Patent US4583122A successfully refreshed from Google Patents.
Patent US5870428A successfully refreshed from Google Patents.
US5870428A
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Method for providing remote loop back testing in a digital data system having multiple protocols
Assignee: Motorola Mobility LLC
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Filing: 1995-12-04
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Granted: 1999-02-09
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Expires: 2015-12-04
Abstract
Abstract An adaptive digital data unit (600) initiates and successfully completes a remote loop back test. The adaptive digital data unit (600) has a controller (610), a local transmitter (620), a local receiver (640) a timer (622) and a detector (634). When a remote adaptive digital data unit (600) transmits a first data sequence and a second data sequence, the local adaptive digital data unit (600) receives the second data sequence from the remote digital data unit and determines if the second data sequence matches one of two predetermined data sequences. If so, a test successful flag is generated.
Inventors
- 👤 David E. Miller
- 👤 Robert A. Barrett
- 👤 David E. Wilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:39
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/24; H04L1/242; H04L1/243; H04L1/241
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
A method of initiating and completing a remote loop back test in a digital data system having a local digital data unit connected to a remote digital data unit by way of a digital data network, the method comprising: (a) transmitting from the local digital data unit a first data sequence; (b) receiving at the local digital data unit a second data sequence from the remote digital data unit; (c) determining if the second data sequence matches one of two predetermined data sequences; and (d) generating a test successful flag if a match occurs; wherein step (c) further includes: (c1) determining for a first period of time if the second data sequence is an acknowledge sequence; and (c2) determining for a second period of time if the second data sequence is a reflected sequence.
Claim 2
Independent Claim
134 words
A method of initiating and completing a remote loop back test in a digital data system having a local digital data unit connected to a remote digital data unit by way of a digital data network, the method comprising: (a) transmitting from the local digital data unit a first data sequence; (b) receiving at the local digital data unit a second data sequence from the remote digital data unit; (c) determining if the second data sequence matches one of two predetermined data sequences; and (d) generating a test successful flag if a match occurs; wherein step (c) further includes: (c1) determining for a first period of time if the second data sequence is an acknowledge sequence; and (c2) determining for a second period of time if the second data sequence is a reflected sequence.
Claim 3
Dependent Claim
19 words
The method of claim 1, further comprising: (e) generating a test failed flag if a match does not occur.
Claim 4
Dependent Claim
26 words
The method of claim 1, wherein the acknowledge sequence is at least 1948 bits of scrambled binary ones generated by a scrambler polynomial equal to 1+X-4+X-7.
Claim 5
Dependent Claim
25 words
The method of claim 1, wherein the first data sequence is two seconds of scrambled binary zeros generated by a scrambler polynomial equal to 1+X-4+X-7.
Claim 6
Dependent Claim
22 words
The method of claim 3, wherein the reflected sequence is a scrambled binary zero sequence generated using a scrambler polynomial equal to1+X-4+X-7.
Claim 7
Dependent Claim
15 words
The method of claim 1, wherein the first period of time is approximately 1.5 seconds.
Claim 8
Dependent Claim
15 words
The method of claim 1, wherein the second period of time is approximately 2.0 seconds.
Claim 9
Dependent Claim
19 words
The method of claim 2, further comprising: (f) repeating steps (a) through (e) for a predetermined number of times.
Claim 10
Dependent Claim
13 words
The method of claim 8, wherein the predetermined number of times is two.
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) | 2002-02-08 | 2002-08-10 | 2003-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-08 | 2006-08-10 | 2007-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-08 | 2010-08-10 | 2011-02-09 | $7700.00 | Window Closed / Lapsed |