US3652993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid polling method for digital communications network
Assignee: AT&T Inc
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Filing: 1970-07-24
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Granted: 1972-03-28
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Expires: 1990-07-24
Abstract
Abstract All of the remote stations to be rapidly polled are connected in a series loop with the control station, which transmits a rapid polling word containing several information bits followed by a marker bit. Each remote station, while retransmitting the word to the following station in the loop, advances the marker one or more bit positions and inserts its own status information in those positions. The remote stations recognize a full word by the position of the marker and ignore it. The remote stations may also be programmed to alter error checking parity bits in accordance with the alterations made in the information bits.
Inventors
- 👤 John Dewey Bridwell
- 👤 Donald Van Zelm Wadsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:01
CPC Classifications
H; H04; H04Q; H04Q9/00; H04Q9/14; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/423
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
160 words
A method for rapid polling a plurality of remote stations interconnected in a digital communications network with a control station comprising the steps of connecting said control station and said remote stations in a series loop so that each station receives from one immediately adjacent station and transmits to its other immediately adjacent station, transmitting from said control station via said series loop a multidigit polling word comprising a plurality of information digits and a marker digit, altering said polling word at each of said plurality of remote stations by advancing said marker digit a predetermined number of digit positions and inserting information into the digit positions traversed by said marker digit, transmitting the polling word thereby altered to the next station in the series loop, and receiving and decoding said rapid polling word at said control station after it has been altered successively by each of said plurality of remote stations in the course of traversing said series loop.
Claim 2
Independent Claim
160 words
A method for rapid polling a plurality of remote stations interconnected in a digital communications network with a control station comprising the steps of connecting said control station and said remote stations in a series loop so that each station receives from one immediately adjacent station and transmits to its other immediately adjacent station, transmitting from said control station via said series loop a multidigit polling word comprising a plurality of information digits and a marker digit, altering said polling word at each of said plurality of remote stations by advancing said marker digit a predetermined number of digit positions and inserting information into the digit positions traversed by said marker digit, transmitting the polling word thereby altered to the next station in the series loop, and receiving and decoding said rapid polling word at said control station after it has been altered successively by each of said plurality of remote stations in the course of traversing said series loop.
Claim 3
Dependent Claim
66 words
A method as in claim 1 including prior to the step of connecting said control station and said remote stations in a series loop, the step of sending a preliminary rapid polling command from said control station wherein said step of connecting said control station and said remote stations in a series loop is accomplished by said remote stations in response to said rapid polling command.
Claim 4
Dependent Claim
28 words
A method as in claim 1 wherein said predetermined number of digit positions traversed by said marker digit at each of said plurality of remote stations is one.
Claim 5
Dependent Claim
33 words
A method as in claim 1 wherein said predetermined number of digit positions traversed by said marker digit is different for at least two different ones of said plurality of said remote stations.
Claim 6
Dependent Claim
99 words
A method as in claim 1 including the steps of transmitting from said control station after said marker digit a multidigit parity sequence related to said polling word by a linear code, altering said parity sequence at each of said plurality of remote stations, the parity sequence alteration being related by said linear code to the polling word alteration applied by said each remote station, and comparing at said control station a new parity sequence related by said linear code to said altered polling word after it has traversed said loop with said altered parity sequence to detect errors.
Claim 7
Independent Claim
192 words
A method for rapid polling selected ones of a plurality of remote stations interconnected in a digital communications network with a control station comprising the steps of said control station transmitting to each of said plurality of remote stations a preliminary rapid polling command, said selected ones of said plurality of remote stations connecting themselves into a series loop with said control station in response to said rapid polling command, said control station transmitting via said series loop a multidigit polling word comprising a plurality of information digits and a marker digit, said plurality of remote stations other than said selected ones ignoring said rapid polling word, each of said selected ones of said preselected remote stations in succession receiving said polling word, altering said polling word by advancing said marker digit a predetermined number of digit positions and inserting information into the digit positions traversed by said marker digit, and transmitting said altered polling word, and said control station receiving and decoding said rapid polling word after it has been altered successively by each of said selected ones of said plurality of remote stations in the course of traversing said looP.
Claim 8
Independent Claim
192 words
A method for rapid polling selected ones of a plurality of remote stations interconnected in a digital communications network with a control station comprising the steps of said control station transmitting to each of said plurality of remote stations a preliminary rapid polling command, said selected ones of said plurality of remote stations connecting themselves into a series loop with said control station in response to said rapid polling command, said control station transmitting via said series loop a multidigit polling word comprising a plurality of information digits and a marker digit, said plurality of remote stations other than said selected ones ignoring said rapid polling word, each of said selected ones of said preselected remote stations in succession receiving said polling word, altering said polling word by advancing said marker digit a predetermined number of digit positions and inserting information into the digit positions traversed by said marker digit, and transmitting said altered polling word, and said control station receiving and decoding said rapid polling word after it has been altered successively by each of said selected ones of said plurality of remote stations in the course of traversing said looP.
Claim 9
Independent Claim
98 words
A method for a remote station of a digital communication network to respond to a received polling inquiry with a minimum of network delay comprising the steps of testing in sequence each digit of said received polling inquiry for a marker digit, retransmitting after a delay of a predetermined number of digits each digit received until said marker digit is received, retransmitting said marker digit with a delay of less than said predetermined number of digits, transmitting at least one digit indicative of the response to said polling inquiry, and retransmitting each digit received after said marker digit.
Claim 10
Independent Claim
98 words
A method for a remote station of a digital communication network to respond to a received polling inquiry with a minimum of network delay comprising the steps of testing in sequence each digit of said received polling inquiry for a marker digit, retransmitting after a delay of a predetermined number of digits each digit received until said marker digit is received, retransmitting said marker digit with a delay of less than said predetermined number of digits, transmitting at least one digit indicative of the response to said polling inquiry, and retransmitting each digit received after said marker digit.
Claim 11
Dependent Claim
91 words
A method as in claim 7 including before the step of testing each digit of said received polling inquiry for a marker digit, the steps of testing each received word for a rapid polling command, upon recognizing said rapid polling command, switching into a series loop configuration, changing into a retransmit mode so that each digit received is retransmitted after a delay of said predetermined number of digits, testing each received digit for a start digit, and upon finding a start digit testing the following received digit for a control digit.
Claim 12
Dependent Claim
48 words
A method as in claim 8 including the steps of upon finding the said marker digit immediately following the said control digit of retransmitting the said received polling inquiry without alteration, and repeating the steps of claim 8 that follow the step of changing to a retransmit mode.
Claim 13
Dependent Claim
44 words
A method as in claim 8 including the step of upon finding the said marker digit in the position a second predetermined number of digits after the said control digit generating and transmitting an additional rapid polling word after retransmitting said last received digit.
References Cited (Backward Citations)
US3483329A
Cited
US3526877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |