Richard C Causey

US Patent:

20020141440, Oct 3, 2002

Filed:

Feb 12, 2002

Appl. No.:

10/073098

Inventors:

Patrick Stanley - Suwanee GA, US
David Walford - Alpharetta GA, US
Clinton Earnest - Marietta GA, US
Robert Fahler - Alpharetta GA, US
Richard Causey - Alpharetta GA, US

International Classification:

H04J001/00

US Classification:

370/465000, 370/480000

Abstract:

A system and method of the present invention improves data transmission speeds by fixing the lower corner frequency at a frequency above voice band in a symmetric DSL transmission system. By using a fixed lower corner frequency that is above the voiceband and increasing the upper corner frequency upward as the symbol rate increases, the communication equipment systems utilize symmetric frequency plans that incorporate the relatively low loss, low crosstalk spectrum range while still being able to operate on the same line as analog voice band. Another aspect of the present invention is directed to multiplexing a first modem for communicating information packets between the first modem and a plurality of second modems via a single two-wire (e.g. telephone subscriber) lines. The present invention provides a Multi-Access (MA) protocol that enables a single link to be utilized by more than one access device (e.g., a CPE Modem). The Multi-Access protocol of the present invention provides a means to connect to multiple endpoints on a single local loop. Each CPE Modem may communicate directly with a modem at a CO location thereby removing the need for expensive gateway devices and secondary in-building cabling to support multiple access points.

US Patent:

20100021172, Jan 28, 2010

Filed:

Jul 25, 2008

Appl. No.:

12/179745

Inventors:

Amin Farvez - Lawrenceville GA, US
Richard J. Futch - Lawrenceville GA, US
Richard T. Causey - Suwanee GA, US
Michael Jones - Grayson GA, US

Assignee:

CISCO TECHNOLOGY, INC. - San Jose CA

International Classification:

H04J 14/08

US Classification:

398 98

Abstract:

Upstream data handling in a digital Data Over Cable Service Interface Specification (DOCSIS) passive optical network (DPON). Embodiments include receiving at a headend, in an upstream path over an optical network, a plurality of digitized and serialized DPON upstream packets respectively distributed in a time division multiplexed fashion, wherein each DPON upstream packet includes a header, a trailer and a payload, monitoring the optical network for energy in the upstream path, including energy associated with a header and a trailer of respective DPON upstream packets, controlling a bit stuffer that adds bits to the upstream path to (1) stop adding bits to the upstream path when energy is detected in the upstream path and (2) resume adding bits to the upstream path after an end of a trailer of a given DPON upstream packet has been detected, and removing the header and the trailer of the respective DPON upstream packets. The resulting original payload is then digital to analog converted, and the resulting data is passed to, e.g., a cable modem termination system (CMTS).

Address:

PO Box 751, Santa Barbara, CA 93102

VIN:

2T2GK31U17C002072

Make:

LEXUS

Model:

RX 350

Year:

2007