POWERED DEVICE INCLUDING A MULTI-USE DETECTION RESISTOR
First Claim
Patent Images
1. A method comprising:
- receiving a powered device (PD) detection signal at a PD from a powered network;
applying the PD detection signal to an external resistor to provide a detection signature to the powered network;
receiving a PD classification mark signal at the PD;
applying the received PD classification mark signal to the external resistor; and
selectively activating a classification mark current path in parallel with the external resistor to produce a classification mark signature.
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Abstract
In a particular embodiment, a method includes receiving a powered device (PD) detection signal at a PD from a powered network and applying the PD detection signal to an external resistor to provide a detection signature to the powered network. Further, the method includes receiving a PD classification mark signal at the PD, applying the received PD classification mark signal to the external resistor, and selectively activating a classification mark current path in parallel with the external resistor to produce a classification mark signature.
24 Citations
21 Claims
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1. A method comprising:
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receiving a powered device (PD) detection signal at a PD from a powered network; applying the PD detection signal to an external resistor to provide a detection signature to the powered network; receiving a PD classification mark signal at the PD; applying the received PD classification mark signal to the external resistor; and selectively activating a classification mark current path in parallel with the external resistor to produce a classification mark signature. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A Power over Ethernet (PoE) powered device comprising:
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an external resistor including a first terminal and a second terminal; and an integrated circuit comprising; a first pin coupled to the first terminal of the external resistor and coupled to a first power supply terminal; a second pin coupled to the second terminal of the external resistor; a first logic circuit to selectively couple the second pin to a second power supply terminal via a first current path in response to a powered device (PD) detection signal to produce a PD detection signature; and a second logic circuit to selectively couple the second pin to the second power supply terminal via a second current path in response to a PD classification mark signal, the second current path including a current source in parallel with the external resistor to produce a PD classification mark signature. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A circuit device comprising:
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an interface coupled to a cable to receive power and data; a first power supply terminal coupled to the interface; a second power supply terminal coupled to the interface; a first pin coupled to the first power supply terminal and to a first terminal of an external resistor; a second pin coupled to a second terminal of the external resistor; logic circuitry coupled to the interface and adapted to; detect a first signal at the interface; selectively couple the second pin to the second power supply terminal via a first current path in response to detecting the first signal to produce a first current; detect a second signal at the interface; and selectively couple the second pin to the second power supply terminal via a second current path that places a first current source in parallel with the external resistor in response to detecting the second signal to produce a second current. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification