JPH02260845A - ATM cell multiplexer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention accommodates a plurality of asynchronous transmission mode (hereinafter referred to as ATM) transmitting devices, and multiplexes the next data in a cell form from each transmitting device. This relates to an ATM cell multiplexing device for transmission.

[Conventional technology]

Conventionally, a packet multiplexing device has been used to multiplex data in the form of packets, and this device is equipped with a packet processing control device composed of a microprocessor, and the priority of each packet is determined by software processing. Based on this determination, each packet is multiplexed.

[Problem to be solved by the invention]

However, in a packet processing control device using a microprocessor, the processing speed is limited by the processing capacity of the microprocessor, and in higher-speed ATM systems, the processing capacity of the microprocessor is insufficient, and an ATM cell multiplexing device is realized. This is causing a problem that cannot be resolved.

[Means to solve problems]

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

In other words, in a multiplexer that multiplexes cells,
a cell storage circuit provided corresponding to each transmitting device to be accommodated;
A cell identification circuit is provided for each cell storage circuit to identify the type of the next cell that accumulates in the corresponding cell storage circuit, and a cell identification circuit that determines the priority according to the identification output of each of these cell identification circuits and stores the highest priority cell. The cell storage circuit is equipped with a priority control circuit that instructs the stored cell storage circuit to send out the stored contents.

[For production]

Then, in accordance with the command from the priority control circuit, the cells with higher priority are transmitted, and by repeating this, multiplexed transmission of cells is performed.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to block diagrams showing embodiments.

In the figure, an ATM cell multiplexer (hereinafter referred to as MPX
) 1 is a plurality of ATM transmitting devices (hereinafter referred to as TX) 2-1.
2-2, and MPXl accommodates TX2-1.
．． Corresponding to 2-2, a cell storage circuit (hereinafter referred to as STR) 3-
1.3-2 is provided, and 8TR3-1, 3-2
Each cell identification circuit (hereinafter referred to as DIS) 4-1.4-2. and input/output control circuit (hereinafter referred to as l0C) 5-1.5-2
In addition, a common priority control circuit (hereinafter referred to as FOR) 8 is also provided.

In this\, l0C5-1, 5-2 are 5TR3-1
゜After checking the contents of 3-2, it appears that the next transmission cell transmission request is made to TX2-1, 2-2 individually, and the corresponding requests from TX2-1 and 2-2 are made. The cells are individually stored in the corresponding 5TR3-1, 3-2, and the cells are simultaneously stored in the DIS4-1.4-2.
is also given, in which the corresponding 5TR3-1.

3-2, the type of the next cell is identified, and each identification output is given to FOR6.

FOR6 determines the priority of each cell according to the identification output from DIS4-1.4-2, and responds to the transmission request given from L0C5-1, 5-2 depending on the cell accumulation status. And, the highest priority cell is accumulated and corresponds to 7'j 5TR3! Sends a transmission command to OC5.

Note that FOR8 sends out a transmission command when the transmission stop request T is not given.

Therefore, for example, if the priority of the cell stored in 5TR3-1 is the highest and the priority of the cell stored in 5TR3-2 is the second, first, the control of 10C5-1 is performed. Yo,
! After the stored contents of 75TR3-1 are sent out as output 8, the stored contents of 55TR3-2 are sent out as output 8 under the control of l0C5-2.

In addition, l0C5-1, 5-2 are the corresponding 5TR3-1
, 3-2, the above operations will be repeated in order to issue the next transmission cell transmission request to TX2-1.2-2, sequentially starting from the highest priority cell. Sent as output 8.

Note that the number of TX2-1.2-2 can be arbitrarily determined depending on conditions.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a cell storage circuit is provided corresponding to the transmitting device, and a cell identification circuit is provided for each cell storage circuit to identify the type of cell.
The priority control circuit determines the priority according to these identification outputs and instructs the cell storage circuit that has stored the highest priority cell to send out the stored contents. This method can be realized and a remarkable effect can be obtained in cell multiplexing of the ATM system.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of the present invention. 1...ATM cell multiplexer, 2-1.2-2...
...ATM transmission device, 3-1.3-2 ...Cell storage circuit, 4-1.4-2 ...Cell identification circuit, 6.
...priority control circuit, 8...output.

Claims (1)

[Claims] A multiplexing device that accommodates a plurality of transmitting devices in an asynchronous transmission mode and multiplexes and transmits cells from each of the transmitting devices, a cell storage circuit provided corresponding to each of the transmitting devices, and the cell storage circuit. a cell identification circuit provided for each cell storage circuit for identifying the type of cells stored in the corresponding cell storage circuit; and the cell storage circuit that determines the priority according to the identification output of each cell identification circuit and stores the cells with the highest priority. An ATM cell multiplexing device comprising: a priority control circuit that instructs a circuit to send out stored contents.