JPH05130120A - Digital exchange system - Google Patents

Abstract

PURPOSE:To improve the efficiency of an entire communication and to increase profitability by quickly transfer data. CONSTITUTION:Terminal equipments 141-144 are connected to a digital exchange 11 having a star wiring form. The digital exchange informs each terminal equipment of loop connection mode. A digital switch 12 in the digital exchange in response to the loop connection mode notice implements switching to connect the transmission channel of each terminal equipment sequentially to the reception channel of a succeeding terminal equipment. Moreover, the loop mode is set in response to the loop connection mode notice to each terminal equipment and its own data are added newly to received data and the result is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital exchange system in which a plurality of terminals are connected to a star type wiring type digital exchange.

[0002]

2. Description of the Related Art Conventionally, as this type of digital exchange system, one shown in FIG. 9 is known. This is provided with a digital switch 2 and a plurality of interfaces 31, 32, 33, 34, 35, ... In the digital exchange 1 and, for example, the terminals 31 to 34 respectively have terminals A41, respectively.
The terminal B42, the terminal C43, and the terminal D44 are connected, and the interface 35 is connected to the outside line. The output TX from each interface 31 to 35 is set to highway H /
The output from the digital switch 2 is supplied to the digital switch 2 via W1 and the input RX of each of the interfaces 31 to 35 via the highway H / W2. Further, the highways H / W3 and H / W4 for packet data are connected to the digital switch 2, and the highways H / W3 and H / W4 are connected to the packet processing units P1, P2,
P3 is connected.

As for communication between terminals in the conventional apparatus having such a configuration, a one-to-one circuit switching mode or packet switching mode is known. In the circuit switching mode, data input / output between terminals is directly connected by the digital switch 2 when communication is required. In the packet exchange mode, each terminal and the digital exchange 1 are always connected, and when communication is required, each terminal sends data to the digital exchange 1 with the number of the other party, and the digital exchange 1 sends the data to the packet. It was supposed to be temporarily stored in the memory of the processing unit and sent to the other party.

Further, as disclosed in Japanese Patent Laid-Open No. 1-132243, two B channels are used in ISDN (Integrated Services Digital Network), the first B channel is connected to a front terminal, and the second B channel is connected. It is known that a channel forms a loop by connecting to the next terminal.

[0005]

However, in the conventional apparatus, when the communication is performed in the circuit switching mode, it is necessary to connect the line and disconnect the communication each time data is transmitted / received, and it takes time to transmit / receive the data. was there. In addition, when communication is performed in the packet switching mode, it takes no time until the data is transmitted and received because the line is still connected, but since the data is temporarily stored in the memory in the digital exchange 1 and then sent to the other party, the entire communication is possible. There is a problem that the communication efficiency is lowered and a memory is required to store data.

Further, the one disclosed in the publication uses two B channels, so that a terminal needs a circuit for controlling the two B channels, resulting in high cost and operation of other terminals connected to the same line. There was a problem that I could not do it.

Therefore, the present invention is intended to provide a digital exchange system capable of transmitting and receiving data immediately, improving the communication efficiency as a whole, and improving the economical efficiency.

[0008]

According to the present invention, in a digital exchange system in which a plurality of terminals are connected to a star-type digital exchange, the digital exchange notifies each connected terminal of a loop connection mode. And a digital switch for switching the transmission channel of each terminal sequentially to the reception channel of the next terminal in response to the loop connection mode notification, and each terminal responds to the loop connection mode notification from the digital exchange. Then, the loop mode is set, and the received data is added with its own data and output.

