A time-triggered service forwarder adapting to different transmission rates and its method

Abstract

A time-triggered service transponder and method adaptable to different transmission rates, the transponder includes a filtering module, a fully interconnected switching network module, a dispatching module, and a buffer area module. The method includes: obtaining the current window information, prefetching the next window information, opening the receiving window, receiving the data frame, judging the correctness of the service identification number, writing the data frame into the buffer area, performing a cyclic redundancy check on the data frame, and discarding the check error And the data frame whose frame length is too long, close the receiving window, read the data frame from the buffer area and output it to the outside, and modify the current window information. Under the time-triggered Ethernet standard, the present invention filters and forwards the time-triggered service data frames received by switching nodes with different transmission rates, and at the same time adopts the method of prefetching the scheduling information of the next window to reduce the input rate of the external scheduling information by the transponder demand.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a time-triggered service repeater and method adapting to different transmission rates in the technical field of network communication. The invention can realize filtering and forwarding of time-triggered service data frames of different transmission rates received by the repeater in the time-triggered Ethernet system under the time-triggered Ethernet standard. Background technique [0002] In order to meet the needs of the industrial control system for the communication capability between nodes, people hope to apply the low-cost, high-bandwidth, and high-flexibility Ethernet technology to the industrial control network. However, the transmission of data packets in the Ethernet standard is "best effort", and the real-time and integrity of key control data transmission cannot be guaranteed. In order to solve this problem, the International Society of Automata Engineers...

AI Technical Summary

Problems solved by technology

The disadvantage of this device is that the data buffer lacks the filtering function of overly long data frames and cannot discard overly long data frames, resulting in excessively long data frames occupying network bandwidth

The disadvantage of this device is that there is no buffer area for data frames inside the switching layer, and the transmission rate cannot be changed when the data frames are transmitted in the data channel inside the transponder, so the device cannot complete the forwarding of data frames with different transmission rates

The disadvantage of this method is that the scheduling module reads the next piece of scheduling information after outputting the data frame. Since the reading of the next piece of scheduling information must be completed before the start of the next forwarding, when the time interval between two forwardings is short, this method High-speed readout of scheduling information is required

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