| 摘要 |
PROBLEM TO BE SOLVED: To provide a switching hub with a delay time measurement function that measures the number of cascade connections in an entire network and a delay time required for relaying frames. SOLUTION: A memory 103 stores a table to which the number of cascade connections of switching hubs led ahead to each port is stored, the number of cascade connections of all the ports 1-4 is set to '0' in the initial state, the switching hub 101 transmits a cascade connection number notice frame, to which a value resulting from adding '1' to a maximum value of the number of cascade connections of all the ports 2-4 except a port 1 is se, from the port 1, applies the transmission processing above to all the ports 1-4 periodically, rewrites the number of cascade connections of a port receiving a cascade connection number notice frame into the number of cascade connections set to the cascade connection number notice frame when receiving the cascade connection number notice frame from other switching hub and aborts the received cascade connection number notice frame without relaying the frame.
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