JPH05316130A - Loop atm communication node - Google Patents

Abstract

PURPOSE:To provide communication nodes in which multiple access of a broadcast format is easily realized in a loop LAN employing the ATM communication system. CONSTITUTION:A multiple communication address and a usual address are identified from connection information of cells on a loop LAN. A multiple communication address identification circuit 100 and a communication address identification circuit 200 fetch a multiple communication address and a usual address addressed to its own cell into an internal reception buffer 300. An idle cell processing circuit 400 processes a relevant cell to be an idle cell in the case of the usual cell addressed to itself or the multiple communication address having been outputted precedingly to a loop by itself. A transmission section 20 receives a command from an idle cell/non-priority cell identification circuit 600 identifying whether a cell/on a loop is an idle cell or a non-priority cell and a cell insertion circuit 700 replaces a communication cell stored in a transmission buffer 500 with an idle cell (or non-priority cell) to insert a cell onto the loop.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an ATM (Asynchr)
The present invention relates to a loop-type ATM communication node that supports a broadcast function such as broadcasting in a loop-type communication network that uses an unknown Transfer Mode system.

[0002]

2. Description of the Related Art In the conventional packet communication system, the packet length is relatively long and variable, and the transmission / switching operation is performed by software.

On the other hand, a method of transferring all information in units of fixed length packets (hereinafter referred to as cells) is A
It is called the TM system, which can handle voice, image, data, etc. in a unified manner, and because it is switched by hardware according to the header information defined in the cell, it is possible to transmit and exchange high-speed and wide-band information. So it is expected as future communication.

[0004]

In this conventional packet communication system, the packet length is relatively long and variable, and the transmission / exchange operation is performed by software.
There is a problem that high-speed and wide-band communication such as 0 Mbps cannot be performed.

An object of the present invention is to apply a loop type LAN (Local Area Ne) to which the ATM communication method is applied.
A loop ATM for easily realizing communication in a broadcast format in which the same cell is distributed from a certain node in the LAN to a plurality of nodes in the same loop. Providing a communication node.

[0006]

A loop type ATM of the present invention
The communication node performs cell communication according to the header information A
The receiving side in the louvered communication system using the TM system stores a broadcast address identification circuit for identifying a broadcast address, a communication address identification circuit for identifying a communication address of a cell other than the broadcast cell, and cell data on the loop. A receiving buffer for temporarily storing, and an empty cell conversion circuit for converting an effective cell on the loop into an empty cell, the transmitting side temporarily stores a cell to be transmitted, and a transmitting buffer on the loop. An empty cell / non-priority cell identification circuit for identifying the empty cell or the non-priority cell, and a cell insertion circuit for inserting the cell on the loop are provided.

Then, the reception buffer operates either when the input cell is identified by the communication address identification circuit as the cell addressed to itself or when the broadcast address identification circuit identifies the cell as addressed by the broadcast address identification circuit. The cell is sometimes incorporated.

Further, the empty cell conversion circuit detects when the input cell is identified by the communication address identification circuit as a cell addressed to itself and when the broadcast address identification circuit identifies the cell as a broadcast cell transmitted by itself. It is characterized in that the corresponding cell is converted to an empty cell at any time.

Further, the cell insertion circuit reads out a cell from the transmission buffer and inserts cell data on the loop when a vacant cell / non-priority cell identification circuit detects a vacant cell or a non-priority cell. Characterize.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a loop type ATM communication node of the present invention.

