Patent US5163079A successfully refreshed from Google Patents.
US5163079A
Expired / Lapsed
US
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Analog/digital telephone test set
Assignee: Individual
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Filing: 1990-12-12
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Granted: 1992-11-10
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Expires: 2010-12-12
Abstract
Abstract An analog/digital telephone test set for telephone lines using dial pulse, DTMF, and digital signalling having a DTMF decoder for converting DTMF tones for application to a microprocessor which converts them, for example, to 16 bit digital commands transmitted as 8 kHz bursts.
Inventors
- 👤 Raymond C. Crowdis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:24
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/24; H04M3/00; H04M3/22; H04M3/26; H04M3/28; H04M3/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
An analog/digital lineman's telephone test set for connection to a single telephone line at a time having DTMF signalling means for signalling on analog lines, comprising: (a) DTMF decoding means for converting DTMF tones to microprocessor compatible signals; (b) microprocessor means for responding to said DTMF decoding means in a preprogrammed manner by outputting digitally encoded signals for signalling on digital telephone lines until a connection to a central office has been established through said single telephone line; (c) said microprocessor means causing said lineman's telephone test set to revert to analog operation in response to said connection to said central office; and (d) means for signalling an on-hook condition through said DTMF signalling means to cause said microprocessor to output a digitally encoded on-hook signal to said central office.
Claim 2
Dependent Claim
130 words
An analog/digital lineman's telephone test set for connection to a single telephone line at a time having DTMF signalling means for signalling on analog lines, comprising: (a) DTMF decoding means for converting DTMF tones to microprocessor compatible signals; (b) microprocessor means for responding to said DTMF decoding means in a preprogrammed manner by outputting digitally encoded signals for signalling on digital telephone lines until a connection to a central office has been established through said single telephone line; (c) said microprocessor means causing said lineman's telephone test set to revert to analog operation in response to said connection to said central office; and (d) means for signalling an on-hook condition through said DTMF signalling means to cause said microprocessor to output a digitally encoded on-hook signal to said central office.
Claim 3
Dependent Claim
36 words
The lineman's telephone test set as defined in claim 1, further comprising dial tone and ringing detectors for sensing dial tone and ringing signals on said single telephone line and causing said microprocessor to respond hereto.
Claim 4
Dependent Claim
33 words
The lineman's telephone test set as defined in claim 2, further comprising polarity indifferent power supply means for deriving power exclusively from said single telephone line to power said lineman's telephone test set.
Claim 5
Dependent Claim
31 words
The lineman's telephone test set as defined in claim 3, further comprising overvoltage protection means for disconnecting said power supply means in response to overvoltage conditions on said single telephone line.
References Cited (Backward Citations)
US4551585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-10 | 1996-05-11 | 1996-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-10 | 2000-05-11 | 2000-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-10 | 2004-05-11 | 2004-11-10 | $7700.00 | Window Closed / Lapsed |