SYSTEM AND METHOD FOR MEASURING COMMUNICATION LINE CHARACTERISTICS Russian patent published in 1998 - IPC

FIELD: communications engineering. SUBSTANCE: method and system for measuring transient or AC characteristics and steady-state or DC characteristics of cable pair use near-end test facility 3,60,202, and 300 electrically transformed to far end of cable pair 2,10,24, and 133 so that it may be considered in all respects to be on far end although it is physically on near end. Nonlinear element 1 is in its nonlinear region but when adequately excited by two or more AC signals of different frequencies 4,12,13,41,42,113, and 114, it produces additional frequencies which return from far end to near one of cable pair 2,10,24, and 133, and characteristics of the latter are modified. Characteristics of cable pair 2,10,24, and 133 can be obtained by proper selection of exciting frequencies and measurement of characteristics of additional returned frequencies 6,22,52, and 200. EFFECT: improved measurement accuracy. 45 cl, 6 dwg, 1 tbl