Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of data transmission
Patent
1996-10-15
1999-02-23
Kuntz, Curtis A.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Of data transmission
379 6, 379 12, 375216, 375222, 375223, H04M 124, H04M 308, H04M 322
Patent
active
058752293
ABSTRACT:
A system and device for, and method of, detecting, characterizing, and mitigating deterministic distortion in a communication system. An exemplary communication system includes a digital adaptor for sending octets on to a backbone of a PSTN, which then sends, and potentially distorts the octets, received by a line interface. The line interface converts the octets to baseband signals received by an analog adaptor. Several mechanisms and methods are described in which the analog and digital adaptor cooperate to detect the presence of distortion, in particular, robbed bit signaling, on the communication system. The characterization may then be used to mitigate the effects of the distortion. Several receive constellations are provided, each constructed in view of the transmit constellation and in view of the manner in which the deterministic distortion will distort signals transmitted over the system. The receive constellations differ from the transmit constellation. The analog adaptor uses an appropriate receive constellation based on the type of distortion expected at a given interval. The digital adaptor may similarly include several constellation in view of the same considerations.
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Barabell Arthur J.
Eyuboglu M. Vedat
Humblet Pierre A.
Klayman Jeffrey T.
Kuntz Curtis A.
Motorola Inc.
Tieu Binh K.
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