Pulse or digital communications – Multilevel
Patent
1997-06-06
1998-10-20
Pham, Chi H.
Pulse or digital communications
Multilevel
375222, 370523, H04L 2549
Patent
active
058258230
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.
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Goldstein Yuri
Okunev Yuri
Bayard Emmanuel
Gallagher Thomas A.
General Datacomm, Inc.
Gordon David P.
Jacobson David S.
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