Integrated modem and line-isolation circuitry and associated...

Details Integrated modem and line-isolation circuitry and associated... Integrated modem and line-isolation circuitry and associated...

2000-06-26

2004-08-03

Chin, Stephen (Department: 2634)

Pulse or digital communications

Transceivers

Modems

C375S258000, C379S093050

Reexamination Certificate

active

06771696

ABSTRACT:

TECHNICAL FIELD OF THE INVENTION
This invention relates to line isolation circuitry and modem architecture for communication lines. More particularly, this invention relates to circuitry used in connection with isolation systems for connecting to phone lines.
BACKGROUND
New generations of consumer appliances like set-top boxes, payphones, vending machines and other systems often require or prefer low-speed data modems. Such modems allow remote hosts to handle billing or other housekeeping functions, or permit “smart” vending machines to call for more supplies. Although typical microprocessor and digital-signal-processor (DSP)-based multimedia chips employed in set-top boxes and other systems are capable of implementing a low-speed modem, they would do so at an undesirable manufacturing complexity and expense.
Prior modem architectures typically included multiple integrated circuits for handling modem processing and communication line termination. In particular, one or more digital-signal-processor chips have been coupled to analog-front-end circuitry, which in turn has been connected to line termination circuitry across a transformer isolation barrier. Such modem architectures suffer from numerous disadvantages.
SUMMARY OF THE INVENTION
The present invention provides an improved modem architecture and associated method that integrate modem and line-isolation circuitry so as to achieve modem functionality and system-side isolation functionality on a single integrated circuit.
The combined modem and line isolation system has both on-hook and off-hook intrusion detection for use with parallel connected phone line connection devices. During on-hook intrusion detection, when the combined modem and line isolation system is on-hook the system can detect if other parallel connected phone line connection devices are already off-hook. During off-hook intrusion detection, when the combined modem and line isolation system is off-hook the system can detect if other parallel connected phone line connection devices are attempting to go off-hook. On-hook intrusion detection may be accomplished by monitoring the phone line voltage through a pin utilized for setting DC termination characteristics.


REFERENCES:
patent: 4395590 (1983-07-01), Pierce et al.
patent: 4417099 (1983-11-01), Pierce
patent: 5003573 (1991-03-01), Agah et al.
patent: 5259003 (1993-11-01), Berger et al.
patent: 5280598 (1994-01-01), Osaki et al.
patent: 5369666 (1994-11-01), Folwell et al.
patent: 5369687 (1994-11-01), Farkas
patent: 5467385 (1995-11-01), Reuben et al.
patent: 5535242 (1996-07-01), Brigida et al.
patent: 5535265 (1996-07-01), Suwandhaputra
patent: 5602902 (1997-02-01), Satterlund et al.
patent: 5654984 (1997-08-01), Hershbarger et al.
patent: 5655009 (1997-08-01), Arai et al.
patent: 5655010 (1997-08-01), Bingel
patent: 5687194 (1997-11-01), Paneth et al.
patent: 5790656 (1998-08-01), Rahamim et al.
patent: 5870046 (1999-02-01), Scott et al.
patent: 6005923 (1999-12-01), Lee
patent: 6075845 (2000-06-01), Gizara et al.
patent: 6081586 (2000-06-01), Rahamim et al.
patent: 6104791 (2000-08-01), Gizara et al.
patent: 6167121 (2000-12-01), Arai
patent: 6167132 (2000-12-01), Krone et al.
patent: 6169762 (2001-01-01), Embree et al.
patent: 6198816 (2001-03-01), Hein et al.
patent: 6212272 (2001-04-01), Herschler et al.
patent: 6222922 (2001-04-01), Scott et al.
patent: 6298133 (2001-10-01), Hein et al.
patent: 6301341 (2001-10-01), Gizara et al.
patent: 6304597 (2001-10-01), Dupuis et al.
patent: 6351530 (2002-02-01), Rahamim et al.
patent: 6359972 (2002-03-01), Schott et al.
patent: 6359973 (2002-03-01), Rahamim et al.
patent: 6389063 (2002-05-01), Kanekawa et al.
patent: 6456703 (2002-09-01), Lee
patent: 6480602 (2002-11-01), Dupuis et al.
patent: 6498825 (2002-12-01), Dupuis et al.
patent: 0 881 805 (1998-12-01), None
patent: 0 973 305 (2001-01-01), None
patent: 11-187140 (1999-07-01), None
patent: WO98/44687 (1998-10-01), None
patent: WO 98/48541 (1998-10-01), None
Kojima, Y. et al (“A Novel Monolithic Isolator for a Communications Network Interface IC,” The 9-th Annual IEEE Int'l ASIC Conf., pp. 255-258 (1998)).*
Silicon Systems (SSI 73D2950/2950T Low Power FAX/Data Modem Chip Set Advance Information, pp. 4-75-4-105, Dec. 1993).*
Zilog (Preliminary Product Specification DS97FMO0201 Z02201 V.22bis Modem Data Pump with Integrate AFE, 1998).*
Silicon Systems,SSI 73D2950/2950T Low Power FAX/Data Modem Chip Set Advance Information, pp. 4-75-4-105, Dec. 1993.
Krypton, “K2930G Functional and Electrical Descriptions”, 10 pages (1997).
Information Sheet—Siemens,DAA2000 Optical DAA Kit—Preliminary, pp. 1-21; Jun. 13, 1997.
Siemens Press Release,Siemens Pioneers Programmable Front End For Analog Modems Single Design For Worldwide Standards, Aug. 6, 1997.
Information Sheet—Siemens,ICs for Communications, ALIS Reference Board, SIPB 4595 Version 1.0, Technical Description 06.97, Q67220-H1014, Jun. 1997.
Information Sheet—Siemens,ICs for Communications, ALIS Evaluation Board, SIPB 45900 Version 1.1, Technical Description 06.97, Q67220-H1047, Jun. 1997.
Data Sheet SmartMC™Modem Codec,Host-Processed, V.90/K56flex™Modem Codec(MC)Device Set with SmartDAA198 Technology for AC-link(AC'97 2.1)Applications, Mar. 1999.
Rockwell Semiconductor Systems,RC96V24DP, Single Device Data/Fax Modem Data Pump, Sep. 1998.
CP ClareCPC2400 Preliminary Specifications, Oct. 1998.
TDK Semiconductor Corp.,73K224BL V.22bis/V.22//V.21/Bell 212A/103 Single-Chip Modem w/Integrated Hybrid, Nov. 1997.
ZilogPreliminary Product Spefication DS97FMO0201 Z02201 V.22bis Modem Data Pump with Integrated AFE, 1998.
Silicon Laboratories,Si3032 Direct Digital Access Arrangement(DDAA), Nov. 1997.
International Search Report dated Oct. 19, 2000.

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