JPH05153156A - Inflow control system for multiple transmission path - Google Patents

Abstract

PURPOSE:To ensure a logical transmission path between communication controllers connected through a multiple transmission path by each line unit. CONSTITUTION:Communication controllers (A) and (B) are constituted of multiple line control programs 20 and 21, and plural line control programs 1-4, and a network with the other communication controller is formed through a multiple transmission path 1. The multiple line control programs operate memory resources 1-4 by each line unit, and transmits the state to the communication controller at a transmission side. The multiple line control program at the transmission side controls a data transmission to the multiple transmission path, and a data input from the line control program, according to the state of the memory resource of the other side. Therefore, service isolated by each line unit can be ensured so that the influence of the shortage of the memory resource of 2 to one line can not induce the shortage of the memory resource of 2 to the other line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control system for a multiplex transmission line composed of a plurality of memory resources, and more particularly to an inflow control in a communication control device in which line data is concentrated.

[0002]

2. Description of the Related Art FIG. 6 is a schematic configuration diagram of a conventional inflow control system in a multiplex transmission line. The communication control devices (A) and (B) using the multiplex transmission line 1 are individually connected to the multiplex line control programs 2 and 3 for controlling communication between the multiplex transmission lines and the communication control devices (A) and (B). It has a plurality of line control programs (1 to 4) for controlling the lines. The data 4 coming from the multiplex transmission line 1 is transmitted to the destination line control program (3, 4) until the multiple line control program 3
It is managed by using the memory resource 6 of. The occupation time of the memory resource 6 is not constant because it depends on the state of the line. Therefore, in some cases, the memory resource 6 being used is retained in the multiplex line control program 3, and a shortage occurs.

When the multi-line control program 3 detects a shortage of memory resources, all communication control devices (A) which are transmission sources
Give notification 7 to (Multiple line control program 2) and try to eliminate the shortage.

Upon receiving the notification, the multi-line control program 2 suppresses the transmission 8 to the communication control unit (B) having a shortage of memory resources, and holds the state until the shortage release notification is received. At this time, the transmission 9 to any device other than the communication control device that has run out of memory resources is not particularly restricted.

[0005]

However, the inflow control of the multiplex transmission line performed by the conventional multiplex line control program has the following problems.

(A) The memory resources prepared by the multiple line control program cannot be equally distributed to the line control program.

(B) When data inflow is restricted due to one line control program, all other line control programs of the same communication control device are affected (data communication is stopped).

(C) If the memory resource at the transmission destination is insufficient for a long time, the used memory resource at the transmission source will be accumulated, and the influence will be widespread.

The present invention has been made in view of the above-mentioned problems, and even if the memory resources of the multiplex line control program are accumulated, the amount of data to be sent is adjusted to adjust the memory resources of other line control programs. It is an object of the present invention to provide an inflow control method for multiplex transmission lines that does not induce a shortage.

[0010]

According to the inflow control method for multiplex transmission lines of the present invention, a multiplex line control program for controlling communication between multiplex transmission lines is prepared in a communication control device for collectively controlling multiplex transmission lines. The transmission source has means for controlling data transmission by managing memory resources in units of individual lines and mutually monitoring the states.

[0011]

According to the above structure, the multiple line control program for controlling the communication between multiple transmission lines manages the memory resources in individual line units, monitors the status of each other, and controls the data transmission by means. Since the transmission source regulates the data transmission so as to prevent the accumulation of resources, it is possible to avoid that the memory resources are equally allocated to the line control program and the cause of one line control program affects the other line control programs.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram of an inflow control system for multiplex transmission lines according to an embodiment of the present invention.

In FIG. 1, the communication control unit (A) and the communication control unit (B) are connected by a multiplex transmission line 1. The multi-line programs 20 and 21 have usable memory resources (1 to 4) per line control program depending on the number of line control programs (1 to 4) implemented in the initial setting.
Determine the number of.