[0009]

In the present invention having such a configuration, when the digital exchange notifies each terminal of the loop connection mode, each terminal sets the loop mode. Further, in the digital exchange, the digital switch is operated to perform switching so that the transmission channel of each terminal is sequentially connected to the reception channel of the next terminal. As a result, each terminal newly adds its own data to the received data and outputs it.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a digital switch 12 and a plurality of interfaces 1 are provided in a digital exchange 11.
311, 132, 133, 134, 135 ... Are provided, and the terminals A1 are connected to the interfaces 131-134, respectively.
41, the terminal B142, the terminal C143, and the terminal D144 are connected to each other, and the external line is connected to the interface 135.
The output TX from each of the interfaces 131 to 135 is supplied to the digital switch 12 via a highway H / W1 and the digital switch 12 is supplied.
The output from the above is supplied to the input RX of each of the interfaces 131 to 135 via the highway H / W2.
That is, the digital exchange 11 has a star type wiring configuration, the terminals 141 to 144 and the outside line perform call setup and disconnection processing via the interfaces 131 to 135 respectively, and the data is decomposed into transmission data and reception data. The highways H / W1 and H / W2 are time-division multiplexed.

As shown in FIG. 2, the positions of the actual festivals corresponding to the terminals 141 to 144 and the outside lines on the highways H / W1 and H / W2 are as shown in FIG.
RX, terminal BRX, terminal CRX, terminal DRX, outside line R
X, and for highway H / W1, terminal ATX, terminal BT
X, terminal CTX, terminal DTX, and outside line TX.

The digital exchange 11 has the terminals 1
The loop connection mode is notified to 41 to 144, and the digital switch 12 is switched, for example, as shown in FIG. That is, terminal ARX, terminal BRX, terminal CRX, terminal DRX in highway H / W2
Position of terminal BTX, terminal CTX, terminal DTX, terminal A
Switch to TX, terminal D144 → terminal C143 → terminal B1
42 → The loop of the terminal A 141 is formed.

At this time, each of the terminals 141 to 144 determines the loop connection mode and sets the internal mode to the loop mode. In this mode, new data is added to the received data and output.

In an embodiment having such a configuration, the terminal D
144 is each terminal C143, terminal B142, terminal A141
When it is desired to take in data from, the digital exchange 11 sets the loop connection mode. Then, as shown in FIG. 4, the terminal D144 is connected to each terminal C143, terminal B142,
The data fetching message D4 is sent to the terminal A141.

As a result, the terminal C143 first recognizes the message D4 and takes in the message D4.
It is sent with its own data D3 added to. Next, the terminal B142 recognizes the message D4 and recognizes the message D4.
4 and the data D3 are taken in, and the own data D2 is added to these D4 and D3 and sent. Next, the terminal A 141 recognizes the message D4 and recognizes the message D4 and the data D4.
3 and D2 are taken in, and their own data D1 is added to these D4, D3 and D2 and transmitted. And finally, terminal D14
4 recognizes the message D4, judges that the added data is the data of the terminals A, B and C, and the data D3,
Take in D2 and D1.

By performing data communication in the loop connection mode in this manner, the time required from the transmission of the message D4 by the terminal D144 to the acquisition of the data D3, D2, D1 becomes T1. On the other hand, the conventional device shown in FIG. 9 is as follows.

First, in the circuit switching mode, the communication form is as shown in FIG. That is, the terminal D44 and the terminal A41, the terminal B42, and the terminal C43 perform communication three times. Specifically, as shown in FIG. 7, the terminal D44 sets up a call with respect to the terminal C43. As a result, the digital switch 2 connects the terminal D44 and the terminal C43 as shown by the solid arrow in FIG. Then, the terminal D44 sends a message D4 after the call setup is completed. As a result, the terminal C43 recognizes the message D4 and sends its own data D3 to the terminal D4.
Send to 4. Then, the terminal D44 recognizes the data D3, and then performs disconnection processing to end the communication with the terminal C43.

The above processing is similarly performed for the terminals B42 and A41 to end all communication. And terminal D4
4 sends message D4 and then data D3, D2,
The time required to take in D1 is T2.

Thus, for example, the message D4 and the data D
Assuming that the transfer times of 3 to D1 are all TL, the time required for the terminal D to fetch all the data D3 to D1 in this embodiment is 10 TL as is apparent from FIG.
On the other hand, in the conventional circuit switching mode, assuming that the call setup processing time is TC and the disconnection processing time is TD, it becomes 3 (TC + TD) + 6TL as is apparent from FIG. Therefore 4
When TL <3 (TC + TD), the communication time of this embodiment becomes short. And call setup processing time TC and disconnection processing time TD
Is generally longer than the transfer time of the message D4 and the data D3 to D1, so that the communication time can be shortened as compared with the conventional case. That is, the communication efficiency can be improved. Further, in the conventional packet switching mode, the communication form is as shown in FIG.
That is, the call setup process and the disconnection process are not required as in the present embodiment.

Specifically, as shown in FIG. 8, the terminal D44
Sends messages D4-3, D4-2 and D4-1 to terminals C43, B42 and A41, respectively. As a result, the digital switch 2 sets the highway H /
The packet is transferred to the packet processing units P1, P2, P3 via W4. The packet processing units P1, P2 and P3 temporarily store the messages D4-3, D4-2 and D4-1 in the memory and output them to the highway H / W3. At this time, it takes TP time to temporarily store the data in the memory and output it.

Then, each message D4-3, D4-2, D4-
1 is output from the highway H / W3 to the highway H / W2 via the digital switch 2, and each terminal C, terminal B,
It is supplied to the terminal A. As a result, each terminal C, terminal B, and terminal A receives messages D4-3, D4-2, D4-1 from terminal D.
And outputs its own data D3, D2, D1 to the highway H / W1. Then, the digital switch 2 transfers the data D3, D2, D1 to the packet processing units P1, P2, P3 via the highway H / W4. The packet processing units P1, P2 and P3 temporarily store the respective data D3, D2 and D1 in the memory and output them to the highway H / W3. The data D3, D2 and D1 are output from the highway H / W3 to the highway H / W2 via the digital switch 2 and supplied to the terminal D. As a result, terminal D receives data D
Recognize 3, D2, D1.

Therefore, in this packet switching mode, the processing time is 6TL + 2TP. That is, when 4TL <2TP, the communication time of this embodiment is shortened and the communication efficiency can be improved. Moreover, the packet switching requires a memory for accumulating data according to the number of packet channels, but the loop connection mode communication of the present embodiment does not need this at all, so that the economical efficiency can be improved.

Further, since processing can be performed by one communication channel, communication can be performed only by one ISDN B channel,
Therefore, only one circuit for controlling the channel is required, which improves the economical efficiency and allows the other terminal to operate with the remaining one B channel.

[0025]

As described in detail above, according to the present invention, it is possible to provide a digital exchange system capable of immediately transmitting / receiving data, improving the communication efficiency as a whole, and improving the economical efficiency.

[Brief description of drawings]

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

FIG. 2 is a diagram showing data positions corresponding to respective terminals in H / W1 and H / W2 in the same embodiment.

FIG. 3 is a diagram for explaining the operation of the digital switch in the embodiment.

FIG. 4 is a diagram showing a data transfer time in the embodiment.

FIG. 5 is a diagram for explaining the operation of a conventional digital switch in a circuit switching mode.

FIG. 6 is a diagram for explaining the operation of the digital switch in the conventional packet switching mode.

FIG. 7 is a diagram showing a data transfer time in a conventional circuit switching mode.

FIG. 8 is a diagram showing a data transfer time in a conventional packet switching mode.

FIG. 9 is a block diagram showing a conventional example.

[Explanation of symbols]

11 ... Digital switch, 12 ... Digital switch, 14
1-144 ... Terminal.

Claims (1)

[Claims] 1. A digital exchange system comprising a star type digital exchange and a plurality of terminals connected to the digital exchange, wherein the digital exchange notifies the connected terminals of a loop connection mode, and the loop connection. In response to the mode notification, a digital switch for switching the transmission channel of each terminal to the reception channel of the next terminal is sequentially provided, and each terminal switches the loop mode in response to the loop connection mode notification from the digital exchange. A digital exchange system, which sets and adds new data to received data and outputs the data.