JPS60140957A - Inter-network connecting system between line exchanges - Google Patents

Abstract

PURPOSE:To attain mutual communication between various terminal devices and other communication network terminal devices by adding a storage function of communication protocol information of a terminal device and the said information transmitting function to an interface circuit corresponding to the terminal device and providing a transmission/reception function of plural kinds of communication protocols to the inter-network connecting device. CONSTITUTION:A terminal 1F circuit 20 has an 1F function, a function storing terminal attribute information relating to a communication protocol of a terminal device 11, a function transmitting said information to an inter-network connecting device and a control function. Furthermore, a channel is set between the terminal device 11 and the device 13 ahead the communication between the terminal device 11 and the terminal device 16 of the other communication network 12, the 1F circuit 20 informs the information relating to the said communication protocol to the device 13, the device 13 selects the communication protocol to be transmitted and received with the terminal device 11 based on the said information and then the terminal devices 11 and 16 are communicated through the said channel.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for realizing an inter-network connection function in a line exchange.

(Prior art and its problems) When connecting a circuit switching system to another communication network, such as another circuit switching network, packet switching network, or local area network, the communication speed of each terminal accommodated in both networks Since the communication protocols such as , codes, error detection/retransmission methods, etc. are different, an inter-network connection device is installed between the two.
These are converted, matched and connected. In this way, when a line exchange and another communication network (other network) are interconnected, a terminal accommodated in the line exchange and a terminal accommodated in the other network may attempt to communicate.

(In the following explanation, since information processing devices such as converters appear to be equivalent to terminals when viewed from the switchboard, they will be collectively referred to as terminals.) For example, in FIG.
When the terminal 11 makes a call, the circuit exchange 10 receives the internal destination number from the terminal 11. When this destination number is the number of the inter-network connecting device 13 that performs interconnection with the partner network 12, the line exchange 10, under the control of the central control unit 14, connects the terminal 11 and the inter-network connecting device 13 to the call switch 15. Set up a call switch route to connect network connection device 1.
Notify 3 of the incoming call. Thereafter, the terminal 11 sends the network 12 number of the terminal 16 accommodated in the network 12 to the network connection device 131 through the call switch route. The network connection device 13 that has received this number prepares for communication with the terminal 16 according to the number, and then
3, while converting the terminal-to-terminal communication protocol,
Communication between terminal 11 and terminal 16 is performed.

In FIG. 1, reference numeral 17 denotes an interface circuit provided at an unsupported terminal for detecting call origination, recovery, destination number, etc. of a terminal, and notifying the central control unit.

According to this method, only when the communication protocol that the terminal 11 sends and receives matches the communication protocol that the network connection device 13 can send and receive, the terminal 11 and the network connection device 1
3 can communicate. However, in circuit switching equipment that accommodates different types of terminals, communication protocols such as transmission/reception speeds, codes, error detection/retransmission methods, etc. differ depending on the terminal type, and even if these terminals are connected to an inter-network connection device via a call switch, However, other terminals cannot communicate with the network connection device, except for terminals that use a communication protocol that the network connection device can send and receive. Therefore, these switch-accommodated terminals cannot communicate with terminals accommodated in other communication networks while exchanging communication protocols via inter-network connection devices.

On the other hand, there is a method in which an inter-network connecting device is installed for each terminal type, that is, corresponding to a communication protocol, and the central control unit selects and connects the inter-network connecting device depending on the type of terminal accommodated in the exchange. However, such a method requires the installation of multiple types of network connection equipment, which tends to be complicated and expensive due to the complicated geography such as conversion of communication speed, code, error detection/retransmission method, etc. It has the disadvantage that it must be

Furthermore, when multiple types of network connection devices are installed as described above, the central control unit manages the terminal type and selects the network connection device to be connected by referring to information representing the terminal type when connecting a terminal. Since selection control is required, the software of the central control unit becomes complicated, which has the disadvantage of increasing the load on the central control unit and reducing processing capacity. Furthermore, the increasing complexity of software makes development, maintenance, etc. difficult.

