Data communication network with highly efficient polling procedure
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United States of America Patent
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Aug 19, 1997
Grant Date -
N/A
app pub date -
May 26, 1995
filing date -
May 26, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A local area data network interconnects devices which make up a video surveillance system. The devices attached to the local area network are divided into distinct classes which are polled with different degrees of frequency. Devices are dynamically reassigned from class to class depending on each device's current requirements for network access. Group polling is also employed, with resolution of contention by means of a probing algorithm. Negative responses to polling messages are formed as a series of line transitions that require less time than transmission of a single data byte. Polling messages have a distinct length in terms of bytes that is shorter than any other message transmitted on the network. Polled devices are permitted to transfer data directly to peer devices in response to polling messages.
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