高効率なポーリング手順によるデータ通信 - SENSORMATIC ELECTORONICS CORPORATION

Title:

高効率なポーリング手順によるデータ通信

Document Type and Number:

Japanese Patent JP3767904

Kind Code:

B2

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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Inventors:

Schulz, Stephen W

Application Number:

JP53577896A

Publication Date:

April 19, 2006

Filing Date:

May 17, 1996

Export Citation:

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Assignee:

SENSORMATIC ELECTORONICS CORPORATION

International Classes:

H04L12/403; H04L12/28; H04N7/18

Domestic Patent References:

JP7079241A

Attorney, Agent or Firm:

Yuzo Yamazaki
Kiko Okada

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