COMMUNICATIONS LINE MONITORING SYSTEM, RELAY APPARATUS, AND COMMUNICATIONS LINE MONITORING METHOD
First Claim
1. A communications line monitoring system, comprising a plurality of relay apparatuses, and a communications line monitoring apparatus for monitoring line quality of a communication path of data transmitted between the plurality of relay apparatuses, wherein each of the relay apparatus comprises:
- an error detection unit for detecting an error in received data;
a previous error detection determination unit for determining whether or not the error detection has already been performed on the received data in another relay apparatus based on whether or not previous error detection information is added to the received data; and
an initial error detection process unit, used only when an error is detected in the received data and the error in the received data has been undetected in other relay apparatus, for notifying the communications line monitoring apparatus of error detection information of abnormality in the line, and for adding previous error detection information to data transmitted to a downstream relay apparatus.
1 Assignment
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Accused Products
Abstract
A communications line monitoring system of the present invention comprises a plurality of relay apparatus and a communications line monitoring apparatus for monitoring a line quality of a communications line of relayed data, and each of the relay apparatus comprises error detecting unit for detecting errors in received data, previous error detection determination unit for determining whether or not error detection has already been performed in other apparatus based on previous error detection information of the received data, and initial error detection process unit for, only when an error is detected and the error was undetected in other apparatus, autonomously notifying error detection information to the communications line monitoring apparatus, and for adding previous error detection information to data for transmission.
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Citations
15 Claims
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1. A communications line monitoring system, comprising a plurality of relay apparatuses, and a communications line monitoring apparatus for monitoring line quality of a communication path of data transmitted between the plurality of relay apparatuses, wherein each of the relay apparatus comprises:
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an error detection unit for detecting an error in received data; a previous error detection determination unit for determining whether or not the error detection has already been performed on the received data in another relay apparatus based on whether or not previous error detection information is added to the received data; and an initial error detection process unit, used only when an error is detected in the received data and the error in the received data has been undetected in other relay apparatus, for notifying the communications line monitoring apparatus of error detection information of abnormality in the line, and for adding previous error detection information to data transmitted to a downstream relay apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A relay apparatus for examining received data and, when an error is present in the received data, for notifying line failure to the communications line monitoring apparatus, comprising:
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an error detection unit for detecting an error of the received data; a previous error detection determination unit for determining whether or not the error detection has already been performed on the received data in another relay apparatus based on whether or not previous error detection information is added to the received data; and an initial error detection process unit, used only when an error is detected in the received data and the error in the received data has been undetected in other relay apparatus, for notifying the communications line monitoring apparatus of error detection information of abnormality in the line, and for adding previous error detection information to data transmitted to a downstream relay apparatus. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A communications line monitoring method of a communications line monitoring system, having a plurality of relay apparatuses, and a communications line monitoring apparatus for monitoring line quality of a communication path of data transmitted between the plurality of relay apparatuses, comprising:
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examining presence or absence of an error in data received by the relay apparatus; notifying the communications line monitoring apparatus of error detection information of abnormality in the communications line when an error is detected in the received data; and controlling, when the error is redetected in a relay apparatus located downstream of the relay apparatus, notification of the error detection information from the downstream relay apparatus to the communications line monitoring apparatus.
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Specification