Patent ID: 6084946
Filing Date: 2000-07-04
Classification: H04M

Abstract:
A method for determining, with reference to a pre-determined impedance value and a pre-determined wire length, the capability of a twisted wire pair to propagate a digital signal, the wire pair being served by a telephone central office, the method comprising the steps of(a) measuring a first input impedance of the wire pair from the central office end at a first pre-determined frequency,(b) determining a first measured wire length of the wire pair from the first input impedance,(c) if a comparison of the first measured wire length and the pre-determined wire length is within prescribed limits, qualifying the wire pair to propagate the digital signal whenever a comparison of the first measured input impedance and the pre-determined impedance is within pre-selected limits; otherwise, continuing with step (d),(d) measuring a second input impedance of the wire pair from the central office end at a second pre-determined frequency, and(e) qualifying the wire pair to propagate the digital signal whenever a comparison of the second measured input impedance and the pre-determined impedance is within pre-selected limits.