JP2526694B2 - Data communication system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to data communication, for example, to a data communication system for investigating and collecting powder addresses of data terminals accommodated in a packet communication network.

[Conventional technology]

In general, data communication inside a single office is
This is often done by building a local area network (LAN). 1 in this local area network
A plurality of data terminals are arranged around a single data communication device, and communication is performed by transmitting and receiving packet format data via a packet transmission path. Unique data terminal addresses are set in advance for these data terminals,
The data packet is sent after setting its own data terminal address and the other party's data terminal address. Therefore, in order to know the address of the destination data terminal prior to data transmission, it is necessary to check the destination data terminal address each time transmission is performed. In a conventional data communication system, such an address check is performed by the transmitting operator actually operating the destination data terminal or by inquiring the operator of the destination data terminal using an extension telephone or the like. I was getting used to it.

[Problems to be Solved by the Invention]

As described above, in the conventional data communication system, in order to check the address of the data terminal of the transmission destination, it is necessary to go to the data terminal of the transmission destination or make an inquiry to the operator of the data terminal of the transmission destination by telephone or the like. there were. For this reason, there is a drawback in that it is extremely troublesome and time-consuming to check the terminal address of the transmission destination, especially when data terminals are arranged on a plurality of floors.

Therefore, a first object of the present invention is to provide a data communication system capable of easily displaying the correspondence between the data terminal address set in the data terminal and the terminal address stored in the data communication device. is there.

A second object of the present invention is to provide a data communication system capable of investigating addresses only when necessary.

[Means for solving the problem]

In the invention according to claim 1, (a) a packet transmission path for transmitting a data packet including destination terminal address information indicating a destination terminal address and source terminal address information indicating a source terminal address, and (b) Terminal address management means for managing addresses of all data terminals in the packet communication network constituted by this packet transmission path,
(C) An accommodating terminal address storage circuit that stores the address of the data terminal that it accommodates as an accommodating terminal address,
An address comparison circuit for comparing the source terminal address of the data packet received from the data terminal accommodated in itself and the destination terminal address of the packet data fetched from the packet transmission path with the accommodation terminal address stored in the accommodation terminal address storage circuit, When the comparison result transmission terminal address by the address comparison circuit and the accommodated terminal address do not match, an address mismatch notification circuit for notifying the terminal address management means to that effect, and the comparison result destination terminal address by the address comparison circuit and the terminal accommodation address are A plurality of data terminal accommodating means including a data packet transmitting circuit for transmitting the data packet to the data terminal accommodated by itself when the two coincide, and (d) a maintenance means for managing the accommodating terminal address connected to the terminal address managing means. And the data communication system .

That is, in the invention described in claim 1, when the source terminal address of the data packet from the data terminal and the accommodated terminal address do not match, the fact is notified to the terminal address management means, and the destination terminal address of the data packet from the packet transmission path is notified. And the terminal accommodating address match, the data packet is to be sent to the data terminal accommodated by itself. The terminal address management means centrally manages the addresses of all the data terminals in the packet communication network, and the maintenance means for maintaining the address of each data terminal is connected to this terminal address management means, and the centralized maintenance is performed. Is to be done.

〔Example〕

 The present invention will be described in detail below with reference to examples.

FIG. 1 shows a data communication system according to an embodiment of the present invention. The data communication device 11 of this system is provided with data terminal accommodating circuits 13 and 14 connected to the high-speed packet bus 12, and data terminals 15 and 16 are respectively provided.
Is housed. These data terminal accommodation circuits 13 and 14 are connected via a control data communication path 17 to a terminal address management circuit 19 which accommodates a maintenance terminal 18.

FIG. 2 shows the data terminal accommodation circuit 13 of FIG. 1 in detail. This circuit is provided with an address comparison circuit 21, which connects the high speed packet bus 12 and the data terminal 15. Further, the address comparison circuit 21 is connected to the control data communication path 17 via the address mismatch notification circuit 22 and is also connected to the accommodated terminal address storage circuit 23. Further, the data terminal accommodating circuit 14 of FIG. 1 has the same configuration.

The operation of the data communication system having the above configuration will be described. First, before starting the operation, the operator inputs the data terminal address 26 as the address of the data terminal 15 from the maintenance terminal 18. This data terminal address 26 is
It is transferred to the data terminal accommodating circuit 13 via the terminal address management circuit 19 and the control data communication path 17, and is input to the accommodating terminal address storage circuit 23 (FIG. 2) provided therein. At this time, in the terminal address management circuit 19, the input data terminal address 26 and the accommodation terminal address storage circuit
The accommodation terminal address 27 as the address actually stored in 23 is stored in association with the data terminal accommodation circuit management number 28.

FIG. 3 shows a management table provided in the terminal address management circuit 19. In this management table 29, the accommodation terminal address 27 and the data terminal address 26
And are registered together with the data terminal accommodating circuit management number 28.

In this way, the data communication device 11 is initialized.

Next, with reference to FIG. 5, an operation for fetching a data packet from the high speed packet bus 12 to the data terminal 15 during system operation will be described. First, the data terminal accommodation circuit 13
The data packet 31 flowing through the high-speed packet bus 12 is taken in and input to the address comparison circuit 21 (FIG. 2) (step in FIG. 5).

FIG. 4 shows the data format of the data packet 31 flowing on the high-speed packet bus 12. As shown in this figure, a head flag 34 indicating the head of the data packet and an end flag 35 indicating the tail are provided at the head and tail of each data packet. Head flag
A destination terminal address 36 indicating a transmission destination, a transmission terminal address 37 indicating a transmission source, and a user data section 38 follow the 34, and a control section 39 including various control codes is further provided.

The address comparison circuit 21 refers to the destination terminal address 36 of the fetched data packet 31 (step in FIG. 5) to judge whether or not this data packet is a broadcast packet. If it is a broadcast packet (step; Y),
This is directly transferred to the data terminal 15 (step). If it is not a broadcast packet (step;
N), destination terminal address 36 and accommodation terminal address storage circuit 2
The accommodation terminal address 27 stored in 3 is compared (step). If these match (step
; Y) The data packet is transferred to the data terminal 15, and when they do not match (step; N), the data packet is discarded (step), and the next data packet is taken in (step).

Next, the operation when the data packet is transmitted from the data terminal 15 will be described with reference to FIG. First, the data terminal
When the data packet 32 of the format shown in FIG. 4 is transmitted from 15 (step in FIG. 6), this data packet is sent to the address comparison circuit 21 (second
(Figure) is entered. The address comparing circuit 21 compares the source terminal address 37 of the received data packet with the accommodating terminal address 27 stored in the accommodating terminal address storage circuit 23 (the same figure) (step). When they match (step; Y), the data packet 32 is sent out on the high-speed packet bus 12 (step). On the other hand, when they do not match (step; N), the data terminal address 26 (FIG. 3) recognized by the data communication device 11 is different from the address of the data terminal 15 actually used by the user. Judge and prohibit the transmission of the data packet. Such a mismatch is caused, for example, by an error in the operator's input when initializing the data communication device 11, or when the user of the data terminal 15 carelessly performs an address changing operation after the initial setting. Etc.

In this case, the address comparison circuit 21 notifies the address mismatch notification circuit 22 (FIG. 2) that the comparison result is mismatch (step). Receiving this, the address mismatch notification circuit 22 generates address mismatch information 41 based on the source terminal address 37 of the received data packet 32, that is, the actual address of the data terminal 15, and the terminal via the control data communication path 17. It is sent to the address management circuit 19 (FIG. 1) (step).

The terminal address management circuit 19 extracts the terminal address of the data terminal 15 from the received address mismatch information 41 and updates the data terminal address 26 of its own management table 29 (FIG. 3). Here, when the notification mode of the terminal address management circuit 19 is set to automatic (step; Y), the terminal address management circuit 19 uses the updated data terminal address 26 to manage the data terminal accommodation circuit in the management table 29. It is sent to the maintenance terminal 18 together with the number 28 and the accommodation terminal address 27 (step). As a result, such information is output from the output device (not shown) connected to the maintenance terminal 18. Further, when the notification mode of the terminal address management circuit 19 is not freely set (step; N), the operator issues a verification request from the maintenance terminal 18 (step; Y).
Data terminal address 26, accommodation terminal address
27 and the data terminal accommodating circuit management number 28 are sent out,
It is output from the output device of the maintenance terminal 18. This notification mode is set by the operator in advance via the maintenance terminal 18.

In the present embodiment, the data terminal 15 and the data terminal accommodating circuit 13 that accommodates the data terminal 15 are described.
The operations of 16 and the data terminal accommodating circuit 14 accommodating the same are the same.

〔The invention's effect〕

As described above, according to the present invention, since the address management means for managing the addresses of all the data terminals in the packet communication network is arranged, it is possible to centrally manage the address mismatch. You can Moreover, since the maintenance means for maintaining the address of each data terminal is connected to the address management means, it is easy to find a mismatch between the terminal address set in each data terminal and the terminal address stored in the communication device of the other party. It has the effect that it can be analyzed and the address of the data terminal can be input.

[Brief description of drawings]

The drawings are for explaining one embodiment of the present invention, in which FIG. 1 is a block diagram showing a data communication system, and FIG. 2 is a block diagram showing details of a data terminal accommodation circuit of FIG. FIG. 3 is an explanatory view showing a management table of the terminal address management circuit of FIG. 1, FIG. 4 is an explanatory view showing a format of a data packet, and FIG. 5 is a flow chart for explaining an operation when fetching a data packet, FIG. 6 is a flow chart for explaining the operation when transmitting a data packet. 11 …… Data communication device, 12 …… High-speed packet bus, 13,14 …… Data terminal accommodation circuit, 15,16 …… Data terminal, 17 …… Control data communication path, 18 …… Maintenance terminal, 19 …… Terminal Address management circuit, 21 ... Address comparison circuit, 22 ... Address mismatch notification circuit, 23 ... Accommodating terminal address storage circuit, 29 ... Management table.

Claims (1)

(57) [Claims] 1. A packet transmission line for transmitting a data packet including destination terminal address information indicating a destination terminal address and transmission terminal address information indicating a transmission source terminal address, and a packet formed by this packet transmission line. Terminal address management means for managing addresses of all data terminals in the communication network, accommodating terminal address storage circuit for storing the address of the data terminal accommodated by itself as an accommodating terminal address, and receiving from the data terminal accommodated by the self Address comparison circuit for comparing the source terminal address of the data packet and the destination terminal address of the packet data fetched from the packet transmission line with the accommodation terminal address stored in the accommodation terminal address storage circuit, and the comparison result by this address comparison circuit The originating terminal address and the accommodating terminal address Address mismatch notification circuit for notifying the terminal address management means to that effect when there is a mismatch, and when the destination terminal address and the terminal accommodation address match as a result of the comparison by the address comparison circuit, the data packet is Data comprising a plurality of data terminal accommodating means composed of a data packet transmitting circuit for transmitting to a data terminal accommodated in itself, and holding means connected to the terminal address managing means for managing the accommodating terminal address Communications system.