JPH0427243A - Atm cell concentrating system - Google Patents

Abstract

PURPOSE:To add the function for concentrating an ATM cell by providing a buffer memory corresponding to an input port, and a competition control circuit for inputting an output request signal outputted therefrom, and executing the competition control of an output request signal by the competition control circuit. CONSTITUTION:Now, when an ATM cell arrives in plural input ports, and is accumulated in buffer memories 1, 2, 3 and 4 corresponding to the respective input ports, the buffer memories 1, 2, 3 and 4 send out Reqs 6, 9, 12 and 15 to a competition control circuit 5. The competition control circuit 5 selects one signal, for instance, the Req 6 from in the received Reqs 6, 9, 12 and 15, and sends out an Ack 8 to the buffer memory 1 which sends out its Req 6. The buffer memory 1 which receives the Ack 8 sends out an accumulated Cell 7 to the competition circuit 5. In such a way, the Cells 7, 11, 13 and 16 accumulated in the buffer memories 2, 3 and 4 are sent out, by which the number of pieces of transmission lines can be decreased without changing a transmission speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ATM cell line concentration system, and more particularly to an ATM cell line concentration system in which an ATV cell string inputted by a plurality of input ports is outputted to a single output port.

[Conventional technology]

In conventional ATM switch networks, there is no special consideration given to the ATM cell concentration method, and if necessary, ATM
When transmitted according to the label attached to the M cell,
The idea was that automatically route selection would have the same effect as the concentrator function. However, when actually considering an ATM switch network, the input AT
The important issue was how to efficiently transmit the M cell to the next stage, and little consideration was given to making the hardware economical.

[Problem to be solved by the invention]

In the conventional ATM switch network described above, the transmission of ATM cells is taken into account, but in reality, the number of calls for ATM cells on individual lines is small, so a line concentration method is used to transfer the ATM cells without changing the transmission speed. Although it is possible to reduce the number of transmission lines that transmit ATM cells, and it is functionally satisfactory even if incorporated into the ATM switch network, until now A
Since there is no line concentration function incorporated into the configuration of the TM switch network, there is a problem in that the switch network configuration must use more hardware.

An object of the present invention is to provide a plurality of buffer memories corresponding to a plurality of input ports and a contention control circuit that inputs output request signals issued by the plurality of buffer memories, and this contention control circuit is configured to provide a plurality of buffer memories that correspond to a plurality of input ports. To provide an ATM cell concentration system that can be used in an ATV switch network to add a function of concentrating ATV cells without significantly increasing hardware by controlling competition between output request signals issued by the ATM. be.

[Means to solve the problem]

The ATM cell concentration method of the present invention is an ATV cell concentration method in an ATM switch network, which includes a plurality of buffer memories corresponding to a plurality of input ports, and a contention control circuit that inputs output request signals issued by the plurality of buffer memories. and the contention control circuit performs contention control on output request signals issued by the plurality of buffer memories, and transmits an output permission signal to one of the buffer memories that has issued the output request signal, thereby controlling the number of inputs of the plurality of inputs. This configuration realizes a line concentration function in which an ATM cell string inputted by a port is outputted to one output port.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

Buffer memory l corresponding to multiple input ports.

2.3.4 are connected to the competition control circuit 5, respectively, and can send out output request signals (hereinafter referred to as Req) 6, 9.12°15, and output permission signals ( When 8°11.14.17 (hereinafter referred to as Ack) is received, one of the received buffer memories 1, 2, and 3.4 receives ATM cell output data (hereinafter referred to as Ce1l) 7.
, 10°13.16.

Next, the operation will be explained.

Now, ATM cells arrive at multiple input ports, and buffer memories 1.2 and 3.4 correspond to each input port.
, the buffer memories 1.2 and 3.4 send Req6°9.12.15 to the contention control circuit 5.

The competition control circuit 5 receives the received Req 6, 9,
1 '2, l 5, one signal e.g. Re
Selects Req6 and sends A c k 8 to buffer memory 1 that sent Req6. The buffer memory 1 that has received Ack8 sends the accumulated Ce117 to the competition control circuit 5.

In this way, Ce1llO, 13, and 16 stored in the buffer memory 2.3.4 are sequentially sent out, thereby making it possible to reduce the number of transmission lines without changing the transmission speed.

〔Effect of the invention〕

As explained above, the present invention includes a plurality of buffer memories corresponding to a plurality of input ports, and a contention control circuit that inputs output request signals issued by the plurality of buffer memories, and this contention control circuit is configured as described above. By controlling the contention of output request signals issued by multiple buffer memories, ATM
Can be used in switch networks to achieve A without significantly increasing hardware.
This has the effect of adding a function of concentrating TM cells.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. 1.2.3.4...Buffer memory, 5...
...Conflict control circuit, 6.9.12.15...
Output request signal (Req), 7. ．． 10.13.1
6.----ATM cell output data (Ce II)
, 8, 11, 14° 17...Output permission signal (A
ck). Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] An ATM cell concentration system in an ATM switch network includes a plurality of buffer memories corresponding to a plurality of input ports, and a contention control circuit that inputs output request signals issued by the plurality of buffer memories, the contention control circuit comprising: performing competition control of output request signals issued by the plurality of buffer memories;
The present invention is characterized in that by sending an output permission signal to one of the buffer memories that has issued the output request signal, a line concentration function is realized in which the ATM cell strings inputted by the plurality of input ports are outputted to one output port. ATM cell concentration method.