Home area network system and method

• US 6,069,899 A
• Filed: 08/28/1997
• Issued: 05/30/2000
• Est. Priority Date: 08/28/1997
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.), Travertine Systems, Inc.
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Foley, Peter F.
• Primary Examiner(s): Vu, Huy D.
• Assistant Examiner(s): PHAN, MAN U
• Application Number:
  US08/924,449
• Time in Patent Office: 1,006 Days
• Field of Search: 370/85, 370/94, 370/69, 370/445, 370/79, 370/60, 370/281, 370/486, 370/110, 370/124, 370/76, 370/395, 370/401, 379/93.07, 379/93.14, 379/53, 379/93.08, 379/90.01, 375/18, 375/86, 375/52, 375/56, 375/54, 375/42
• US Class Current: 370/494
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data
• CPC Class Codes: H04N 7/106 for domestic distribution
• CPC Class Codes: H04N 7/108 the cable being constituted by a pair of wires

Abstract

A home area network system and method uses existing plain old telephone system (POTS) wiring to network computers in a home without disrupting conventional telephone services. The home area network assigns a network address to each computer coupled to the network and communicates using a broadband communication method occupying the portion of the spectrum above the baseband portion used by ordinary telephone service. The home area network employs quadrature phase shift keying (QPSK) modulation on unshielded twisted pair (UTP) wiring arranged in an arbitrary topology. The home area network additionally employs adaptive equalization for each computer pair coupling as well as adaptive error correction.

Claims

1. A local area computer network for networking a plurality of network clients at a customer premises, the network clients communicating using analog bandpass signals, comprising:

an infrastructure of unshielded twisted pair (UTP) wiring at the customer premises, the UTP wiring disposed to send and receive plain old telephone service (POTS) signals;

at plurality of network clients coupled to the UTP wiring;

at least one network client having a network interface transmitter module including;

a signal modulator having signal processing modules configured to convert a digital bit stream into a modulated digital bandpass signal at an output of the signal modulator;

analog interface circuitry including a digital to analog converter coupled to the signal modulator output, the analog interface circuitry configured to convert the modulated digital bandpass signal to an analog bandpass signal coupled to the customer premises wiring; and

at least one network client having a network interface receiver including;

analog interface circuitry having an input coupled to the customer premises wiring, the analog interface circuitry including an analog to digital converter having an output; and

a bandpass signal demodulator coupled to the output of the analog to digital converter, the bandpass demodulator having signal processing modules configured to convert digitized bandpass signals to baseband digital bit streams suitable for processing by the network client.

2. The system of claim 1 further comprising:

at least one POTS compatible device coupled to the customer premises wiring; and

a wide area network interface coupled to the customer premises wiring, the wide area network delivering POTS services to the customer premises wiring.

3. The system of claim 2 wherein the wide area network is the public switched telephone network (PSTN).

4. The system of claim 2 wherein the wide area network is a coupling to a subscriber loop.

5. The system of claim 2 wherein the wide area network interface is a coupling to a coaxial cable transmission medium.

6. The system of claim 2 wherein the wide area network interface is a coupling to a wireless transmission medium.

11. The system of claim 1 wherein the bandpass demodulator is a quadrature phase shift keyed (QPSK) demodulator.

12. The system of claim 1 wherein the bandpass demodulator is a quadrature amplitude modulation (QAM) demodulator.

13. The system of claim 1 wherein a network client having a transmitting network interface module further comprises:

a digital video interface configured to receive a digital video bit stream from a video source, the digital interface coupled to the transmitting network interface module to deliver the received digital video bit stream to a network client having a receiving network interface module.

14. The system of claim 13 wherein the video source is a digital satellite service.

15. The system of claim 13 wherein the video source is a coaxial cable-based source.

7. The system of 2 further comprising a passive filter coupled to the POTS compatible device, the lowpass filter having a stopband including at least the portion of the spectrum occupied by the analog bandpass signals.

8. The system of claim 7 wherein the filter is a passive diplexer filter having an impedance matching the impedance of the UTP wiring for a frequency range corresponding to the bandpass signals.

9. The system of claim 8 further comprising a passive filter at the wide area network interface, the filter having a stopband including at least the portion of the spectrum occupied by the analog bandpass signals.

10. The system of claim 9 wherein the filter is a passive diplexer filter having an impedance matching the impedance of the UTP wiring for a frequency range corresponding to the bandpass signals.