4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Of trunk or long line

Fred T. Chu

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Capacitance measurement-based mechanism for locating open...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Reexamination Certificate

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DSL line card echo canceler-based mechanism for locating...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of centralized switching system
Reexamination Certificate

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Echo canceler-based mechanism for performing and reporting...

Error detection/correction and fault detection/recovery – Pulse or data error handling – Transmission facility testing
Reexamination Certificate

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Echo canceler-based mechanism for performing and reporting...

Error detection/correction and fault detection/recovery – Pulse or data error handling – Transmission facility testing
Reexamination Certificate

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Echo-canceler for precoded fractionally spaced receiver...

Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2870320

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