System and circuitry for measuring echoes on subscriber loops
AssigneeTelcordia Technologies, Inc.
InventorsThomas C. Banwell, Stefano Galli
Life of this patent
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Abstract
A system for performing broadband differential time domain measurement on a subscriber loop. The system comprises a waveform generator coupled to a sampling head. The sampling head includes positive and negative pulse generators each coupled to one of the lines of the subscriber loop. The subscriber lines are in turn also coupled to two inputs of a differential amplifier, whose output is connected to an oscilloscope or other detector.
Claims15
A system for performing broadband differential time domain measurement on a subscriber loop having access terminals, said system comprising:
- a waveform generator having an output;
- a detector having an input;
- and
- a DC coupled sampling head comprising
- a buffer amplifier having an input and first and second outputs, said buffer amplifier input coupled to said waveform generator output;
- a positive pulse generator coupled to said buffer amplifier first output and to one of said loop access terminals, said positive pulse generator comprising an inverter in series with a resistor, said positive pulse generator being coupled to said buffer amplifier first output, and said positive pulse generator resistor coupled to one of said access terminals;
- a negative pulse generator coupled to said buffer amplifier second output and to the other of said loop access terminals;
- and
- a difference amplifier having an output and first and second inputs, said difference amplifier first input coupled to said one of said loop access terminals, said difference amplifier second input coupled to said other of said loop access terminals, and said difference amplifier output coupled to said detector input.
A sampling head for performing broadband differential time domain measurement on a subscriber loop having first and a second access terminal, said sampling head comprising:
- a buffer amplifier having an input and first and second outputs;
- a positive pulse generator coupled to said buffer amplifier first output, said positive pulse generator comprising an inverter in series with a resistor, said positive pulse generator inverter being coupled to said buffer amplifier first output;
- a negative pulse generator coupled to said buffer amplifier second output;
- and
- a difference amplifier having an output and first and second inputs, said difference amplifier first input coupled to said buffer amplifier first output, said difference amplifier second input coupled to said buffer amplifier second output.
A sampling head for performing broadband differential time domain measurement on a subscriber loop having first and second access terminals, said sampling head comprising:
- a buffer amplifier having an input and first and second outputs;
- a positive pulse generator including an inverter coupled to said buffer amplifier first output;
- a negative pulse generator including an inverter coupled to said buffer amplifier second output;
- and
- a difference amplifier having an output and first and second inputs, said difference amplifier first input coupled to said buffer amplifier first output and said difference amplifier second input coupled to said buffer amplifier second output.
Dependencies are inferred from the claim text.