Network apparatus and method to provide compressed digital video over mini-fiber nodes

• US 5,959,658 A
• Filed: 11/12/1996
• Issued: 09/28/1999
• Est. Priority Date: 11/12/1996
• Status: Expired due to Term

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Gnauck, Alan H., Lu, Xiaolin, Woodward, Sheryl Leigh, Reichmann, Kenneth C.
• Primary Examiner(s): Kostak, Victor R.
• Application Number:
  US08/747,708
• Time in Patent Office: 1,050 Days
• Field of Search: 348/6, 348/10, 348/12, 455/3.1, 455/4.2, 455/5.1, 455/6.1
• US Class Current: 725/151
• CPC Class Codes: H04N 7/17309 Transmission or handling of upstream communications
• CPC Class Codes: H04N 7/22 Adaptations for optical transmission

Abstract

A communication network and method is provided to communicate between a central office/head end and a plurality of end-units (EUs). A first transmission medium is connected between the central office and an intermediate node. A plurality of second transmission mediums are connected between the central office and a plurality of mini-fiber nodes. The intermediate node is also associated with each of the mini-fiber nodes such that an analog broadcast service may be sent over the first transmission medium to each of the mini-fiber nodes. Further, switched digital services and digital broadcast services are also sent over the second transmission mediums to each of the mini-fiber nodes. The mini-fiber nodes combine the signals and send the combined signals to a corresponding subset of EUs.

Claims

1. A communications network, comprising:

a central office;

a plurality of intermediate nodes;

a plurality of end-units, each of the plurality of end-units associated with at least one of the plurality of intermediate nodes;

at least one first transmission medium carrying a broadcast signal and an allocated signal which connects the central office to a subset of the plurality of intermediate nodes,

a plurality of second transmission mediums each connecting at least one of the plurality of intermediate nodes to a subset of the plurality of end-units; and

at least one third transmission medium connecting the central office to the plurality of intermediate nodes,

wherein the at least one third transmission medium carries a first signal to the plurality of intermediate nodes, the at least one first transmission medium carries a second signal to at least one of the plurality of intermediate nodes and the plurality of second transmission mediums carries signals from the plurality of intermediate nodes to at least one of the plurality of end units, wherein the second signal uses a different frequency band than the first signal and the first signal and the second signal are combined at the plurality of intermediate nodes and wherein the second signal includes an allocated signal that is transmitted to at least one of the plurality of end units; and

wherein the at least one first transmission medium carries a broadcast signal to at least one of the plurality of intermediate nodes.

2. The communications network of claim 1, wherein the at least one third transmission medium includes a fiber node, an optical fiber connecting the central office and the fiber node and a plurality of communication lines each connecting the fiber node with at least one of the plurality of intermediate nodes.

3. The communications network of claim 1, wherein the first signal is an analog video signal.

4. The communications network of claim 1, wherein the second signal includes at least a digital video signal.

5. The communications network of claim 1, wherein the allocated signal is an encoded signal such that only the specified end-unit can receive and decode the allocated signal.

6. The communications network of claim 1, wherein the allocated signal is a coded signal for decoding by only the specified end-unit.

7. The communications network of claim 1, wherein the central office includes a power control device for controlling the power per Hertz of the second signal transmitted along each of the plurality of first transmission mediums.

8. The communications network of claim 1, wherein the power control device controls the power per Hertz of the second signal based on a required bit-error-rate performance of the signal at the end-units.

9. The communications network of claim 1, wherein the central office includes one transmitter for transmitting the second signal from the central office along one of the plurality of first transmission mediums to an intermediate node for physical connection to a subset of the plurality of end-units.

10. The communications network of claim 1, wherein each of the plurality of first transmission mediums includes an optical fiber.

11. The communications network of claim 1, wherein the central office includes a switching device that controls the broadcast signal that is transmitted over the at least one first transmission medium.

12. The communications network of claim 1, wherein the central office includes a switching device that controls which of the at least one first transmission medium carries the second signal.

13. The communications network of claim 1, wherein the allocated signal provides a switched service.

14. A communications network comprising:

a first transmission medium connected to a central office, the central office transmitting a first broadcast service over the first transmission medium;

a plurality of second transmission mediums separate from the first transmission medium, the central office transmitting a second broadcast service over the plurality of second transmission mediums;

a plurality of intermediate nodes, each one of the plurality of intermediate nodes connected to a separate one of the plurality of second transmission mediums to receive the second broadcast service and connected to receive the first broadcast service, each of the intermediate nodes combining the first broadcast service and the second broadcast service; and

a plurality of passive transmission mediums each for connecting one of the intermediate nodes to a corresponding subset of a plurality of end-units, wherein the plurality of intermediate nodes send the combined first broadcast service and second broadcast service along the plurality of passive transmission mediums for receipt by each of the plurality of end-units.

