Power saving device

1. A power saving device disposed in use between a digital television set top box and a mains power supply for supplying power to said set top box, said power saving device comprising:

a communications channel input connected in operation to a communications channel output of said set top box, wherein said communications channel input is operable to receive control instructions from said set top box in response to a request from a user of said set top box to place said set top box into a standby mode;

a switch for fully powering down said set top box by disconnecting said set top box from said mains power supply in response to said control instructions received from said set top box;

a signal receiver operable to receive signals from an external third party, said signals initiating the reconnection of said set top box to said mains power supply and the powering up of said set top box; and

an internal power source operable to provide power to said power saving device.

2. The power saving device of claim 1 , wherein said external third party comprises a television broadcaster, and said signals initiating the reconnection of said set top box to said mains power supply and the powering up of said set top box comprise signals indicating that new entitlement data is about to be delivered or that a new recording event is to be added to a recording schedule of said set top box.

3. The power saving device of claim 1 , wherein said signals comprise Ethernet signals.

4. The power saving device of claim 1 , wherein said signals comprise PSTN signals.

5. The power saving device of claim 1 , wherein said signals comprise RF signals.

6. The power saving device of claim 5 , wherein said RF signals initiating the reconnection of said set top box are modulated with standard RF signals being transmitted to said set top box.

7. The power saving device of claim 5 , wherein said RF signals initiating the reconnection of said set top box are overlaid on standard RF signals being transmitted to said set top box.

8. The power saving device of claim 7 , wherein said RF signals are transmitted out of band to said standard RF signals.

9. The power saving device of claim 1 , wherein said internal power source comprises a battery.

10. The power saving device of claim 1 , wherein said internal power source comprises a rechargeable power source.

11. The power saving device of claim 10 , wherein said power saving device reconnects said set top box to said mains power supply in order to recharge said rechargeable power source.

12. The power saving device of claim 10 , wherein said rechargeable power source comprises a rechargeable battery.

13. The power saving device of claim 10 , wherein said rechargeable power source comprises a capacitor.

14. The power saving device of claim 1 , wherein said internal power source comprises a mains transformer.

15. The power saving device of claim 1 , further comprising a timer, and wherein said control instructions include a time measurable using said timer, at which time said set top box is to be reconnected to said mains power supply.

16. The power saving device of claim 1 , wherein said communications channel input comprises a serial communications channel input.

17. The power saving device of claim 16 , wherein said communications channel input comprises an RS-232 input.

18. The power saving device of claim 16 , wherein said communications channel input comprises a universal serial bus input.

19. An apparatus for power saving disposed in use between a digital television set top box and a mains power supply for supplying power to said set top box, said power saving device comprising:

communications channel input means connected in operation to communications channel output means of said set top box, wherein said communications channel input means are for receiving control instructions from said set top box in response to a request from a user of said set top box to place said set top box into a standby mode;

switching means for fully powering down said set top box by disconnecting said set top box from said mains power supply in response to said control instructions received from said set top box;

signal receiving means for receiving signals from an external third party, said signals initiating the reconnection of said set top box to said mains power supply and the powering up of said set top box; and

internal power means for powering said power saving device.

20. The apparatus of claim 19 , wherein said external third party comprises a television broadcaster, and said signals initiating the reconnection of said set top box to said mains power supply and the powering up of said set top box comprise signals indicating that new entitlement data is about to be delivered or that a new recording event is to be added to a recording schedule of said set top box.

21. A method of operating a power saving device, said power saving device being disposed in use between a digital television set top box and a mains power supply for supplying power to said set top box, said method comprising the steps of:

receiving control instructions from said set top box in response to a request from a user of said set top box to place said set top box into a standby mode;

responsive to said control instructions, fully powering down said set top box by disconnecting said set top box from said mains power supply;

receiving signals from an external third party; and

responsive to said signals, initiating the reconnection of said set top box to said mains power supply and the powering up of said set top box.