US5369703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Command and control signalling method and apparatus
Assignee: SUMMIT Tech SYSTEMS LP
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Filing: 1993-06-03
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Granted: 1994-11-29
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Expires: 2013-06-03
Abstract
Abstract A local communication apparatus (e.g., a modem) is arranged to detect when a remote communication apparatus desires to switch from the data mode and enter a command/control mode. To accomplish mode switching, the remote apparatus sends a scrambled escape pattern, scrambled using a proprietary polynomial, over the data channel. After detecting the escape pattern the local apparatus switches to the command/control mode. In this mode, the remote and local apparatuses communicate using the proprietary scrambler/descrambler polynomial.
Inventors
- 👤 James L. Archibald
- 👤 William R. Davis
- 👤 Kurt E. Holmquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:30
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/06; H04L9/0618; H04L9/0637
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
200 words
Digital data communication apparatus comprising transmitter means for scrambling an inputted binary data information signal to generate a first bit pattern signal for transmission over a facility, in response to a first state of a mode control signal, and for scrambling an inputted binary control information signal to generate a second bit pattern signal for transmission over said facility, in response to a second state of said control signal; receiver means including first means for descrambling a first bit pattern signal received over said facility into a first information signal, second means for descrambling a second bit pattern signal received over said facility into a second information signal, and selector means, responsive to said first state of said control signal, for selecting said first information signal for output from said receiver means and, responsive to said second state of said control signal, for selecting said second information signal for output from said receiver means; and mode control means, operational when said control signal is in said first state, for detecting a predetermined bit pattern in a received second bit pattern signal and in response thereto changing the state of said control signal from said first state to said second state.
Claim 2
Dependent Claim
200 words
Digital data communication apparatus comprising transmitter means for scrambling an inputted binary data information signal to generate a first bit pattern signal for transmission over a facility, in response to a first state of a mode control signal, and for scrambling an inputted binary control information signal to generate a second bit pattern signal for transmission over said facility, in response to a second state of said control signal; receiver means including first means for descrambling a first bit pattern signal received over said facility into a first information signal, second means for descrambling a second bit pattern signal received over said facility into a second information signal, and selector means, responsive to said first state of said control signal, for selecting said first information signal for output from said receiver means and, responsive to said second state of said control signal, for selecting said second information signal for output from said receiver means; and mode control means, operational when said control signal is in said first state, for detecting a predetermined bit pattern in a received second bit pattern signal and in response thereto changing the state of said control signal from said first state to said second state.
Claim 3
Dependent Claim
37 words
The apparatus of claim 1 wherein said mode control means is responsive to a command mode signal for signaling said second state of said control signal, said command mode signal not originated by said mode control means.
Claim 4
Dependent Claim
26 words
The apparatus of claim 2 wherein said mode control means disables the detection of the received predetermined bit pattern in response to said command mode signal.
Claim 5
Dependent Claim
65 words
The apparatus of claim 1 wherein said transmitter means includes first means for scrambling said inputted binary data information signal into said first bit pattern signal, second means for scrambling said inputted binary control information signal into said second bit pattern signal, and multiplexer means for selecting either said first or said second bit pattern signal in response to the state of said control signal.
Claim 6
Dependent Claim
22 words
The apparatus of claim 1 wherein said mode control means uses said second descrambling means to descramble said second bit pattern signal.
Claim 7
Dependent Claim
43 words
The apparatus of claim 1 wherein said data information signal is scrambled using a first polynomial to generate a first randomized bit pattern signal and said control information signal is scrambled using a second polynomial to generate a second randomized bit pattern signal.
Claim 8
Dependent Claim
21 words
The apparatus of claim 6 wherein said first polynomial is a non-proprietary polynomial, and said second polynomial is a proprietary polynomial.
