US3671865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic net participant synchronizer
Assignee: United States Department of the Navy
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Filing: 1964-12-03
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Granted: 1972-06-20
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Expires: 1984-12-03
Abstract
Abstract A digital data net communications system for a group of tactical units in which data is transmitted by each participant in turn to all of the other participants, in which participants may be added or subtracted from the net automatically and without interfering with the transmission of data between the others. One of the participants is designated the contact area commander and during his time slot automatically synchronizes the other participants'' equipment, informs the other participants of the number of participants in the net, and any changes in the number of participants in the net thereby informing all participants of the net condition without the necessity of disrupting the transmission of data between other participants.
Inventors
- 👤 Anthony D Szumila
- 👤 Joseph J Zimnoch
- 👤 John D Bechtel
- 👤 Harvey M Steinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0685
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
178 words
A digital data communication net system having a plurality of participants each sending data to the others at predetermined intervals, and one of which is selected as the commander, having means with each participant to control its transmission slot and reception slots, said means comprising: a slot counter set for the number of participants in the net; means with each participant to store manually the number of its slot; means to compare the condition of said slot counter with said manual store; means to transmit data from said participant upon condition coincidence of said slot counter with said manual store; means to start said slot counter in response to a cycle begin signal from said commander, said slot counter thereafter cycling continuously; a frame counter associated with said slot counter and capable of counting frames cyclically up to a predetermined number and sending a pulse to said slot counter once in each frame cycle; and a bit counter for counting cyclically a predetermined number of bits and sending to said frame counter a pulse once each bit cycle.
Claim 2
Dependent Claim
178 words
A digital data communication net system having a plurality of participants each sending data to the others at predetermined intervals, and one of which is selected as the commander, having means with each participant to control its transmission slot and reception slots, said means comprising: a slot counter set for the number of participants in the net; means with each participant to store manually the number of its slot; means to compare the condition of said slot counter with said manual store; means to transmit data from said participant upon condition coincidence of said slot counter with said manual store; means to start said slot counter in response to a cycle begin signal from said commander, said slot counter thereafter cycling continuously; a frame counter associated with said slot counter and capable of counting frames cyclically up to a predetermined number and sending a pulse to said slot counter once in each frame cycle; and a bit counter for counting cyclically a predetermined number of bits and sending to said frame counter a pulse once each bit cycle.
Claim 3
Dependent Claim
36 words
A digital data communication net system as recited in claim 1 wherein said means to start said slot counter comprises: means to respond to a unique code tranSmitted from said commander to start said frame counter.
Claim 4
Dependent Claim
85 words
A digital data communication net system as recited in claim 2, further comprising: a net cycle counter, a net station store register, and a net length store register associated with each participant each adapted to receive information transmitted from said commander associated with said unique code; and means to compare the contents of said slot counter with the contents of said net length store and reset said slot counter in response to coincidence between the contents of said slot counter and said net length store.
Claim 5
Dependent Claim
78 words
A digital data communication net system as recited in claim 3 wherein the commander transmits a predetermined number of cycles containing said unique code, each successive cycle containing one higher number supplied to the net cycle counter and further comprising: means associated with said net cycle counter for detecting the occurrence of a predetermined number on said net cycle counter and responsive thereto placing the contents of said net station store register on said net length store register.
Claim 6
Dependent Claim
81 words
A digital data communication net system as recited in claim 4 having means associated with each participant to alter the number of participants in the net comprising: means to receive from the commander the present number of stations in the net, the new number of stations in the net and the number of the cycle in which the commander is transmitting; and means occurring at said predetermined number to place the new number of stations in the net length store register.
Claim 7
Dependent Claim
77 words
A digital data communication net system as recited in claim 5 wherein said means to respond to said unique code comprises: means to recognize said unique code and give an output pulse a predetermined time thereafter; a sync receive counter to count a predetermined number of said output pulses and issue an output signal setting and enabling said frame counter; and means thereafter to increment said net cycle counter by one each cycle of said slot counter.
Claim 8
Dependent Claim
95 words
A digital data communication net system as recited in claim 6 further comprising: a first shift register associated with each participant to receive transmitted information one frame at a time; and means occurring at said output pulse after recognition of said unique code to place the contents of a section of said first shift register on said net cycle counter, the contents of another section of said first shift register on said number of stations store register, and the contents of a third section of said first shift register on said net length store register.
Claim 9
Dependent Claim
63 words
A digital data communication net system as recited in claim 7, further comprising: means associated with each participant to compare the contents of said net cycle counter, said number of stations store register and said net length store register with the appropriate sections of said first shift register and to inhibit and reset said sync receive counter upon non-match in said comparing means.
Claim 10
Dependent Claim
59 words
A digital data communication net system as recited in claim 8 further comprising: a second shift register associated with each participant to receive said transmitted information; means associated with said second shift register to recognize said unique code; and means associated with said bit counter to transfer the contents of said second shift register to said first shift register.
References Cited (Backward Citations)
US2986723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |