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Method and apparatus for detecting the presence of a remote device and providing power thereto
| Details |
Inventors: Chang, Wen F.; Yu, Fang C.;
Assignee: Clarinet Systems, Inc. (San Jose, CA)
Primary Examiner: Auve; Glenn A.
Assistant Examiner: Wiley; David A.
Attorney, Agent or Firm: Gray, Cary, Ware & Freidenrich
A network system includes a network that detects the presence of a remote terminal connected to a network and determines the functional protocol of the remote terminal. If the remote terminal is an infrared adapter, the network hub provides electrical power to the infrared adapter and continually monitors for the presence of the infrared adapter. Upon removal of the infrared adapter, the network removes electrical power that is applied to a user interface connector that connects to the infrared adapter. If another protocol is detected for the remote terminal, the network hub communicates with the remote terminal in that protocol and converts the data to the protocol of the network. |
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DETAILED DESCRIPTION The present invention provides a detection circuit for detecting the presence of a remote device, which may or may not be a network device.
The present invention provides a system for controlling the application of electrical power to a detected device.
The system includes a signal generator and a feedback analyzer.
The signal generator receives a timing signal, a control signal, and a select signal.
The signal generator provides a presence request signal in response to the select signal being in a first logic state and provides the control signal in response to the select signal being in a second logic state.
The feedback analyzer is coupled to the detected device and provides a presence signal in response to the presence signal detected from the coupled device being of a predetermined type and being coupled to the output of the signal generator.
The feedback analyzer provides the select signal in a second logic state when such a device is detected and provides the select signal of a first logic state when such a device is not detected.
The feedback analyzer controls the application of electrical power to the coupled device of a predetermined type in response to the present signal.
The present invention provides a method for applying electrical power.
At a first detection time, a first device is an initiator and applies a symmetric bipolar signal to a second device.
At a second detection time, a feedback signal from the second device, based upon the signal supplied by the first device at the first detection time, triggers a comparator and indicates the successful connection of the second device to the first device.
Alternatively, the second device may provide the feedback signal based on another electrical power source and not based on the symmetric bipolar signal.
At a third detection time, the first device supplies a current limited electrical power to the second device.
At a fourth detection time, the second device uses the electrical power gained from the first device to sustain its own operation also use it to derive the feedback signal to replace the original signal that is provided by the first device
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