JPS63187837A - Inter-network connection system - Google Patents

Abstract

PURPOSE:To realize a key number of an opposite terminal equipment within the format regulation of the standard reset packet by providing a table converting each connection request between a terminal equipment of a packet exchange network and a terminal equipment of other communication network into a call control signal for opposite network respectively to an inter-network connector. CONSTITUTION:In receiving a reset request packet from a terminal equipment of a packet exchange network 11, the inter-network connector 30 references a terminal equipment key number/subscriber number corresponding table 37 of a call control memory 36, converts the terminal key number in 1-byte representing the terminal equipment of other communication network 12 included in the packet into the call control signal used for the communication network 12 and sends the result to the communication network 12. Moreover, in receiving the call control signal from the terminal equipment of the communication network 12, the connector 30 converts it into a reset request packet for the exchange network 11. Thus, a terminal equipment subscribed by the PVC contract and the terminal equipment of the communication network 12 are subject to inter-network connection by the exchange network 11 via the connector 30.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to a packet switching network in which a communication partner subscribes to a fixed connection service (hereinafter referred to as PvC) contract fixed to a specific single or multiple terminals. The present invention relates to an inter-network connection system for interconnecting a terminal connected to a communication network and any terminal subscribed to another communication network.

[Conventional technology]

FIG. 4 is a block diagram showing a conventional inter-network connection system disclosed in, for example, Japanese Unexamined Patent Publication No. 58-215151. In the figure, 11 is a packet switching network, and 12 is another communication network such as a telephone network. , 21 is the packet switching network 11 under the pvc contract.
22 is a terminal that has joined another communication network 12 , 30 is a terminal that has joined the packet switching network 11 and another communication network 12
This is an inter-network connection device placed at the connection point with the network. Also, 31
is a signal conversion device 32 connected to the other communication network 12;
is a signal conversion control device connected to this signal conversion device 31, 33 is a protocol conversion processing section connected to this signal conversion control device 32, and 34 is this protocol conversion processing section 33.
A line control unit 35 is connected to the packet switching network 11, and a line control unit 35 is connected to the protocol conversion processing unit 3.
A memory 36 is connected to a memory 3, and a call control memory 36 is stored in the memory 35, and the inter-network control device 30 is composed of these devices.

Further, FIG. 5 is a connection sequence diagram showing a case where a terminal 21 under a PvC contract of the packet switching network 11 connects to an arbitrary terminal 22 of another communication network 12 between networks.

Next, the operation will be explained. Terminal 21 under PvC contract
is another communication network 12 that can be connected to the packet switching network 11.
When interconnecting with any terminal 22 of It can only send call management packets and data packets that can reach one of the other parties, and it does not have call control functions such as call setup and release. Therefore, in order to connect to the terminal 22, the desired method is to extend the reset request bucket (RQ) (packet requesting the start of communication) and add a new subscriber number DA indicating the terminal 22 of another communication network 12. It was connected to terminal 22. That is, the terminal 21 under the PVC contract expands the reset request packet, adds the other party's subscriber number DA, and generates an extended reset request packet).
When sent to the packet switching network 11 as RQ (DA),
The packet switching network 11 that received this extended reset request packet RI(DA) receives the extended reset request packet RI(
DA) to the network connection device 30. Inter-network connection device 3 that received this extended reset instruction packet RX (DA)
0 is an extended reset instruction packet) Converts the other party's subscriber number DA in the RI (DA) to the No. 1 format of the other communication network 12,
The subscriber number is transmitted to another communication network 12. The other communication network 12 that has received the subscriber number transmits a calling signal to the terminal 22 corresponding to the subscriber number. When the terminal 22 that has received this paging signal transmits a response signal, the network connection device 30 marks the logical channel number displayed in the extended reset instruction packet RI (DA) as being in use, and then performs packet exchange. Reset confirmation packet R to network 11
Send F.

The packet switching network 11 that received this reset confirmation packet RF transmits this reset confirmation packet RF and pv
C. The data is sent to the terminal 21 under the contract, and thereafter the data transfer state is entered.

[Problem that the invention seeks to solve]

Since the conventional inter-network connection system is configured as described above, the method of extending the reset request packet RQ and the reset instruction packet RI and adding the other party's subscriber number DA is based on the x@25 standard RQ/ There is no field to include this subscriber number DA in the format regulations of the RI packet, and since this subscriber number requires an area of several bytes, the packet switching network 11 and PVC
This resulted in the addition of provisions that lacked generality to the contracted packet terminal 21, leading to problems such as a lack of standardization regarding connectivity with other packet switching networks and reset packets.

