JPS5970059A - Constituting device of network of multi-mode local computer - Google Patents

Abstract

PURPOSE:To stabilize the efficiency of data exchange of the whole network and to obtain a high throughput network by covering a low traffic area with a switch of a node and also covering a high traffic area with a storage device of the node. CONSTITUTION:A local computer network having plural signal input terminals 11a-11c and signal output terminals 12a-12c is formed, signal receiving devices 13a-13c receive signals and signal transmitting devices 14a-14c transmit signals. A storage device 17 in the network stores information, a signal line controlling device 16 controls a switch 15 and the switch 15 changes over the route of a signal. In accordance with the contents received by the devices 13a-13c, the low traffic area is covered with the node of the switch 15. The high traffic area is covered with the node of the storage device 17. Consequently, the efficiency of data exchange of the whole network is stabilized and a high throughput network is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a configuration device for configuring a local computer network.

Local computer network configuration devices (hereinafter simply referred to as nodes) that have been proposed in the past can be divided into store-and-forward type and non-store-and-forward type. In the store-and-forward type, when exchanging data between a pair of computers A and B, the data is stored at each node in the opposite direction reaching from A to B, and then transferred. In this method, data can be exchanged simultaneously between multiple pairs of computers, so high performance can be achieved in high-traffic areas, but performance deteriorates dramatically in low-traffic areas. On the other hand, in the non-store-and-forward type, data is exchanged using a common communication channel. Therefore, when data is exchanged between a pair of computers, it becomes impossible for another pair of computers to exchange data at the same time using the same communication path, and they must wait until that communication path is released. becomes. In addition, data collisions occur when multiple computers share a communication path, so to prevent this, each node may be equipped with a collision detection circuit or a data retransmission timing adjustment circuit, or the data transmission timing may be changed for each node. Efforts have been made to shift the numbers sequentially. However, although these methods provide good performance in low traffic areas, their performance deteriorates significantly in high traffic areas.

The present invention aims to eliminate the above-mentioned drawbacks and improves the efficiency of data exchange in the entire local computer network by covering high-traffic areas by the switches of the nodes and covering high-traffic areas by the storage devices of the nodes. The present invention provides a multimode local computer network configuration device that provides stability and improved throughput in both high and low traffic regions.

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows an example of its basic configuration, and signal input terminals 11a, 11b, and 11c are input terminals into which signals from the outside are input. Signal receiving devices 13a, 13b, and 13G receive signals from signal input terminals 11a, Ilb, and 11c, respectively.

The signal path control device 16 includes signal receiving devices 13a, 13b,
Depending on the content of the data received by 13C, the data path is set to either close the switch 15 or open the switch 15. When the switch 15 is closed, the input signal from the signal input terminal 11a is sent to the switch 15.
The input signal from the signal input terminal 1'1b passes through the switch 15 and is output from the signal output terminal 12a to the outside. During this time, the signal path control device 16 is operated by the signal receiving device 13a or the signal receiving device 13.
1) via 11a→15→'12a or 11b→
The contents of the data passing through 15→12a are constantly monitored, and the opening and closing of the switch 15 is controlled according to the contents. switch 1
The communication path control device 16 with 5 open is the signal receiving device 13
The data received by any one of a, b, and c is stored in the storage device 17.
to be memorized. The communication path control device 1G outputs the data stored in the storage device 17 to the outside via a signal transmitting device according to its destination. The configuration of the mouth shown in FIG. 1 is hereinafter referred to as a node.

FIG. 2 is an example of a local computer network configured using nodes according to this embodiment.

18a, . . . , 18d are the nodes shown in FIG. 1 according to this embodiment, and 19a1, . . . , 19d are computers. For example, when sending data from 19a to 196, the data from 19a is written to the internal storage device of -H node 18a. Next, node 18b,
If there is no data to be sent by each of nodes 18c and 18d, the data in the storage device of node 18a is transferred to node 18b,
It passes through the switch 18C and is sent to the computer 19d via the storage device of the node 18d. If node 18
b. If there is no data to be sent to 18C and the storage device of node 18d contains data to be sent, the data from computer 19a to computer 1.96 is -H.
written to the storage of node 18a, then node 18
It is written to the storage device of the C node 18c through the switch b, and it lasts until it can be written to the storage device of the node 18d, and when it becomes possible to write Pli 8 to the storage device of the node 18d. , data from the computer 19a in the storage device of the node 18c is sent to the computer 19d via the storage device of the node 18d.

FIG. 3 shows an example of the basic configuration of an f-event for carrying out the above explanation. Here, an example is shown in which a protocol based on the transmission control character of the BYSNC protocol is used. The header indicates the destination to which data is to be sent, and begins with the rsOHJ character and ends with the rETBJ character.

rcKJ is a check character. Text 1 means data to be sent, starting with rsTXJ 17 characters and ending with rETXj A7 characters.

Similarly, rCKJ is a check character. Note that here, the transmission task starts with an rENQJ request and ends with an rEOTJ.

FIGS. 4a to 4c are flowchart examples showing the operation of the node based on FIG. 3.

Hereinafter, an example of the operation of the local computer network will be shown using FIGS. 1 to 3 and FIGS. 4a to 4C. Each of the nodes 18a1..., 18d in FIG. 2 is associated with a unique label. Data is computer 1
Let us take as an example the case where data is sent from 9a to computer 19d. In this case, the destination of the header is the label 18d.

(1) Nodes 18 a , . . . , 18 d (7) When all storage devices are empty.

Computer 19a sends the rENQJ character to node 18a to send the header to node 18a. This rENQJ character is received by the C signal receiving device 13C through the signal input terminal 11c in the node 18a, and a -C interrupt request is generated from the signal receiving device 13C to the signal path control device 16.

The signal path control device 16 operates in accordance with the flowchart of FIG. 4b when the ii1' input request is received.

Here, the storage device of Note 18a is empty, so “△C
Step 53) to send the KJ character, step 54 and step 55 to receive the header and text at the receiving device 13c.
) to harm the storage device 17. Next, the node 18a transmits r, , ENQJ characters to the node 18b via the transmitter ill, waits for an "ACK" response from the node 18b, transmits a header to the node 18b, and waits for an rAcKJ response from the node 18b. Node 18b is node 18a
When the receiving device (13a) receives more rENQJ characters, if there is space in the storage device 17 (step 61
) Send the rAcKJ character back to node 18a through transmitter (14a) (step 64). node 1
At node 8a, the node 18b confirms that the rACKJ galactor has been sent from the node 18b and transmits the header to the node 18b.The node 18b receives the header from the node 18a at the receiving device (L3a) (step 64). Here, the signal path control device (16) judges whether the destination of the header is itself or not (step 65). Since the header is sent not to itself but to the node 18d, it is transmitted through the signal transmission device (14b).
The ENQJ character is transmitted to node 18c (step 68). After sending, node 18b receives r from node 18c.
It has an AcKJ response (step 69), and after receiving the rACKJ response, transmits a header to the node 18c (step 70).

Node 18b then receives rAcK from node 18c.
J response is received (step 71). When the node 18c receives the f7) rENQJ character from the node 181), the node 18d receives the f7) rENQJ character from the node 181) in the same sequence as the node 18b.
``Send the ENQJ character to node 18d
After sending the header to the node 18d, the [ACKJ
Have a response. Node 18d is rFN from node 18C
After receiving the QJ character, receive the header in the same way.

Here, the destination of the header is the own note, so node 18
step 66) to send the rAcKJ character to c;
Enter text reception mode (step 67). node 1
When 8c receives the rAcKj character from 18d, it sends the ΔCKJ character and turns on (open) the switch 15 to node 18b (step 72).
, enters rEOTJ detection mode (step 73). Node 18b follows node 1 in a similar sequence to node 18c.
After sending "ACK" to 8a, it enters rEOTJ detection mode. Node 18ar is r A from node 18b
When CK and J characters are sent, the memory device 17
The signal transmitting device 14b starts transmitting the data within. This data is shared between switch 15 of node 18b and node 18c.
The signal is directly received at the node 18d through the switch 15. After sending the rETXJ character at the end of the text transmission, the node 18a sends an rEO signal indicating the end of the data transmission operation.
Send TJ character to node 18 (I. This rEOT
The J character is monitored at nodes 18b and 18c, and nodes 18b and 18c are connected to their respective switches 15.
Set to 0FF (open).

(2) When there is no space in the storage device 17 of the node 18c In this case, the computer 19a can pass the header and text to the node 18a, and the sequence is the same as in the case (1) above. Similarly, node 18a and node 18b
The sequence in between is also the same as in the case (1) above. Next, the node 18b transmits the rENQJ character to the node 18c, but since there is no space in the storage device 17, the node 18c transmits the rWACKJ character to the node 181 (step 62). When the notebook 18b receives the rWACKJ character from the node 18c, it enters the text reception mode (step 69-WACK) (step 74), and sends the rACKJ character to the node 18a (step 75). Node 18a, which has been waiting for a response from node 18b, receives the r ACK J character and sends the text in the storage device to node 18bμ. Thereafter, the rEOTJ Kirakuta is sent and the data transfer work is completed. node 18
Node 18b, which has received the text from node a, enters the transmission mode and performs the same operations as node 18a so far, and when the storage device of node 18c becomes free, it sends the text in node 18b to node 18C and 118d.

Two examples of sending data from the computer 19a to the computer 19d have been shown above, but it is also possible to transfer data from the computer 19a to the computer 19b, computer 19c, and computer 19d in parallel at the same time. It is.

Note that the numbers of signal input terminals, signal output terminals, signal receiving devices, signal transmitting devices, switches, and storage devices in the embodiments described above are not limited at all. Therefore, the configuration of the network is not limited to a one-dimensional one, but can easily be expanded to a loop-like configuration or a two-dimensional or more-dimensional configuration. In addition, in this embodiment, one computer is connected to one node, but the number of computers connected to one node is also 0.
Needless to say, it may be just a stand or more.

In this way, the present invention distributes data to each part of the network and uses the ON state of each node's switch in low traffic areas, and automatically uses the storage device of each node in traffic areas. Compared to conventional systems, it is possible to construct a local computer network that is stable over the entire area and has high throughput.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of nodes. FIG. 2 is a local computer network 1 configured using the nodes of this embodiment. FIG. 3 is a diagram showing the transmission character format in the transmission control procedure of this embodiment. FIG. 4a is a flowchart for analyzing the state of a node, FIG. 4b is a flowchart for transferring data from a computer to a node 1-1, and FIG. 4C is a flowchart for transferring data between nodes. In the figure, 11a, b, c...signal input terminal, 12a, t+, c...signal output terminal, 13a, b, c
... Signal receiving device, 14a, b, c... Signal transmitting device, 15... Switch, 16... Signal path control device, 17... Storage device, 18a, b, c, d-... - Notebook, 19a, b, C, d - Computer. Patent applicant Educational corporation Tokai University Japan System House Co., Ltd.

Claims (1)

[Claims] A multi-local computer network configuration device interposed between computers or computer terminals that transmit and receive data, comprising a plurality of signal input terminals, a plurality of signal output terminals, a plurality of signal receiving means, and a plurality of signal input terminals, a plurality of signal output terminals, a plurality of signal receiving means, and a plurality of a signal transmitting means, an information storage means, a switching means for switching a signal path, and a signal path control means, and the data from the signal input terminal is controlled according to the content of the data received from the signal receiving means. A multi-local computer network configuration device, characterized in that the signal path control means controls which of the signal transmission ends the signal is sent to via the switching means or the storage means and the signal transmission means. number