JPS6012829B2 - Highly reliable exchange network - Google Patents

Description

[Detailed description of the invention] The present invention relates to an economical reliable switching network.

In recent years, the role of communication networks in society has become increasingly important, and even a short interruption in communication can cause major social chaos, so there is a strong desire for communication networks, especially switching networks, to be highly reliable. There is. In order to improve the reliability of the subscriber exchange machine, which occupies an important position in the exchange network, it is conceivable to have a dual configuration for active use and backup. In such a case, if the concept of the conventional duplex configuration were to be followed as is, a subscriber line switching device would be required for each subscriber, and subscriber control would also need to be duplicated. Furthermore, due to the floor space limitations of the existing exchanges, it is difficult to install a backup exchange machine within the same station, and the station for the backup exchange machine must be installed at a location quite far away from the existing exchange station. Sometimes.

In this case, if we extend the concept of the conventional duplex configuration, it will be necessary to install the subscriber lines in duplicate, and this type of duplex configuration ends up being extremely expensive. There is. The present invention has been made in view of the above-mentioned problems associated with the duplex configuration of subscriber exchanges, and its purpose is to provide an economical and highly reliable exchange network.

The present invention provides a line concentration function on the subscriber terminal side, and distributes and accommodates the line concentration lines of the subscriber terminals equipped with the line concentration function in a plurality of subscriber exchanges, and connects these subscriber exchanges with each other by communication paths and signal paths. By connecting subscriber terminals to multiple subscriber exchanges, an economical and highly reliable switching network is provided. The details of the present invention will be explained below with reference to Examples. FIG. 1 is a functional block diagram of an embodiment of the present invention, in which 10 to 14 are subscriber terminals, 20, 21, 2
2 is a subscriber exchange machine, 23 and 24 are concentrating lines, 25 is a signal path, 26 is a speech path, 27 and 28 are duplex subscriber data files, 30 is a trunk exchange, and 31 and 32 are trunk lines.

The subscriber terminals 10 to 13 have a line concentration function that allows connection to any line in the line concentration circuits 23 and 24.

This kind of line concentration function is used in car telephone terminals and marine telephone terminals, but to explain this using marine telephone terminals as an example, [E] If the subscriber terminal is "empty", any line that has an idle line signal is connected to an empty line. 'o}
The subscriber exchange sends the incoming telephone number to all vacant lines,
Each subscriber terminal checks its own terminal number, and if they match, it sends a response signal back to the subscriber exchange via the currently connected line.

1. The local exchange connects to the caller using the currently connected line.

〇 Other subscriber terminals connected to the above line search for another free line and are connected to it.

When one of the subscriber terminals sends a calling signal (tone signal in the case of a marine telephone) to the subscriber terminal via the currently connected line, the terminal connected to the above line Other subscriber terminals search for and connect to another free line. Further details of such a line concentration function can be found, for example, in Telecommunications Research Practical Application Report 2nd Year Cover (King 1973) No. 3, 5
Page 13 “Call Processing in Ship Telephone Switching System” Volume 26 (19
(1977) No. 7, page 183, "Automobile Radio Telephone System" etc.

When receiving a call from the subscriber terminal 14 for 10 minutes, the subscriber terminal 14 dials the "area code" and "subscriber number" of the subscriber terminal 10.

Local exchanges 20 and 21 have the same area code. The transit exchange 30 translates the above-mentioned area code, and if both the subscriber exchanges 20 and 21 are normal, it randomly selects one of them. It is assumed that the subscriber exchange machine 20 is selected in this way. Subscriber exchange 20
Because it is unclear which of the concentrator circuits 23 and 24 the subscriber terminal 10 to be connected is connected to, it controls the incoming call connection to the concentrator circuit 23 under its control, and at the same time connects the signal path 25. The subscriber exchange 21 is called via the subscriber exchange 21. Called communication ≠ Okukatsu 21 is the concentrator line 24 under its own control
Performs incoming connection control for. Subscriber terminal 10 on the called side
is connected to the concentrator line 24, the subscriber terminal 10
sends a response signal back to the subscriber exchange key machine 21 from the connected concentrator line 24.

The subscriber switch 21 that has received the response signal transfers the response signal to the subscriber exchange 21 via the signal path 25. Upon receiving this, the subscriber exchange 20.21 cancels the incoming call connection control to the concentrator line 23, and makes a call using the route ≠ back unit 21 - concentrator line 24 - subscriber terminal 10. Set the route. If the subscriber terminal 10 is connected to the concentrator line 23 when the subscriber exchange 20 is selected, a response signal is sent from the subscriber terminal 10 to the subscriber exchange 201 via the concentrator line 23.

Upon receiving this response signal, the subscriber exchange 20 sends a signal to the subscriber exchange 21 via the signal path 25 to the effect that the incoming call connection control should be canceled, and sends a signal to the subscriber exchange 21 via the signal path 25, and routes the exchange 20-concentration line 23-subscriber terminal 10. Set up the call route. Subscriber terminal 10
If the subscriber terminal 10 is connected to the concentrator line 23, the connection route when the call is received from the subscriber exchange 2 to the subscriber exchange 14 is
0 through the trunk line 31, and if the subscriber terminal 10 is connected to the concentrator line 24, it is set through the subscriber exchange 21 and the trunk line 32. When the system of the subscriber exchange 20 goes down, this fact is reported to the relay exchange 30' by telephone or other means, and the relay exchange 3 that receives this report
Kawama relay line 31 is blocked.

At the same time, the subscriber alternator 20 stops sending the idle line signal to the concentrator line 23. Subscriber data files 27, 28
is the outgoing translated word, incoming translated word, which is essential when making a call or receiving a call.
Subscriber information such as money meter, speed dial IJ strike, etc. is stored, but since this is duplicated, even if the subscriber exchange 20 goes down, the exchange function can be maintained using the subscriber data file 28. be done. In the above embodiments, the case where the subscriber exchanges are duplicated has been described, but in general, multiplexing of two or more subscriber exchanges is possible. As explained above, according to the present invention, the concentrating lines of subscriber terminals having a concentrating function are distributed and accommodated in a plurality of subscriber exchanges, and subscriber exchanges are mutually connected with signal paths and speech paths, By assigning subscriber terminals to multiple subscriber exchanges, an economical and highly reliable switching network can be achieved.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of an embodiment of the present invention. lo~14...Subscriber terminal, 20, 21, 22...
...Subscriber exchange, 23, 24... Concentration line, 25... Signal path, 26... Call path, 27, 28... Duplex Subscriber data file, 30... Trunk exchange, 31, 32...
・Relay line. Figure 1

Claims (1)

[Claims] 1. The line concentrator circuits of subscriber terminals with a line concentrator function are distributed and housed in multiple subscriber exchanges, and the subscriber exchanges are interconnected by signal paths and communication paths, and the subscriber terminals are connected to the subscriber exchanges. A highly reliable exchange network characterized by multiple attribution.