Powered device interface circuit
First Claim
1. A method for communicating multi-bit data from a powered device interface associated with a powered device to power sourcing equipment, the method comprising:
- exhibiting a signature indicative of a powered device to be powered over communication cabling;
sensing a voltage level indicative of remote powering over the communication cabling; and
prior to connecting power to operational circuitry of said powered device, transmitting multi-bit information, responsive to said sensed voltage level, from the powered device interface to the power sourcing equipment over the communication cabling.
3 Assignments
0 Petitions
Accused Products
Abstract
A method for communicating multi-bit data from a powered device being powered over communication cabling to power sourcing equipment, the method comprising: exhibiting a signature indicative of a device to be powered over communication cabling; sensing a voltage level indicative of remote powering over communication cabling; prior to connecting power to operational circuitry, transmitting first multi-bit information; subsequently to the transmitting first multi-bit information, connecting power received over the communication cabling to the operational circuitry; receiving information from the operational circuitry; subsequent to receiving the information disconnecting the received power from the operational circuitry; subsequent to the disconnecting, transmitting second multi-bit information associated with the operational circuitry, the second multi-bit information comprising at least one bit being a function of the received information; and re-connecting power received over the communication cabling to the operational circuitry.
-
Citations
47 Claims
-
1. A method for communicating multi-bit data from a powered device interface associated with a powered device to power sourcing equipment, the method comprising:
-
exhibiting a signature indicative of a powered device to be powered over communication cabling; sensing a voltage level indicative of remote powering over the communication cabling; and prior to connecting power to operational circuitry of said powered device, transmitting multi-bit information, responsive to said sensed voltage level, from the powered device interface to the power sourcing equipment over the communication cabling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of powering a powered device from power sourcing equipment over communication cabling and communicating from an interface of the powered device to the power sourcing equipment, the method comprising:
-
exhibiting a signature indicative of a device to be powered over communication cabling; sensing a voltage level indicative of remote powering over communication cabling; transmitting multi-bit information from the powered device interface to the power sourcing equipment responsive to said sensed voltage level; and subsequently to said transmitting, connecting power received over communication cabling to powered device operational circuitry. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A method for communicating multi-bit data from a powered device being powered over communication cabling to power sourcing equipment, the method comprising:
-
exhibiting a signature indicative of a device to be powered over communication cabling; sensing a voltage level indicative of remote powering over communication cabling; prior to connecting power to operational circuitry of the powered device, transmitting first multi-bit information from the powered device to the power sourcing equipment responsive to said sensed voltage level; subsequently to said transmitting first multi-bit information, connecting power received over the communication cabling to the powered device operational circuitry; receiving information from the powered device operational circuitry; disconnecting said received power from the powered device operational circuitry; and subsequent to said disconnecting, and prior to reconnecting power to said operational circuitry, transmitting second multi-bit information associated with said operational circuitry from the powered device to the power sourcing equipment, said second multi-bit information comprising at least one bit being a function of said received information. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
-
29. A powered device interface circuit comprising:
-
a control circuit; a means for exhibiting a signature impedance to power sourcing equipment connected over a communication cabling, said means for exhibiting being responsive to said control circuit; a voltage sensor in communication with said control circuit; an isolating switch operating means responsive to said control circuit; and a means for transmitting multi-bit information over the communication cabling to the power sourcing equipment, said means for transmitting being responsive to said control circuit, said control circuit being operable to transmit first multi-bit information to the power sourcing equipment over the communication cabling via said means for transmitting responsive to a predetermined voltage level sensed by said voltage sensor prior to operating said isolating switch operating means to close an isolating switch. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
-
-
42. A local area network comprising:
-
a power sourcing equipment; a powered device; and a communication cabling connecting said power sourcing equipment to said powered device; said powered device comprising a powered device interface circuit comprising; (a) a control circuit; (b) a means for exhibiting a signature impedance to said power sourcing equipment, said means for exhibiting responsive to said control circuit to exhibit the signature impedance to said power sourcing equipment over said communication cabling, said power sourcing equipment supplying power to said powered device via said communication cabling responsive to said exhibited signature impedance; and (c) an isolating switch responsive to said control circuit, said control circuit being operable to transmit multi-bit information over said communication cabling to said power sourcing equipment prior to operating said isolating switch connecting said power supplied from said power sourcing equipment via said communication cabling to powered device operational circuitry.
-
-
43. A method for communicating multi-bit data from a powered device being powered over communication cabling to power sourcing equipment, the method comprising:
-
sensing a voltage level indicative of remote powering over communication cabling; prior to connecting power to operational circuitry associated with the powered device, transmitting multi-bit information from the powered device to the power sourcing equipment, said transmitting being responsive to said sensed voltage level.
-
-
44. A method for communicating multi-bit data from a powered device being powered over communication cabling to power sourcing equipment, the method comprising:
-
exhibiting a signature indicative of a device to be powered over communication cabling; sensing a voltage level indicative of remote powering over communication cabling; prior to connecting power to associated operational circuitry, transmitting first multi-bit information from the powered device to the power sourcing equipment responsive to said sensed voltage level; subsequent to said transmitting first multi-bit information, connecting power received over communication cabling to associated operational circuitry; disconnecting said power received over the communication cabling from the associated operational circuitry; and subsequent to said disconnecting, transmitting second multi-bit information indicative of at least one characteristic of the associated operational circuitry from the powered device to the power sourcing equipment.
-
-
45. A method for communicating multi-bit data from a powered device being powered over communication cabling to power sourcing equipment, the method comprising:
-
sensing a voltage level indicative of remote powering over communication cabling; prior to connecting power to associated operational circuitry, transmitting first multi-bit information from the powered device to the power sourcing equipment responsive to said sensed voltage level; subsequent to said transmitting first multi-bit information, connecting power received over the communication cabling to the associated operational circuitry; subsequent to said connecting power, disconnecting said power received over the communication cabling from the associated operational circuitry; and subsequent to said disconnecting, transmitting second multi-bit information indicative of at least one characteristic of the associated operational circuitry from the powered device to the power sourcing equipment, said transmitting exhibiting timing and current levels so as to ensure a valid maintain power signature.
-
-
46. An integrated circuit for use with a powered device comprising:
-
(a) a control circuit; (b) a means for exhibiting a signature impedance, said means for exhibiting responsive to said control circuit; and (c) an isolating switch operating means responsive to said control circuit, said control circuit being operable to transmit multi-bit information over communication cabling to power sourcing equipment prior to operating said isolating switch operating means to connect power received from power sourcing equipment via communication cabling to powered device operational circuitry.
-
-
47. Power sourcing equipment for use with a powered device, said power sourcing equipment comprising a control, a current limited power source and a current sensor, said control being operable to:
-
detect a powered device; apply a current limited power from said current limited power source to the detected powered device; and to detect during a pre-determined time period after the application of said current limited power, via said current sensor, multi-bit information transmitted from the powered device to the power sourcing equipment during said pre-determined time period.
-
Specification