Method and appts. of realizing ATM general physical testing and operation interface flow shaping
A physical interface and traffic shaping technology, applied in digital transmission systems, data exchange networks, electrical components, etc., can solve problems such as the decline in the processing capacity of dedicated chips, the increase in the peak rate of cell bursts, and the lack of proposed network flow control, etc., to achieve Guarantee high-speed processing capability, smooth sending and receiving rate, and increase the effect of fault location function
Inactive Publication Date: 2005-01-12
ZTE CORP
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However, this method only controls the sending rate of cells at the source end, and does not propose a specific method for network flow control in the process of physical link transmission and at each node.
Although the average rate of cells is controlled, the burst peak rate of cells will increase significantly after passing through some access and transmission nodes, which will still cause the processing capacity of some dedicated chips to decline and the response speed to be slow
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[0051] figure 1 It is the overall structure diagram of the traffic shaping device according to the embodiment of the present invention, which is realized by FPGA. The thick line in the figure indicates the data flow direction, the thin line indicates the control signal, and the dotted line box indicates the external bus interface. It consists of devices in the inbound and outbound directions, and CPU interface devices.
[0052] As shown in the figure, in the inbound direction, that is, the transmission direction of cells from the physical interface to the switching interface, the following devices are included:
[0053] Physical interface cell receiver 11: receive cells from the UTOPIA bus of the physical interface. It is connected with the physical interface cell write buffer controller 12 and the physical interface cell buffer 13 .
[0054] The physical interface cell write cache controller 12: reads cells from the physical interface cell receiver 11, and stores the cells...
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The invention is applied between physical interface and exchange interface of ATM transmission node with UTOPIA interface for transferring cells. In incoming direction, cell receiver receives cells from physical interface based on time sequence. The cell write buffer controller stores the received cells into dual ports RAM in cell buffer. Transmission speed controller controls interval of cells to be transmitted. The cell read buffer controller reads out cells from dual ports RAM in cell buffer based on cell reading request of the cell transmitter. The cell transmitter sends cells read to exchange interface according to requirement of sending time sequence. In outgoing direction, form exchange interface to physical interface, the processing is as above said. Buffer is added in UTOPIA physical chain in order to control speed, reduces paroxysmal flux.
Description
technical field [0001] The invention relates to network flow control technology, more specifically, a method and device for realizing flow control at an ATM cell transmission node. Background technique [0002] With the rapid development of network requirements, the requirements for ATM network access are also developing rapidly. The increase of data transmission flow on the ATM network will inevitably lead to a sharp increase of cell flow on some access equipment or transmission equipment. Especially the flow of burst cell, if no measures are taken to control it, it will cause cell transmission block and reduce the processing capacity of ATM special chip. In order to make the flow of the cells meet the requirements, it is necessary to buffer the cells and control the minimum interval of cell transmission with the dedicated chip to achieve the purpose of controlling the flow. [0003] The Chinese patent No. 96195299.7 discloses an "ATM traffic adjustment" technology, which...
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IPC IPC(8): H04L47/22
Inventor 吴雪松袁爱国赵鸿海
Owner ZTE CORP