Patent US4730311A successfully refreshed from Google Patents.
US4730311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote multiplexer for digital telephone system
Assignee: Pacific Bell Corp
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Filing: 1985-10-25
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Granted: 1988-03-08
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Expires: 2005-10-25
Abstract
Abstract A multiplexer for use in a telephone system in which a plurality of subscriber locations are connected to a central office by a single subscribe loop is described. The multiplexer unit of the invention includes a voice interfacing circuit for converting between voice encoded digital signals and analog signals for operatively connecting to at least one subscriber voice communication apparatus. Data interfacing circuits are provided for routing data encoded digital signals to at least one subscriber digital communication apparatus. A frame processor is connected to each of the voice interfacing circuits and the data interfacing circuits for assembling and disassembling frames of voice encoded digital signals and data encoded digital signals. A transceiver is connected to the frame processor for transmitting to and receiving from a central office frames of voice encoded and data encoded digital signals. A utility processor is connected to the voice interfacing circuits, the digital interfacing circuits, the frame processor, and the transceiver for controlling those elements in accordance with control and status data encoded digital signals received by the transceiver from the central office, and for producing control and status data encoded digital signals for transmission by the transceiver to the central office.
Inventors
- 👤 Gregg D. Carse
- 👤 Bernard N. Daines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:38
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06; H04M11/068; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
211 words
A multiplexer unit for installation at or near a telephone system subscriber premise for interfacing between equipment located at the subscriber premise and a central office, said multiplexer unit comprising, voice interfacing means for converting between voice encoded digital signals and analog signals for operatively connecting to at least one subscriber analog voice communication equipment, data interfacing means for routing data encoded digital signals to at least one subscriber data communication equipment, frame processing means connected to each of said voice interfacing means and said data interfacing means for assembling and disassembling digital frames each comprised of voice encoded digital signals, data encoded digital signals, and control and status encoded digital signals, transceiver means connected to said frame processing means for transmitting to and receiving from a central office via a single subscriber loop serial full duplex frames of voice encoded, data encoded, and control and status encoded digital signals, and utility processing means connected to said voice interfacing means, said data interfacing means, said frame processing means, and said transceiver means for controlling same in accordance with said control and status encoded digital signals received by said transceiver from the central office, and for producing control and status encoded digital signals for transmission by said transceiver to the central office.
Claim 2
Dependent Claim
211 words
A multiplexer unit for installation at or near a telephone system subscriber premise for interfacing between equipment located at the subscriber premise and a central office, said multiplexer unit comprising, voice interfacing means for converting between voice encoded digital signals and analog signals for operatively connecting to at least one subscriber analog voice communication equipment, data interfacing means for routing data encoded digital signals to at least one subscriber data communication equipment, frame processing means connected to each of said voice interfacing means and said data interfacing means for assembling and disassembling digital frames each comprised of voice encoded digital signals, data encoded digital signals, and control and status encoded digital signals, transceiver means connected to said frame processing means for transmitting to and receiving from a central office via a single subscriber loop serial full duplex frames of voice encoded, data encoded, and control and status encoded digital signals, and utility processing means connected to said voice interfacing means, said data interfacing means, said frame processing means, and said transceiver means for controlling same in accordance with said control and status encoded digital signals received by said transceiver from the central office, and for producing control and status encoded digital signals for transmission by said transceiver to the central office.
Claim 3
Dependent Claim
32 words
A multiplexer unit according to claim 1 wherein said utility processing means includes clock means for controlling the time of transmission of each frame of digital signals transmitted by said transceiver means.
Claim 4
Dependent Claim
53 words
A multiplexer unit according to claim 1 wherein said voice interfacing means comprises a pair of voice modules, each of said voice modules containing a hybrid circuit for separating transmitted and received voice encoded digital signals, each of said voice modules further including filter means for restricting signals to the voice frequency range.
Claim 5
Dependent Claim
33 words
A multiplexer unit according to claim 1 wherein said data interfacing means include at least one medium-speed data port and means for routing medium-speed data encoded digital signals to said medium-speed data port.
Claim 6
Dependent Claim
40 words
A multiplexer unit according to claim 4 wherein said data interfacing means include a plurality of low-speed data ports and means for separating and routing respective low speed data encoded digital signals to respective ones of said low-speed data ports.
Claim 7
Dependent Claim
49 words
A multiplexer unit according to claim 1 including first power supply means for connection to a local source of power at the subscriber premise, and second power supply means including storage battery means for operating said multiplexer unit in the event of failure of the local source of power.
Claim 8
Dependent Claim
29 words
A multiplexer unit according to claim 1 wherein said utility processing means include means for loop back testing of at least one of the components of said multiplexer unit.
References Cited (Backward Citations)
US4317962A
Cited
US4330886A
Cited
US4465904A
Cited
US4397030A
Cited
US4367548A
Cited
US4390986A
Cited
US4332980A
Cited
US4450556A
Cited
US4449218A
Cited
US4463351A
Cited
US4381427A
Cited
US4476559A
Cited
US4627047A
Cited
US4467473A
Cited
US4476558A
Cited
US4578789A
Cited
US4607364A
Cited
US4612634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |