Patent ID: 7623630
Filing Date: 2009-11-24
Classification: H04M

Abstract:
1. A method for double-ended line probing (DELP) on a copper telephone line having up to two bridge taps located thereon, comprising: measuring an overall channel insertion loss magnitude on the copper telephone line; generating a bridge tap error function #1 which includes the measured channel insertion loss magnitude measured in the measuring act and estimated insertion loss magnitudes of the bridge taps for all possible bridge tap gauges and lengths; estimating a gauge and length for each bridge tap that minimizes the bridge tap error function #1 generated in the generating act; deriving the insertion loss for the line with no bridge taps by dividing the overall channel insertion loss measured in the measuring act by a product of insertion loss magnitudes associated with the estimated bridge tap length and gauge estimated in the estimating act; and estimating a first approximation of a length and gauge for the line based on the insertion loss of the line with no bridge taps derived in the deriving act; thereby transforming the measured overall channel insertion, loss magnitude into physical and topological parameters of the copper telephone line, including both the estimated length and gauge of the telephone line together with estimated bridge tap length and gauge thereof.