JPS6328151A - Switching device for multiple loop transmission system - Google Patents

Abstract

PURPOSE: To inexpensively constitute a multiple loop transmission system, by always supplying data to the reception terminal of a communication equipment through an OR circuit, and also, connecting each transmission line at a transmission side to the transmission terminal of the communication equipment through a second and a first switches in a transmission mode. CONSTITUTION:A reception data from each of the transmission lines AR and BR at the reception side is supplied to the reception terminal R of an SR12 through an OR gate 21 regardless the kinds of modes, then reception is performed. Meanwhile, in a reception mode P, each transmission line AR and BR at the reception side is connected to each corresponding transmission line As and Bs at a transmission side through an SW23, and through relaying is performed. Also, in a transmission mode T, each transmission line AS and BS at the transmission side is connected to the transmission terminal S of the SR12 through an SW22 by the reaction of the SW23, and selection to which transmission line As or Ds at the transmission side should be connected the transmission terminal S, can be performed freely corresponding to the control status of the SW22. In this way, it is possible to perform the setting of the relay, the reception, and the transmission mode, and also, the selection of the transmission lines A and B can be performed freely, and an inexpensive SWE2 with simplified constitution can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switching device used in a multiple loop transmission system.

[Conventional technology]

Multi-loop transmission systems are used to transmit various types of data that require high reliability, and connect multiple communication devices in a series of loops through multiple transmission paths, each transmitting data in a fixed direction. However, for example, data is normally transmitted through one of the transmission paths, and if a failure occurs in this, another transmission path is selected and data transmission continues normally using the transmission path. It's showing.

In addition, in a loop transmission system, each communication device does not transmit at the same time, but the one that has the transmission right mainly transmits, other communication devices receive this, and take over the transmission right when the transmission ends. Correspondingly, each communication device is set to either a transmit mode or a receive mode, and in the receive mode it only performs reception, and in the transmit mode it only uses the transmission path. It connects its own transmitting end to the terminal and performs transmission.

For this reason, in conventional multiple loop transmission systems, a transmitting/receiving section is inserted into each transmission path at each communication point, and a switching section is inserted between these receiving outputs and transmitting inputs and each communication device. Means such as inserting a switch and controlling the switch according to each mode of transmission and reception and the selection of the transmission path is used.

[Problem that the invention seeks to solve]

However, in the past, multiple transmitting/receiving units were required for each communication point, and separate switches were required between the transmitting and receiving ends of the communication device and each transmitting/receiving unit, making the configuration complex and expensive. points are occurring.

[Means for solving problems]

In order to solve the above-mentioned problem, the present invention is constructed by the following means.

That is, in the above-mentioned multiple loop transmission system, an OR circuit in which a plurality of inputs are individually connected to each reception side transmission line and one output is connected to the reception end of the communication device, and a A first switch that selects which of the transmitting side transmission lines to connect to, and a first switch that connects each receiving side transmission line to the corresponding transmitting side transmission line when in the receiving mode, and connecting each receiving side transmission line to the corresponding transmitting side transmission line when in the transmitting mode. and a second switch connected to the transmission end of the communication device via the first switch.

[Effect]

Therefore, the received data from each reception side transmission path is always given to the reception end of the communication device via the OR circuit, while in the reception mode, each reception side transmission path sends data to the corresponding transmission side transmission path. In contrast, in the transmission mode, each transmitting side transmission path is directly connected to the transmitting end of the communication device via the second and first switching devices. The first switching device can freely select which transmitting side transmission line to transmit data to.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

Figure 2 is a block diagram of the entire configuration, and shows the communication device (hereinafter referred to as
A switching device (hereinafter 5) is provided for each corresponding to CI) It to 1n.
WE)2. ~2n are provided, and between these, the first and second transmissions Wr A t ~ person n and B1 ~ Bn transmit data in a fixed direction, each indicated by an arrow, in the form of a loop. They are connected to form a double loop transmission system as a whole.

In this case, one of c11t to 1n has a transmission right called "f)-token", and transmits data using the transmission route person or B, and when another CE receives it, the same , the CE designated by the CG that has the transmission right sends a response, and when the communication between the CE that has the transmission right and the other party ends, the CE that has the transmission right sends a signal indicating that it will take over the transmission right. Accordingly, the other CG with higher priority obtains the transmission right, and each CG controls these operations.
EI□ to 1n are repeated.

