuit, a detection output is generated when either or both of the working data presence signal and the protection data presence signal are input. A data signal detection means, a delay time monitoring timer that is activated by the output of the data signal detection means and monitors the delay time, and a switch that is output when the monitoring timer reaches a preset delay time. a working line activated by a delayed signal to switch from a working line to a protection line;
1. A communication line switching circuit comprising a protection line switching means and a received data control means for switching and controlling data from working data to protection data based on the output of the line switching means. (2) The working/protection line switching means includes an exclusive OR circuit into which the working data present signal and the backup data present signal are input, and an output of the exclusive OR circuit, the working data present signal, and the switching delay. a first AND circuit that receives the signal as input; a second AND circuit that receives the output of the exclusive OR circuit, the preliminary data presence signal, and the switching delay signal; 2. The communication line switching circuit according to claim 1, further comprising a holding circuit whose input is the output of the AND circuit.