Proxy addressing scheme for cable networks

• US 8,627,392 B1
• Filed: 11/30/2007
• Issued: 01/07/2014
• Est. Priority Date: 03/27/2002
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Chapman, John T.
• Primary Examiner(s): Goodarzi, Nasser
• Assistant Examiner(s): Kay, Mary A
• Application Number:
  US11/948,895
• Time in Patent Office: 2,230 Days
• Field of Search: None
• US Class Current: 725/111
• CPC Class Codes: H04L 12/2801 Broadband local area networks
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling
• CPC Class Codes: H04L 61/103 across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]

Abstract

A proxy in a cable modem termination system receives IP packets having an address associated with set top box out of band messages. The proxy encapsulates the packets in an Ethernet frame containing an Ethernet address. A cable modem associated with the set top box is preconfigured to detect the Ethernet encapsulated packets and pass the out of band messages in the packets to the set top box.

Claims

1. A method for transferring data in a cable network, comprising:

receiving both set top box Out Of Band (OOB) message packets and Data Over Cable Service Interface Specifications (DOCSIS) IP packets over a same channel with a same DOCSIS interface;

sending the set top box OOB message packets from the DOCSIS interface downstream to a set top box client; and

sending the DOCSIS IP packets from the DOCSIS interface upstream to at least one other IP endpoint in an IP network associated with the destination address in the IP packet.

2. The method according to claim 1

wherein the set top box OOB message packets include a layer two address.

3. The method according to claim 1

wherein the set top box OOB message packets include a well-known Ethernet address and a DOCSIS IP address.

4. The method according to claim 3 further comprising:

searching the packets received by the DOCSIS interface for the well-known Ethernet address;

identifying the packets that include the well-known Ethernet address as the set top box OOB message packets; and

identifying the packets that do not include the well-known Ethernet address as the DOCSIS IP packets.

6. The method according to claim 1 including:

receiving both the set top box OOB message packets and the DOCSIS IP packets over a same downstream channel of a hybrid fiber coax.

7. The method according to claim 1 including:

receiving set top box user inputs with a set top box client;

sending the set top box user inputs to the DOCSIS interface;

receiving IP packets from an IP endpoint in the IP network at the DOCSIS interface;

sending both the set top box user inputs and the IP packets from the DOCSIS interface over a same upstream channel of a hybrid fiber coax.

5. The method according to 1 further comprising:

receiving set top box OOB message packets having different well known Ethernet addresses and sending data in the set top box OOB message packets to different set top box clients associated with the different well-known Ethernet addresses.

8. An apparatus, comprising:

a cable modem circuit comprising;

a tuner configured to receive Out Of Band (OOB) set top box packets and Data Over Cable Service Interface Specifications (DOCSIS) IP packets over a same downstream DOCSIS channel; and

a DOCSIS interface configured to send data in OOB set top box packets downstream to a set top box client and send data in DOCSIS IP packets upstream to an IP client in an IP network.

9. The apparatus according to claim 8

wherein the DOCSIS interface is configured to distinguish packets with a predefined Ethernet address as the OOB set top box packets and distinguish packets that do not have the predefined Ethernet address as the DOCSIS IP packets.

10. The apparatus according to claim 8

wherein the DOCSIS interface is configured to output data from both the set top box client and IP packets from an IP endpoint in the IP network over a same upstream channel of a hybrid fiber coax.

11. The apparatus according to claim 8 including different set top box clients,

wherein the cable modem circuit is configured to send set top box messages to the different set top box clients according to different predetermined Ethernet addresses.

12. The apparatus according to claim 11

wherein the cable modem circuit is configured to send the set top box messages to the different set top box clients according to different IP addresses or port numbers associated with the predetermined Ethernet addresses.

13. The apparatus according to claim 8

wherein the tuner is a DOCSIS tuner.

14. A circuit, comprising:

a Data Over Cable Service Interface Specifications (DOCSIS) tuner configured to receive both Out Of Band (OOB) set top box messages and DOCSIS IP packets over a same downstream DOCSIS channel;

a DOCSIS interface module configured to receive an output of the DOCSIS tuner,

output the OOB set top box messages to a set top box client, and output the DOCSIS IP packets to an IP network interface.

15. The circuit according to claim 14

wherein the set top box client only receives the OOB set top box messages from the DOCSIS interface module tuner.

16. The circuit according to claim 14

wherein the DOCSIS interface module is configured to also receive OOB set top box upstream messages from the set top box client.

17. The circuit according to claim 16 further comprising

a DOCSIS transmitter configured to output both the OOB set top box upstream messages and DOCSIS upstream packets from the DOCSIS interface module over a same upstream cable channel.

18. The circuit according to claim 14 further comprising:

a diplexer configured to connect to a hybrid fiber coaxial cable and connect to the DOCSIS tuner;

a video tuner coupled to the diplexer;

a DOCSIS transmitter coupled to the diplexer; and

a video converter coupled to the video tuner and the set top box client and configured to receive the OOB set top box messages from the set top box client.