JPS62185435A - Transmission control system for network - Google Patents

Abstract

PURPOSE:To suppress the traffic by setting a fetch flag in fetching a data sent from a processing unit in its own node equipment, resetting the flag when the transmission of the data is finished to all adjacent node equipments and inhibiting the data transfer from a processing unit to a transmission control unit while the said flag is being set. CONSTITUTION:When a data is given to a reception buffer (RB) 121c from a processing unit (PU) 11, a data control flag is set. No data is given to the RB 121c until the flag is reset. The data is transferred to a queue 124 from the RB 121c by a reception control unit RCU 125. In this case, the RCU 125 sets a reception finish flag corresponding to the RB 121c in a data management table (DMT) 123. After the data in the queue 124 is extracted by a transmission control unit (SCU) 126, a transmission finish flag corresponding in the DMT 123 is set. In this case, the SCU 126 monitors a transmission line 2 through a transmission supervisory control table 127 and the SCU 126 and when the transmission line 2 is not busy, the data is sent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a network transmission system suitable for regulating the amount of message traffic flowing through a network such as a computer network to an appropriate amount.

(Background of the Invention) Conventionally, when the traffic is large, transmission line contention frequently occurs, resulting in a significant drop in transmission efficiency. Therefore, it is necessary to suppress the amount of traffic.

The present invention relates to an invention by the same applicant and is an improvement of Japanese Patent Application Laid-Open No. 59-763.

[Purpose of the invention]

An object of the present invention is to provide a network transmission control system suitable for suppressing an increase in traffic.

[Summary of the invention]

The present invention sets an import flag when importing data sent from a processing device within its own node device.

It is reset when the data has been transmitted to all adjacent node devices, and traffic is suppressed by not transferring data from the processing unit to the transmission control unit while the flag is on.

[Embodiments of the invention]

FIG. 1 is a system configuration diagram of an embodiment of the present invention. 1st
In the figure, 1 is a node device, and 2 is a transmission line. 6 Each node device @1 transmits to other node devices 1 through the transmission line 2. 6 Transmission is sent to an adjacent node device 1 by a broadcast method.

FIG. 2 is a configuration diagram of the node device 1. In FIG. 2, 11 is a processing unit (hereinafter referred to as PI), 12 is a transmission control unit (hereinafter referred to as CM), 21 is a reception port, and 22 is a transmission port. Data from other node equipment 1 is The data is taken into the CM 12 via the reception port 21, and the CM 12 transmits it to the other node device 1 from the transmission port 22.

υ PIFII controls the node device 1 and performs functional processing of the node device.

FIG. 3 is a diagram showing a data transmission format.

41 is the type code area (hereinafter referred to as FC) of the data; 42
is the source node device address area of the data (hereinafter referred to as S
A), 43 is a data sequence number area (attached to each source, hereinafter referred to as C), 44 is a timer area (hereinafter referred to as 7), and 45 is a message area (hereinafter referred to as ■).

Next, the operation of CYL2 will be explained, but to avoid complexity, the explanation will be based on the configuration shown in FIG. 4. Figure 5 shows C! 71
FIG. 2 is a configuration diagram of No. 2. The symbols in FIG. 5 are the same as in FIG.
22 are all transmission buffers (hereinafter referred to as SB), 123 is a data management table (hereinafter referred to as DMT), 124 is a queue, 1
25 is a reception control unit (hereinafter referred to as +RC?), 126 is a transmission control unit (hereinafter referred to as 5CV), and 127 is a transmission line monitoring control table.

The RC machine 125 has RB 121 a, 12 l b
.

121c, refer to DMT 123, and if necessary 5B 122a, 122b.

122c. Delete if unnecessary. Also, DM
Update T123.

The SC machine 126 retrieves data from the queue 124,
See DMT 123, if necessary 5B122a,
122b and 122c.

Delete if unnecessary.

Figure 6 shows the configuration of DMT 123.
231 is the SA area 1232 where the data is classified as a number area (remainder of 3 of C43 of data), 1233 is a received flag (a=c corresponds to a - c of RB 12 L), 1234 is a sent flag Flag (a = c is 5B12
(corresponding to a-c of 2).

When data enters RB 121c from RVII, the data control flag is set. Thereafter, data that is not entered into RB 121c until this flag is reset is stored in RB 12. , L c to the queue 124 by the RC machine 125 . At this time, RC ¥125 is DM
Set the received flag corresponding to RB 121c in T 123. Data in queue 124 is SC¥12
After being retrieved by DMT 6, the corresponding sent flag in DMT 123 is set. At this time, SC Ma126
Transmission line 2 is monitored through the transmission line monitoring control table 127, and if transmission line 2 is usable (transmission is possible), transmission is performed. After transmission is completed, the transmitted flag is set and this data is deleted. However, this data is RB121c
If the data has passed through, reset the u data control flag. From then on, substitute 11 is RB
121c.

For how long the data control flag is set.

It changes according to the amount of traffic within C1. In other words, when traffic is already large, the influx of new data is suppressed and traffic growth is suppressed.

The details above have been explained using a bus as an example of a transmission path, but the same applies to a so-called store-and-forward type transmission method in which only adjacent nodes are connected. ).

〔Effect of the invention〕

According to the present invention, the next self-transmitted data is not transmitted until the data transmitted from the source node device is completely transmitted to the node device connected to the source node device, thereby reducing the traffic of the entire system. It has the effect of suppressing the increase.

[Brief explanation of drawings]

FIG. 1 is an overall block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of a node device of the present invention, FIG. 3 is a diagram showing a transmission data format of the present invention, and FIG. 4 is a simplified diagram of an embodiment of the present invention. Fig. 5 is a block diagram of the transmission control unit, Fig. 6 is a diagram of the entire configuration.
The figure is a configuration diagram of a data management table. DESCRIPTION OF SYMBOLS 1... Node device, 2... Transmission line, 11... Processing device unit, 12... Transmission control unit, 121...
...Receive buffer, 122...Send buffer, 123
...Data management table, 124...Queue, 12
5...Receiving (n control unit, 126...Transmission control unit, 127 early l Country $ 3 Obstacle No. 4 Item No. 6 Figure

Claims (1)

[Claims] In a network in which a plurality of node devices each having a plurality of transmission and reception ports are arbitrarily connected by the transmission and reception ports,
When transmitting from an arbitrary node device, the same message is simultaneously transmitted to a plurality of node devices connected to the transmission port via one or more predetermined transmission ports, and the message is transmitted from the node device to the above-mentioned node device. In a transmission method that transmits a message by repeating the transmission again according to the procedure,
A network transmission control method that suppresses traffic by not importing messages sent from a processing device within a local node until the previous message sent by the local node has been sent to all adjacent node devices.