US5459729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital added main line system
Assignee: Tyco International Ltd Bermuda
•
Filing: 1989-07-25
•
Granted: 1995-10-17
•
Expires: 2009-07-25
Abstract
Abstract A method and apparatus for transmitting and receiving multiple telephone transmission signals over a single twisted pair. An analog signal from a local switching station is converted to an 80 kbits/sec signal for transmission over a twisted pair. A remote terminal converts the 80 kbits/sec signal back into a conventional analog signal for use in conventional telephone, facsimile or other related equipment.
Inventors
- 👤 David C. Bliven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:23
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04J3/18; H04M; H04M11/00; H04M11/06; H04M11/068; H04Q11/0435; H04Q11/0471; H04Q2213/00; H04Q2213/034; H04Q2213/09; H04Q2213/099; H04Q2213/13034; H04Q2213/1305; H04Q2213/1308; H04Q2213/13106; H04Q2213/13174; H04Q2213/1319; H04Q2213/13199; H04Q2213/13204; H04Q2213/13208; H04Q2213/13209; H04Q2213/13216; H04Q2213/13292; H04Q2213/13297; H04Q2213/1332; H04Q2213/13322; H04Q2213/13367; H04Q2213/18; H04Q2213/204
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
234 words
A digital added main line comprising: a) a remote terminal for use at a subscriber location, said remote terminal comprising: i) a remote terminal ISDN echo cancellation integrated circuit for converting digital quaternary signals on a twisted pair line to binary signals and converting binary signals to quaternary signals for transmission over said twisted pair line; ii) a remote terminal ISDN communications controller integrated circuit coupled to said remote terminal ISDN echo cancellation circuit for adding and removing control information to and from a data stream from and to said remote terminal ISDN echo cancellation circuit; and iii) a remote terminal subscriber interface codac filter integrated circuit coupled to said remote terminal ISDN communications controller circuit for converting binary signals from and to said remote terminal ISDN echo cancellation circuit to and from at least two analog signals for use in subscriber equipment; and b) a master comprising: i) a master subscriber interface codac filter (SICOFI) integrated circuit for conversion of analog signals at a local switch to and from digital binary signals; ii) a master ISDN communications controller integrated circuit coupled to said master SICOFI for adding and removing control information to and from a data stream from said SICOFI; and iii) a master ISDN echo cancellation integrated circuit coupled to said master ISDN communications controller for conversion of digital binary signals to and from quaternary signals for transmission over said twisted pair.
Claim 2
Dependent Claim
234 words
A digital added main line comprising: a) a remote terminal for use at a subscriber location, said remote terminal comprising: i) a remote terminal ISDN echo cancellation integrated circuit for converting digital quaternary signals on a twisted pair line to binary signals and converting binary signals to quaternary signals for transmission over said twisted pair line; ii) a remote terminal ISDN communications controller integrated circuit coupled to said remote terminal ISDN echo cancellation circuit for adding and removing control information to and from a data stream from and to said remote terminal ISDN echo cancellation circuit; and iii) a remote terminal subscriber interface codac filter integrated circuit coupled to said remote terminal ISDN communications controller circuit for converting binary signals from and to said remote terminal ISDN echo cancellation circuit to and from at least two analog signals for use in subscriber equipment; and b) a master comprising: i) a master subscriber interface codac filter (SICOFI) integrated circuit for conversion of analog signals at a local switch to and from digital binary signals; ii) a master ISDN communications controller integrated circuit coupled to said master SICOFI for adding and removing control information to and from a data stream from said SICOFI; and iii) a master ISDN echo cancellation integrated circuit coupled to said master ISDN communications controller for conversion of digital binary signals to and from quaternary signals for transmission over said twisted pair.
Claim 3
Dependent Claim
38 words
A digital added main line as recited in claim 1 wherein said remote terminal is located at a terminus of said twisted pair at a home or office and said master is located at a telephone company switch.
Claim 4
Dependent Claim
30 words
A digital added main line as recited in claim 1 wherein said remote terminal and master ISDN echo cancellation circuits are adapted to transmit and receive substantially 80 ksymbols/sec signals.
Claim 5
Dependent Claim
29 words
A digital added main line as recited in claim 1 wherein said remote terminal and master ISDN communications controllers are adapted to transmit and receive substantially 160 kbits/sec signals.
