DC power port in a rack

1. A system, comprising:

a rack;

a direct current (DC) power supply mounted in said rack; and

a DC power port is mounted on an outer surface of said rack and receiving DC power from said DC power supply;

wherein said DC power port is adapted to provide DC power to an electrical device external to said rack.

2. The system of claim 1 wherein the DC power port comprises an automobile cigarette lighter receptacle.

3. The system of claim 1 wherein the DC power port comprises an aircraft in-seat power receptacle.

4. The system of claim 1 further comprising a device supported in said rack, said device selected from a group consisting of a computer, a storage drive, and a network interface.

5. The system of claim 1 further comprising an alternating current (AC) power distribution unit mounted in said rack and providing AC power to said DC power supply.

6. The system of claim 5 wherein the DC power supply is located within said AC power distribution unit.

7. The system of claim 1 further comprising a support member on which said electrical device rests.

8. The system of claim 7 wherein said support member comprises a slidable tray.

9. The system of claim 7 wherein said power port is located at said support member.

10. The system of claim 9 wherein said power port is located on said support member.

11. An system, comprising:

a rack comprising a plurality of slots into which equipment can be installed, wherein said slots are adapted to accept a device selected from a group consisting of a computer, a storage device, and a network interface, and

at least one of said slots accepts a module that includes a direct current (DC) power port and a power supply that converts alternating current (AC) power to DC power;

wherein said DC power port receives said DC power from said power supply; and

wherein said DC power port is accessible from outside of said rack via said slot in which said DC power port is included, and wherein said DC power port can be used to provide DC power to electrical equipment external to said rack.

12. The system of claim 11 wherein the DC power port comprises an automobile cigarette lighter receptacle.

13. The system of claim 11 wherein the DC power port comprises an aircraft in-seat power receptacle.

14. The system of claim 11 further comprising equipment external to said rack, said equipment receives DC power via an electrical cable between said external equipment and said DC power port.

15. The system of claim 14 further comprising a tray on which said external electrical equipment can be placed, wherein said DC power port is mounted at said tray.

16. The system of claim 15 wherein the DC power port is mounted on said tray.

17. A computer, comprising:

host logic;

a power supply that receives alternating current (AC) power and converts said AC power to DC power usable to operate the host logic; and

a DC power port on an exterior surface of said computer, said DC power port receiving DC power from said power supply;

wherein said computer is adapted to be mounted in a rack; and

wherein said DC power port is usable to provide DC power to a device external to said rack, but not usable to provide data to said device.

18. The computer of claim 17 wherein the DC power port comprises an automobile cigarette lighter receptacle.

19. The computer of claim 17 wherein the DC power port comprises an aircraft in-seat power receptacle.