Automated ethernet configuration of CATV network

• US 7,519,078 B2
• Filed: 05/12/2004
• Issued: 04/14/2009
• Est. Priority Date: 05/12/2004
• Status: Active Grant

• Current Assignee: II-VI Delaware, Inc. (Coherent Corp.)
• Original Assignee: Finisar Corporation (II-VI Incorporated)
• Inventors: Oyadomari, Randy Ichiro, Gordy, Stephen Charles, Lawson, Arthur Michael
• Primary Examiner(s): LEE, CHI HO A
• Application Number:
  US10/845,202
• Publication Number:
  US 20050254523A1
• Time in Patent Office: 1,798 Days
• Field of Search: 370/465, 370/487
• US Class Current: 370/465
• CPC Class Codes: H04H 20/78 CATV [Community Antenna Television] systems
• CPC Class Codes: H04L 12/2801 Broadband local area networks
• CPC Class Codes: H04N 21/6118 involving cable transmission, e.g. using a cable modem
• CPC Class Codes: H04N 21/6168 involving cable transmission, e.g. using a cable modem
• CPC Class Codes: H04N 7/17309 Transmission or handling of upstream communications
• CPC Class Codes: H04N 7/22 Adaptations for optical transmission

Abstract

A cable node and a cable hub that communicate on a CATV network are configured to switch compression modes without signal noise or degradation due to excessive delays in switching compression modes. In particular, a cable node sends one or more mute commands in an outgoing data stream to the cable hub, causing the cable hub to disable the RF outputs. Afterward, or along with the one or more mute commands, the cable node can send a switch mode command, thereby causing the cable hub to switch to the appropriate next communication mode, such as a communication mode using a new compression rate. When the cable node and the cable hub have switched to the appropriate next communication mode, the cable hub can then properly receive a corresponding data stream from the cable node using the next communication mode.

Claims

1. In a cable distribution network environment the method, a method comprising the following:

an act of a cable node transmitting mode information to a cable hub over a subscriber to head end return path of a cable distribution network, the mode information at least inferring that the cable node will be transmitting Ethernet data to the cable hub;

an act of the cable node compressing RF data using a compression algorithm to make bandwidth available for the Ethernet data; and

after the act of the cable node transmitting mode information to the cable hub, an act of the cable node combining and transmitting Ethernet data and the compressed RF data to the cable hub.

2. The method as recited in claim 1, further comprising an act of the cable node transmitting one or more subsequent communications to the cable hub, such that the cable hub switches communication modes prior to the act of the cable node transmitting Ethernet data and the compressed RE data to the cable hub.

3. The method as recited in claim 1, wherein the mode information comprises a mute command, the mute command causing the cable hub to disable one or more outputs.

4. The method as recited in claim 3, wherein the mode information comprises a command that causes the cable hub to switch between an RF and Ethernet data communication mode and an RF data communication mode without Ethernet data while the one or more outputs are temporarily disabled by the mute command, wherein the one or more temporarily disabled outputs include outputs designated for the RF data.

5. The method as recited in claim 1, wherein the mode information comprises a command that causes the cable hub to switch from an RF data communication mode to an RF and Ethernet data communication mode.

6. The method as recited in claim 1, wherein the mode information comprises a command that causes the cable hub to switch from an RF and Ethernet data communication mode to an RF data communication mode.

19. The method as recited in claim 1, wherein the act of the cable node compressing RF data includes compressing 10-bit data frames to 9-bit data frames.

20. The method as recited in claim 1, wherein the mode information indicates one of a plurality of cable node modes and one of a plurality of cable hub modes, the plurality of cable hub modes being greater in quantity than the plurality of cable node modes.

7. In a cable distribution network environment the method, a method comprising the following:

an act of a cable hub receiving mode information from a cable node over a subscriber to head end return path of a cable distribution network, the mode information at least inferring that the cable node will be transmitting Ethernet data to the cable hub;

in response to receiving the mode information, an act of configuring the cable hub to receive communications that include both RF data and Ethernet data from the cable node;

an act of receiving Ethernet data and compressed RF data from the cable node, wherein the RF data is compressed using the compression algorithm from the cable node; and

an act of decompressing the RF data using the decompression version of the compression algorithm.

8. The method as recited in claim 7, farther comprising an act of the cable hub receiving one or more subsequent communications after the act of receiving mode information, such that the cable hub switches communication modes prior to receiving Ethernet data and compressed RF data from the cable node.

9. The method as recited in claim 7, wherein the mode information comprises a command that causes the cable hub to switch from an RF data communication mode to an RF and Ethernet data communication mode.

10. The method as recited in claim 7, wherein the mode information comprises a command that causes the cable hub to switch from an RF and Ethernet data communication mode to an RF data communication mode.

11. The method as recited in claim 7, wherein the mode information comprises a mute command, the method further comprising:

in response to receiving the mute command, an act of disabling one or more outputs at the cable hub.

12. The method as recited in claim 11, wherein the mode information comprises a command that causes the cable hub to switch between an RF and Ethernet data communication mode and an RF data communication mode while the one or more outputs are temporarily disabled by the mute command, and resume communication with the cable node using the switched-to communication mode, wherein the temporarily disabled one or more outputs include outputs designated for the RF data.

13. The method as recited in claim 11, wherein the cable node further comprises a node transmission component and a node receiving component;

and wherein the cable hub further comprises a hub receiving component and a hub transmission component.

14. The method as recited in claim 13, further comprising an act of the node receiving component identifying at least one of the presence of the hub receiving component and a data signal from the hub transmission component prior to the act of the cable hub receiving a mute command from the cable node.

15. In a cable distribution network environment that includes an Ethernet-ready cable node having a processing module with computer-executable instructions stored thereon that, when executed, cause the Ethernet-ready cable node to perform a method comprising the following:

an act of transmitting mode information to a cable hub over a subscriber to head end optical return path, the mode information at least inferring that the Ethernet-ready cable node will be transmitting Ethernet data to the cable hub;

an act of compressing RF data using the compression algorithm to make bandwidth available for the Ethernet data;

after the act of transmitting mode information, an act of transmitting Ethernet data and the compressed RF data to the cable hub.

16. The cable node as recited in claim 15, wherein the processing module is a field programmable gate array.

17. In a cable distribution network environment that includes an Ethernet-ready cable hub having a processing module with computer-executable instructions stored thereon that, when executed, cause the Ethernet-ready cable hub to perform a method comprising the following:

an act of a cable hub receiving mode information from the Ethernet-ready cable node over a subscriber to head end optical return path, the mode information at least inferring that the cable node will be transmitting Ethernet data to the cable hub;

in response to receiving the mode information, an act of configuring the cable hub to receive communications that include both RF data and Ethernet data from the Ethernet-ready cable node;

an act of receiving Ethernet data and compressed RF data from the Ethernet-ready cable node, wherein the RF data is compressed using the compression algorithm from the Ethernet-ready cable node; and

an act of decompressing the RF data using the decompression version of the compression algorithm and transmitting the decompressed RF data to a cable modem termination system for demodulation.

18. The cable hub as recited in claim 17, wherein the processing module is a field programmable gate array.