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Locating Faults with a TDR

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Locating Faults with a TDR

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  • Author: Chris Dunford
In wireline communications, a pulse of energy is transmitted down the length of a telephony cable. When the transmitted energy pulse encounters the end of the cable or a problem area (e.g., a bridged tap or an open circuit), part or all of the energy is reflected back to the TDR measuring equipment. The TDR equipment measures the time it takes for the energy pulse to travel down the cable and reflect off of any impairment. Time is usually measured in nanoseconds (ns) or microseconds (ms). A calculation is made using the total pulse travel time and the velocity of propagation (VOP) of the cable (e.g., cable size, material, etc.)

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