Claim 9
Dependent Claim
138 words
Receiver apparatus for use in a digital data communication system comprising first means for descrambling a first bit pattern signal received over said facility into a first information signal; second means for descrambling a second bit pattern signal received over said facility into a second information signal; selector means, responsive to a first state of a control signal, for selecting said first information signal for output from said receiver means and, responsive to said second state of said control signal, for selecting said second information signal for output from said receiver means; and mode control means, operational when said control signal is in said first state, for detecting a predetermined bit pattern in a received second bit pattern signal and in response thereto changing the state of said control signal from said first state to said second state.
Claim 10
Dependent Claim
138 words
Receiver apparatus for use in a digital data communication system comprising first means for descrambling a first bit pattern signal received over said facility into a first information signal; second means for descrambling a second bit pattern signal received over said facility into a second information signal; selector means, responsive to a first state of a control signal, for selecting said first information signal for output from said receiver means and, responsive to said second state of said control signal, for selecting said second information signal for output from said receiver means; and mode control means, operational when said control signal is in said first state, for detecting a predetermined bit pattern in a received second bit pattern signal and in response thereto changing the state of said control signal from said first state to said second state.
Claim 11
Dependent Claim
22 words
The receiver apparatus of claim 10 wherein said first polynomial is a non-proprietary polynomial and said second polynomial is a proprietary polynomial.
Claim 12
Dependent Claim
43 words
The apparatus of claim 8 wherein said data information signal is scrambled using a first polynomial to generate a first randomized bit pattern signal and said control information signal is scrambled using a second polynomial to generate a second randomized bit pattern signal.
Claim 13
Independent Claim
172 words
A method of operating a digital data communication apparatus comprising the steps of sending binary data information scrambled into a first bit pattern signal over a facility, in response to a first state of a mode control signal, and sending binary control information scrambled into a second bit pattern signal over said facility, in response to a second state of said control signal; descrambling a first bit pattern signal received over said facility into a first information signal; descrambling a second bit pattern signal received over said facility into a second information signal; in response to said first state of said control signal, selecting said first information signal for output from said apparatus and, in response to said second state of said control signal, selecting said second information signal for output from said apparatus; in response to said control signal in said first state, detecting a predetermined bit pattern in a received second bit pattern signal; and changing the state of said control signal from said first state to said second state.
Claim 14
Independent Claim
172 words
A method of operating a digital data communication apparatus comprising the steps of sending binary data information scrambled into a first bit pattern signal over a facility, in response to a first state of a mode control signal, and sending binary control information scrambled into a second bit pattern signal over said facility, in response to a second state of said control signal; descrambling a first bit pattern signal received over said facility into a first information signal; descrambling a second bit pattern signal received over said facility into a second information signal; in response to said first state of said control signal, selecting said first information signal for output from said apparatus and, in response to said second state of said control signal, selecting said second information signal for output from said apparatus; in response to said control signal in said first state, detecting a predetermined bit pattern in a received second bit pattern signal; and changing the state of said control signal from said first state to said second state.
Claim 15
Independent Claim
124 words
A method of operating a receiver apparatus of a communication system comprising the steps of descrambling a first bit pattern signal received over a facility into a first information signal; descrambling a second bit pattern signal received over said facility into a second information signal; in response to said first state of said control signal, selecting said first information signal for output from said apparatus and, in response to said second state of said control signal, selecting said second information signal for output from said apparatus; in response to said control signal in said first state, detecting a predetermined bit pattern in a received second bit pattern signal; and changing the state of said control signal from said first state to said second state.
Claim 16
Independent Claim
124 words
A method of operating a receiver apparatus of a communication system comprising the steps of descrambling a first bit pattern signal received over a facility into a first information signal; descrambling a second bit pattern signal received over said facility into a second information signal; in response to said first state of said control signal, selecting said first information signal for output from said apparatus and, in response to said second state of said control signal, selecting said second information signal for output from said apparatus; in response to said control signal in said first state, detecting a predetermined bit pattern in a received second bit pattern signal; and changing the state of said control signal from said first state to said second state.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-11-28 | 1998-05-30 | 1998-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-28 | 2002-05-30 | 2002-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-28 | 2006-05-30 | 2006-11-29 | $7700.00 | Window Closed / Lapsed |