(Object of the Invention) The present invention overcomes such drawbacks in the prior art, and provides an interface circuit in a line exchange that does not support terminals, a function for retaining information related to the communication protocol used by the terminal, and a function for retaining information related to the communication protocol used by the terminal. By adding the transmission function and these control functions, and also providing the inter-network connection device with the function of transmitting and receiving multiple types of communication protocols to and from the exchange-accommodating terminal, it is possible to save money and reduce the processing time of the central control unit. It is an object of the present invention to provide an inter-network connection system that enables mutual communication between various switch-accommodating terminals and other communication network-accommodating terminals (5) without complication.

(Structure of the Invention) According to the present invention, different types of terminals (switch accommodation terminals) are mixedly accommodated via a terminal interface circuit, and terminals within a communication network are accommodated in another communication network via an inter-network connection device. An inter-network connection method for a line exchange used in a line exchange that connects with a terminal accommodating another communication network (a terminal accommodating another communication network), which connects a terminal accommodating an exchange to a terminal accommodating the other communication network prior to communication between the terminal accommodating the exchange causing the terminal interface circuit corresponding to the exchange-accommodating terminal to notify the inter-network connecting device of information regarding a communication protocol used by the terminal through a call switch path set between the inter-network connecting device; and based on the information dispute; The method is characterized in that the inter-network connecting device selects a communication protocol to be transmitted and received between the exchange-accommodating terminal and the exchange-accommodating terminal, and then causes the exchange-accommodating terminal and the other communication network-accommodating terminal to communicate through the call switch path. An inter-network connection system for line exchanges is obtained.

(-6,) (Example) Hereinafter, a detailed description will be given with reference to the drawings.

FIGS. 2(1) and 2(2) are explanatory diagrams showing an embodiment of the present invention. In FIG. 2, a terminal interface circuit 20 is installed to correspond to the terminal, and has a terminal interface function, a function to hold information related to the communication protocol ζ used by the terminal as terminal attribute information, and a function to transmit terminal attribute information to an inter-network connection device. It includes an interface circuit 21, a terminal attribute information holding circuit 22, a terminal attribute information transmitting circuit 23, and a control circuit U. It is assumed that the terminal attribute information holding circuit 22 holds information regarding the communication protocol used by the terminal 11 connected to the terminal interface circuit 2o by a method such as registering in advance. Further, the interface circuit 21 has substantially the same function as the interface circuit 17 in FIG. 1.

On the other hand, the inter-network connection device 13 has a function of transmitting and receiving a plurality of types of communication protocols to and from an exchange-accommodating terminal.

Now, in FIG. 2 (1), the line exchange 10 is the terminal 1
1 makes a call, it receives the destination number within the circuit exchange from the terminal 11 through the interface circuit 21. When this destination number is the number of the inter-network connection device 13 that interconnects to the partner network 12, the line exchange 10 connects the terminal 11 and the inter-network connection device to the call switch 15 under the control of the central control unit 14. 3, and notifies the inter-network connection device 13 of the incoming call. Then, after that, the terminal interface circuit uses this call switch path,
Under the control of the control circuit U, the terminal attribute information holding circuit 22
The terminal attribute information transmitting circuit 23 transmits the output to the inter-network connection device 13. The network connection device 13, which is capable of transmitting and receiving a plurality of communication protocols, selects a communication protocol to be transmitted and received based on this terminal attribute information.

Thereafter, the terminal interface circuit 20 connects the terminal 11 and the network connection device 13 through the call switch path,
The terminal 11 and the network connection device 13 are caused to communicate.

The network connection device 13 follows the selected communication protocol.
Communicate with the terminal 11, perform necessary protocol conversion processing, and enable mutual communication between the terminal 11 and the terminal 16 (
Figure 2 (2)).

