US4574373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital multiplex device
Assignee: Nokia Oyj
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Filing: 1983-04-29
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Granted: 1986-03-04
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Expires: 2003-04-29
Abstract
Abstract The invention relates to a digital multiplex device for branching a digital information stream. In relatively small individual telephone networks using digital transmission techniques and comprising a few intermediate stations and terminal stations, a need has arisen to branch groups having less than 30 channels. To branch such groups in a digital manner, i.e., without first decoding the signals to voice-frequency signals, a phase compensating device includes four switches, four time multiplexers, and two frame phasers and two control units for controlling the switches and time multiplexers. The device comprises two identical units, and is suitable for branching other digital information, besides data signals having a standard frame structure. Moreover, the transmission rate of the branched line may differ from that of the main line by using a rate modifier.
Inventors
- 👤 Reijo Ahola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:18
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04J; H04J3/00; H04J3/02; H04J3/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
336 words
A digital multiplex device in an apparatus for branching a synchronous time multiplexed digital information stream between first, second and third ports, each of said ports including a transmitter and receiver, the device comprising first and second selectively activated phase controlling networks, each of said networks including: first and second input terminal means and first and second output terminal means, first and second time division multiplexers, first and second switch means and a phase changer, the first multiplexer being directly connected to the first input terminal means of the respective network, the phase changer having an input directly connected to the second input terminal means of the respective network and an output directly connected to a first input of the second multiplexer of the respective network, the first switch means selectively connecting the first input terminal means of the network to the first output terminal means of the respective network or for connecting a first output of the second phase changer to the first output means of the respective network, the second switch means selectively connecting the second output terminal means to be responsive to an output of the first multiplexer of the respective network or to a second output of the second multiplexer of the respective network; first input terminal means of the first and second networks being adapted to be respectively responsive to output signals of the receivers of the first and second ports, the first output terminal means of the first and second networks being adapted to respectively supply signals to inputs of the transmitters of the first and second ports, the second input terminal means of the second network being adapted to be connected to the second output terminal means of the first network, the second input terminal means of the first network being adapted to be connected to an output of the receiver of the third port, the second output terminal means of the second network being adapted to be connected to an input of the transmitter of the third port.
Claim 2
Dependent Claim
336 words
A digital multiplex device in an apparatus for branching a synchronous time multiplexed digital information stream between first, second and third ports, each of said ports including a transmitter and receiver, the device comprising first and second selectively activated phase controlling networks, each of said networks including: first and second input terminal means and first and second output terminal means, first and second time division multiplexers, first and second switch means and a phase changer, the first multiplexer being directly connected to the first input terminal means of the respective network, the phase changer having an input directly connected to the second input terminal means of the respective network and an output directly connected to a first input of the second multiplexer of the respective network, the first switch means selectively connecting the first input terminal means of the network to the first output terminal means of the respective network or for connecting a first output of the second phase changer to the first output means of the respective network, the second switch means selectively connecting the second output terminal means to be responsive to an output of the first multiplexer of the respective network or to a second output of the second multiplexer of the respective network; first input terminal means of the first and second networks being adapted to be respectively responsive to output signals of the receivers of the first and second ports, the first output terminal means of the first and second networks being adapted to respectively supply signals to inputs of the transmitters of the first and second ports, the second input terminal means of the second network being adapted to be connected to the second output terminal means of the first network, the second input terminal means of the first network being adapted to be connected to an output of the receiver of the third port, the second output terminal means of the second network being adapted to be connected to an input of the transmitter of the third port.
Claim 3
Dependent Claim
27 words
The device of claim 1 wherein each network includes a controller for the first and second switches and the first and second multiplexers of the respective network.
Claim 4
Dependent Claim
14 words
The device of claim 2 wherein the controller includes a programmable read only memory.
Claim 5
Dependent Claim
12 words
The device of claim 2 wherein each network has the same configuration.
Claim 6
Dependent Claim
325 words
A digital multiplex apparatus for selectively branching a synchronous time multiplexed digital information stream comprising first, second and third ports, each of said ports including a transmitter and receiver, the device including first and second selectively activated phase controlling networks, each of said networks including: first and second input terminal means and first and second output terminal means, first and second time division multiplexers, first and second switch means, and a phase changer, the first multiplexer being directly connected to the first input terminal means of the respective network, the phase changer having an input directly connected to the second input terminal means of the respective network and an output directly connected to a first input of the second multiplexer of the respective network, the first switch means selectively connecting the first input terminal means of the network to the first output terminal means of the respective network or for connecting a first output of the second phase changer to the first output means of the respective network, the second switch means selectively connecting the second output terminal means to be responsive to an output of the first multiplexer of the respective network or to a second output of the second multiplexer of the respective network; first input terminal means of the first and second networks being connected to be respectively responsive to output signals of the receivers of the first and second ports, the first output terminal means of the first and second networks being connected to respectively supply signals to inputs of the transmitters of the first and second ports, the second input terminal means of the second network being connected to the second output terminal means of the first network, the second input terminal means of the first network being connected to an output of the receiver of the third port, the second output terminal means of the second network being connected to an input of the transmitter of the third port.
Claim 7
Dependent Claim
325 words
A digital multiplex apparatus for selectively branching a synchronous time multiplexed digital information stream comprising first, second and third ports, each of said ports including a transmitter and receiver, the device including first and second selectively activated phase controlling networks, each of said networks including: first and second input terminal means and first and second output terminal means, first and second time division multiplexers, first and second switch means, and a phase changer, the first multiplexer being directly connected to the first input terminal means of the respective network, the phase changer having an input directly connected to the second input terminal means of the respective network and an output directly connected to a first input of the second multiplexer of the respective network, the first switch means selectively connecting the first input terminal means of the network to the first output terminal means of the respective network or for connecting a first output of the second phase changer to the first output means of the respective network, the second switch means selectively connecting the second output terminal means to be responsive to an output of the first multiplexer of the respective network or to a second output of the second multiplexer of the respective network; first input terminal means of the first and second networks being connected to be respectively responsive to output signals of the receivers of the first and second ports, the first output terminal means of the first and second networks being connected to respectively supply signals to inputs of the transmitters of the first and second ports, the second input terminal means of the second network being connected to the second output terminal means of the first network, the second input terminal means of the first network being connected to an output of the receiver of the third port, the second output terminal means of the second network being connected to an input of the transmitter of the third port.
Claim 8
Dependent Claim
31 words
The apparatus of claim 5 further including frequency changing means connected between the second output terminal means of the second network and the input of the transmitter of the third means.
Claim 9
Dependent Claim
27 words
The apparatus of claim 5 wherein each network includes a controller for the first and second switches and the first and second multiplexers of the respective network.
Claim 10
Dependent Claim
14 words
The apparatus of claim 7 wherein the controller includes a programmable read only memory.
Claim 11
Dependent Claim
12 words
The apparatus of claim 5 wherein each network has the same configuration.
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) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |