JP2556140B2 - Multiple access switching system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multiple access switching system, and more particularly to a multiple access switching system for switching and connecting digital data of a network.

[Prior Art] In recent years, transmission lines have been digitized due to advances in digital technology. 64 kb / s is standard for such digital transmission lines. On the other hand, when performing data communication, the speed is often as low as 1200 b / s. Ie 6
Actually 120 while using a transmission line that can communicate up to 4 kb / s
This means that one channel of the transmission line is occupied at a low speed such as 0b / s.

[Problems to be solved by the invention]

As described above, in the conventional data communication, one low-speed data terminal occupies one channel of the transmission path. Therefore, when the number of data terminals increases, it is necessary as a whole compared to the actual data communication speed. There is a drawback that the capacity of the transmission line becomes large and the efficiency of the transmission line becomes very poor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multiple access switching system in which an output channel is divided into a plurality of auxiliary channels and used to improve the above-mentioned drawbacks.

[Means for solving problems]

The multiplex multiplex exchange connection method of the present invention comprises a digital line circuit connected to a data terminal through a line circuit and holding attribute information of the data terminal, and a plurality of input terminals and a plurality of auxiliary channels including a plurality of auxiliary channels. With an output terminal,
A multiplex multiplex trunk that secures a data communication path by determining the number of auxiliary channels and output terminals in young order according to the attribute information of the data terminal connected through the digital line circuit and the speech path switch, and the multiplex multiplex trunk , A digital interface trunk having a plurality of input terminals connected to the output terminals of the same through a speech path switch, and an output terminal connected to another station in the network, the digital line circuit, and the digital interface trunk. When a connection request is made from the data terminal to a data terminal existing in another station, the attribute information held by the digital line circuit is taken in and the multi-directional multiplexing is connected to the communication path switch for connecting between Notify the trunk that the multiplex trunk and the digital interface It is configured to include a processor for controlling the connection of said channel switch by information from Esutoranku.

〔Example〕

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

FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, the multiplex switching connection system is a multiplex multiplex trunk 1
The communication path switch 2, the digital interface trunk 3, the digital line circuit 4, and the processor 5 are included.

The multi-source multiplex trunk 1 has 20 terminals for input and 4 terminals for output. One terminal divides the output channel of 64 kb / s into 20 auxiliary channels, and it is necessary according to the data terminal attribute data of the data terminal connected to the input terminal. It has a function of calculating the number and arrangement of auxiliary channels. Further, the multiplex multiplex trunk 1 can use a plurality of output terminals, and in that case, the output terminals from the lowest output terminal must be used successively. Furthermore, all output terminals must be used by connecting to the same multi-way trunk of the same party.

The communication of the control information between the multiplex multiplex trunks is performed by the four auxiliary channels belonging to the lower output terminals. All the remaining auxiliary channels can be used for terminal data communication. Even when a plurality of output terminals are used, the control information is controlled by the control auxiliary channel belonging to the youngest output terminal. Therefore, if a plurality of output terminals are used, even the data of the communication speed which requires the use of all the auxiliary channels of one channel can be transmitted.

The digital line circuit 4 has a function of periodically reading the data terminal attribute information 7 from the interface device existing on the data terminal side, and can immediately provide the data terminal attribute information 7 in response to a request from the processor 5.

The digital interface trunk 3 has 30 terminals for input, and its output is connected to another station having the same equipment via a transmission device on the way. The digital interface trunk 3, the multiple multiplexing trunk 1, the digital line circuit 4 and the like and the processor 5 are connected by a bus 6 to transfer and control information. Although not shown in the figure, a terminal is connected to the processor 5, and some input terminals of the digital interface trunk 3 and some or all output terminals of the multiplex multiplex trunk 1 are fixedly connected by operation of the terminal. It Further, the processor 5 controls connection of the communication path switch based on information from the trunk and the line circuit.

The call request and the selection signal from the data terminal are notified from the digital line circuit 4 to the processor 5 through the bus 6. If the result of the analysis of the selection signal in the processor 5 is a connection request with a data terminal existing in another station in the network, the data terminal attribute 7 is taken out from the digital line circuit 4 that has made the call request, and the selection signal It is given to the multiple trunk 1 through the bus 6. The multiplex multiplex trunk 1 selects a data communication auxiliary channel or an auxiliary channel group according to the channel map of the auxiliary channel managed in the trunk and the data terminal attribute 7 of the calling terminal. In this way, when the data communication path is successfully secured, the calling data terminal attribute and the selection signal are sent to the opposite station. Then, the connection of the data communication path is completed by the incoming call response of the partner terminal, and the communication between the data terminals becomes possible.

〔The invention's effect〕

As described above, the present invention can reduce the line cost according to the amount of communication by performing the switching connection by the multiplex multiple trunk. Alternatively, it is possible to obtain more communication capacity than before with the same line cost.

Further, in the multiplex multiplexing of this method, it is not necessary to perform grouping according to the communication speed, and the handling is the same, and the usability is the same as the individual methods.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. 1 ... Multiple trunks, 2 ... Call path switch, 3 ...
... Digital interface trunk, 4 ... Digital line circuit, 5 ... Processor, 6 ... Bus, 7 ... Data terminal attribute.

Claims (1)

(57) [Claims] 1. A digital line circuit which is connected to a data terminal through a line circuit and holds attribute information of the data terminal, and a plurality of input terminals and a plurality of output terminals including a plurality of auxiliary channels. And a multiplex multiplex trunk that secures a data communication path by determining the number of the auxiliary channels and output terminals in the youngest order according to the attribute information of the data terminal connected through the digital line circuit and the communication path switch, and the multiplex A digital interface trunk having a plurality of input terminals connected to the output terminals of a multiple trunk via a speech path switch and an output terminal connected to another station in the network; the digital line circuit and the digital interface; A communication path switch for connecting to a trunk via the multiplex trunk, and the data terminal When a connection request is generated from the other terminal to a data terminal existing in another station, the attribute information held by the digital line circuit is fetched and notified to the multiplex trunk.
And a processor that controls connection of the communication path switch according to information from the multiplex multiplex trunk and the digital interface trunk.