JPH0614077A - Communication system - Google Patents

Abstract

PURPOSE:To obtain the communication system in which data with high urgency are immediately sent from a slave station to a host station in any case by securing an exclusive transmission line for the transmission data with high urgency. CONSTITUTION:A transmission data input section 26 outputs data from sensors 24-1 to 24-n obtained through a supervisory section 25 to an urgency discrimination section 27. The urgency discrimination section 27 discriminates the urgency of inputted transmission data based on an urgency discrimination table 281 and gives the result of discrimination and the transmission data to a transmission line selection section 23. The transmission line selection section 23 references a management table (1) or (2) corresponding to a current time of a timer 30 to select either an in-enterprise communication network 3 or an ISD network 4 corresponding to the urgency of the inputted data. The inputted data are sent to a host station (not shown) from a line interface 21 or 22 connecting to the selected line network.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system in which a host station and a plurality of slave stations are connected by a transmission line, and more particularly to selection of a transmission line when transmitting data from a slave station.

[0002]

2. Description of the Related Art Conventionally, in a communication system of this type, a host station and a slave station are connected to each other via a transmission line such as a communication network, and are used in a telemeter system, a security communication system and the like. In such a communication system, it is possible to prepare a transmission line having a capacity that can always transmit the information generated in the slave station, but in this case, it is necessary to prepare the transmission equipment corresponding to the maximum traffic. Therefore, there is a drawback that the operating rate of the transmission line is low relative to the investment. Moreover, the amount of information to be transmitted tends to increase year by year, and updating the transmission line to match the maximum traffic at each time imposes a large economic burden, which is economically disruptive to ordinary communication systems. It will not be possible.

For these reasons, in conventional communication systems, a transmission line having a transmission capacity commensurate with a traffic volume lower than the maximum traffic volume is usually used. Therefore, in this type of communication system, when the slave station generates more data than the transmission capacity, a part of the data is placed in a transmission waiting state, and the arrival of the data at the host station can be sent. Particularly, when a large amount of data with low urgency occurs, there is a drawback that the arrival of data with high urgency at the host station is delayed.

[0004]

As described above, in the conventional communication system of this kind, a transmission line having a transmission capacity commensurate with a traffic volume lower than the maximum traffic volume is used, and it is used depending on the urgency of information. It is not possible to immediately send highly urgent data to the host station when a large amount of transmission data is generated in the slave station because it is not possible to distinguish which transmission path is used. However, there is a drawback that various problems occur due to the delayed arrival of various data to the host station.

Therefore, the present invention eliminates the above-mentioned drawbacks and secures a dedicated transmission line for transmission of highly urgent data, so that in any case, highly urgent data is immediately transmitted from the slave station to the host station. An object is to provide a communication system capable of transmitting.

[0006]

According to the present invention, in a communication system in which a host station and a slave station can be connected via a plurality of transmission lines, a judging means for judging an attribute of data to be transmitted to the host station, The slave includes a selecting means for selecting a transmission path to be used corresponding to the attribute judged by the judging means, and a transmitting means for transmitting the data to the host station by using the transmission path selected by the selecting means. It has a configuration equipped in the station.

[0007]

In the communication system of the present invention, the determination means of the slave station determines the attribute of the data transmitted to the host station. The selecting means selects a transmission path to be used in correspondence with the attribute judged by the judging means. The transmitting means transmits the data to the host station using the transmission path selected by the selecting means.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a communication system of the present invention. Reference numeral 1 is a host station that collects data from the slave stations 2-1 to 2-n via the in-house communication network 3 or ISDN network 4, and 2-1 to 2-n is the host station 1 that collects the data collected by itself. To the slave station, 3 is the host station 1
An internal communication network connecting the slave stations 2-1 to 2-n,
Reference numeral 4 is an I connecting the host station and the slave stations 2-1 to 2-n.
It is an SDN network (public network).

FIG. 2 is a block diagram showing a detailed configuration example of the slave station shown in FIG. Reference numeral 21 is a line interface that connects the in-company communication network 3 and the transmission line selection unit 23, 22 is a line interface that connects the ISDN network 4 and the transmission line selection unit 23, and 23 is the in-company communication network 3 when transmitting data Transmission line selection unit, 24-1 to 24-, which is switched by selecting whether to use the ISDN network 4 or not.
n is a sensor for detecting, for example, opening / closing of a door in a building, opening / closing of a window, or indoor temperature, and 25 is a sensor 24-
The data 1 to 24-n are collected and transmitted to the transmission data input unit 26.
To the transmission data input unit for inputting the data obtained from the monitoring unit 25 and sending it to the urgency determination unit 27, 27 is an urgency determination unit for determining the urgency of the data to be transmitted, and 28 is A memory that stores an urgency level determination table 281 that lists data for determining the urgency level of transmission data, and a management table 29 that lists data that specifies a communication network to be used corresponding to the urgency level of transmission data. (1)
A memory for storing the management table (2) and a timer 30 for supplying the current time information to the transmission line selection unit 23. The slave stations 2-1 to 2-n all have the above-mentioned configuration.

