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AssigneeNEC Corporation
InventorMasayoshi Tamai
Estimating the term…
In a communication network wherein a control station sends a communication test command once in each test cycle through a transmission path to a local station which sends a response signal back to the control station while kept in normal operation, the local station sends first and second response messages as the response signal while rendered idle and busy, respectively. Supplied with the first and the second response messages in one test cycle, the control station sends the communication test command to the local station in an immediately subsequent test cycle a normal and a longer test interval later, respectively. If supplied with no response signal, the control station sends the communication test command in the subsequent test cycle a shorter interval later and uses a shorter interval than a normal monitor interval in the subsequent test cycle in monitoring whether or not the response signal is received in response to the communication test command transmitted in this test cycle to the local station from which no response signal is received in the above-mentioned one test cycle. Usually, the local station is one of a plurality of local stations connected to the control station through the transmission path.
A local station monitoring method of monitoring, in a communication network comprising a control station, a local station, and a transmission path for communication between said control station and said local station, said local station by said control station with transmission of a communication test command to said local station at a test interval and with reception of a response signal from said local station as regards whether or not said local station is in normal operation, comprising the steps of:
A local station monitoring system for monitoring, in a communication network comprising a control station, a local station, and a transmission path for communication between said control station and said local station, said local station by said control station with transmission of a communication test command to said local station at a test interval and with reception of a response signal from said local station as regards whether or not said local station is in normal operation, wherein:
A control station for monitoring, in a communication network comprising besides said control station a local station and a transmission path for communication between said control station and said local station, said local station as regards whether or not said local station is in normal operation, wherein said control station comprises:
A local station monitored, in a communication network comprising besides said local station a control station and a transmission path for communication between said control station and said local station, by said control station with a communication test command transmitted from said control station to said local station at a test interval, wherein:
Dependencies are inferred from the claim text.