JPH02202137A - Switching system for digital transmission line - Google Patents

Abstract

PURPOSE:To prevent digital information from being missed due to the switching of a digital transmission line by outputting the digital information which takes majority logic out of the digital information sent via the digital transmission lines of three or more odd systems. CONSTITUTION:It is assumed that the digital information (a) of each system transmitted via the digital transmission line 3 is deformed to the digital information (a1) due to the defective state of the digital transmission line of one system at the time of reception at a phase arranging circuit 4. Firstly, phase arrangement of the digital information (a) and (a1) of three systems received at the phase arrangement circuit 4, respectively are performed by a synchronizing signal, and after that, the processings of the majority logic for the digital information (a) and (a1) of the three systems are performed at a majority circuit 5, and finally, the digital information (a) of majority as a result is outputted to an output terminal 6. In such a way, it is possible to prevent the digital transmission line from being hit at the time of switching the line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switching system for digital transmission lines, and more particularly to a switching system for digital transmission lines having a plurality of systems.

[Conventional technology]

Conventionally, this type of digital transmission line switching system has two
A switching device was installed on the receiving side for the digital transmission line of the system, and the switching system used digital information from one of the two systems.

[Problem to be solved by the invention]

The conventional digital transmission line switching system described above has two
Since one of the digital transmission lines of the system is output using a switch, there is a drawback that the digital transmission line is momentarily interrupted when switching.

[Means to solve the problem]

The digital transmission path switching system of the present invention includes: - transmission means for simultaneously transmitting digital information to each of three or more odd-numbered systems of digital transmission paths; and an output means for performing majority logic on the received digital information and outputting majority-ruled digital information from among the received digital information.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, this embodiment includes a distributor 2 that transmits digital information received via an input signal terminal 1 to three digital transmission lines 3 almost simultaneously, and a digital It has a phase matching circuit 4 that receives information and performs phase matching, and a majority decision circuit 5 that takes the majority logic of the three systems of phase-matched digital information and outputs the digital information on the majority decision side to the output signal terminal 6. It is configured as follows.

Next, the operation of this embodiment will be explained.

The distributor 2, which has received the digital information a via the input signal terminal 1, transmits the digital information a to each of the three digital transmission lines 3.

It is assumed that the digital information a of each system transmitted via the digital transmission path 3 is transformed into digital information a1 at the time of reception by the phase matching circuit 4 because one system of the digital transmission path 3 is in poor condition.

First, the phase matching circuit 4 performs phase matching on the digital information a and al of the three channels that are not received using a synchronizing signal, and then the majority logic processing of the digital information a and al of the three channels is performed in the majority decision circuit 5. As a result, the majority-voted digital information a is output to the output signal terminal 6.

〔Effect of the invention〕

As explained above, the present invention outputs digital information obtained by taking the majority logic out of the digital information transmitted through three or more odd-numbered digital transmission lines, so that it can be transmitted without interruption. Since the digital transmission path is switched, there is no loss of digital information due to switching of the digital transmission path as in the conventional method, and the reliability of digital information transmission can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Input signal terminal, 2... Distributor, 3... Digital transmission path, 4... Phase matching circuit, 5... Majority circuit, 6... Output signal terminal.

Claims (1)

[Claims] A transmission means for simultaneously transmitting one digital information to each of three or more odd-numbered digital transmission lines, and a transmission means that receives the transmitted digital information of the odd-numbered systems, matches the phase, takes majority logic, and receives it. 1. A switching system for a digital transmission path, comprising: output means for outputting majority-voted digital information from among digital information.