In the figure, the broadcast address identification circuit 10
0 refers to the address information in the routing information of the input cell 1 from the loop LAN side input to the receiving unit 10, and the cell is a broadcast cell addressed to itself, or the same cell that was previously transmitted to the LAN. Identify whether it is a news cell. At the same time, the communication address identification circuit 200 looks at the address information in the routing information and identifies whether the cell is a normal cell (not a broadcast cell) for itself. Receive buffer 30
0 receives an instruction from the broadcast address identification circuit 100 or the communication address identification circuit 200, and takes in cell data when the input cell 1 is a broadcast cell addressed to itself or a normal cell. The reception buffer 300 is read out as needed and taken out as an output cell 2 to the node side. The empty cell conversion circuit 400 receives an instruction from the communication address identification circuit 200 and the broadcast address identification circuit 100, and the cell is a normal cell destined for itself, or a broadcast cell previously output as cell output 4 to the LAN side by itself. In either case, the corresponding cell on the loop is made an empty cell. On the other hand, the input cell 3 input from the node side is the transmission buffer 500.
Is temporarily stored in. In the transmission unit 20, the cell insertion circuit 70 receives an instruction from the reception unit 10 from an empty cell / non-priority cell identification circuit 600 that monitors whether a cell in the loop connected to the transmission unit 20 is empty or a non-priority cell.
0 is an empty cell or a non-priority cell and a transmission buffer 500
Replaced with the cell data read from the loop LAN
The output cell 4 is sent to. Needless to say, the non-priority cells may be considered in multiple classes as necessary, and the non-priority cells may not be handled.

[0012]

As described above, according to the present invention, the receiving side has a broadcast address identifying circuit for recognizing a broadcast address, a communication address identifying circuit for identifying a communication address of a cell other than the broadcast cell, and a loop. A reception buffer that temporarily stores the cell data of, and an empty cell conversion circuit that converts the effective cells on the loop into empty cells, and the transmission side has a transmission buffer that temporarily stores the cells to be transmitted, An identification circuit for identifying an empty cell or a non-priority cell on the loop and a cell insertion circuit for inserting a cell on the loop are provided. It has a function to take in a cell when it is identified as a cell addressed to it or when the broadcast address identification circuit identifies it as a broadcast cell addressed to itself, and the empty cell conversion circuit communicates the input cell with the communication address. When the address identification circuit identifies the cell addressed to itself or when the broadcast address identification circuit identifies the broadcast cell transmitted by itself, it has the function of converting the corresponding cell into an empty cell, and the cell insertion circuit has an empty cell. ATM having a function of reading a cell from a transmission buffer and inserting cell data in a loop when a non-priority cell identification circuit detects an empty cell or a non-priority cell
It is possible to easily realize a communication node for constructing a loop type LAN to which a communication system is applied, in particular, a broadcast type communication in which the same cell is distributed from a certain node in the LAN to a plurality of nodes in the same loop. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a loop type ATM communication node of the present invention.

[Explanation of symbols]

 1,3 input cells 2,4 output cells 10 receiving unit 20 transmitting unit 100 broadcast address identification circuit 200 communication address identification circuit 300 reception buffer 400 empty cell conversion circuit 500 transmission buffer 600 empty cell / non-priority cell identification circuit 700 cell insertion circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location 8529-5K H04L 11/20 Z

Claims (4)

[Claims] 1. A for performing cell communication according to header information
The receiving side in the louvered communication system using the TM system stores a broadcast address identification circuit for identifying a broadcast address, a communication address identification circuit for identifying a communication address of a cell other than the broadcast cell, and cell data on the loop. A receiving buffer for temporarily storing, and an empty cell conversion circuit for converting an effective cell on the loop into an empty cell, the transmitting side temporarily stores a cell to be transmitted, and a transmitting buffer on the loop. A loop type A characterized by comprising an empty cell / non-priority cell identification circuit for identifying the empty cell or the non-priority cell, and a cell insertion circuit for inserting the cell on the loop.
TM communication node. 2. The reception buffer is provided either when the input cell is identified by the communication address identification circuit as a cell addressed to itself or when the broadcast address identification circuit identifies the cell as a broadcast cell addressed to itself. The loop type ATM communication node according to claim 1, wherein the cell is taken in occasionally. 3. The empty cell conversion circuit detects when an input cell is identified by the communication address identification circuit as a cell addressed to itself and when the broadcast address identification circuit identifies the cell as a broadcast cell transmitted by itself. The loop type ATM communication node according to claim 1, wherein the corresponding cell is converted into an empty cell at any time. 4. The cell insertion circuit reads a cell from the transmission buffer and inserts cell data on the loop when an empty cell / non-priority cell identification circuit detects an empty cell or a non-priority cell. The loop type ATM communication node according to claim 1, which is characterized in that.