System and method for establishing a point-to-multipoint DSL network

• US 6,678,721 B1
• Filed: 07/21/1999
• Issued: 01/13/2004
• Est. Priority Date: 11/18/1998
• Status: Expired due to Fees

• Current Assignee: Conexant Incorporated (Synaptics Incorporated)
• Original Assignee: GlobespanVirata, Inc. (Synaptics Incorporated)
• Inventors: Bell, Russell W.
• Primary Examiner(s): Jean, Frantz B.
• Assistant Examiner(s): NGUYEN, THU HA T
• Application Number:
  US09/358,192
• Time in Patent Office: 1,637 Days
• Field of Search: 709/709, 709/227, 709/250, 709/208, 709/209, 709/251, 709/252, 395/200.68, 375/222, 370/401, 370/229, 370/352, 710/8
• US Class Current: 709/209
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling

Abstract

The present invention is directed to a system and method for establishing a point to multipoint communication network. Preferable, the point to multipoint communication network is established in the environment of a home of small office, and the invention is realized through a computer that may dynamically establish both LAN and WAN communications. Broadly, the system and method of the present invention are realized by a computer that is configured to assume a role as either a Master or a Slave on a LAN. If the computer is the first (or only) computer powered up on the LAN, then it assumes the role of Master. In this role, the computer establishes a communication link with a WAN (such as with an Internet Service Provider), and directs all WAN communications over the WAN, using a WAN frequency and protocol (such as DSL). As other computers join the LAN, then WAN communications from those computers are relayed through the Master to the WAN. These communications are relayed to the Master using a LAN frequency band. If upon power-up, however, another computer is identified as already being on the LAN (and configured as a Master), then the computer assumes a Slave configuration. In this configuration, all WAN communications are directed to the WAN by way of the Master computer, and are communicated to the Master computer using a LAN frequency band. Return communications, received from the WAN, are received by the Master, and directed to the appropriate Slave computer, using a LAN frequency band.

Claims

1. A method for a computer to establish a digital subscriber line connection with a WAN, from within a LAN, comprising the steps of:

communicating a broadcast message over the LAN, wherein the step of communicating a broadcast message over the LAN includes communicating a message in a frequency band exceeding a highest frequency of the WAN;

awaiting a reply;

assuming a master configuration, if no reply is received within a timeout period; and

assuming a slave configuration, if a reply is received, wherein the reply identifies a computer that is configured as a master.

2. The method of claim 1, wherein the step of assuming a slave configuration includes communicating all signals and messages to the WAN through another computer that is identified as the master.

3. The method of claim 1, wherein the step of assuming a master configuration includes communicating a broadcast message over the LAN includes communicating a message in a frequency band exceeding a highest frequency of the WAN.

4. The method of claim 1, wherein the step of assuming a slave configuration further includes the step of determining if the computer identified as the master discontinues operation.

5. The method of claim 4, further including the step of monitoring the LAN for another computer to communicate a broadcast message to configure itself as a master, and acknowledging that broadcast message, if the broadcast message is received with a predetermined timeout period.

6. The method of claim 5, further including the steps of:

communicating a second broadcast message over the LAN, in response to the identification of the discontinued operation of the master, if no other broadcast message is received from another computer within the predetermined timeout period;

assuming a master configuration, if no reply is received within a timeout period; and

assuming a slave configuration, if a reply is received, wherein the reply identifies a computer that is configured as a master.

7. A communication circuit for equipping a computer to communicate over both a LAN and a WAN comprising:

WAN communication circuitry for generating signals for communication over the WAN in accordance with a predetermined transmission frequency and protocol;

LAN communication circuitry for generating signals for intra-LAN communication, the LAN communication circuitry configured to generate a signal that is transmitted in a frequency band that exceeds the highest transmission frequency of signals communicated over the WAN;

first logic, operable upon a reset condition, configured to determine whether any other computer is presently in communication with the LAN;

second logic configured to establish WAN communications from the computer within a WAN frequency band, if the first logic indicates that no other computer is presently in communication with the LAN; and

third logic configured to direct WAN communications through another computer on the LAN, communicating these communications through the another computer, within a LAN frequency band.

8. The communication circuit of claim 7, wherein the LAN frequency band is higher than the WAN frequency band.

9. The communication circuit of claim 7, wherein the first logic, second logic, and third logic comprise segments of micro-code.

10. The communication circuit of claim 7, wherein the first logic, second logic, and third logic comprise dedicated circuitry.

11. The communication circuit of claim 7, wherein the first logic is further configured to determine whether another computer is presently in communication with the LAN that has already established a communication link over the WAN.

12. The communication circuit of claim 7, wherein the WAN communications use a digital subscriber line (DSL) service.

13. The communication circuit of claim 8, further including fourth logic configured to detect an error condition in communicating WAN communications through an another computer.

14. The communication circuit of claim 7, further including sixth logic configured to receive communications from another computer within the LAN frequency band destined for the WAN, and directing these communications over the WAN, using the WAN frequency band.

15. The communication circuit of claim 13, further including fifth logic, responsive to the fourth logic, the fifth logic configured to perform a task selected from the group consisting of:

directing WAN communications directly over the WAN, within the WAN frequency band; and

directing WAN communications through another computer, within the LAN frequency band.

16. A computer configured to communicate over both a LAN and a WAN comprising:

WAN communication circuitry for generating signals for communication over the WAN in accordance with a predetermined transmission frequency and protocol;

LAN communication circuitry for generating signals for intra-LAN communication, the LAN communication circuitry configured to generate a signal that is transmitted in a frequency band that exceeds the highest transmission frequency of signals communicated over the WAN;

first logic, operable upon a reset condition, configured to determine whether any other computer is presently in communication with the LAN;

second logic configured to establish WAN communications from the computer within a WAN frequency band, if the first logic indicates that no other computer is presently in communication with the LAN; and

third logic configured to direct WAN communications through another computer on the LAN, communicating these communications through the another computer, within a LAN frequency band.

17. A computer configured to communicate over both a LAN and a WAN comprising:

WAN communication circuitry for generating signals for communication over the WAN in accordance with a predetermined transmission frequency and protocol;

LAN communication circuitry for generating signals for intra-LAN communication, the LAN communication circuitry configured to generate a signal that is transmitted in a frequency band that exceeds the highest transmission frequency of signals communicated over the WAN;

detection circuitry for detecting whether another at least one other computer is communicating with the LAN;

master circuitry, responsive to the detection circuitry, for configuring the computer as a Master computer on the LAN, if no other computers are initially in communication with the LAN; and

slave circuitry, responsive to the detection circuitry, for configuring the computer as a Slave computer on the LAN, if at least one other computer is detected as being in communication with the LAN.

18. The computer of claim 17, further including logic to direct WAN communications over the WAN, using the WAN communication circuitry, if the computer is configured as a Master.

19. The computer of claim 17, further including logic to direct WAN communications over the LAN, using the LAN communication circuitry, if the computer is configured as a Slave, whereby the WAN communications are communicated over the WAN by another computer that has been configured as a MASTER.

20. A communication circuit for configuring a computer to communicate over both a LAN and a WAN comprising:

WAN communication circuitry for generating signals for communication over the WAN in accordance with a predetermined transmission frequency and protocol;

LAN communication circuitry for generating signals for intra-LAN communication, the LAN communication circuitry configured to generate a signal that is transmitted in a frequency band that exceeds the highest transmission frequency of signals communicated over the WAN;

detection circuitry for detecting whether another at least one other computer is communicating with the LAN;

master circuitry, responsive to the detection circuitry, for configuring the computer as a Master computer on the LAN, if no other computers are initially in communication with the LAN; and

slave circuitry, responsive to the detection circuitry, for configuring the computer as a Slave computer on the LAN, if at least one other computer is detected as being in communication with the LAN.