Alarm of a telecommunications terminal connected to a LAN
First Claim
1. A method of supplying power to a terminal from Ethernet equipment via first and second pairs of wires that carry data between the terminal and the Ethernet equipment, the method comprising:
- determining whether the Ethernet equipment is capable of meeting power requirements of the terminal;
if the Ethernet equipment is not capable of meeting the power requirements, sending a first signal via the first and second pairs of wires to the terminal to notify that the Ethernet equipment is not capable of meeting the power requirements, wherein the first signal comprises a difference between bias voltages applied to the first and second pairs of wires, respectively.
2 Assignments
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Accused Products
Abstract
It is advantageously taken profit of the fact that before any supply of remote power to a telecommunications terminal connected to a local area network, the Ethernet equipment must recognize the power class of said terminal by measuring a specific electrical signature of said terminal via their interconnection. In the case said Ethernet equipment will stand in a situation unable to supply the required power, then it will send a specific signal via said interconnection which will activate an alarm on said terminal. The possibility to be alerted by a specific alarm from said terminal in the case no remote power can be supplied to it, will advantageously inform the user of that terminal about the powering situation. This will prevent any confusion about the reason of a wrong running of that terminal and may allow to look for an alternative.
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Citations
20 Claims
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1. A method of supplying power to a terminal from Ethernet equipment via first and second pairs of wires that carry data between the terminal and the Ethernet equipment, the method comprising:
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determining whether the Ethernet equipment is capable of meeting power requirements of the terminal;
if the Ethernet equipment is not capable of meeting the power requirements, sending a first signal via the first and second pairs of wires to the terminal to notify that the Ethernet equipment is not capable of meeting the power requirements, wherein the first signal comprises a difference between bias voltages applied to the first and second pairs of wires, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A terminal capable of being coupled to a network over a line comprising first and second pairs of wires and receiving power via the first and second pairs of wires, the terminal comprising:
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a center tap transformer comprising a first transformer and a second transformer, the first and second transformers capable of being coupled to the first and second pairs of wires, respectively, of the line;
an electrical signature coupled between center taps of the first and second transformers, the electrical signature specifying a power class of the terminal, which can be determined by Ethernet equipment via the first and second pairs of wires; and
a first detector capable of detecting a signal transmitted via the first and second pairs of wires, said signal notifying the terminal of an inability to be remotely powered. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. Ethernet equipment capable of being coupled to a network over a line comprising first and second pairs of wires to a second Ethernet equipment, the Ethernet equipment comprising:
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a center top transformer comprising first and second transformers, said first and second transformers capable of being coupled via the first and second pairs of wires, respectively, to a center tap transformer of the second Ethernet equipment;
an electrical circuit coupled to center taps of the first and second transformers, the electrical circuit being capable of sending a first signal to the second Ethernet equipment via the first and second pairs of wires to determine power requirements of the second Ethernet equipment; and
means coupled to the electrical circuit capable of sending a second signal via the first and second pairs of wires to notify the second Ethernet equipment of the inability to be remotely powered, the second signal being sent when the Ethernet equipment is not capable of meeting the power requirements of the second Ethernet equipment. - View Dependent Claims (19, 20)
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Specification