In the above description, the control circuit U is provided for each terminal interface circuit, but if processing capacity is available, a configuration in which one control circuit is in charge of a plurality of terminal interface circuits is also possible.

Further, although only the case where a terminal accommodating an exchange makes a call and communicates with a terminal accommodating another communication network has been described, the present invention is similarly applicable to a case where a terminal accommodating another communication network makes a call and requests communication with a terminal accommodating an exchange. It is possible.

As can be seen from the above, according to the present invention, a terminal interface circuit provided for a terminal notifies an inter-network connection device of terminal attribute information in advance. Using this information, the network connection device can know what kind of communication protocol is used by the exchange-accommodating terminal, and can select the communication protocol to be transmitted and received. As a result, the network connection device can communicate with various terminals.

In addition, the terminal interface circuit and the network connection device automatically notify the terminal attribute information and select the communication protocol (9), so the terminal does not need to be aware of these operations at all.Furthermore, the central control unit It performs only the basic functions of a line exchange, such as origination processing, call switch route setting, and communication completion processing, and is not involved in processing related to communication protocols. Therefore, the processing at the time of connection control does not become complicated, and problems such as an increase in the load on the central control unit and a decrease in processing capacity do not occur. Moreover, the difficulties in developing and maintaining the central control unit software will not increase.

Furthermore, if the present invention is used, even in existing line exchanges, by adding to the interface circuit the function of holding information regarding the communication protocol used by the terminals, the function of transmitting this information, and the control functions thereof, central control of the line exchange can be performed. It is possible to easily realize the function of communicating between various terminals and network connection devices without making any changes to the hardware or software.

These results are obtained by clearly separating the basic functions of a line exchange, such as setting call switch routes, and functions related to communication protocols (10) into the central control section of the line exchange and the terminal interface circuit. By doing this, the entire system becomes more flexible.
(Effects of the Invention) As described above in detail, according to the present invention, in a line exchange, an interface circuit provided for a terminal can be used to In addition to adding an information retention function regarding communication protocols, a function for transmitting this information, and a control function for these, the inter-network connection device is also equipped with a function for transmitting and receiving multiple types of communication protocols to and from terminals accommodated in the exchange, and the terminal interface circuit By notifying the network connection device in advance of the communication protocol and having the network connection device select the communication protocol to be transmitted and received, it becomes possible to cause the network connection device to communicate with various terminals.

As a result, mutual communication between terminals accommodated by various exchanges and terminals accommodated by other communication networks is made possible via the inter-network connection device economically and without complicating the processing of the central control unit.
The effect is remarkable.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an inter-network connection system in a conventional line exchange, and FIG. 2 α) and (2) are diagrams showing an embodiment of the present invention. In the figure, 10 is a circuit exchange, 11.16 is a terminal, and 1
2 is a communication network, 13 is an inter-network connection device, 14 is a central control unit,
15 is a call switch, 20 is a terminal interface circuit,
21 is an interface circuit, 22 is a terminal attribute information holding circuit, % is a terminal attribute information transmitting circuit, and 24 is a control circuit.

Claims (1)

[Claims] A terminal within a communication network that accommodates a mixture of different types of terminals (terminals accommodating an exchange) via a terminal interface circuit, and is further accommodated in another communication network via an inter-network connection device (terminals accommodating other communication networks)
An inter-network connection method for a line exchange used in a line exchange that connects the exchange-accommodating terminal and the network connection prior to communication between the exchange-accommodating terminal and the other communication network-accommodating terminal. The terminal interface circuit corresponding to the exchange-accommodating terminal notifies the inter-network connection equipment of the communication protocol used by the terminal through the call switch route set between the device and A network for a line exchange, characterized in that a connecting device selects a communication protocol to be transmitted and received with a terminal accommodating an exchange, and then causes the terminal accommodating the exchange to communicate with a terminal accommodating another communication network through the call switch path. Interconnection method.