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US5859872A
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High speed communications system for analog subscriber connections
Assignee: TOWNSHEND INTELLECTUAL PROPERTY LLC
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Filing: 1997-02-20
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Granted: 1999-01-12
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Expires: 2017-02-20
Abstract
Abstract A method of detecting the presence of robbed-bit signaling within the digital portion of a telephone network. A communication system includes an encoder and a decoder. The encoder has a digital connection to the digital portion of the telephone network. The digital portion of the telephone network is connected by an analog loop to the decoder. The method includes sending a predetermined pattern of PCM codewords from the encoder, through the telephone network, to the decoder. An error measurement is taken at the decoder. The presence of robbed-bit signaling is determined based upon the error measurement.
Inventors
- 👤 Brent Townshend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:32
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/0016; H04L7/002; H04L7/0029; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4917; H04L25/4927; H04L5/00; H04L5/14; H04L5/1438; H04M; H04M11/00; H04M11/06; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q2213/00; H04Q2213/13034; H04Q2213/13036; H04Q2213/1305; H04Q2213/1309; H04Q2213/13103; H04Q2213/13107; H04Q2213/13174; H04Q2213/13179; H04Q2213/13199; H04Q2213/13202; H04Q2213/13204; H04Q2213/13209; H04Q2213/13299; H04Q2213/1332; H04Q2213/13337; H04Q2213/1336; H04Q2213/13385; H04Q2213/13396
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
142 words
In a communication system that includes an encoder and a decoder, wherein the encoder has a digital connection to a digital portion of a telephone network and the digital portion of the telephone network is connected by an analog loop to the decoder, wherein the analog loop converts digital information from the network into analog voltages for transmission to the decoder, a method of detecting the presence of robbed-bit signaling within the digital portion of the telephone network comprising the steps of: sending a predetermined pattern of PCM codewords from the encoder to the digital portion of the telephone network; receiving said predetermined pattern of PCM codewords in the form of analog voltages at the decoder; determining an error measurement at the decoder in response to said received analog voltages; and determining whether robbed-bit signaling is present based upon said error measurements.
Claim 2
Dependent Claim
142 words
In a communication system that includes an encoder and a decoder, wherein the encoder has a digital connection to a digital portion of a telephone network and the digital portion of the telephone network is connected by an analog loop to the decoder, wherein the analog loop converts digital information from the network into analog voltages for transmission to the decoder, a method of detecting the presence of robbed-bit signaling within the digital portion of the telephone network comprising the steps of: sending a predetermined pattern of PCM codewords from the encoder to the digital portion of the telephone network; receiving said predetermined pattern of PCM codewords in the form of analog voltages at the decoder; determining an error measurement at the decoder in response to said received analog voltages; and determining whether robbed-bit signaling is present based upon said error measurements.
Claim 3
Dependent Claim
29 words
A method of detecting the presence of robbed-bit signaling as in claim 1 wherein the error measurement determining step includes comparing said received analog voltages to predetermined reference voltages.
Claim 4
Dependent Claim
31 words
A method of detecting the presence of robbed-bit signaling as in claim 1 wherein said predetermined pattern is partitioned into M frames, each of said M frames having N time slots.
Claim 5
Dependent Claim
30 words
A method of detecting the presence of robbed-bit signaling as in claim 3 wherein said error measurement step comprises forming N average error measurements corresponding to said N time slots.
Claim 6
Dependent Claim
29 words
A method of detecting the presence of robbed-bit signaling as in claim 4 wherein each of said N average error measurements is formed by averaging every Nth error measurement.
Claim 7
Dependent Claim
15 words
A method of detecting the presence of robbed-bit signaling as in claim 3 where N=6.
Claim 8
Dependent Claim
54 words
A method of detecting the presence of robbed-bit signaling as in claim 1 wherein said robbed-bit signaling determining step further comprises the steps of: determining if the magnitudes of said error measurements are cyclically repetitive; and when said error measurements are cyclically repetitive, determining whether said cyclically repetitive error measurements result from robbed-bit signaling.
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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) | 2002-01-11 | 2002-07-13 | 2003-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-11 | 2006-07-13 | 2007-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-11 | 2010-07-13 | 2011-01-12 | $7700.00 | Window Closed / Lapsed |