US4745603A
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Code sequence generator for a digital transmission line fault location system
Assignee: Nokia Bell Labs
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Filing: 1986-05-27
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Granted: 1988-05-17
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Expires: 2006-05-27
Abstract
Abstract A digital transmission line fault location signal generator includes a maximal length linear feedback shift register having m stages for generating a first pseudorandom sequence of binary signals with a period 2 m -1. The first pseudorandom sequence of binary signals is delayed by n time slots into a second pseudorandom sequence of binary signals. A circuit merges the first and second pseudorandom sequences of binary signals into a combined sequence of signals on the digital transmission line.
Inventors
- 👤 Dennis A. Shedd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:18
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/24; H04L1/242; H04L1/244
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A digital transmission line fault location signal generator including means for generating a first sequence of binary signals, the signal generator being characterized by means for delaying the first sequence of binary signals by n time slots into a second sequence of binary signals; and means for synchronously merging the first and second sequences of binary signals into a combined sequence of signals on the transmission line, each different combination of input signals producing in the combined sequence an output signal that is distinct from the output signals of the other combinations of input signals.
Claim 2
Dependent Claim
95 words
A digital transmission line fault location signal generator including means for generating a first sequence of binary signals, the signal generator being characterized by means for delaying the first sequence of binary signals by n time slots into a second sequence of binary signals; and means for synchronously merging the first and second sequences of binary signals into a combined sequence of signals on the transmission line, each different combination of input signals producing in the combined sequence an output signal that is distinct from the output signals of the other combinations of input signals.
Claim 3
Dependent Claim
30 words
A digital transmission line fault location signal generator, in accordance with claim 1, wherein the merging means converts the first and second sequences of binary signals into a four-level signal.
Claim 4
Dependent Claim
26 words
A digital transmission line fault location signal generator, in accordance with claim 1, wherein the first sequence of binary signals is a maximal length pseudorandom sequence.
Claim 5
Dependent Claim
87 words
A quaternary signal transmission line fault location signal generator comprising means for generating a first pseudorandom sequence of binary signals with a period 2 m -1, where m equals the number of stages in a maximal length shift register included within the generating means; means for delaying the first pseudorandom sequence of binary signals by n time slots into a second pseudorandom sequence of binary signals, and means for synchronously converting the first and second pseudorandom sequences of binary signals into a quasirandom sequence of quaternary signals.
Claim 6
Dependent Claim
87 words
A quaternary signal transmission line fault location signal generator comprising means for generating a first pseudorandom sequence of binary signals with a period 2 m -1, where m equals the number of stages in a maximal length shift register included within the generating means; means for delaying the first pseudorandom sequence of binary signals by n time slots into a second pseudorandom sequence of binary signals, and means for synchronously converting the first and second pseudorandom sequences of binary signals into a quasirandom sequence of quaternary signals.
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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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |