Loop-back detecting and inhibiting method of Ethernet exchanger chip port

Abstract

The invention relates to a loop-back detecting and inhibiting method of an Ethernet exchanger chip port, belonging to the technical field of data communication. The method solves the problem that communication fault happens when loop back occurs on the port because a port of an Ethernet exchanger chip is wrongly connected to an external cable or other reasons. The technical scheme is as follows:: a loop-back detection circuit is designed outside the external chip; one interface of a control circuit is connected to a management interface of the exchanger chip and the other interface is connected to a communication port of the exchanger chip; the loop-back detection circuit transmits a data frame of special content to the communication port regularly, receives and analyzes the frame content at the port, determines that loop-back occurs at the port of the exchanger chip when the frame of the special content transmitted by the port is received, analyzes the loop-back path according to the configuration of the exchanger and the frame content, and then closes the compulsory loop-back circuit of the exchanger chip. The invention avoids the communication fault as related ports that produce loop-back are determined.

Description

Technical field [0001] The invention relates to the technical field of data communication, and is a method for judging whether each port of an Ethernet switch chip has loopback, and solving the communication failure caused by the loopback of the switch chip port. Background technique [0002] With the development of the network, the application of Ethernet switches (hereinafter referred to as switches) is very common. Switches are not only used in office and home LANs, but also broadband access in the form of Ethernet has become one of the most economical ways of Internet broadband access. [0003] The switch is composed of a switch chip (or a switch chip set) and auxiliary circuits. Each chip manufacturer has detailed circuit information. The port of the switch chip will not loop back under normal application conditions, but if the external cable is connected incorrectly or for other special reasons, once the port loops back, it will likely cause extremely serious consequences. ...

AI Technical Summary

Problems solved by technology

However, when the 2-wire port (6) is suspended or the circuit impedance does not match for some reason, the signal sent back to the P0 port by the RX line pair is strong, which will cause the P0 port to receive the data frame or online signal sent by itself. It causes the de facto self-loopback of the P0 port

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