| 摘要 |
<p>METHOD AND APPARATUS FOR MEASURING TELEPHONE LINE A method and apparatus for deriving thirteen distinct parameters of a telephone line from current and charge flow measurements on each side of the line, taken during only three successive voltage states applied to both sides thereof through known tip and ring resistors. The derivations enable calculation of any spurious a-c voltages, d-c voltages, leakage resistances, and line capacitances between tip and ground, ring and ground, and tip and ring, as well as the frequency of the spurious a-c voltages. - i</p> |