Further, 4 is transmission data from the communication control unit (A) to the communication control unit (B). Reference numeral 22 is a shortage notification from the memory resource 4 of the communication control device (B), and 23 is a line corresponding to the memory resource 4 of the communication control device (B) from the communication control device (A) upon receiving the shortage notification 22. This is data for suppressing transmission to the control program 4. Reference numeral 24 is a possible transmission to a line other than the transmission suppression 23, and 25 is a restriction response returned to the transmission request source based on the memory resource shortage notification 22.

Next, the operation of the memory resource and each operation when the shortage occurs / cancellation will be described.

FIG. 2 is a flow chart when the multiplex line control program of the present invention receives data from multiplex transmission lines. The multiple line control program 21 acquires the memory resource 4 for holding the received data 4, and the line control program 4
The corresponding used memory resource 4 counter X is incremented by 1 (step 101). At this time, the used memory resource counter X is compared with the number N of usable memory resources (step 102),
When X ≧ N, the number A of the communication control device (B) in which the memory resource shortage occurred and the number B of the line control program 4 are notified to all the communication control devices (A) that are transmission sources (step S). 103). However, the shortage notification 22 is only once until the state is released.

FIG. 3 is a flow chart when the multiplex line control program of the present invention transmits data to multiplex transmission lines. The multiplex line control program 20 compares the destination (communication control device number ADR1, line control program number ADR2) of the transmission data with the number notified of the shortage of memory resources (steps 201 and 202). At this time, if they do not match, transmission to the multiplex transmission line 1 can be performed (step 203). If they match, the inhibition 23 is obtained.

FIG. 4 is a flow chart when the multiplex line control program of the present invention receives a transmission request from the line control program. Upon receiving the transmission request from the line control program 2, the multiplex line control program 20 compares the destination of the transmission data (communication control device number ADR1, line control program number ADR2) with the number notified of the shortage of memory resources ( Steps 301, 302). At this time, if they match, the regulatory response 25 is returned to the request source (step 203), and if they do not match, a normal response is returned. This prevents the transmission restriction data from increasing in the multiplex line control program 20.

FIG. 5 is a flow chart when the transmission response to the line control program of the present invention is received. When the response 25 is normal, the used memory resource 4 counter X corresponding to the line control program 4 is decremented by 1 (steps 401 and 402). At this time, the used memory resource counter X is compared with the number N of usable memory resources (step 40).
3) In the case of X <N, if the memory resource shortage has occurred by then, all the source communication control devices (A) are notified that the shortage has been released (step 404).

[0021]

As described above, according to the inflow control method for multiplex transmission lines of the present invention, in a communication control system having a plurality of logical lines, a line control program having a slow processing speed causes a memory of the multiplex line control program. Even if resource retention occurs, the transmission data amount can be adjusted at the transmission source, so that the memory resource retention caused by one line does not cause a memory resource shortage of the other line control program. Therefore, an independent service is guaranteed for each line control program.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an inflow control method of a multiplex transmission line according to an embodiment of the present invention.

FIG. 2 is a flowchart of a data receiving operation from the multiplex transmission line to the multiplex line control program in the present invention.

FIG. 3 is a flowchart of a data transmission operation from the multiplex line control program to the multiplex transmission line in the present invention.

FIG. 4 is an operation flowchart when a transmission request is issued from the line control program to the multiple line control program in the present invention.

FIG. 5 is a transmission response operation flowchart when a transmission response to the line control program according to the present invention is received.

FIG. 6 is a schematic configuration diagram of a conventional multiplex transmission inflow control system.

[Explanation of symbols]

 1 multiplex transmission line 4 transmission data 20, 21 multiplex line control program 22 memory resource shortage notification 23 transmission suppression data 24 transmission data other than transmission suppression 25 regulation response

Claims (1)

[Claims] 1. In a communication control device for collectively controlling a multiplex transmission line composed of transmission lines in which a plurality of physical lines and logical lines are concentrated, a multiplex line control program for controlling communication between multiple transmission lines is prepared by a memory resource. A method for controlling the inflow of a multiplex transmission line, characterized in that the transmission source has means for controlling data transmission by managing each of them on an individual line basis and mutually monitoring the state.