Claim 6
Dependent Claim
215 words
In a system for transmission of a single analog signal from a telephone company location to a subscriber location over a twisted pair, a method of converting said system to a system for multiple signal transmission over said twisted pair comprising: a) installing master equipment at said telephone company location, said master equipment: i) inputting multiple incoming telephone company analog signals from telephone company equipment and outputting multiple outgoing telephone company analog signals to said telephone company equipment; ii) converting said multiple incoming telephone company analog signals to a multiplexed outgoing 2B1Q signal and converting a multiplexed incoming 2B1Q signal to said multiple outgoing telephone company analog signals; and iii) transmitting said multiplexed outgoing 2B1Q signal over said twisted pair to said subscriber location and receiving said multiplexed incoming 2B1Q signal; and b) installing a remote terminal at said subscriber location, said remote terminal: i) inputting said multiplexed outgoing 2B1Q signal-from said twisted pair and outputting said multiplexed incoming 2B1Q signal on said twisted pair; ii) converting said multiplexed outgoing 2B1Q signal to multiple outgoing subscriber analog signals and converting multiple incoming subscriber analog signals to said multiplexed incoming 2B1Q signal; and iii) transmitting said multiple outgoing subscriber analog signals to subscriber equipment and receiving said multiple incoming subscriber analog signals from said subscriber equipment.
Claim 7
Dependent Claim
215 words
In a system for transmission of a single analog signal from a telephone company location to a subscriber location over a twisted pair, a method of converting said system to a system for multiple signal transmission over said twisted pair comprising: a) installing master equipment at said telephone company location, said master equipment: i) inputting multiple incoming telephone company analog signals from telephone company equipment and outputting multiple outgoing telephone company analog signals to said telephone company equipment; ii) converting said multiple incoming telephone company analog signals to a multiplexed outgoing 2B1Q signal and converting a multiplexed incoming 2B1Q signal to said multiple outgoing telephone company analog signals; and iii) transmitting said multiplexed outgoing 2B1Q signal over said twisted pair to said subscriber location and receiving said multiplexed incoming 2B1Q signal; and b) installing a remote terminal at said subscriber location, said remote terminal: i) inputting said multiplexed outgoing 2B1Q signal-from said twisted pair and outputting said multiplexed incoming 2B1Q signal on said twisted pair; ii) converting said multiplexed outgoing 2B1Q signal to multiple outgoing subscriber analog signals and converting multiple incoming subscriber analog signals to said multiplexed incoming 2B1Q signal; and iii) transmitting said multiple outgoing subscriber analog signals to subscriber equipment and receiving said multiple incoming subscriber analog signals from said subscriber equipment.
Claim 8
Dependent Claim
18 words
The method as recited in claim 5 wherein said twisted pair has a length greater than 1,000 feet.
Claim 9
Dependent Claim
19 words
The method as recited in claim 5 wherein said twisted pair has a length greater than about 15,000 feet.
Claim 10
Dependent Claim
42 words
The method as recited in claim 5, said remote terminal further converting said multiple outgoing subscriber analog signals from a four-wire format to a two-wire format and converting said multiple incoming subscriber analog signals from a two-wire format to a four-wire format.
References Cited (Backward Citations)
US3308240A
Cited
US3510584A
Cited
US3660606A
Cited
US3711650A
Cited
US3824597A
Cited
US3922493A
Cited
US3851106A
Cited
US4001514A
Cited
US4112427A
Cited
US4145574A
Cited
US4100377A
Cited
US4351049A
Cited
US4417333A
Cited
US4381427A
Cited
US4389284A
Cited
JPS5970395A
Cited
JPS59211366A
Cited
US4519073A
Cited
US4577315A
Cited
US4698801A
Cited
US4689789A
Cited
JPS6145699A
Cited
EP0173984A2
Cited
US4712210A
Cited
US4644527A
Cited
US4755994A
Cited
US4751696A
Cited
JPS62159561A
Cited
US4740963A
Cited
US4788680A
Cited
US4771418A
Cited
EP0260470A2
Cited
US4924492A
Cited
EP0370423A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-16 | 1999-04-17 | 1999-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-16 | 2003-04-17 | 2003-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-16 | 2007-04-17 | 2007-10-17 | $7700.00 | Window Closed / Lapsed |