JPH01208050A - Packet communication control system - Google Patents

Abstract

PURPOSE:To perform packet communication by a duplex system by fetching only a normal packet setting first-come priority in principle by transmitting a packet after attaching a number on the packet by using a duplex communication line, and comparing the numbers of the packets received from communication lines, respectively. CONSTITUTION:When the packet is transmitted, the number is attached on the packet by a number attaching means 300, and is sent from transmission means 301 or 302 to the communication line A303 or B308. The packet is received by a packet reception means 304 or 309, and is transmitted to a selection means 305 with first-come priority. The packet is fetched in sequence of first- come based on a packet number, and when the packet with the same number as that fetched already is received from another line, it is deleted. By employing such constitution, it is possible to perform the packet communication by a dual system on the duplex communication line.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a packet communication control method when performing highly reliable packet communication with duplex communication paths.

(Prior art) Conventionally, this type of packet communication control method uses a duplex method to perform packet communication using one communication channel, and when a failure in the communication channel occurs, switching to another backup communication channel is performed. We were in continuous communication.

FIG. 2 shows a conventional packet communication control method.

In FIG. 2, 1oo is a number assigning means that assigns a number to the transmitted packet. 200.

201 is a switching device, communication line A (103) and B (
109). Communication line A (1
03), 101 is a packet transmitting means that transmits a packet. 102 and 108 are connection points forming an interface between the packet transmitting/receiving means and the communication line.

105 and 107 are packet receiving means for receiving packets, and the packet receiving means 105 is transmitted to the number comparing means 104 to check the order of the packet numbers.

If the order of packet numbers is unreasonable, change the communication line to B.
You can switch to the other side and continue communication.

In this way, even in the conventional packet communication control device described above, packet communication is performed using the duplex method.

(Problems to be Solved by the Invention) However, since the conventional packet communication control method described above uses a duplex method, the line is not always in use, and the advantages of duplicating the line are not necessarily utilized. The problem was that it wasn't.

The present invention is intended to solve these conventional problems, and aims to provide an excellent packet communication control method that allows packet communication to be performed in a dual manner.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a packet communication control method for mutually performing packet communication using duplicated communication lines, including packet transmission/reception means for each communication line; Means for sequentially adding sequential numbers to transmitted packets in ascending or descending order and sending the packets to each communication line, and a means for adding serial numbers to packets received from one communication line and receiving from other communication lines. The first packet number is compared with the number added to the received packet, and the first packet number is compared with the number of the packet from other communication lines. It consists of means for making selections.

(Function) The present invention has the following effects due to the above configuration. That is, a number is assigned to a certain packet and sent to two lines. By comparing the numbers included in each packet received from two communication lines, packets are selected on a first-come, first-served basis, so packet communication can be performed in a dual system.

(Example) FIG. 1 shows the configuration of an embodiment of the present invention.

In Fig. 1, 300 is a numbering means, 301゜30
6 is a packet transmitting means, 302.307 is a connection point between the packet transmitting/receiving means and a communication line, 303.308 is a communication line A, B, 304.309 is a packet receiving means, 305
is a packet selection means based on a first-come, first-served basis.

Next, the operation of the above embodiment will be explained. In the above embodiment, when transmitting a packet, the numbering means 3
00 is added to the packet, and this packet is transmitted from the packet transmitting means 301, 306 to each communication line A (
303) and sent to B (308).

The packets received by the packet receiving means 304 and 309 from each communication line A (303) and B (308) are transmitted to the packet selection means 305 on a first-come, first-served basis,
There, packets are captured in a first-come, first-served order based on the number in the received packet, and if a packet with the same number as the number already captured is received from another communication line, the packet is discarded.

As described above, the above-described embodiment has the advantage that packet communication can be performed in a dual system over a duplicated communication line.

(Effects of the Invention) As is clear from the above embodiments, the present invention uses duplicated communication lines, assigns numbers to packets and transmits them to these communication lines, and sends packets received from each communication line to By comparing the included numbers, it has the advantage that only normal packets can be taken in on a first-come, first-served basis, and packet communication can be performed in a dual method.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a packet communication control method in an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional method. 300... Number assigning means, 301.306... Packet transmitting means, 302.307... Connection point, 30
3...Communication line A, 308...Communication line B, 3
04゜309...Packet receiving means, 305...
First-come-first-served priority packet selection means. Patent applicant: Matsushita Tonki Sangyo Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] A packet communication control method for mutually performing packet communication using duplicated communication lines includes a packet transmitting/receiving means for each communication line, sequentially adding serial numbers to the transmitted packets in ascending or descending order, and transmitting the packets to each communication line. means for transmitting each, means for comparing the number added to a packet received from one communication line with the number added to a packet received from another communication line, and means for comparing the number added to a packet received from one communication line with the number added to a packet received from another communication line, A packet communication control method comprising means for comparing packet numbers from other communication lines with packet numbers from other communication lines and selecting packets with the same number on a first-come, first-served basis.