Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1998-07-20
2002-04-09
Vu, Huy D. (Department: 2664)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S271000, C370S352000, C379S093060, C379S428030
Reexamination Certificate
active
06370149
ABSTRACT:
TECHNICAL FIELD
The present invention relates to telecommunication systems, and in particular to subscriber units and methods for interfacing with digital lines.
BACKGROUND OF THE INVENTION
Most telephone service subscribers today use familiar analog Plain Old Telephone Service (“POTS”) for placing ordinary voice telephone calls. POTS is typically delivered over a subscriber loop of copper wires installed between each subscriber location, such as a home or office, and the local telephone company (“telco”) central office. Over the pair of copper wires, voice signals are transmitted between subscribers and the telco central office. The central office then provides circuit-switching equipment to establish connections between subscribers. In such a circuit-switched system, a circuit connection is established for each call and is maintained for the duration of the call.
Recently, on-line computer services, such as the Internet, have changed the way subscribers use their telephones. On-line computer services typically make a dial-up telephone number available for users with a modem to access the service. Many users of on-line computer services now spend several hours each day on the telephone connected to services such as the Internet. Such a usage pattern ties up the telephone for incoming calls and causes a strain for other members of the household who wish to place calls. In response, households have added a second telephone line for computer data traffic. To provide a second telephone line, a second pair of copper wires is usually provided between the subscriber's location and the telco central office. In addition to more copper wiring, a second telephone line also requires additional central office connection and transmission equipment.
Recently, higher capacity data transmission services have become available to carry a subscriber's computer data to remote computer systems. Such data transmission services often carry data on the same copper pair utilized by POTS. To allow simultaneous data and POTS service and provide greater bandwidth, higher capacity data services operate at frequencies above the 1 KHz to 4 KHz voice frequency band used by POTS. For example, such data services may operate in the frequency range around 80 KHz or higher.
The growing popularity of on-line computer services has also challenged the assumptions upon which the telephone network was constructed. The public switched telephone network (PSTN) is designed with the assumption that only about 10% of residential users and 20% of business users are using the telephone at any given time. The PSTN telephone line and associated circuit-switching equipment are thus designed to be shared by only the fraction of subscribers actually using the telephone at any time. Now, many households use the telephone for several hours each day to carry data traffic to computer services. Using a POTS circuit-switched telephone call to carry data traffic inefficiently consumes hardware resources, since a dedicated circuit connection is consumed for the entire duration of the call.
More recently, packet-switched data networks have been established to carry high-speed data traffic between distributed computer systems. In addition to providing higher data rates, packet-switched networks are more hardware efficient than circuit-switched networks for carrying data. A packet-switched network establishes a virtual circuit connection which uses transmission resources only when data is actually transmitted. Such a virtual connection is well suited for users of computer services who are connected for long periods of time and spend a relatively small proportion of time actually transmitting and receiving data.
Despite the change in communication needs and usage patterns, most data traffic from homes or small offices is carried by POTS voice lines.
REFERENCES:
patent: 3898390 (1975-08-01), Wells et al.
patent: 4430731 (1984-02-01), Gimple et al.
patent: 4449218 (1984-05-01), Strehl
patent: 4512013 (1985-04-01), Nash et al.
patent: 4650930 (1987-03-01), Hogeboom et al.
patent: 4670874 (1987-06-01), Sato et al.
patent: 4740955 (1988-04-01), Litterer et al.
patent: 4901342 (1990-02-01), Jones
patent: 5127041 (1992-06-01), O'Sullivan
patent: 5214650 (1993-05-01), Renner et al.
patent: 5291479 (1994-03-01), Vaziri et al.
patent: 5305312 (1994-04-01), Fornek et al.
patent: 5353334 (1994-10-01), O'Sullivan
patent: 5410343 (1995-04-01), Coddington et al.
patent: 5428608 (1995-06-01), Freeman et al.
patent: 5440585 (1995-08-01), Partridge, III
patent: 5448555 (1995-09-01), Bremer et al.
patent: 5448635 (1995-09-01), Biehl et al.
patent: 5459730 (1995-10-01), Bliven
patent: 5463616 (1995-10-01), Kruse et al.
patent: 5469496 (1995-11-01), Emery et al.
patent: 5473613 (1995-12-01), Bliven
patent: 5475735 (1995-12-01), Williams et al.
patent: 5479491 (1995-12-01), Garcia et al.
patent: 5502760 (1996-03-01), Gilbert et al.
patent: 5506866 (1996-04-01), Bremer et al.
patent: 5511075 (1996-04-01), Bhasker
patent: 5519731 (1996-05-01), Cioffi
patent: 5519763 (1996-05-01), Namekawa et al.
patent: 5524047 (1996-06-01), Brown et al.
patent: 5528281 (1996-06-01), Grady et al.
patent: 5528285 (1996-06-01), Morikawa et al.
patent: 5528666 (1996-06-01), Weigand et al.
patent: 5533019 (1996-07-01), Jayapalan
patent: 5533105 (1996-07-01), Brown et al.
patent: 5535204 (1996-07-01), Li
patent: 5537436 (1996-07-01), Bottoms et al.
patent: 5550649 (1996-08-01), Wong et al.
patent: 5555258 (1996-09-01), Snelling et al.
patent: 5563938 (1996-10-01), Soshea
patent: 5572372 (1996-11-01), Kawan et al.
patent: 5592538 (1997-01-01), Kosowsky et al.
patent: 5598456 (1997-01-01), Feinberg
patent: 5602837 (1997-02-01), Takahashi
patent: 5603095 (1997-02-01), Uola
patent: 5610910 (1997-03-01), Focsaneanu et al.
patent: 5610972 (1997-03-01), Emery et al.
patent: 5613191 (1997-03-01), Hylton et al.
patent: 5617450 (1997-04-01), Kakuishi et al.
patent: 5630204 (1997-05-01), Hylton et al.
patent: 5636266 (1997-06-01), Ranganath et al.
patent: 5640444 (1997-06-01), O'Sullivan
patent: 5644629 (1997-07-01), Chow
patent: 5664003 (1997-09-01), Foladare et al.
patent: 5761292 (1998-06-01), Wagner
patent: 5790548 (1998-08-01), Sistanizadeh et al.
patent: 5793498 (1998-08-01), Scholl et al.
patent: 5796729 (1998-08-01), Greaney et al.
patent: 5842111 (1998-11-01), Byers
patent: 5854829 (1998-12-01), Hughes-Hartogs
patent: 5862202 (1999-01-01), Bashoura et al.
patent: 5864763 (1999-01-01), Leung et al.
patent: 5878078 (1999-03-01), Griffin et al.
patent: 5889774 (1999-03-01), Mirashrafi et al.
patent: 5889856 (1999-03-01), O'Toole et al.
patent: 5892591 (1999-04-01), Anglin, Jr. et al.
patent: 5892764 (1999-04-01), Riemann et al.
patent: 5905781 (1999-05-01), Mchale et al.
patent: 5937040 (1999-08-01), Wrede et al.
patent: 5943404 (1999-08-01), Sansom et al.
patent: 5949763 (1999-09-01), Lund
patent: 5970069 (1999-10-01), Kumar et al.
patent: 5991292 (1999-11-01), Focsneanu et al.
patent: 6005677 (1999-12-01), Suzuki
patent: 6005873 (1999-12-01), Amit
patent: 6020915 (2000-02-01), Bruno et al.
patent: 6028867 (2000-02-01), Rawson et al.
patent: 6028917 (2000-02-01), Creamer et al.
patent: 6044107 (2000-03-01), Gatherer et al.
patent: 6044403 (2000-03-01), Gerszberg et al.
patent: 6049531 (2000-04-01), Roy
patent: 6064667 (2000-05-01), Gisby et al.
patent: 6069879 (2000-05-01), Chatter
patent: 6075784 (2000-06-01), Frankel et al.
patent: 6081517 (2000-06-01), Liu et al.
patent: 6130893 (2000-10-01), Whittaker et al.
patent: 6141339 (2000-10-01), Kaplan et al.
patent: 6167120 (2000-12-01), Kikinis
patent: 0 659 007 (1995-06-01), None
patent: 0 659 007 (1995-06-01), None
patent: 0 684 714 (1995-11-01), None
patent: 0 740 451 (1996-10-01), None
patent: 96/29814 (1996-09-01), None
patent: WO 98/20702 (1998-05-01), None
patent: WO 99/53654 (1999-10-01), None
patent: WO 00/65777 (2000-11-01), None
patent: WO 00/65778 (2000-11-01), None
“A Multi-Drop In-House ADSL Distribution Network”, by Peter S. Chow and John M. Cioffi, Serving Humanity Through Communications. Super
Bossemeyer, Jr. Robert Wesley
Goering Scott Christopher
Gorman Michael George
Kagan Denise Violetta
Neumann Jeffrey
Ameritech Corporation
Harper Kevin C.
Vu Huy D.
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