JPH06120981A - Packet exchange network system - Google Patents

Abstract

PURPOSE:To remarkably reduce the cost and time required for the exchange of procedures by interchangeably using the procedure at a host side and the procedure at a terminal side without changing the terminal side. CONSTITUTION:A host 1 supports the protocol of an HDLC procedure. When a terminal 4 supports the asynchronous basic procedure, a protocol converter 3 which is inserted between the terminal 4 and a packet exchange network 2 exchanges the procedure of the host 1 and the procedure of the terminal 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packet switching network system which enables compatibility between an HDLC procedure and an asynchronous basic procedure.

[0002]

2. Description of the Related Art When a host side and a terminal side are connected using a packet switching network, the host side supports an HDLC procedure protocol, while the terminal side supports an asynchronous basic procedure (for example, level 2 procedure). ) Is supported, communication is performed by replacing one of the procedures with the other procedure, for example, replacing the terminal with the HDLC procedure.

[0003]

However, in such a conventional procedure adjusting method, the host side uses HDL.
When the terminal side supports the asynchronous basic procedure while the protocol of the C procedure is supported, one of the procedures, for example, the terminal H
Since it has to be replaced by the DLC procedure, there is a problem that enormous cost is required to change the terminal.

In the present invention, in view of the above circumstances, the host side is
Even if the protocol of the DLC procedure is supported and the terminal side supports the asynchronous basic procedure, the procedure on the host side and the procedure on the terminal side can be compatible with each other without changing the terminal side, thereby making the procedure compatible. It is an object of the present invention to provide a packet-switched network system that can significantly reduce the cost and time required for.

[0005]

In order to achieve the above object, the present invention provides a packet switching network system that supports communication between a host side and a terminal side via a packet switching network, wherein the host side performs an HDLC procedure. When the protocol is supported and the terminal side supports the asynchronous basic procedure, the protocol conversion is inserted between the terminal and the packet switching network and compatible with the procedure on the host side and the procedure on the terminal side. It is characterized by having a device.

[0006]

In the above configuration, when the host side supports the protocol of the HDLC procedure and the terminal side supports the asynchronous basic procedure, the host is supported by the protocol conversion device interposed between the terminal and the packet switching network. Side procedures and the terminal side procedures are compatible.

[0007]

1 is a block diagram showing an embodiment of a packet switching network system according to the present invention.

The packet switching network system shown in this figure comprises a host 1, a packet switching network 2, a protocol converter 3 and a terminal 4, and the terminal 4 and the host 1 are connected via the packet switching network 2. When performing communication between the terminals, the protocol conversion device 3 converts the protocol on the host 1 side and the protocol on the terminal 4 side to support communication.

The host 1 has a host body 5 for performing various processes, and CCITT recommended X. The interface unit 6 is provided for communicating with the packet switching network 2 using the 25-procedure HDLC procedure. When communicating with the terminal 4 side, the host unit 5 sends and receives data to and from the interface unit 6, and this interface It communicates with the other terminal 4 by communicating with the unit 6 and the packet switching network 2.

The packet switching network 2 is based on CCITT recommended X.
In 25 steps, packets are exchanged between the host 1 side and the protocol conversion device 3 to support communication between them.

The protocol converter 3 converts the HDLC procedure of the packet switching network 2 into the asynchronous basic procedure of the terminal 4 (for example, level 2 procedure), or the terminal 4
The asynchronous basic procedure of the HD of the packet switching network 2
It is configured to convert to an LC procedure, generates a transmission code or text data based on a packet from the packet switching network 2 and supplies it to the terminal 4, or a transmission from the terminal 4. A packet is generated based on a code or text data and is supplied to the packet switching network 2.

The terminal 4 uses an asynchronous basic procedure (eg
The protocol conversion device 3 is configured to communicate with the protocol conversion device 3 in the level 2 procedure).
It transmits and receives a transmission code and text data to and communicates with the host 1.

Next, the communication operation of this embodiment will be described with reference to the sequence diagrams shown in FIGS.

<< Connection Phase >> First, when the host 1 side communicates with the terminal 4 side, the host body 5 issues a command LAP-B requesting the setting of the data link, and the interface unit 6 correspondingly. Is the command SA
BM. If P is issued, the packet switching network 2 takes in this and supplies it to the protocol conversion device 3.

Then, the protocol conversion device 3 sends a response UA. When F is generated and sent out to the packet switching network 2, the interface unit 6 of the host 1 takes in it via the packet switching network 2 and establishes a data link.

Thereafter, when the host main unit 5 issues a business activation command and the interface unit 6 responds to this by issuing a call request packet CR, the packet switching network 2 receives the call incoming packet C.
N is generated and supplied to the protocol conversion device 3.

Then, if the protocol conversion device 3 confirms the incoming call, generates the incoming call acceptance packet CA and outputs it to the packet switching network 2, and the packet switching network 2 generates the connection completion packet CC, the interface The unit 6 takes in this, generates a signal indicating that the call setup is completed, and supplies this to the host main body 5.

After that, if the host main body 5 outputs the data Bind required for communication in the asynchronous basic procedure of the terminal 4, and the interface unit 6 outputs the data packet DT (Bind), the packet switching network 2 Takes in this and supplies it to the protocol converter 3.

If the protocol converter 3 generates a confirmation packet DT (+ RSP) indicating that the data packet DT (Bind) has been received and outputs this to the packet switching network 2, the interface section 6 The confirmation data RS included in this packet DT (+ RSP) is received through the packet switching network 2.
P is generated and supplied to the host body 5.

After this, if the host main body 5 outputs the data SDT required for communication in the asynchronous basic procedure of the terminal 4, and the interface unit 6 outputs the data packet DT (SDT) in response to this, , The packet switching network 2 captures this and supplies it to the protocol converter 3.

Then, the protocol converter 3 issues a polling request transmission code POL and supplies it to the terminal 4 to confirm whether or not there is a transmission request, and for confirmation that the data packet DT (SDT) has been received. If the data packet DT (+ RSP) is generated and sent to the packet switching network 2, the interface unit 6 receives it via the packet switching network 2 and confirms that it is included in the packet DT (+ RSP) of the data. Data R for
The SP is generated and supplied to the host body 5.

<< Data Transfer Phase >> After that, the terminal 4 issues a station opening request message, the protocol conversion device 3 issues a data packet DT having the station opening request message as transmission data, and sends it to the packet switching network 2. The interface section 6 receives this via the packet switching network 2, reproduces the opening request message included in this data packet DT, and supplies it to the host body 5.

Thereafter, the host main body 5 starts the opening process, and outputs the response signal RSP indicating that the opening has started.
In response to this, the interface unit 6 causes the data packet D
When T (SDT) is output and sent to the packet switching network 2, the protocol conversion device 3 receives it via the packet switching network 2 and generates a response transmission code ACK indicating that the open processing is started. Is supplied to the terminal 4.

When the terminal 4 issues a transmission end transmission code EOT indicating the end of transmission, the protocol conversion device 3 determines that the transfer of one text data is completed.

After that, if the host main body 5 creates the response message by the opening process, and the interface unit 6 creates the data packet DT and sends it to the packet switching network 2,
The protocol conversion device 3 receives this via the packet switching network 2 and selects a select transmission code SEL for designating a station.
Is generated and supplied to the terminal 4.

Then, the terminal 4 sends the select transmission code S
When the response transmission code ACK indicating that the selection of the station designated by EL is completed, the protocol conversion device 3 determines that the station selection process of the terminal 4 is completed and generates a response message, which is generated by the terminal 4 To display transaction images etc.

After that, the terminal 4 outputs the response transmission code ACK, and the protocol conversion device 3 uses the response transmission code ACK as the transmission data RSP in the data packet DT (+ RS).
P) is generated and sent to the packet switching network 2, the interface unit 6 receives it via the packet switching network 2 and reproduces the response content contained in the data packet DT (+ RSP). Is supplied to the host body 5.

When this processing is completed, the protocol conversion device 3 generates a transmission end transmission code EOT and supplies it to the terminal 4.

<< Disconnection Phase >> After that, the protocol conversion device 3 generates the polling request transmission code POL and supplies it to the terminal 4 to confirm the presence or absence of the transmission request.

