A wired communication anti-jamming method and system

Abstract

The present invention provides a wired communication anti-jamming method and system, which relate to the technical field of communication, including: the receiving end starts the first time window when receiving a rectangular pulse for the first time, starts timing and continuously outputs timing results; the receiving end starts timing at the first time The second time window is started when at least one rectangular pulse is received again in the window, and the pulse width of the rectangular pulse is continuously collected in the second time window; the receiving end does not receive the rectangular pulse again in the first time window or judges according to the pulse width When the corresponding pulse signal is the preset pulse type or the timing result does not reach the preset time period and the corresponding pulse signal is not the preset pulse type, maintain the link connection with the sending end and continue to receive rectangular pulses; When the preset time period is reached and it is judged according to the pulse width that the corresponding pulse signal is not of the preset pulse type, the link connection with the sending end is disconnected. The beneficial effect is to effectively improve the accuracy of signal detection and avoid false links.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a wired communication anti-interference method and system. Background technique [0002] In the IEEE802.3 Clause14 10Base-T(e) standard, it is stipulated that 10Base-T(e) (10M unshielded twisted pair Ethernet) needs to have a link integrity test (Link Integrity Test) function to ensure the connectivity of the network . Specifically, when the link is idle, a 100ns link test pulse is sent every 16ms (+ / - 8ms). If the data receiver does not receive data or link test pulses within 50ms to 150ms, the link is considered The road is interrupted. In this case, data transmission, data reception, and loopback functions are disabled, but link test pulses continue to be sent and received. When two link test pulses or one data packet are received consecutively, the link is considered to be re-established. [0003] In the existing 10Base-T(e) receiver design, the above stand...

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Problems solved by technology

[0003] In the existing 10Base-T(e) receiver design, the above standards are generally followed, but in some special cases, such as MLT-3 (Multi- Level Transmit 3, three-level coding) signal, or LDS (link discovery signaling, link discovery signaling) signal, MLT-3 signal and LDS signal have a high probability of making the 10Base-T(e) receiver mistaken for Man Chester encoded data frames or link test pulses, so that false links are established, and once the link is established, because of the minimum link_loss (link failure) time specified by the 10Base-T(e) link integrity test function, that is, 50ms , compared with the continuous MLT-3 signal and LDS signal, it is still very long, resulting in basically no link_loss after the link is established. Keep the link at the local end of the link, that is, the case of a false link

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