This invention was made to solve the above-mentioned problems, and is an inter-network system that can realize information corresponding to the other party's subscriber number (key number indicating the other party's terminal) within the format regulations of the standard reset packet. The purpose is to obtain a connection method.

[Means for solving problems]

The inter-network connection system according to the present invention includes a 1-byte terminal key number indicating a desired terminal that has joined another communication network, which is included in a reset request packet sent from a terminal in a packet switching network. Joining the terminal of the other communication network in order to convert the call control signal sent from the terminal of the other communication network into a reset request packet for the packet switching network. The network connection device is provided with a terminal key number/subscriber number correspondence table showing the relationship between a subscriber number and a terminal key number consisting of one byte corresponding to this subscriber number.

[For production]

When the network connection device in this invention receives a reset request packet sent from a terminal of a packet switching network,
With reference to the above terminal key number/subscriber number correspondence table, the 1-byte terminal key number indicating a predetermined terminal accommodated in another communication network included in the reset request packet,
It converts it into a call control signal used in the other communication network and sends it to the other communication network, and when it receives the call control signal sent from the terminal of the other communication network, it converts it into a call control signal for use in the packet switching network. By converting it into a reset request packet, network connection between a terminal that has subscribed to the packet switching network under a PVC contract and a predetermined terminal that has subscribed to the other communication network via the inter-network connection device. I do.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 37 is a terminal key number/subscriber number correspondence table provided in the call control menu 36 stored in the memory 35, and the configuration of this memory 35 and the reset request bucket in the protocol conversion processing section 33. ) The method is the same as the conventional method shown in FIG. 4, except that the processing for RQ is different.

Next, the operation will be explained. A call management packet, ie, a reset packet, which can be sent from a terminal 21 that has joined the packet switching network 11 under a PvC contract, is sent to the inter-network connection device 30 connected to the packet switching network 11 as a destination code.
, and a partner terminal key number DAK for connecting the partner terminal 22 of another communication network 12 to this logical channel number.

The signal conversion device 31 of the inter-network connection device 30 connects to another communication network 12.
The level signal, pulse signal, and PB flaw signal used in the system are converted into character codes, and vice versa. Further, this signal conversion device 31 is connected to a terminal 22 that has joined another communication network 12.
It also sends and receives data between. Note that there is also a method in which a specific signal converter 31 is commonly used for call control signals, and another signal converter 31 is used for data transmission and reception. The signal conversion device control unit 32 instructs the signal conversion device 31 to transmit and receive call control signals using level signals and the like and to transmit and receive data. Moreover, this signal conversion control device 3
2 receives a signal from the signal converter 31 and a data transmission/reception request signal. The protocol conversion processing unit 33
According to the program and call control information stored in 5, P
The content of the reset packet used in vC is converted into a call control signal code, and the signal conversion device 31 converts this call control signal code into a call control signal for another communication network 12. Further, the inverse conversion is also performed in the same manner.

Further, the protocol conversion processing unit 33 packetizes data from the terminal 22 of the other communication network 12, and conversely decomposes the packet from the terminal 21 based on the PVC contract of the packet switching network 110 (hereinafter, this function is referred to as PAD). The line control unit 34 transmits and receives packets to and from the packet switching network 11.

Here, the configuration of the call control memory 36 stored in the memory 35 is shown in FIG. The sequence is shown in FIG. In the call control memory 36, the partner terminal key number DAK sent from the terminal 21 that joins the packet switching network under a PVC contract is stored.
a terminal key number/subscriber number correspondence table 37 for obtaining the subscriber number DA from the terminal; a logical channel management table provided corresponding to each of the terminals 21 to manage use/unuse of the logical channels of each terminal 21; 38. Search using the subscriber number sent from the terminal 22 of the other communication network 12,
A partner terminal 2 that joins the packet switching network 11 under a PVC contract
There are three tables: a subscriber number/logical channel management table address correspondence table 39 for which a logical channel management table 38 corresponding to number 1 is obtained.