15. The communications network of claim 14, wherein the central office includes an allocating device for transmitting an allocated signal along one of the plurality of second transmission mediums to an associated one of the plurality of intermediate nodes, the allocated signal being further sent along one of the passive transmission mediums to a specified end-unit.

16. The communications network of claim 15, wherein the allocated signal is a frequency division multiplexed signal for transmission to the specified end-unit.

17. The communications network of claim 15, wherein the central office includes a power control device for controlling power per Hertz of the second broadcast service.

18. The communications network of claim 15, wherein the central office includes a power control device for controlling power per Hertz of the allocated signal.

19. The communications network of claim 15, wherein the central office includes a channel allocation device for controlling which broadcast is transmitted as the second broadcast service.

20. A data transmission system comprising:

a central office;

a transmission medium for connecting the central office to a plurality of end-units, the central office transmitting a plurality of digital services along the transmission medium; and

a power control device for controlling digital service signals on analog subcarriers of the transmission medium based on a power per channel determined by bit-error-rate performance requirements of the digital services provided.

21. The data transmission system of claim 20, wherein the digital services include a broadcast service and at least one allocated service.

22. The data transmission system of claim 20, wherein the digital services are transmitted using at least one type of modulation format and at least one type of error correction encoding.

23. A method of transmitting signals from a central office to an end-unit of a plurality of end-units, the method comprising:

transmitting a first broadcast signal along a first transmission medium from the central office to an intermediate node;

transmitting a second broadcast signal along a second transmission medium to the intermediate node;

transmitting a third signal along the first transmission medium to the intermediate node;

combining the first and the second broadcast signals and the third signal into a combined signal at the intermediate node; and

transmitting the combined signal to the end-unit.

24. The method of claim 23, wherein the third signal is an encoded signal specific to the end-unit.

25. The method of claim 23, further comprising controlling power per Hertz of the first broadcast signal and the third signal based on requirements of the combined signal provided to the end-unit.

26. The method of claim 23, wherein the first broadcast signal is a digital video signal.

27. The method of claim 23, further comprising controlling the first broadcast signal based on a broadcast preference of the end-unit.

28. The method of claim 23, wherein the first transmission medium is an optical medium and the second transmission medium includes a node, the method further comprising:

receiving the second broadcast signal via the second transmission medium at the node; and

transmitting a fourth broadcast signal to the intermediate node via a third transmission medium, the fourth broadcast signal containing a same information as that of the second broadcast signal.

29. The method of claim 23, wherein the third signal is a switched signal, the first broadcast signal is a digital signal and the second broadcast signal is an analog signal.

30. The method of claim 23, wherein the third signal is a switched signal, the first broadcast signal includes a digital video signal and the second broadcast signal includes an analog video signal.

31. A method of communicating between a central office and a plurality of end-units, the method comprising:

transmitting a first broadcast service from the central office over a first transmission medium;

transmitting a second broadcast service from the central office over a plurality of second transmission mediums;

receiving and combining the first broadcast service and the second broadcast service at a plurality of intermediate nodes; and

sending the combined first broadcast service and second broadcast service from the plurality of intermediate nodes along a third transmission medium for connection to a corresponding plurality of end-units.

32. The method of claim 31, further comprising transmitting an allocated signal from the central office along one of the plurality of second transmission mediums to one of the plurality of intermediate nodes for connection to a specified end-unit.

33. A method of transmitting signals from a central office to a plurality of end-units, the method comprising:

transmitting a first broadcast signal along a plurality of first transmission mediums from the central office to a plurality of intermediate nodes, each first transmission mediums corresponding to one of the intermediate nodes;

transmitting a second broadcast signal along a plurality of second transmission mediums to the intermediate nodes;

transmitting third signals along the first transmission mediums to the intermediate nodes, each of the third signals being associated with one end-unit of the end-units and transmitted to one of the intermediate nodes connected to the one end-unit;

combining the first and the second broadcast signals and the third signals into combined signals at respective ones of the intermediate nodes; and

transmitting each of the combined signals to one of the end-units.