Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1993-07-02
1995-07-25
Chin, Stephen
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379 2, 379 22, 379 24, 379 26, 379 30, H04M 124, H04M 308, H04M 322
Patent
active
054369533
ABSTRACT:
For obtaining a longitudinal balance of a pair of relatively long wires, a sinusoidal stimulus signal is generated by processing digital reference signals and is applied to the pair in at least two different connection profiles. Voltages at each wire are measured in each connection profile and are combined with the digital reference signals to derive drive representative values and metallic representative values of the pair of the long wire. The longitudinal balance is calculated from these representative values. The invention requires no highly balanced circuit to provide highly accurate measurements. The measurement inaccuracies and inherent unbalance of the measuring circuitry are eliminated by the use of at least two connection profiles and signal processing.
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ANSI/IEEE Std 455--1995, "IEEE Standard Test Procedure for Measuring Longitudinal Balance of Telephone Equipment Operating in the Voice Band", 1985.
Chin Stephen
Northern Telecom Limited
Shankar Vijay
LandOfFree
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