In FIG. 1, a terminal 21 that joins the packet switching network 11 under a PVC contract always adds a diagnostic code, which is an option field of the reset request packet RQ, and 1 byte corresponding to the other party's subscriber number in the diagnostic code area. Reset request bucket with remote terminal key number DAK assigned)R
Send Q (DAK). This reset request packet R
When the packet switching network 11 receives Q(DAK), the packet switching network 11 sends a reset instruction bucket) RI(DAK)
is transmitted to the network connection device 30. The inter-network connection device 30 that received the packet uses the signal conversion device 31 to convert the other party's terminal key number DAK in the reset instruction packet RI (DAK).
From there, the terminal key number/subscriber number correspondence table 37 shown in FIG. 2 is searched to obtain the other party's subscriber number. This subscriber number is converted into the signal format of the other communication network 12, and the subscriber number is transmitted to the other communication network 12. The other communication network 12 that has received this subscriber number transmits a calling signal to the terminal 22 corresponding to the subscriber number. When the terminal 22 that received the paging signal transmits a response signal, the network connection device 30
This response signal is received by the signal conversion device 31, and the protocol conversion processing unit 33 writes a reset instruction packet (R) to the logical channel management table 38 of the call control memory in the memory 35.
I (DAK) is set to indicate that the logical channel number is in use, and the line control unit 33 controls the packet switching network 11.
(reset confirmation bucket) send RF.

Packet switching network 1 that received this reset confirmation packet
1 transmits a reset confirmation bucket (RF) to the terminal 11, and thereafter enters a data transfer state. The in-use indication of this logical channel number is returned to unused in the disconnection sequence at the end of communication.

On the other hand, from the terminal 22 of the other communication network 12 to the packet switching network 1
1 to the terminal 21, since the terminal 22 can send the subscriber number of the other party, the corresponding logical channel management table 38 is created in the subscriber number/logical channel management table address correspondence table 39 based on this subscriber number. By allocating appropriate unused channels in the logical channel management table 38, it is easy to connect to other communication networks 12.
call control information can be converted into information on the packet switching network 11.

〔Effect of the invention〕

As described above, according to the present invention, p
When connecting from a terminal subscribed to a VC contract to a terminal of another communication network, the specification of the other party's subscriber number is not directly included in the reset packet to extend the format regulations, but within the scope of the format regulations of the reset packet. In other words, the terminal key number corresponding to the other party's subscriber number is assigned to the option field area, and the actual other party's subscriber number is calculated from this terminal key number using the terminal key number/subscriber number correspondence table. This has the effect of maintaining the generality of the packet switching network and the terminals that subscribe to it through PVC contracts without sacrificing the standardity of the packet format.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an inter-network connection system according to an embodiment of the present invention, FIG. 2 is a configuration diagram showing a call control memory used in this, and FIG. 3 is a connection sequence of the embodiment shown in FIG. 1. 4 are block diagrams showing a conventional inter-network connection system, and FIG. 5 is a connection sequence diagram thereof. 11 is a packet switching network, 12 is another communication network, 21 is a terminal that has subscribed to the packet switching network under a PVC contract, 22 is a terminal that is subscribed to another communication network, 30 is an inter-network connection device, 3
6 is a call control memory; 37 is a terminal key number/subscriber number correspondence table; In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent Applicant: Mitsubishi Electric Company, Ltd. Figure 2 37: Keigosue A-Odo/Ga Uheli (No. Nayaretefu 1 and Figure 4)

Claims (1)

[Claims] An inter-network connection device is placed at the junction point between the packet switching network and other communication networks to connect terminals that subscribe to the packet switching network with a fixed connection service contract and terminals that subscribe to the other communication networks. In the network-to-network connection system that interconnects the subscriber numbers of the terminals of the other communication networks and
The network connection device has a terminal key number/subscriber number correspondence table showing the relationship with the terminal key number consisting of bytes, and the network connection device receives the reset request packet sent from the terminal of the packet switching network. When receiving the 1-byte terminal key number indicating the predetermined terminal subscribed to the other communication network included in the reset request packet, it refers to the terminal key number/subscriber number correspondence table. , converts it into a call control signal to be used in the other communication network and sends it to the other communication network, and upon receiving a call control signal sent from a terminal of the other communication network, converts it into a call control signal to be used in the packet switching network. An inter-network connection method characterized in that the reset request packet is converted into a reset request packet for use in the network and sent to the packet switching network.