Patent US2681787A successfully refreshed from Google Patents.
Patent US5825823A successfully refreshed from Google Patents.
US5825823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
PCM channel diagnosis
Assignee: Silicon Laboratories Inc
•
Filing: 1997-06-06
•
Granted: 1998-10-20
•
Expires: 2017-06-06
Abstract
Abstract A two-level or three-level probing signal is generated by a transmitter for transmission over a channel and for detection and analysis by a receiver. The two-level probing signal is a signal having a first PCM mu -law level over a first frame, and a second PCM mu -law level over a second frame. The two-level probing signal when combined with detection and analysis is generally sufficient for determining the presence and order of RB-signaling and PAD attenuation, and the extent of PAD attenuation may also be determined. The three-level probing signal is similar to the two-level probing signal but includes a third mu -law level over a third frame. A preferred two-level probing signal is a signal having a PCM mu -law level of +/-975 for a first frame, and a signal having a PCM mu -law level of +/-1023 for a second frame (or vice versa), although other sets of signals such as +/-1087 and +/-879 can be utilized. One preferred three-level probing signal is a signal having a PCM mu -law level of +/-975 for a first frame, and a signal having a PCM mu -law level of +/-1023 for a second frame, and a signal having a PCM mu -law level of +/-1151 for a third frame, although other sets of signals (e.g., 911, 943, and 1151; 943, 975 and 1151; 911, 975, and 1151) can be utilized. At the receiver, the received signals are compared to a set of predetermined threshold values, and based on those comparisons, decisions as to the presence and order of RB-signaling and PAD attenuation are made.
Inventors
- 👤 Yuri Goldstein
- 👤 Yuri Okunev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:13
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4917; H04L25/4927; H04L1/00; H04L1/24; H04L1/241; H04L1/242; H04L5/00; H04L5/14; H04L5/1438
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
94 words
A method of probing the state of a telecommunications channel, comprising: a) generating at a transmitter a two-level or three-level probing signal, said two-level or three-level probing signal having a first μ-law level over a first frame and a second μ-law level over a second frame; b) detecting at a receiver the two-level or three-level probing signal; and c) determining at the receiver the presence and order of RB-signaling and PAD attenuation, and the amount of PAD attenuation by comparing indications of transforms of the detected probing signals to a plurality of threshold values.
Claim 2
Independent Claim
94 words
A method of probing the state of a telecommunications channel, comprising: a) generating at a transmitter a two-level or three-level probing signal, said two-level or three-level probing signal having a first μ-law level over a first frame and a second μ-law level over a second frame; b) detecting at a receiver the two-level or three-level probing signal; and c) determining at the receiver the presence and order of RB-signaling and PAD attenuation, and the amount of PAD attenuation by comparing indications of transforms of the detected probing signals to a plurality of threshold values.
Claim 3
Dependent Claim
37 words
A method according to claim 1, wherein: said two-level probing signal has a first PCM μ-law level over a first frame of six symbols, and a second PCM μ-law level over a second frame of six symbols.
Claim 4
Dependent Claim
19 words
A method according to claim 1, wherein: an average power of said two-level probing signal is approximately -12.0 dBm.
Claim 5
Dependent Claim
20 words
A method according to claim 3, wherein: said first μ-law level is ±975, and said second μ-law level is ±1023.
Claim 6
Dependent Claim
20 words
A method according to claim 3, wherein: said first μ-law level is ±879, and said second μ-law level is ±1087.
Claim 7
Dependent Claim
50 words
A method according to claim 1, wherein: said three-level probing signal has a first PCM μ-law level over a first frame of six symbols, and a second PCM μ-law level over a second frame of six symbols, and a third PCM μ-law level over a third frame of six symbols.
Claim 8
Dependent Claim
19 words
A method according to claim 1, wherein: an average power of said three-level probing signal is approximately -12.0 dBm.
Claim 9
Dependent Claim
39 words
A method according to claim 7, wherein: said three-level probing signal has a third μ-law level over a third frame, said first μ-law level is ±975, said second μ-law level is ±1023, and said third μ-law level is ±1151.
