Importance

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Abstract

A LAN connector 30 inserted between a high level equipment 11 and low level equipment 21, and incorporating only protocols for the first layer or up to the second layer for OSI to enable the transmission of communication data between the high level equipment and the low level equipment, comprises a ROM 65 to store disorder notification patterns correspondent with possible disorders, and a disorder notification control portion 51 which monitors an upside-originated idle signal from the high level equipment 11, or a downside-originated idle signal from low level equipment 21 using the protocol for the first layer; detects a disorder involving a component of the network as well as a disorder involving the LAN connector itself based on the monitoring result of the upside- or downside-originated idle signal; reads out from ROM a disorder notification pattern correspondent with the disorder thus detected; and transmits the pattern to the high level equipment 11 via an optical cable 70. Thus, this LAN system can detect a disorder involving a component of the network (disorder involving a communication route), by only using a physical layer or the fist layer.

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First Claim