Method and apparatus for distributing power over communication cabling
A PoE powered device and method of operation are provided. The device includes a first port unit configured to negotiate receipt of a level of PoE power from a power sourcing equipment. The power is received on a first pair of taps on a first communication port. A detection unit is configured to detect a presence of a first optional circuit load and to detect a presence of a second optional power load. A control circuit is configured to establish connectivity between a second pair of taps on the first communication port and a second powered device port unit in response to the detection unit detecting the first optional load, and further configured to establish connectivity between the second pair of taps and a third pair of taps on a pass-through communication port in response to the detection unit failing to detect the first load and detecting the second load.
1. A powered telecommunications device, comprising:
a powered device port unit configured to negotiate receipt of a level of power from power sourcing equipment, the power being received from power sourcing equipment on multiple pairs of taps;
a base power load coupled with the powered device port unit and configured to receive power therefrom from at least one pair of the multiple pairs of taps;
a detection unit configured to detect the presence of an optional power load coupled with the device in addition to the base load;
the device configured to establish connectivity between another pair of taps and the optional power load in response to the detection of the presence of the optional power load by the detection unit; and
wherein the device is configured as a remote antenna unit of a distributed antenna system.
2. The device of claim 1 , wherein the optional power load is part of the device along with the base power load, the powered device port unit configured to negotiate receipt of a level of power for the at least one pair of taps for the base power load and for the another pair of taps for the optional load.
3. The device of claim 1 , wherein the optional power load is remote to the device and coupled to the device through a port, the device further configured to establish connectivity between the another pair of taps and taps that are associated with the port.
4. The device of claim 3 , wherein the optional power load is part of another external device including a powered device port unit configured to negotiate receipt of a level of power for the optional power load from power sourcing equipment through the another pair of taps.
5. The device of claim 1 , further comprising a control circuit configured to establish connectivity between the another pair of taps and the optional power load in response to the detection of the optional power load.
6. The device of claim 5 , wherein the detection unit is configured to detect the presence of multiple optional power loads, the control circuit configured to establish connectivity between the another pair of taps and a selected one of the multiple optional power loads in a particular order.
7. The device of claim 6 , wherein the control circuit is configured to establish connectivity with a selected one of the multiple optional power loads based on detecting one of the multiple optional power loads but not detecting another of the multiple optional power loads.
8. The device of claim 1 , wherein the power from the power sourcing equipment is Power over Ethernet power.
9. The device of claim 1 , wherein at least one of the multiple pairs of taps are Power over Ethernet taps.
10. The device of claim 1 , wherein the powered device port unit is a combined powered device port unit, the base power load and optional power load connected with the combined powered device port unit for receiving power therefrom.
11. The device of claim 1 , wherein device is further configured to establish connectivity between the another pair of taps and taps that are associated with a pass-through communication port.
12. The device of claim 1 , wherein the powered device port unit comprises:
a first powered device powered pair unit configured to negotiate a first level of power with power sourcing equipment;
a second powered device powered pair unit configured to negotiate a second level of power with power sourcing equipment;
a first intermediate power module configured to convert the negotiated first level of power to an intermediate voltage level;
a second intermediate power module configured to convert the negotiated second level of power to the intermediate voltage level;
a power combining module configured to combine power at the intermediate voltage level received from the first intermediate power module and received from the second intermediate power module; and
a power conversion and distribution module configured to convert power at the intermediate voltage level received from the power combining module to a source voltage level prior to distributing to a power load.
13. The device of claim 1 , wherein the powered device port unit comprises:
a first powered device powered pair unit configured to negotiate a first level of power with power sourcing equipment,
a second powered device powered pair unit configured to negotiate a second level of power with the power sourcing equipment;
a power combining module configured to combine power received from the first powered device powered pair unit and received from the second powered device powered pair unit;
an intermediate power module configured to convert combined power received from the power combining module to an intermediate voltage level; and
a power conversion and distribution module configured to convert power at the intermediate voltage level received from the intermediate power module to a source voltage level prior to distributing to a power load.
14. The device of claim 1 , wherein the optional power load is a remote antenna unit RF signal processing board.
15. The device of claim 1 , wherein the optional power load is selected from a group consisting of: a standard access point, a WiFi access point, a WiMax access point, a maintenance terminal, an IP camera, and combinations thereof.
16. A method of distributing power in a remote antenna unit of a distributed antenna system, the method comprising:
receiving power on multiple pairs of taps at a powered device port unit of the remote antenna unit of the distributed antenna system;
directing power to a base power load through at least one pair of taps of the multiple pairs of taps;
performing a detection process to detect a presence of an optional power load coupled with the device;
in response to the detection of the presence of the optional power load, establishing connectivity between another pair of taps and the optional power load.
17. The method of claim 16 , wherein the optional power load is part of the device along with the base power load, the method further comprising using the powered device port unit for negotiating receipt of a level of power for the at least one pair of taps for the base power load and for the another pair of taps for the optional load.
18. The method of claim 16 , wherein the optional power load is remote to the device and coupled to the device through a port, the method further comprising establishing connectivity between the another pair of taps and taps that are associated with the port.
19. The method of claim 16 , further comprising detecting the presence of multiple optional power loads and for establishing connectivity between the another pair of taps and a selected one of the multiple optional power loads.