Pulse or digital communications – Multilevel – With threshold level
Reexamination Certificate
1998-09-15
2001-09-18
Pham, Chi (Department: 2631)
Pulse or digital communications
Multilevel
With threshold level
C375S227000
Reexamination Certificate
active
06292517
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to the field of data networking. More specifically, the present invention relates to a method and apparatus for detecting a data signal propagated on a carrier medium.
BACKGROUND OF THE INVENTION
Nodes comprising a data network may transmit and receive information over a guided media, such as metal wire or fiber-optic cable, or an unguided media, such as by infrared or microwave. Copper cable is a relatively inexpensive, well-understood technology that is easily installed and is accordingly the cable of choice in a majority of network installations. However, copper cable suffers from various electrical characteristics that impose transmission limits. Types of copper cable that may be used to transmit digital signals comprise straight cable (i.e., copper wire surrounded by an insulated sheath), twisted-pair cable (i.e., a pair of copper wires that are twisted together to former pair) and coaxial cable (i.e., a solid copper core surrounded by insulator, a combination shield and ground wire, and an outer protective jacket).
A recent and emerging method of implementing a network within a home, office or multi-unit dwelling proposes utilizing existing and installed telephone cable within the structure as the guided medium via which nodes may transmit and receive information. Such telephone cable (a.k.a. Plain Old Telephone Service (POTS) wiring) is often Category 1 or Category 2 Unshielded Twisted-Pair (UTP) telephone cable, and may accordingly be particularly susceptible to background noise. Specifically, such cable is specifically susceptible to background noise generated by external sources, such as adjacent lines, dimmer switches, AC and DC motors and modems.
SUMMARY OF THE INVENTION
According to the invention, there is provided a method of detecting signals propagated on a carrier medium. A noise threshold level, relative to a noise signal on a carrier medium, is determined. A peak threshold level, relative to peaks of a data signal, is determined. A data threshold level is calculated using the noise threshold level and the peak threshold level. A data pulse signal is detected on traversal of the data threshold level by the data signal.
Other features of the present invention will be apparent from the accompanying drawings and from the detailed description that follows.
REFERENCES:
patent: 5144929 (1992-09-01), Hosoya et al.
patent: 5844632 (1998-12-01), Kishigami et al.
patent: 5963595 (1999-10-01), Graham et al.
patent: 5974083 (1999-10-01), Fujita
Jeffress Jeremiah M.
Loyer Marc A.
Blakely & Sokoloff, Taylor & Zafman
Emmanuel Bayard
Pham Chi
Tut Systems, Inc.
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