Next, the operation of this embodiment will be described. For example, when the slave station 2-1 of FIG. 1 transmits data to the host station 1, the transmission data input unit 26 shown in FIG. 2 uses the data obtained from the sensors 24-1 to 24-n via the monitoring unit 25. Are sequentially sent to the urgency determination section 27. Urgency determination unit 27
Determines the urgency of the sent data by referring to the urgency determination table 281 in the memory 28. That is, the urgency level determination table 281 has a configuration as shown in FIG. 3, and the urgency level (a type of attribute) corresponding to the type of transmission data is shown. Therefore, when the input transmission data is 1, the urgency determination unit 27 sets the urgency of this data to A
If the transmission data is 3, the urgency level is B
To determine. The urgency determination unit 27 informs the transmission line selection unit 23 of the urgency of the data thus determined, and sends the data input from the transmission data input 26 to the transmission line selection unit 23.

The transmission line selection unit 23 refers to either the management table (1) or (2) stored in the memory 29 and performs an operation of selecting a line corresponding to the urgency of the data to be transmitted. . That is, when the transmission line selection unit 23 receives the transmission data and the urgency level information from the urgency level determination unit 27, first, the transmission line selection unit 23 displays the reference management table corresponding to the current time of the timer 30, for example, the management table (1) in the memory 28. refer. The management table (1) has a structure as shown in FIG. 4, and the line networks to be used are classified according to the urgency of the transmission data. Therefore, the transmission line selection unit 2
3 refers to the management table (1) and selects the in-company communication network 3 if the urgency of the transmission data is A, and selects the ISDN network 4 if it is B. In the above example, when the urgency of the transmission data is, for example, A, the transmission line selection unit 23 calls from the line interface 21 to the host station (not shown) via the corporate communication network 3 and the line is connected. The transmission data is transmitted from the line interface 21. When the urgency of the transmission data is B, the transmission line selection unit 23 calls the host station via the ISDN network 4 from the line interface 22, and when the line is connected, the data is transmitted from the line interface 22. Send.

Here, the relationship between the management table referred to by the transmission line selecting unit 23 and the time zone will be described. For example, the management table (1) from 8 am to 5 pm
Management table (2) from 5 pm to 8 am the next morning
, The transmission line selection unit 23 refers to the current time of the timer 30, accesses the management table to be used in that time zone, and performs the selection operation as described above. The reason for providing a plurality of management tables to refer to is that the amount of data transmitted from the slave stations 2-1 to 2-n to the host station 1 differs depending on the time of day. In this example, from 8 am to 5 pm Since there is a large amount of data, refer to the management table (1) that uses a different network depending on the urgency of the transmitted data, and the amount of transmitted data is small from 5 pm to 8 am the next morning. Therefore, regardless of the urgency of the data, the in-company communication network 3 whose line usage fee is low is used.

According to this embodiment, the slave stations 2-1 and 2-2
-N and the host station 1 are the corporate communication network 3 and ISDN network 2
Even if there is a large amount of low-urgency transmission data, the slave stations are connected by one line, and each slave station distinguishes the line network to be used according to the degree of emergency of the transmission data. Can be transmitted to the host station 1 via the in-house communication network 3. Therefore, even if the intra-company communication network 3 and the ISDN network 4 have lower transmission capacities than the maximum traffic volume, the data of high urgency as described above is immediately transmitted to the host station using the intra-company communication network 3. The host station can quickly respond to the emergency data, and the corporate communication network 3 and I can be used.
It is possible to improve the use efficiency of the SDN network 4 and prevent an increase in investment cost and the like. Further, in this example, the ISDN network 4 is not used during the time period when the amount of transmission data is small, and the in-company communication network 3 is used for all, so that the line usage fee can be suppressed to a low amount. When the communication network to be used is divided according to the attribute of the transmission data, the attribute does not have to be limited to the degree of urgency, and the same effect can be obtained even if the number of selectable communication lines is three or more. Further, there may be three or more management tables to be referred to in order to select a communication network, so that finer control can be performed.

[0014]

As described above, according to the communication system of the present invention, by ensuring a dedicated transmission path for transmitting highly urgent data, highly urgent data can be transmitted from the slave station in any case. It can be immediately transmitted to the host station.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a communication system of the present invention.

2 is a block diagram showing a detailed configuration example of a slave station shown in FIG.

FIG. 3 is a diagram showing an example of the contents of an urgency determination table stored in a memory 28 shown in FIG.

4 is a diagram showing an example of contents of a management table (1) stored in a memory 29 shown in FIG.

5 is a diagram showing an example of contents of a management table (2) stored in a memory 29 shown in FIG.

[Explanation of symbols]

1 ... Host station 2-1 to 2-n
... Slave station 3 ... Intra-company communication network 4 ... ISDN network 21, 22 ... Line interface 23 ... Transmission line selection unit 24-1 to 24-n ... Sensor 25 ... Monitoring unit 26 ... Transmission data unit 27 ... Urgency determination unit 28 , 29 ... Memory 30 ... Timer 281 ... Urgency determination table

Claims (1)

[Claims] 1. In a communication system in which a host station and a slave station are connectable via a plurality of transmission lines, a determining means for determining an attribute of data to be transmitted to the host station,
The slave includes a selecting means for selecting a transmission path to be used corresponding to the attribute judged by the judging means, and a transmitting means for transmitting the data to the host station by using the transmission path selected by the selecting means. A communication system provided in a station.