US3823401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous data transmission network
Assignee: Data Transmission Co
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Filing: 1972-10-04
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Granted: 1974-07-09
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Expires: 1992-10-04
Abstract
Abstract Disclosed is a common carrier type network for the high speed transmission of digital data. Data channels are multiplexed for transmission over a microwave backbone trunk in a synchronous manner and subscriber interconnection is effected at an intermediate multiplex level by a time division switch matrix. Full duplex transmission is by way of two digitally modulated microwave carriers.
Inventors
- 👤 E Berg
- 👤 F Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:33
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/22; Y; Y10; Y10S; Y10S370/00; Y10S370/914
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
141 words
A data transmission network comprising a plurality of data input channels and a plurality of data output channels, a time Division switch coupled between said input and output channels for selectively interconnecting different ones of said input and output channels, a multiplexer having a low speed side and a high speed side coupled to said input channels for time division multiplexing said input channels into corresponding transmission channels, clock means coupled to said channels for synchronizing said channels, a microwave backbone trunk comprising a microwave transmitter coupled to said multiplexer, said transmitter including means for digitally modulating a microwave carrier in accordance with the output of said multiplexer, a receiver including means for demodulating said carrier, a series of microwave repeater stations coupling said transmitter to said receiver, and a demultiplexer coupling the output of said receiver to said output channels.
Claim 2
Dependent Claim
141 words
A data transmission network comprising a plurality of data input channels and a plurality of data output channels, a time Division switch coupled between said input and output channels for selectively interconnecting different ones of said input and output channels, a multiplexer having a low speed side and a high speed side coupled to said input channels for time division multiplexing said input channels into corresponding transmission channels, clock means coupled to said channels for synchronizing said channels, a microwave backbone trunk comprising a microwave transmitter coupled to said multiplexer, said transmitter including means for digitally modulating a microwave carrier in accordance with the output of said multiplexer, a receiver including means for demodulating said carrier, a series of microwave repeater stations coupling said transmitter to said receiver, and a demultiplexer coupling the output of said receiver to said output channels.
Claim 3
Dependent Claim
26 words
A transmission network according to claim 1 wherein said multiplexer, demultiplexer, transmitter and receiver are repeated to provide two-way full duplex transmission through said repeater stations.
Claim 4
Dependent Claim
19 words
A transmission network according to claim 1 wherein said output channels are coupled to a local distribution transmission system.
Claim 5
Dependent Claim
20 words
A transmission network according to claim 3 including a plurality of digital communications consoles coupled to said local distribution system.
Claim 6
Dependent Claim
48 words
A transmission network according to claim 1 wherein said clock means comprises an external clock coupled to said multiplexer, at least one clock channel coupled to the high speed side of said multiplexer, and at least one clock channel coupled to the low speed side of said multiplexer.
Claim 7
Dependent Claim
39 words
A transmission network according to claim 1 including a plurality of multiplexers forming a multiplexer hierarchy coupled between said input channels and said transmitter, the multiplexed output of each successive multiplexer in said hierarchy being at a higher rate.
Claim 8
Dependent Claim
19 words
A transmission network according to claim 6 including means for coupling said multiplexer hierarchy to said time division switch.
Claim 9
Dependent Claim
19 words
A transmission network according to claim 7 wherein said hierarchy is formed by multiplexers having three different output rates.
Claim 10
Dependent Claim
126 words
A data transmission network comprising first and second groups of digital communications consoles for use by subscribers, a first local distribution system coupled to said first group, a second local distribution system coupled to said second group, a first transmitter and receiver, a first multiplexer-demultiplexer hierarchy coupling said first local distribution system to said first transmitter and receiver, a first time division switch matrix for switching time slots between its input and output coupled to said first multiplexer-demultiplexer hierarchy, a second transmitter and receiver, a series of microwave repeaters coupling said first and second transmitters and receivers, a second multiplexer-demultiplexer hierarchy coupling said second transmitter and receiver to said second local distribtuion system, and a second time division switch matrix coupled to said second multiplexer-demultiplexer hierarchy.
Claim 11
Dependent Claim
126 words
A data transmission network comprising first and second groups of digital communications consoles for use by subscribers, a first local distribution system coupled to said first group, a second local distribution system coupled to said second group, a first transmitter and receiver, a first multiplexer-demultiplexer hierarchy coupling said first local distribution system to said first transmitter and receiver, a first time division switch matrix for switching time slots between its input and output coupled to said first multiplexer-demultiplexer hierarchy, a second transmitter and receiver, a series of microwave repeaters coupling said first and second transmitters and receivers, a second multiplexer-demultiplexer hierarchy coupling said second transmitter and receiver to said second local distribtuion system, and a second time division switch matrix coupled to said second multiplexer-demultiplexer hierarchy.
Claim 12
Dependent Claim
31 words
A transmission network according to claim 9 wherein said first transmitter and second receiver operate at a different carrier frequency from the carrier frequency of said second transmitter and first receiver.
Claim 13
Dependent Claim
41 words
A transmission network according to claim 9 wherein each of said microwave repeaters comprises a first microwave antenna for both sending and receiving in a first direction and a second microwave antenna for both sending and receiving in a second direction.
Claim 14
Dependent Claim
22 words
A transmission network according to claim 11 wherein each of said repeaters includes third and fourth microwave antennas for space diversity reception.
Claim 15
Dependent Claim
41 words
A transmission network according to claim 12 wherein each of said repeaters includes a microwave tower, said third antenna being mounted on said tower beneath said first antenna, and said fourth antenna being mounted on said tower beneath said second antenna.
Claim 16
Dependent Claim
46 words
A transmission netWork according to claim 9 wherein a plurality of the low speed ports of said first multiplexer-demultiplexer hierarchy are strapped together for higher speed customer service and a corresponding plurality of the low speed ports of said second multiplexer hierarchy are similarly strapped together.
Claim 17
Dependent Claim
35 words
A transmission network according to claim 9 including a pair of receivers coupled to at least one of said multiplexer-demultiplexer hierarchys, and an elastic store circuit coupling said pair of receivers to said one hierarchy.
Claim 18
Dependent Claim
28 words
A transmission network according to claim 15 wherein said elastic store circuit comprises an elastic store shift register coupled between each of said receivers and said one hierarchy.
Claim 19
Dependent Claim
64 words
A transmission network according to claim 9 wherein a plurality of the low speed ports of said first multiplexer-demultiplexer hierarchy are coupled in parallel to one of the digital communications consoles of said first group and a corresponding plurality of the low speed ports of said second multiplexer-demultiplexer hierarchy are coupled in parallel to one of the digital communications consoles of said second group.
Claim 20
Dependent Claim
110 words
A data transmission network comprising a digital backbone trunk of microwave repeaters forming a string of microwave communication links extending substantially across the continental United States, a plurality of switching stations coupled to said trunk and controlling the flow of communication traffic through said trunk, each of said stations including a time division switch matrix for switching time slots between its input and its output, a combination multiplexer-demultiplexer coupled to said backbone trunk at each of said stations, a local distribution system coupled to said multiplexer-demultiplexer at each of said stations, and a plurality of subscriber digital communications consoles coupled to said local distribution system at each of said stations.
Claim 21
Dependent Claim
110 words
A data transmission network comprising a digital backbone trunk of microwave repeaters forming a string of microwave communication links extending substantially across the continental United States, a plurality of switching stations coupled to said trunk and controlling the flow of communication traffic through said trunk, each of said stations including a time division switch matrix for switching time slots between its input and its output, a combination multiplexer-demultiplexer coupled to said backbone trunk at each of said stations, a local distribution system coupled to said multiplexer-demultiplexer at each of said stations, and a plurality of subscriber digital communications consoles coupled to said local distribution system at each of said stations.
Claim 22
Dependent Claim
38 words
A transmission network according to claim 18 wherein each said switch matrix includes first means for establishing switched communications paths through said backbone trunk and second means for establishing switched communications paths through its respective local distribution system.
Claim 23
Dependent Claim
40 words
A transmission network according to claim 18 wherein said combination multiplexer-demultiplexer comprises a first A-MUX level having a first multiplexing rate, a second B-MUX level having a second multiplexing rate and a third C-MUX level having a third multiplexing rate.
Claim 24
Dependent Claim
33 words
A transmission network according to claim 20 wherein the rate of said B-MUX level is greater than said A-MUX level, and the rate of said C-MUX level is greater than said B-MUX level.
Claim 25
Dependent Claim
39 words
A transmission network according to claim 21 in which the low speed side of said A-MUX level is coupled to said local distribution system and the high speed side of said C-MUX level is coupled to said backbone trunk.
Claim 26
Dependent Claim
26 words
A transmission network according to claim 22 in which said switch matrix is coupled between said B-MUX level and said C-MUX level of said combination multiplexer-demultiplexer.
Claim 27
Dependent Claim
45 words
A transmission network according to claim 18 wherein said switch matrix comprises an input memory and an output memory, and means coupling said memories for transferring the state of a memory location in said input memory to a different memory location in said output memory.
Claim 28
Dependent Claim
24 words
A transmission network according to claim 24 wherein said switch matrix comprises a plurality of interconnect highways for coupling said input and output memories.
Claim 29
Dependent Claim
15 words
A transmission network according to claim 25 wherein said memories are both random access memories.
Claim 30
Dependent Claim
26 words
A transmission network according to claim 25 including an input line store and an input highway store for coupling said input memory to said interconnect highway.
Claim 31
Dependent Claim
26 words
A transmission network according to claim 27 including an output highway store and an output line store for coupling said interconnect highways to said output memory.
Claim 32
Dependent Claim
19 words
A transmission Network accordng to claim 25 comprising 512 interconnect highways between said input memory and said output memory.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |