Patent US2701778A successfully refreshed from Google Patents.
Patent US4637035A successfully refreshed from Google Patents.
US4637035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital modem for multiple telephone circuits
Assignee: Paradyne Corp
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Filing: 1984-02-16
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Granted: 1987-01-13
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Expires: 2004-02-16
Abstract
Abstract A modem for exchanging information between a plurality of remote DTE's and a plurality of local master DTE's is disclosed having multiple line interface and DTE interface circuits. Preferably a single microprocessor is used to process all the signals between the respective lines and DTE interface circuits. Furthermore the microprocessor is also used to calculate and update the operational parameters of the line interface circuits such as equalizer coefficients, A/D or D/A attenuator coefficients.
Inventors
- 👤 William L. Betts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:07
CPC Classifications
H; H04; H04L; H04L5/00; H04L27/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
191 words
A modem for exchanging data signals between a plurality of local data terminals and remote data terminals over individual data channels, each channel connecting said modem to one of said remote terminals comprising: a plurality of terminal interfacing modules for receiving binary signals from said local data terminals, each module being connected to a corresponding local data terminal; a single microprocessor means for receiving said binary signals from said terminal interfacing means, said microprocessor means being provided to convert said binary signals into corresponding time-sampled transmit digitized signals; and a plurality of line interfacing modules, each line interfacing module being connected to one of said channels, said line interfacing modules being provided for converting said transmit digitized signals to transmit analog signals for transmission over said channels; said plurality of line interfacing modules being further provided for receiving analog signals from said channels and converting them into received digitized signals; said microprocessor being programmed to adaptively equalize said received digitized signals and to convert the equalized signals into received binary signals; said plurality of terminal interfacing modules being further provided for transmitting said received binary signals to said local data terminals.
Claim 2
Dependent Claim
191 words
A modem for exchanging data signals between a plurality of local data terminals and remote data terminals over individual data channels, each channel connecting said modem to one of said remote terminals comprising: a plurality of terminal interfacing modules for receiving binary signals from said local data terminals, each module being connected to a corresponding local data terminal; a single microprocessor means for receiving said binary signals from said terminal interfacing means, said microprocessor means being provided to convert said binary signals into corresponding time-sampled transmit digitized signals; and a plurality of line interfacing modules, each line interfacing module being connected to one of said channels, said line interfacing modules being provided for converting said transmit digitized signals to transmit analog signals for transmission over said channels; said plurality of line interfacing modules being further provided for receiving analog signals from said channels and converting them into received digitized signals; said microprocessor being programmed to adaptively equalize said received digitized signals and to convert the equalized signals into received binary signals; said plurality of terminal interfacing modules being further provided for transmitting said received binary signals to said local data terminals.
Claim 3
Dependent Claim
20 words
The modem of claim 1 further comprising bussing means for transfering signals between the interfacing modules and the microprocessing means.
Claim 4
Dependent Claim
41 words
The modem of claim 2 wherein said microprocessor is programmed to obtain a set of equalizer coefficients for each of said data channels, said coefficients being obtained during a training period which preceeds data exchange on each of said data channels.
Claim 5
Dependent Claim
17 words
The modem of claim 3 wherein such microprocessor is further programmed to periodically update said equalizer coefficients.
Claim 6
Dependent Claim
14 words
The modem of claim 4 further comprising memory means for storing said equalizer coefficients.
Claim 7
Dependent Claim
27 words
The modem of claim 5 further comprising indexer means coupled to said microprocessor for directing said microprocessor to said data channels and terminals in a predetermined sequence.
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) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |