Transmission of pulse power and data over a wire pair
In one embodiment, a method includes applying Forward Error Correction (FEC) to data at power sourcing equipment, transmitting the data and pulse power over a wire pair to a powered device, identifying data transmitted during power transitions between a pulse power on time and a pulse power off time in the pulse power at the powered device, and applying FEC decoding to at least a portion of the data based on said identified power transitions.
1. A method comprising:
applying Forward Error Correction (FEC) to data at a power sourcing equipment;
transmitting the data and power over a wire pair to a powered device;
applying FEC decoding to at least a portion of the data received at the powered device;
determining an error rate based on the FEC decoding;
generating an indication of a power fault on the wire pair based on determining the error rate; and
shutting down the power or adjusting a power setting of the power at the power sourcing equipment based on the indication of the power fault.
2. The method of claim 1 , further comprising transmitting from the powered device to the power sourcing equipment the indication of the power fault on the wire pair based on the error rate.
3. The method of claim 2 , wherein the power is pulse power.
4. The method of claim 1 , further comprising suspending transmission of the data during power transitions at the power sourcing equipment, buffering the data transmitted during said power transitions at the powered device, and decoding FEC encoded data for remaining data.
5. The method of claim 3 , further comprising modulating pulses of the pulse power at the power sourcing equipment for use in transmitting control plane data to the powered device.
6. The method of claim 3 , wherein the pulse power comprises pulse power on time comprising a high power state and pulse power off time comprising a low power state.
7. The method of claim 6 , wherein the data is transmitted during pulse power on times.
8. A powered device comprising:
an interface for receiving power and data from a power sourcing equipment over a wire pair, the data having been Forward Error correction (FEC) encoded prior to transmission; and
a controller coupled to the interface, the controller configured to perform operations including:
applying FEC decoding to at least a portion of data received via the interface;
determining an error rate based on the FEC decoding;
generating an indication of a power fault on the wire pair based on the error rate; and
transmitting to the power sourcing equipment the indication of the power fault on the wire pair based on the error rate.
9. The powered device of claim 8 , wherein the power is pulse power.
10. The powered device of claim 9 , wherein the indication of the power fault is configured to cause the power sourcing equipment to shut down the power or adjusting a power setting of the power at the power sourcing equipment.
11. The powered device of claim 8 , wherein the controller is configured to buffer data transmitted during power transitions and decode FEC encoded data for remaining data.
12. The powered device of claim 9 , wherein pulses of the pulse power is modulated at the power sourcing equipment for transmitting control plane data to the powered device.
13. The powered device of claim 9 , wherein the pulse power comprises a pulse power on time comprising a high power state and pulse power off time comprising a low power state.
14. The powered device of claim 13 , wherein the controller is further configured to perform fault sensing between pulse power on times.
15. The powered device of claim 13 , wherein the data is transmitted during pulse power on times.
16. A system comprising:
power sourcing equipment operable to transmit data and power and to apply Forward Error Correction (FEC) encoding to the data;
a powered device operable to receive the data and the power from the power sourcing equipment over a wire pair; and
a controller at the powered device, the controller configured to perform operations including:
applying FEC decoding to at least a portion of data received;
determining an error rate based on the FEC decoding;
generating an indication of a power fault on the wire pair based on the error rate; and
transmitting to the power sourcing equipment the indication of the power fault on the wire pair based on the error rate.
17. The system of claim 16 , wherein the power is pulse power.
18. The system of claim 16 , wherein the power sourcing equipment is configured to shut down the power or adjust a power setting of the power based on the indication of the power fault.
19. The system of claim 17 , wherein the power sourcing equipment is configured to modulate pulses of the pulse power for transmitting control plane data to the powered device.
20. The system of claim 17 , wherein the pulse power comprises a pulse power on time comprising a high power state and pulse power off time comprising a low power state.