JPH02164155A - Communication mode for lan system - Google Patents

Abstract

PURPOSE:To improve the processing efficiency as the entire system by providing a table of a terminal equipment TE accommodated in its own processor and a cross reference table between a terminal equipment TE accommodated by another processor PRS and the PRS to each PRS and applying relay transmission to only the PRS accommodating a destination TE via a bus while referencing the cross reference table. CONSTITUTION:Tables alpha, beta, gamma of terminal equipments TE accommodated in PRS X-Z themselves and cross reference tables TX, TY, TZ between the TE accommodated by another PRS and the PRS are provided to the processors PRS X-Z. The cross reference between the PRS Z and a TE C1 is registered in the cross reference table TX of the PRS X, and when the TE A1 sends a frame C1IA1, the PRS X obtains immediately the PRS Z from the cross reference table Tx and applies relay transmission of the C1IA1 to the processor only. The PRS Z omits the registration of the cross reference table TZ and sends the frame C1IA1 to a line (k). Thus, no processing is required in an independent PRS Y and the deterioration in the processing efficiency in an excess processing is excluded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication system for a LAN system that performs communication between terminal devices using the CSMA/CD protocol.

[Conventional technology]

In the bridge-type Noshida system, multiple processors (hereinafter referred to as PH1) are connected by a bus, and each
Each H8 accommodates multiple terminal devices (hereinafter referred to as TE), and CS
Communication is carried out between each TE using the MA/CD protocol, and each PR8
When transmitting from K, it is assumed that relay transmission will be performed to all other PH1s via the bus.

[Problem to be solved by the invention]

However, during relay transmission, PH1 transfers data to other than PR8, which accommodates the destination TE, and PH1, which is not the target, also has to process this.
The drawback is that the data processing efficiency of the entire system is reduced.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention is intended to be constructed by the following means.

In other words, in the above-mentioned LAN system, each PH1 has a table of TEs accommodated by itself and a table of correspondence between TEs accommodated by other PH1s and the corresponding PR8, and TEs accommodated by the PH1 are When transmitting, refer to the correspondence table to find PH1, which accommodates the destination TE, and select this PH1.
0 [Operation] Therefore, only fcPR8 that accommodates the destination TE needs to perform data processing υ, and other PH1s do not need to perform redundant processing. Therefore, the processing efficiency of the entire system is improved. [Embodiment] The present invention will be described in detail below with reference to figures showing embodiments.

FIG. 1 is a block diagram showing the initial state, in which multiple PR
8 @ , B2.
C1 and C2 are accommodated, and each of 'rE-Al to C2 communicates with each other using the CSMA/CD protocol.

Ma7'j, PH1-X-Z is equipped with tables α, β, and r of TEs accommodated by itself, as well as correspondence tables Tx, Ty between TEs accommodated in other PH1s and the PR3.
, Tz are provided, and the correspondence table Tx-Tz is initially blank, but the contents are registered as communication is relayed.

In this case, for example, TE A1 accommodated in PR8＠
When a source address A1 and a destination address C1 are added to a frame I composed of data etc. and sent, P
Initially, H1-X was not registered because the corresponding Chiful Tx was not registered.
For the other PH1, Y, and Z, the frame C11 adds its own address to person 1 and relays it via bus l.

Then, in response to this, PH1-Y and Z register the correspondence between PR8@X and TE-AI in their respective corresponding tapes #TY and Tz, and PH1-Y and PH1-Z register their own accommodation based on table j. 7 frame I addressed to TE-CI,
Send this to the line.

Next, as shown in Figure 2, frame CI IAI+7)
In response to the reception, Tl-Cl transmits frame AI IC1 to TI@AIK, which is received and sent to 9PR8.2.
refers to the contents of the correspondence table Tz, finds 7jPR8-X that accommodates TE-AI, and relays the frame 11C1 with its own address added only to PH1-X via bus lf.

Upon receiving this, PH1,
It registers the correspondence between PR8LIz and TE-CI in x, determines that it is addressed to the TE/AI it accommodates based on table α, and transmits it to line i.

After the above two-way communication has been performed, the P
H1-XO compatible table Tx Ni PR8IIz and TE-C
The correspondence with I has been registered, and when TE-AI sends frame ellAl, PH1.X immediately obtains PH1-Z from the correspondence table Tx, and relays frame CII^1 only to this Therefore, in PR8@Z, the registration of the correspondence table Tz is omitted and the frame CI IAI is transmitted to the line.

Therefore, in the unrelated PH1-Y, the processing after FIG. 2 is unnecessary, and the reduction in processing efficiency due to redundant table processing is eliminated.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a correspondence table between TEs accommodated in other PH1s and the PR8 is provided for each PH1, and by referring to this correspondence table, the PH1 containing the destination TE is selected. By determining this and relaying it only to this PH1, unrelated PH1 does not perform redundant processing, improving the processing efficiency of the entire system, and achieving a remarkable effect in a bridge type LAN system. It will be done.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, with FIG. 1 being a block diagram in an initial state, and FIGS. 2 and 3 being block diagrams corresponding to state transitions. X, Y, zll @ @ @ Processor, AI
, A2. Bl. B2. C1, C2...fist/terminal device, l+1...bus, Tx, TY, Tz...conflict/correspondence table.

Claims (1)

[Claims] In a LAN system, a LAN system includes a plurality of processors connected by a bus and each housing a plurality of terminal devices, and communicates between the terminal devices using the CSMA/CD protocol. A correspondence table between the terminal device accommodated in the processor and the processor is provided for each processor, and when transmitting from the terminal device accommodated in the processor, the processor that accommodates the destination terminal device refers to the correspondence table. 1. A communication system for a LAN system, characterized in that the information is determined and the relay transmission is performed only to the processor via the bus.