US4601035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data communication method and circuitry
Assignee: AMERICAN BELL Inc A CORP OF
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Filing: 1983-10-03
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Granted: 1986-07-15
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Expires: 2003-10-03
Abstract
Abstract A data communication method and circuitry which uses a compatible subset of a standard high level data link control (HDLC) protocol to control link level communication between a digital terminal and a switch. The use of the subset of HDLC protocol reduces the complexity of the digital terminal design while maintaining communication compatibility with a switch which uses either the standard HDLC protocol or the subset of HDLC protocol.
Inventors
- 👤 Richard P. Marzec
- 👤 George W. Schramm
- 👤 John B. Sharp
- 👤 David J. Stelte
- 👤 David M. Tutelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:11
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04L; H04L9/00; H04L9/40; H04L69/00; H04L69/30; H04L69/32; H04L69/322; H04L69/324
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
58 words
A terminal for receiving numbered data transmissions (I) over a facility, said terminal comprising: means responsive to a received correctly numbered data transmission for transmitting a numbered acknowledge signal (RR) over said facility identifying said correctly numbered data transmission, and means for transmitting only said numbered acknowledge signal in response to a subsequently received incorrectly numbered data transmission.
Claim 2
Dependent Claim
58 words
A terminal for receiving numbered data transmissions (I) over a facility, said terminal comprising: means responsive to a received correctly numbered data transmission for transmitting a numbered acknowledge signal (RR) over said facility identifying said correctly numbered data transmission, and means for transmitting only said numbered acknowledge signal in response to a subsequently received incorrectly numbered data transmission.
Claim 3
Dependent Claim
22 words
The terminal of claim 1 including means responsive to a start signal for transmitting a disconnect mode signal (DM) over said facility.
Claim 4
Dependent Claim
26 words
The terminal of claim 1 further including means responsive to a received set mode signal (SABM) for transmitting an unnumbered acknowledge signal (UA) over said facility.
Claim 5
Dependent Claim
73 words
In a data communication system including a switch and terminal for communicating numbered data transmissions (I) over a facility, said switch arranged to communicate using a HDLC protocol and said terminal comprising: means responsive to a received correctly numbered data transmission for transmitting a numbered acknowledge signal (RR) identifying said correctly numbered data transmission, and means for transmitting only said numbered acknowledge signal in response to a subsequently received incorrectly numbered data transmission.
Claim 6
Dependent Claim
73 words
In a data communication system including a switch and terminal for communicating numbered data transmissions (I) over a facility, said switch arranged to communicate using a HDLC protocol and said terminal comprising: means responsive to a received correctly numbered data transmission for transmitting a numbered acknowledge signal (RR) identifying said correctly numbered data transmission, and means for transmitting only said numbered acknowledge signal in response to a subsequently received incorrectly numbered data transmission.
Claim 7
Dependent Claim
22 words
The system of claim 4 wherein said terminal includes means responsive to a start signal for transmitting a disconnect mode signal (DM).
Claim 8
Dependent Claim
26 words
The system of claim 4 wherein said terminal further includes means responsive to a received set mode signal (SABM) for transmitting an unnumbered acknowledge signal (UA).
Claim 9
Dependent Claim
114 words
In a data communication system including a switch and a terminal for communicating numbered data transmissions (I) over a facility said terminal comprising: means responsive to a received correctly numbered switch data transmission for transmitting a numbered acknowledge signal (RR) identifying said correctly numbered switch data transmission and means for transmitting only said numbered acknowledge signal in response to a subsequently received incorrectly numbered switch data transmission and said switch comprising means responsive to a received correctly numbered terminal data transmission for transmitting a numbered acknowledge signal (RR) identifying said correctly numbered terminal data transmission and means for transmitting said numbered acknowledge signal in response to a subsequently received incorrectly numbered terminal data transmission.
Claim 10
Dependent Claim
114 words
In a data communication system including a switch and a terminal for communicating numbered data transmissions (I) over a facility said terminal comprising: means responsive to a received correctly numbered switch data transmission for transmitting a numbered acknowledge signal (RR) identifying said correctly numbered switch data transmission and means for transmitting only said numbered acknowledge signal in response to a subsequently received incorrectly numbered switch data transmission and said switch comprising means responsive to a received correctly numbered terminal data transmission for transmitting a numbered acknowledge signal (RR) identifying said correctly numbered terminal data transmission and means for transmitting said numbered acknowledge signal in response to a subsequently received incorrectly numbered terminal data transmission.
Claim 11
Dependent Claim
44 words
The data communication system of claim 7 wherein said terminal includes means responsive to a start signal for transmitting a disconnect mode signal (DM), and said switch includes means responsive to a link set up request signal for transmitting a set mode signal (SABM).
Claim 12
Dependent Claim
28 words
The data communication system of claim 7 wherein said terminal further includes means responsive to a received set mode signal (SABM) for transmitting an unnumbered acknowledge signal (UA).
Claim 13
Independent Claim
56 words
A method of receiving numbered data transmission (I) over a facility, comprising the steps of: transmitting a numbered acknowledge signal (RR) over said facility in response to and identifying a received correctly numbered data transmission received over said facility and transmitting only said numbered acknowledge signal in response to a subsequently received incorrectly numbered data transmission.
Claim 14
Independent Claim
56 words
A method of receiving numbered data transmission (I) over a facility, comprising the steps of: transmitting a numbered acknowledge signal (RR) over said facility in response to and identifying a received correctly numbered data transmission received over said facility and transmitting only said numbered acknowledge signal in response to a subsequently received incorrectly numbered data transmission.
Claim 15
Independent Claim
86 words
A method of operating a data communication system including a switch and terminal for communicating numbered data transmissions (I) over a facility, said switch arranged to communicate using a HDLC protocol, the method comprising the steps of: transmitting from said terminal a numbered acknowledge signal (RR) over said facility in response to and identifying a received correctly numbered data transmission from said switch and transmitting from said terminal only said numbered acknowledge signal in response to a subsequently received incorrectly numbered data transmission from said switch.
Claim 16
Independent Claim
86 words
A method of operating a data communication system including a switch and terminal for communicating numbered data transmissions (I) over a facility, said switch arranged to communicate using a HDLC protocol, the method comprising the steps of: transmitting from said terminal a numbered acknowledge signal (RR) over said facility in response to and identifying a received correctly numbered data transmission from said switch and transmitting from said terminal only said numbered acknowledge signal in response to a subsequently received incorrectly numbered data transmission from said switch.
Claim 17
Independent Claim
77 words
A method of operating a data communication system including a switch and a terminal for communicating numbered data transmissions (I) over a facility, the method of operating said switch and said terminal comprising the steps of: transmitting a numbered acknowledge signal (RR) over said facility in response to and identifying a received correctly numbered data transmission received over said facility and transmitting only said numbered acknowledge signal in response to a subsequently received incorrectly numbered data transmission.
Claim 18
Independent Claim
77 words
A method of operating a data communication system including a switch and a terminal for communicating numbered data transmissions (I) over a facility, the method of operating said switch and said terminal comprising the steps of: transmitting a numbered acknowledge signal (RR) over said facility in response to and identifying a received correctly numbered data transmission received over said facility and transmitting only said numbered acknowledge signal in response to a subsequently received incorrectly numbered data transmission.
References Cited (Backward Citations)
US3979719A
Cited
US4432090A
Cited
US4439859A
Cited
US4507782A
Cited
US4512017A
Cited
US4512016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |