Fault conditions affecting high speed data services
AssigneeTeradyne, Inc.
InventorsKurt E. Schmidt, Roger Faulkner
Life of this patent
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Abstract
A method detects a fault in a subscriber line having two wires with separate input impedances. The method includes driving the subscriber line from one end with an alternating voltage, making one-ended electrical measurements on the driven liner and determining from the measurements a quantity proportional to the phase difference of the two input impedances. The method also includes identifying a fault in response to the phase difference having a signature associated with presence of a fault in the line.
Claims36
A method of detecting a fault in a subscriber line having two wires with separate input impedances, comprising:
- driving the subscriber line from one end with an alternating voltage signal;
- making one-ended electrical measurements on the driven line;
- determining from the measurements the phase difference of the two input impedances as a function of frequency;
- and
- identifying a fault by identifying a signature associated with a fault in the determined phase difference as a function of frequency.
A method of detecting a fault in a subscriber line having two wires, comprising:
- driving the two wires with an alternating voltage signal in a common mode configuration;
- measuring a phase difference between corresponding signals on the two driven wires;
- and
- reporting a fault in response to the measured phase difference having a signature as a function of frequency associated with presence of a fault on the subscriber line.
A method of determining whether a subscriber line can support a data service, comprising;
- performing one-ended electrical measurements on the line;
- calculating from the measurements the phase difference between input impedances of two wires at multiple frequencies, the wires belonging to the subscriber line;
- determining from the phase difference at multiple frequencies whether the line has a fault belonging to a set of types of faults, the set includes a split pair fault;
- and
- disqualifying the line for the data service in response to determining that the line has a fault from the set.
A method of providing digital data services, comprising:
- monitoring a plurality of subscriber lines by regularly performing one-ended electrical measurements on the lines;
- calculating from the measurements values representative of a phase difference between input impedances of tip and ring wires of the subscriber line at multiple frequencies;
- and
- determining from the values whether one of the subscriber lines has a split pair.
A data storage medium encoding a computer executable program of instructions for a method of providing digital data services, the method comprising:
- monitoring a plurality of subscriber lines by regularly commanding a measurement unit to perform one-ended electrical measurements on the lines;
- calculating from the measurements values proportional to a phase difference between input impedances of tip and ring wires of the subscriber lines;
- and
- determining from the values whether one of the subscriber lines has a split pair.
A method of providing high speed digital data services using subscriber lines in a telephone cable, comprising:
- performing one-ended electrical measurements on a plurality of subscriber lines in the telephone cable;
- calculating from the measurements a quantities indicative of a phase difference between input impedances of tip and ring wires of the subscriber lines;
- and
- determining from the quantities whether one of the subscriber lines has a split pair, thereby disqualifying those subscriber lines for providing high speed digital data services.
Dependencies are inferred from the claim text.