Claim 10
Dependent Claim
39 words
A method according to claim 1, wherein: said three-level probing signal has a third μ-law level over a third frame, said first μ-law level is ±1599, said second μ-law level is ±5981, and said third μ-law level is ±6239.
Claim 11
Dependent Claim
17 words
A method according to claim 1, wherein: said first frame and said second frame are adjacent frames.
Claim 12
Dependent Claim
33 words
A method according to claim 1, wherein: said determining comprises adding said indications of transforms to obtain a sum, and comparing said sum to at least one of said plurality of threshold values.
Claim 13
Dependent Claim
37 words
A method according to claim 1, wherein: said first frame and said second frame each have a predetermined number of slots, and said generating, detecting, and determining are conducted for each of said predetermined number of slots.
Claim 14
Dependent Claim
24 words
A method according to claim 1, wherein: said two-level or three-level probing signal comprises a multi-symbol pseudorandom sequence which is sent over several frames.
Claim 15
Independent Claim
107 words
An apparatus coupled to a telecommunications channel, said apparatus comprising: a) a transmitter which generates at least one of a two-level and three-level probing signal, said at least one of a two-level and three-level probing signal having a first μ-law level over a first frame and a second μ-law level over a second frame and chosen such that the presence and order of RB-signaling and PAD attenuation in the telecommunications channel, and the amount of PAD attenuation in the telecommunications channel can be determined by comparing indications of transforms of the at least one of a two-level and three-level probing signal to a plurality of threshold values.
Claim 16
Independent Claim
107 words
An apparatus coupled to a telecommunications channel, said apparatus comprising: a) a transmitter which generates at least one of a two-level and three-level probing signal, said at least one of a two-level and three-level probing signal having a first μ-law level over a first frame and a second μ-law level over a second frame and chosen such that the presence and order of RB-signaling and PAD attenuation in the telecommunications channel, and the amount of PAD attenuation in the telecommunications channel can be determined by comparing indications of transforms of the at least one of a two-level and three-level probing signal to a plurality of threshold values.
Claim 17
Dependent Claim
41 words
An apparatus according to claim 14, wherein: said transmitter generates said two-level probing signal with a first PCM μ-law level over a first frame of six symbols, and with a second PCM μ-law level over a second frame of six symbols.
Claim 18
Dependent Claim
29 words
An apparatus according to claim 14, wherein: said at least one of a two-level probing signal and a three-level probing signal has an average power of approximately -12.0 dBm.
Claim 19
Dependent Claim
34 words
An apparatus according to claim 16, wherein: said first μ-law level is ±975, and said second μ-law level is ±1023, or said first μ-law level is ±879, and said second μ-law level is ±1087.
Claim 20
Dependent Claim
91 words
An apparatus according to claim 14, wherein: said transmitter generates said three-level probing signal with a first PCM μ-law level over a first frame of six symbols, with a second PCM μ-law level over a second frame of six symbols, and with a third PCM μ-law level over a third frame, and said first μ-law level is ±975, said second μ-law level is ±1023, and said third μ-law level is ±1151, or said first μ-law level is ±1599, said second μ-law level is ±5981, and said third μ-law level is ±6239.
Claim 21
Dependent Claim
24 words
An apparatus according to claim 14, wherein: said two-level or three-level probing signal comprises a multi-symbol pseudorandom sequence which is sent over several frames.
References Cited (Backward Citations)
US4201909A
Cited
US4894823A
Cited
US4920534A
Cited
US5347576A
Cited
US5394437A
Cited
US5557638A
Cited
US5406583A
Cited
US5579369A
Cited
US5528625A
Cited
US5515426A
Cited
WO1996018261A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-10-19 | 2002-04-20 | 2002-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-10-19 | 2006-04-20 | 2006-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-10-19 | 2010-04-20 | 2010-10-20 | $7700.00 | Window Closed / Lapsed |