Modem initialization process for line code and rate selection in

Details Modem initialization process for line code and rate selection in Modem initialization process for line code and rate selection in

1996-10-31

1999-11-16

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

H04B 138, H04L 516

Patent

active

059870613

ABSTRACT:
A modem that operates selectively in the voice-band frequency band and at higher frequency bands is provided. This modem supports multiple line codes, like DMT and CAP. The modem uses a Digital Signal Processor (DSP), so that different existing ADSL line codes, such as Discrete MultiTone (DMT) and Carrierless AM/PM (CAP), can be implemented on the same hardware platform. The modem negotiates in real-time, for a desired line transmission rate to accommodate line condition and service-cost requirement. The line code and rate negotiation process may be implemented at the beginning of each communication session through the exchange of tones between the modems. A four-step MDSL modem initialization process is provided for line code and rate compatibility.

REFERENCES:
patent: Re31253 (1983-05-01), Weinstein
patent: 4087654 (1978-05-01), Mueller
patent: 4234852 (1980-11-01), McCorkle
patent: 4247940 (1981-01-01), Mueller et al.
patent: 4464545 (1984-08-01), Werner
patent: 4682358 (1987-07-01), Werner
patent: 4800573 (1989-01-01), Cupo
patent: 4924492 (1990-05-01), Gitlin et al.
patent: 5052000 (1991-09-01), Wang et al.
patent: 5214637 (1993-05-01), Fridhar et al.
patent: 5285474 (1994-02-01), Chow et al.
patent: 5317596 (1994-05-01), Ho et al.
patent: 5353280 (1994-10-01), Ungerbock
patent: 5400322 (1995-03-01), Hunt et al.
patent: 5461640 (1995-10-01), Gatherer
patent: 5463661 (1995-10-01), Moran, III et al.
patent: 5479447 (1995-12-01), Chow et al.
patent: 5644594 (1997-07-01), Johnson et al.
Crespo, P., et al., Pole-Zero Decision Feedback Equalization for the Digital Subscriber Loop, Globecom '90, IEEE Global Telecomm. Conf. & Exhibit, San Diego, CA, Dec. 2-5 1990, "Communications: Connecting the Future"; CH2827-4/90/0000-11666, 1990 IEEE, pp. 1166-1171.
Sistanizadeh, K., Analysis and Performance Evaluation Studies of High Bit Rate Digital Subscriber Lines (HDSL) Using QAM and PAM Schemes With Ideal Decision Feedback Equalization (DFE) Within a Carrier Serving Area (CSA), Globecom '90, IEEE Global Telecomm. Conf. & Exhibit, San Diego, CA, Dec. 2-5 1990, "Communications: Connecting the Future"; CH2827-4/90/0000-1172, 1990 IEEE.
Veeneman, D., et al., ADSL for Video and Data Service, ICC '95 Seattle, WA, Communications--Gateway to Globalization, 1995 IEEE Int'l Conf. on Comm., Jun. 18-22, 1995; 0-7803-2486-Feb. 1995, 1995 IEEE.
Cook, John, Splitter for VDSL, T1E1.4 Contribution, American Nat'l Standards Institute Telecommunications Committee (ANSI/T1), Jan. 22-25, 1996, Irvine, CA Meeting, 10 pages.
Honig, M.L., et al., Suppression of Near- and Far-End Crosstalk by Linear Pre- and Post-Filtering, IEEE Journal on Selection Areas in Comm., vol. 10, No. 3, Apr. 1992, pp. 614-629.
Cioffi, J.M., et al., Detailed DMT Transmitter Description for ADSL, ANSI T1E1.4 Committee Contribution No. 93-084, Chicago, Apr. 1993, pp.
Cioffi, J.M., et al., DMT Specification Overview for ADSL, ANSI T1E1.4 Committee Contribution No. 93-083, Chicago, Apr. 1993, pp.
Chow, J.S., Finite-Length Equalization for Multi-Carrier Transmission Systems, Ph.D. Dissertation, Stanford University, California, Jun. 1992.
Chow, J.S., et al., Equalizer Training Algorithms for Multi-Carrier Modulation Systems, 1993 Int'l Conf. on Communications, Geneva, May 1993, pp. 761-765.
Chow, J.S., et al., Recommended Training Sequence for Time-domain Equalizers (TQE) With DMT, ANSI T1E1.4 Committee Contribution No. 93-968, pp.
The Applied Technologies Group, AT&T Paradyne, ADSL, SDSL, HDSL, Copper Phone Line Technologies for Multimedia, Pocket Guide, One Apple Hill, #316, Natick, MA 01760 pp. 1-41.
AT&T Paradyne, News Release, Bell Atlantic Supports AT&T Paradyne's GlobeSpan.TM. Technology, Largo, Florida, Nov. 1, 1995, 34 pages.
Maxwell, Kim, Study Project: ADSL Issue II--Variable Rate ADSL, Independent Editions, 22 Apr. 1996, 1057 University Ave., Palo Alto, CA 94301, T1E1.4/95-129, 2 pages.
Starr, Tom Project: ADSL--Rate Adaptive DSL, Apr. 22, 1996, Colorado Springs, Ameritech, 2000 W. Ameritech Drive, Rm. 3C52, Hoffman Estates, IL 60196, pp. 1-5.
Keyes, Philip J., ADSL Standard Project--Proposal for Annex to ADSL Standard, Apr. 22, 1996, Col. Springs, CO, Bell South Telcomm., 3535 Colonnade Pkwy, Rm W1D1, Birmingham, AL 35243, 3 pgs.
Cook, John, Telephony Transmission and Splitters, Passive and Active, T1E1.4 Contribution, American Nat'l Standards Institute Telecomm. Comm. (ANSI/T1), Feb. 14-18, 1994 San Francisco Mtg, 14 pages.
Cioffi, J.M., et al., Project: T1E1.4: ADSL--Rate Adaptative and the ANSI T1.413 DMT ADSL Data Rate Throttle, Amati Comm. Corp., 1975 Mountain View, CA 94040, pp. 1-10.
Scholtz, W.H., et al., Study Project; HDSL Study Project--Variable Bit Rate ADSL Using Carrierless AM/PM (CAP), Lucent Technologies, 101 Crawfords, Corner Rd., Rm. 4L-322, Holmdel, NJ 07733-3030, pp. 1-4.
Lechleider, J.W., The Capacity of Next-Impaired Subscriber Loops, Bellcore, Globecom '90, IEEE Global Telecomm. Conf. & Exhibit, San Diego, CA, Dec. Dec. 2-5, 1990, "Communications: Connecting the Future"; CH2827-4/90/0000,1990 IEEE.
ADSL Forum WWW Site, Dec., 1995: About the ADSL Forum, 8 pages.
ADSL Forum WWW Site, Dec., 1995: ADSL--Twisted Pair Access to the Information Highway, 4 pages.
ADSL Forum WWW Site, Dec., 1995: VDSL--Fiber-Copper Access to the Information Highway, 7 pages.
ADSL Forum WWW Site, Dec., 1995: A Tutorial Glossary of Copper Access Transmission Terminology, 10 pages.
ADSL Forum WWW Site, Dec., 1995: The World is Already Wired for Multimedia Communications, 2 pages.
ADSL Forum WWW Site, Dec., 1995: Working Text: Interfaces and System Configurations for ADSL: Bit Synchronous Mode, 15 pages.
ADSL Forum WWW Site, Dec., 1995: Daly, Tom (editor), Study Project: Packet Mode Technical Group Working Text, 12 pages.
Integrated Circuit Engineering Corporation, A Study of the MPU, MCU & DSP Markets, Digital Signal Processors, Microprocessor 1996,Editor: Bill McClean, Author: Jack Quinn, Scottsdale, AZ, pp. 12-19 to 12-33.

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