Patent ID: 9178990
Filing Date: 2015-11-03
Classification: H04B,H04M

Abstract:
1. A method for determining whether a straight-loop departure condition exists on a loop under test, the loop connecting a customer premise equipment (CPE) modem to the central office (CO) modern in a communication system, comprising: receiving, at the CO modem or CPE modern, an un-calibrated echo signal for the loop under test using frequency domain reflectometry single-ended line testing (FDR-SELT), a geographical region associated with the loop under test, a platform type for the loop under test, and a loop length estimate of the loop under test; based on the geographical region, platform type, and loop length estimate, identifying an observation bandwidth and one or both of local maxima and local minima criteria, wherein the observation bandwidth identifies specific bins in which the un-calibrated echo signal is compared to the local maxima and local minima criteria; and determining whether the loop is not a straight loop, wherein determining whether the loop is not a straight loop comprises determining whether one or more of local maxima and local minima within the identified observation bandwidth in the un-calibrated echo signal satisfy the identified one or both local maxima and local minima criteria.