Note that CEl 1 to 1n are SWF, 2° to 2n depending on the transmission mode for transmitting and the reception mode for only reception.
are individually controlled, and selection of transmission path A or B and switching of connection status are performed via this control.

FIG. 1 is a block diagram showing the details of CEl and SWg2. CEl is composed of a terminal equipment (hereinafter referred to as TE) 11 and a transmitting/receiving unit (hereinafter referred to as 5R) 12, and SR12 is composed of receiving end R and It has a transmitting end S, reads the received data from the receiving end R and gives it to the TE11, processes the data sent from the TE11 into a state suitable for transmission, and transmits it from the transmitting end S. ing.

On the other hand, 5WE2 accommodates the receiving side transmission paths Am, Bx and the sending side transmission paths Ag, Bs of each transmission path A, B, and the logic '! 0 circuit to each input of the OR gate 21, each receiving side transmission line human milk, B! are connected to each other, and the output of the OR gate 21 is connected to the receiving end R of 5R12.
connected to.

In addition, the first and second switching devices (hereinafter referred to as 5W) 22.2
3 is provided, and the main pole of 5W22 is the transmitting end S of 5R12.
(The child type of this is connected to each child type of 5W23 that contacts the main pole when 5W23 is in transmission mode T), and each main pole of 5W23 using two switches Transmission side transmission lines AI and B11 are connected to each other, and corresponding reception side transmission lines Am and Bg are respectively connected to each child type that comes in contact with these in reception mode P.

In addition, SW22.23 contains <5 based on the judgment of T111.
In response to the control signals A/B and P/T from R12, depending on the signals A/B, it is selected which of the transmission paths AX and B is to be used, and depending on the signals P/T, the reception mode or the transmission mode is selected. The mode is set.

Therefore, regardless of the mode, the received data from each receiving side transmission path Am, BR is given to the receiving end R of the SR12 via the OR gate 21, and reception is performed. , 5W23, each receiving side transmission path All, BR corresponds to the transmitting side transmission path Aa,
It is connected to Bs, and relaying is performed.

In addition, in transmission mode T, each transmission side transmission path A8, R3 is connected to S via 5W22 by the response of SW'23.
It is connected to R12aS, and depending on the control status of 5W22, it is possible to freely select whether to connect the transmitting end S to the transmitting side transmission line Aa or B@Noisere.

Therefore, without providing 5R12 for each transmission path and without intervening a switch or the like on the receiving end R side of the SR12, it is possible to perform relaying and to set the reception and transmission modes. In addition, the configuration of SWE2 is simple, and a multi-loop transmission system that is inexpensive and highly reliable is realized.

However, a mixed circuit, a hybrid transformer, etc. may be used in place of the OR gate 21 (various switches, selectors, multiplexers, etc. can be used as the ff22.23, and the 5W23 Divide by transmission path,
The same effect can be achieved even if the control is performed individually, and it is possible to install not only two transmission lines but also a larger number of transmission lines in parallel, and select the number of inputs of the OR circuit and the configuration of 3W22.23 accordingly. can be freely modified.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, a multi-loop transmission system can be constructed at low cost using a switching device with a simple configuration, so that remarkable effects can be obtained in various types of high-fidelity data transmission. .

[Brief explanation of drawings]

The figures show an embodiment of the present invention, with FIG. 1 being a configuration diagram showing details, and FIG. 2 being a block diagram showing the entire configuration. 1, j 1 ~ jne e * II CE (communication equipment), 2.2, ~'lna 11 m 1+ SWE
(switching device), 11 ---TE (terminal equipment), 1
2...SR (transmission/reception unit), 21...OR gate (logical sum circuit), 22.23SW (switcher), A4-A
n, Bl~Bn...transmission line, A3, R8...
Transmission side transmission line, Am BN...reception side transmission line.

Claims (1)

[Claims] In a multiple loop transmission system in which a plurality of communication devices are connected in a loop through a plurality of transmission paths, each of which transmits data in a fixed direction, a plurality of inputs are individually connected to each reception side transmission path, and an output is connected to the communication path. an OR circuit connected to the receiving end of the device; a first switch for selecting which of the respective transmitting side transmission paths the transmitting end of the communication device is connected to; and a second switch that connects each of the transmission lines to the corresponding transmission side transmission line, and connects each of the transmission side transmission lines to the transmission end of the communication device via the first switch when in the transmission mode. A switching device for a multiple loop transmission system characterized by: