Communication system, communication apparatus, and ring network monitoring method

摘要

A communication apparatus forming a ring network sends a test frame that is not designed to be discarded at a block point in the ring network established to discard the user frame and that is configured to have a data size randomly selected from the data sizes permitted for the user frame, from a first communication port connected to a transfer channel in a first direction in the ring network. The communication apparatus determines that the transfer status of the user frame in the ring network is normal when the sent test frame is received via a second communication port connected to a transfer channel in a second direction in the ring network in a predetermined manner.

主权项

1. A communication system provided with a plurality of communication apparatuses and configured such that a user frame sent from a user apparatus is transferred in a ring network connecting the plurality of communication apparatuses in a ring topology,
wherein selected one or more of the plurality of communication apparatuses comprise: a test frame sending unit configured to send a test frame that is not designed to be discarded at a block point in the ring network established to discard the user frame and that is configured to have a data size randomly selected from the data sizes permitted for the user frame, from a first communication port connected to a transfer channel in a first direction in the ring network; and a determination unit configured to determine that transfer status of the user frame in the ring network is normal when the sent test frame is received via a second communication port connected to a transfer channel in a second direction in the ring network in a predetermined manner; wherein the test frame sending unit sends a frame designed to be discarded at the block point as a non-pass test frame in addition to the test frame, and the determination unit determines that the transfer status of the user frame in the ring network is normal when the test frame is acquired via the second communication port in the predetermined manner and when the non-pass test frame is not acquired via the second communication port.