Then, if the terminal 4 issues a closing request message, the protocol conversion device 3 generates a data packet DT having the closing request message as transmission data, and sends this to the packet switching network 2, the interface section 6 receives the data. The data packet DT is received by receiving it via the packet switching network 2.
The closing request message included in the above is reproduced and supplied to the host body 5.

After that, the host main body 5 starts the closing process for the terminal 4 side and outputs the response signal RSP indicating that the closing process is started, and the interface unit 6 correspondingly sends the data packet DT (+ RSP). When the packet is generated and sent to the packet switching network 2, the protocol conversion device 3 receives it via the packet switching network 2 and generates a response transmission code ACK indicating that the closing process has been started, and this is transmitted to the terminal 4 Supply to.

Then, the terminal 4 transmits the transmission code E
If the OT is output, the protocol conversion device 3 will receive this terminal 4
And stop polling.

After that, the host body 5 outputs the data REST necessary for resetting the terminal 4 side, and the interface unit 6 correspondingly sends the data packet DT (R
EST), the packet switching network 2 captures it and supplies it to the protocol converter 3.

Then, if the protocol conversion device 3 generates a confirmation packet DT (+ RSP) indicating that the data packet DT (REST) has been received and outputs this to the packet switching network 2, the interface section 6 will Confirmation data RSP included in this packet DT (+ RSP) by receiving it via the packet switching network 2
Is generated and is supplied to the host body 5.

After this, the host unit 5 sends the data UNBin.
When the interface unit 6 outputs a data packet DT (UNBind) in response to the packet d, the packet switching network 2 captures the packet and supplies it to the protocol converter 3.

Then, if the protocol conversion device 3 generates a confirmation packet DT (+ RSP) indicating that the data packet DT (UNBind) has been received, and outputs this to the packet switching network 2, the interface section 6 will Confirmation data R included in this packet DT (+ RSP) by receiving it via the packet switching network 2
The SP is generated and supplied to the host body 5.

After that, when the host main body 5 issues the restoration request data and the interface section 6 issues the restoration request packet CQ, the packet switching network 2 generates the disconnection instruction packet CI and supplies it to the protocol conversion device 3. To do.

Then, when the protocol conversion device 3 receives the disconnection instruction packet CI, generates a recovery confirmation packet CF indicating that the disconnection processing has been performed, and outputs this to the packet switching network 2, the interface unit 6 causes the packet to be transmitted. When this is received via the exchange network 2 and it is determined that the online processing is completed, the communication processing is completed.

As described above, in this embodiment, when the communication between the terminal 4 and the host 1 is performed via the packet switching network 2, the protocol conversion device 3 uses the protocol on the host 1 side and the protocol on the terminal 4 side. Since the protocol is converted to support the communication, even if the host 1 side supports the HDLC protocol and the terminal 4 side supports the asynchronous basic procedure, the host does not need to be changed on the terminal 4 side. 1 side procedure and terminal 4
Side procedures can be compatible, which can significantly reduce the cost and time required for procedure compatibility.

Further, in the above-mentioned embodiment, the point-to-point communication is carried out. However, the line may be used more effectively by carrying out the multi-drop communication.

[0041]

As described above, according to the present invention, even if the host side supports the protocol of the HDLC procedure and the terminal side supports the asynchronous basic procedure, the procedure on the host side can be performed without changing the terminal side. And the procedure on the terminal side can be compatible with each other, which can significantly reduce the cost and time required for the procedure compatibility.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a packet switching network system according to the present invention.

FIG. 2 is a sequence diagram showing an operation example of the packet switching network system shown in FIG.

FIG. 3 is a sequence diagram showing an operation example of the packet switching network system shown in FIG.

[Explanation of symbols]

 1 host 2 packet switching network 3 protocol converter 4 terminal

Claims (1)

[Claims] 1. A packet switching network system that supports communication between a host side and a terminal side via a packet switching network, wherein the host side supports an HDLC protocol and the terminal side supports an asynchronous basic procedure. A packet switching network system comprising a protocol conversion device that is interposed between the terminal and the packet switching network and is compatible with the procedure on the host side and the procedure on the terminal side.