PCM channel diagnosis
First Claim
1. 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.
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Accused Products
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 μ-law level over a first frame, and a second PCM μ-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 μ-law level over a third frame. A preferred two-level probing signal is a signal having a PCM μ-law level of ±975 for a first frame, and a signal having a PCM μ-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 μ-law level of ±975 for a first frame, and a signal having a PCM μ-law level of ±1023 for a second frame, and a signal having a PCM μ-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.
58 Citations
19 Claims
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1. A method of probing the state of a telecommunications channel, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. 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.- View Dependent Claims (15, 16, 17, 18, 19)
Specification
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- Resources
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Current AssigneeSilicon Laboratories Incorporated
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Original AssigneeGeneral DataComm, Inc. (General DataComm Industries, Inc.)
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InventorsOkunev, Yuri, Goldstein, Yuri
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Primary Examiner(s)Pham, Chi H.
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Assistant Examiner(s)Bayard, Emmanuel
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Application NumberUS08/870,684Time in Patent Office501 DaysField of Search375/222, 375/240, 375/241, 375/242, 375/243, 375/286, 375/287, 370/523, 370/522, 341/120, 341/127US Class Current375/286CPC Class CodesH04L 1/241 using pseudo-errorsH04L 1/242 by comparing a transmitted ...H04L 25/4927 using levels matched to the...H04L 5/1438 Negotiation of transmission...
