US3624603A
Expired / Lapsed
US
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Digital data communications system with means for improving system security
Assignee: General Electric Co
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Filing: 1969-09-16
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Granted: 1971-11-30
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Expires: 1989-09-16
Abstract
Abstract For reducing the possibility that unsafe machine operation may result from distorted digital code words representing commands or conditions, a communications system in which both the machine and a central control unit include transceivers which repetitively transmit a digital word sequence consisting of a digital word and its complement. Decoder logic in the other transceiver must recognize both an acceptable digital word and the complement of that word before machine operations will be ordered or initiated.
Inventors
- 👤 William E Delcomyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:10
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/08
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
194 words
For interconnecting a source of digital code words and a remote means for utilizing those words, a digital data communications system including: a. a means connected to the source for cyclically transmitting different forms of one or more acceptable digital code words comprising; 1. timing means for repetitively generating counts in uniformly long count sequences to establish repetitive operating cycles made up of a predetermined number of sequences, 2. gating means connected to said timing means and responsive at a particular count in each sequence to provide an output signal, and 3. word permutating means connected to the source and to said gating means, said word permutating means being responsive to each of the output signals provided by said gating means to permutate the form of the word being provided by the source; and, b. means connected to the utilizing means for receiving the transmitted forms comprising; 1. decoding means for detecting each of the transmitted forms of the one or more acceptable words, and 2. gating means responsive to the concurrent detection of all of the different forms of the same word to apply a signal representing that word to the utilizing means.
Claim 2
Dependent Claim
194 words
For interconnecting a source of digital code words and a remote means for utilizing those words, a digital data communications system including: a. a means connected to the source for cyclically transmitting different forms of one or more acceptable digital code words comprising; 1. timing means for repetitively generating counts in uniformly long count sequences to establish repetitive operating cycles made up of a predetermined number of sequences, 2. gating means connected to said timing means and responsive at a particular count in each sequence to provide an output signal, and 3. word permutating means connected to the source and to said gating means, said word permutating means being responsive to each of the output signals provided by said gating means to permutate the form of the word being provided by the source; and, b. means connected to the utilizing means for receiving the transmitted forms comprising; 1. decoding means for detecting each of the transmitted forms of the one or more acceptable words, and 2. gating means responsive to the concurrent detection of all of the different forms of the same word to apply a signal representing that word to the utilizing means.
Claim 3
Dependent Claim
22 words
gating means connected to said timing means and responsive at a particular count in each sequence to provide an output signal, and
Claim 4
Dependent Claim
22 words
gating means connected to said timing means and responsive at a particular count in each sequence to provide an output signal, and
Claim 5
Dependent Claim
28 words
gating means responsive to the concurrent detection of all of the different forms of the same word to apply a signal representing that word to the utilizing means.
Claim 6
Dependent Claim
28 words
gating means responsive to the concurrent detection of all of the different forms of the same word to apply a signal representing that word to the utilizing means.
Claim 7
Dependent Claim
36 words
A digital data communications system as recited in claim 1 wherein said word permutating means comprises means for complementing each bit of the existing word form in response to an output signal from said gating means.
Claim 8
Dependent Claim
75 words
gating means responsive to the concurrent detection of all of the different forms of the same word to apply a signal representing that word to the utilizing means; c. a plurality of memory units for separately storing the different word forms transmitted by said transmitting means, d. means for steering successively received word forms to different units in said plurality; and, e. means for connecting each memory unit of said plurality to said decoding means.
Claim 9
Dependent Claim
75 words
gating means responsive to the concurrent detection of all of the different forms of the same word to apply a signal representing that word to the utilizing means; c. a plurality of memory units for separately storing the different word forms transmitted by said transmitting means, d. means for steering successively received word forms to different units in said plurality; and, e. means for connecting each memory unit of said plurality to said decoding means.
Claim 10
Dependent Claim
26 words
decoding arrays connected to the memory units in said plurality for detecting the presence of the different forms of the one or more acceptable words, and
Claim 11
Dependent Claim
26 words
decoding arrays connected to the memory units in said plurality for detecting the presence of the different forms of the one or more acceptable words, and
Claim 12
Dependent Claim
52 words
an AND-gate array connected to said decoding arrays, each of the AND gates in said array being inhibited when any one of the different forms of a particular word is detected by said decoding arrays and being fully enabled only when all of the different forms of a particular word are detected.
Claim 13
Dependent Claim
52 words
an AND-gate array connected to said decoding arrays, each of the AND gates in said array being inhibited when any one of the different forms of a particular word is detected by said decoding arrays and being fully enabled only when all of the different forms of a particular word are detected.
Claim 14
Dependent Claim
54 words
For interconnecting a source of digital code words and a remote means for utilizing those words, a digital data communications system including: a. means connected to the source for cyclically transmitting different forms of one or more acceptable digital code words; b. means connected to the utilizing means for receiving the transmitted forms comprising;
Claim 15
Dependent Claim
54 words
For interconnecting a source of digital code words and a remote means for utilizing those words, a digital data communications system including: a. means connected to the source for cyclically transmitting different forms of one or more acceptable digital code words; b. means connected to the utilizing means for receiving the transmitted forms comprising;
Claim 16
Dependent Claim
55 words
word permutating means connected to the source and to said gating means, said word permutating means being responsive to each of the output signals provided by said gating means to permutate the form of the word being provided by the source; and, b. means connected to the utilizing means for receiving the transmitted forms comprising;
Claim 17
Dependent Claim
55 words
word permutating means connected to the source and to said gating means, said word permutating means being responsive to each of the output signals provided by said gating means to permutate the form of the word being provided by the source; and, b. means connected to the utilizing means for receiving the transmitted forms comprising;
Claim 18
Dependent Claim
69 words
For interconnecting a source of digital code words and a means for utilizing those words, a digital data communications system having a transceiver connected to the source and a similar transceiver connected to the utilizing means, each of said transceivers including: a. a transmitting means for cyclically transmitting different forms of one or more acceptable digital code words; and b. a receiving means for receiving transmitted word forms comprising
Claim 19
Dependent Claim
69 words
For interconnecting a source of digital code words and a means for utilizing those words, a digital data communications system having a transceiver connected to the source and a similar transceiver connected to the utilizing means, each of said transceivers including: a. a transmitting means for cyclically transmitting different forms of one or more acceptable digital code words; and b. a receiving means for receiving transmitted word forms comprising
Claim 20
Dependent Claim
51 words
A digital data communications system as recited in claim 4 wherein said decoding arrays comprise identical arrays of AND gates connected to each one of said plurality of memory units, each of said AND gates being fully enabled only if the memory unit contains a particular form of a particular word.
Claim 21
Dependent Claim
93 words
A digital data communications system as recited in claim 5 wherein said receiving means further includes OR-gate arrays interconnecting the individual AND gates in said AND-gate array with the individual AND gates in said decoding arrays, each of said OR gates having inputs form all AND gates that detect a particular form of a particular word and an output to a single AND gate in said AND-gate array, whereby said single AND gate will be fully enabled regardless which of said plurality of memory units contains the particular form of a particular word.
Claim 22
Dependent Claim
106 words
A digital data communications system as recited in claim 4 wherein said transmitting means includes: a. timing means for repetitively generating counts in uniformly long count sequences to establish repetitive operating cycles made up of a predetermined number of sequences; b. gating means connected to said timing means and responsive at a particular count in each sequence to provide an output signal; and c. word permutating means connected to the source and to said gating means, said word permutating means being responsive to each of the output signals provided by said gating means to permutate the form of the word then being provided by the source.
Claim 23
Dependent Claim
36 words
A digital data communications system as recited in claim 7 wherein said word permutating means comprises means for complementing each bit of the existing word form in response to an output signal from said gating means.
Claim 24
Dependent Claim
51 words
A digital data communications system as recited in claim 7 wherein said decoding arrays comprise identical arrays of AND gates connected to each one of said plurality of memory units, each of said AND gates being fully enabled only if the memory unit contains a particular form of a particular word.
Claim 25
Dependent Claim
92 words
A digital data communications system as recited in claim 9 wherein said receiving means further includes OR-gate arrays interconnecting the individual AND gates in said AND-gate array with the individual AND gates in said decoding arrays, each of said OR gates having inputs from all AND gates that detect a particular form of a particular word and an output to a single AND-gate in said AND-gate array, whereby said single AND gate will be fully enabled regardless which of said plurality of memory units contains the particular form of a particular word.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |