Physical layer device auto-adjustment based on power over Ethernet magnetic heating
View Patent ↗Physical layer device auto-adjustment based on power over Ethernet (PoE) magnetic heating. In one embodiment, information generated by a PoE module that is indicative of the PoE operation over the network cable (e.g., level of current, heating, etc.) is made available to the physical layer device (PHY). This information enables the PHY to infer a change in the level of inductance on the line. In response, the PHY can then adjust a characteristic of transmission by the PHY.
1. A method, comprising:
receiving, in a physical layer device, information that is indicative of a level of heating of a data transformer that couples said physical layer device to a twisted wire pair, wherein a center tap of said data transformer is coupled to a power over Ethernet module that facilitates a delivery of power over said twisted wire pair; and
adjusting a characteristic of transmission by said physical layer device in response to said information that is indicative of a level of heating of said data transformer.
2. The method of claim 1 , further comprising determining a change in inductance of a data transformer based on said information that is indicative of a level of heating of a data transformer.
3. The method of claim 1 , wherein said information that is indicative of a level of heating of a data transformer is a temperature sensor reading.
4. The method of claim 1 , wherein said information that is indicative of a level of heating of a data transformer is a level of current that passes through said data transformer.
5. The method of claim 1 , wherein said adjusting comprises adjusting a transmission voltage envelope of said physical layer device.
6. The method of claim 1 , wherein said adjusting comprises adjusting a transmission current envelope of said physical layer device.
7. The method of claim 1 , wherein said adjusting comprises adjusting a waveform output by said physical layer device.
8. The method of claim 1 , wherein said power over Ethernet module is a power source equipment that transmits power over said twisted wire pair.
9. The method of claim 1 , wherein said power over Ethernet module is a powered device that receives power over said twisted wire pair.
10. A method, comprising:
receiving, in a physical layer device, information generated by a power over Ethernet module, the power over Ethernet module controlling a level of current that is transmitted over a plurality of twisted wire pairs that are coupled to the physical layer device via a corresponding plurality of data transformers, the power over Ethernet module coupled to center taps of the plurality of data transformers, wherein the information received by the physical layer device from the power over Ethernet module is indicative of a level of heating of at least one of the plurality of data transformers due to the transmission of the level of current; and
adjusting a characteristic of data transmission by the physical layer device in response to the indication of the level of heating of the at least one of the plurality of data transformers due to the transmission of the level of current.
11. The method of claim 10 , further comprising determining a change in inductance of the at least one of the plurality of data transformers based on the information generated by the power over Ethernet module.
12. The method of claim 10 , wherein the adjusting comprises adjusting a data transmission voltage envelope of the physical layer device.
13. The method of claim 10 , wherein the adjusting comprises adjusting a data transmission current envelope of the physical layer device.
14. The method of claim 10 , wherein the adjusting comprises adjusting a data transmission waveform output by the physical layer device.
15. A physical layer device, comprising:
an interface that enables the physical layer device to receive information generated by a power over Ethernet module, the power over Ethernet module controlling a level of current that is transmitted over a plurality of twisted wire pairs that are coupled to the physical layer device via a corresponding plurality of data transformers, the power over Ethernet module coupled to center taps of the plurality of data transformers, wherein the information received by the physical layer device from the power over Ethernet module is indicative of a level of heating of at least one of the plurality of data transformers due to the transmission of the level of current; and
a controller that adjusts a characteristic of data transmission by the physical layer device in response to the indication of the level of heating of the at least one of the plurality of data transformers due to the transmission of the level of current.
16. The physical layer device of claim 15 , wherein the controller adjusts a data transmission voltage envelope of said physical layer device.
17. The physical layer device of claim 15 , wherein the controller adjusts a data transmission current envelope of said physical layer device.
18. The physical layer device of claim 15 , wherein the controller adjusts a data transmission waveform output by said physical layer device.
19. The physical layer device of claim 15 , wherein the controller determines a change in inductance of the at least one of the plurality of data transformers based on the information generated by the power over Ethernet module.