JPH03173264A - Order wire system - Google Patents

Abstract

PURPOSE:To prevent occurrence of howling while keeping redundancy being an advantage of ring structure in the order wire system in the system of ring structure by providing a redundancy changeover switch and a bridge to each station. CONSTITUTION:A transmission/reception redundancy channel tying optional two stations is formed by using channel overhead (bit group assigned for maintenance) among stations A, B, C, D interconnected by a ring transmission line L. A redundancy changeover switch SW and a bridge BRD are provided to each station and the SW is used to select each reception channel clockwise or counter clockwise and the BRD is used to send a voice data to each of clockwise counter clockwise transmission channels. Then a receiver side uses the SW to select one of the channels to fetch a voice data and does not send the data again. Moreover, the constitution of stations A-B, A-D, B-C, B-D, C-D is implemented similarly. Since the voice data is sent by using a different channel among the stations, production of howling is prevented while keeping the redundancy at ring system constitution.

Description

[Detailed Description of the Invention] [Summary of the Invention] Regarding an order wire system for a transmission line having a ring configuration, in the order wire system for a ring configuration system,
The purpose of this method is to prevent the occurrence of howling while maintaining the redundancy that is a feature of a ring configuration. A redundant transmitting/receiving channel consisting of a channel overhead is provided, and each station is equipped with a redundant switch for selecting a counterclockwise/clockwise receiving channel, and a redundant switch for selecting a counterclockwise/clockwise receiving channel, and a redundant switch for selecting a counterclockwise or clockwise receiving channel, and a redundant switch for selecting a counterclockwise/clockwise receiving channel, and a switch for transmitting audio to each counterclockwise or clockwise transmitting channel. A bridge circuit is provided to carry data,
Audio data is placed on the channel overhead and sent to each of the left and right transmission channels, and the receiving side selects one of them using a redundancy selector switch and captures the audio data, but does not retransmit the audio data. Configure it like this.

[Industrial Field of Application] The present invention relates to an order wire system for a transmission line having a ring configuration.

In a communication system, when maintaining equipment, operators at each station may communicate by sending/receiving calls over a single communication path, and this communication path is called an order wire.

[Prior Art] FIG. 3 shows a conventional order wire system. Stations A to E each have telephone equipment, and terminal stations A and D.

At E, the telephone is connected directly to the line, but at intermediate stations B and C.
Then, it is connected via bridge BRD and synthesizer ①. This makes it possible to talk to five stations simultaneously in this example. In other words, when you send a call at station A, it is received at station B-B, and when you send a call at station B, A,
The call is received at the C-B station, and so on. At intermediate stations B and C, the voice signal sent from other stations through the line is distributed to the telephone equipment and synthesizer ■ by bridge B.
A voice signal emitted from the handset of the telephone and manually input from the transmitter of the telephone is combined with the voice signal from the bridge by the synthesizer and sent to another station.

This allows multiple people to talk at the same time.

[Problem to be Solved by the Invention] In a connection system where the devices (stations) do not form a ring as shown in Figure 3, the order wire system uses a bridge circuit and a combiner at the intermediate station to transfer and insert data. can be formed,
There is no particular problem with this.

However, when applied to a system with a RING configuration as shown in FIG. 4, problems such as howling occur. For example, audio data sent from station A passes through stations B, C, and D.
It is combined with the audio data sent by the station and returned. At the A station, this is also combined with the audio data sent from the own station and sent to the B station. This is repeated thereafter, resulting in howling.

An object of the present invention is to prevent howling from occurring while maintaining redundancy, which is a feature of the ring configuration, in an order wire system in a ring configuration system.

[Means to solve the problem]

As shown in Fig. 1, in the present invention, channel overhead (a group of bits allocated for maintenance) is used to arbitrarily connect stations A, B, etc. connected by a ring transmission path. A redundant transmitting/receiving channel is configured to connect the two stations. Each station is provided with a redundant changeover switch SW and a bridge BRD, and the switch SW selects the counterclockwise and clockwise receiving channels, and the bridge BRD sends the audio data to the counterclockwise and clockwise transmitting channels. . On the receiving side, switch SW
Select one of these and import the audio data, and the audio data will not be retransmitted without being imported.

Note that SD in FIG. 1 is a transmitted signal of a channel containing audio data, and RD is a received signal thereof. Also, in Figure 1, A-
C shows the inter-station configuration, A-B, AD, B-C, B-D,
The same applies to the configuration between CD and D stations.

(Operation) In this method, audio data is transmitted using channel overhead, and the receiver selects and extracts this data using a switch SW.The extracted audio data is never sent back and is discarded by the receiver. The reverse is also done in the same way.The problem of howling can therefore be solved.

In addition, redundancy can be satisfied because the signals of the same channel are branched and sent to the left and right transmission channels, and the receiving side selects the faulty one using the switch SW.

Furthermore, since the audio data is placed on the channel overhead, the switching depends on the channel switching, and there is no need for special switching in the order wire.

〔Example〕

FIG. 2 shows an embodiment of the present invention. (a) is A-C.

4 with the communication path between A-B and B-0 and voice synthesis at A and B.
The order wire configuration that enables simultaneous calls between stations is not shown. (
b) shows the configuration between A and C, and although not shown, A
-B and B-D have the same configuration. A because it is a redundant configuration
-C communication path consists of clockwise A-B-C and counterclockwise A-D-C, and similarly, the A-B communication path consists of A-B, A-D-C-B, , B
-D is composed of B-C- and B-A-D.

For example, to transmit voice data from station A to station 0, the voice data is placed on a certain channel of station A (communication path between A and C) and transmitted to station 0. At this time, in stations B and D, channels carrying audio data are passed through. At station 0, the switch SW selects either the channel via station 8 or the channel via station 0, and audio data is extracted. When transmitting from station 0 to station A, the flow is reversed, and at station A, the switch SW selects either the channel via station B or 0.

Voice data is transmitted using different channels between B and D and between A and B, and voice synthesis is performed at stations A and B, so it is possible to talk between any two to four stations at the same time. For example, the data transmitted by station A is directly transmitted to C and B, and then relayed (voice synthesis) by station B to reach station D, where it is received. Further, the data transmitted by the 8th station is directly sent to A and D, and then relayed by the A station to reach the 0th station, where it is received. The same applies to the data transmitted by stations C and D, and thus stations A, B, C, and D can communicate simultaneously. The voice data is transmitted to each station through a different communication path, and the voice data is discarded at the terminal stations C and D in this example, so there is no loop circulation and howling.

(Effects of the Invention) As explained above, in the present invention, audio data is transmitted using different channels between each station, so it is easily possible to realize an order wire with redundancy when configuring a ring. This greatly contributes to improving the performance of the device.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the principle of the present invention, FIG. 2 is an explanatory diagram showing an embodiment of the present invention, and FIGS. 3 and 4 are explanatory diagrams of conventional examples 1 and 2. In FIG. 1, L is a ring-configured transmission line, A-D is a station, SW is a redundancy changeover switch, and BRD is a bridge. D SD D SD Figure 1: Principle of the present invention Figure 2: Explanation showing the implementation of the present invention

Claims (1)

[Claims] 1. Each station (A, B,...) connected by a ring-configured transmission path
In the order wire system formed between the two stations, a redundant transmitting/receiving communication path consisting of channel overhead is provided to connect any two of the stations, and each station is provided with a selection of a counterclockwise/clockwise receiving communication path. A redundancy switch and a bridge circuit for transmitting voice data to the left-handed and right-handed transmitting channels are installed, and the voice data is placed on the channel overhead and sent to the left-handed and right-handed transmitting channels for reception. An order wire system characterized in that either one of them is selected by a redundancy changeover switch and audio data is captured at the side, and the audio data is not retransmitted.