4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Testing of network terminating interface, subscriber trunk...
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Maintenance termination units

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent

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Method and apparatus for fault segmentation in a telephone netwo

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent

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Method and apparatus for fault segmentation in a telephone netwo

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent

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Method and apparatus for high impedance ringer detection

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent

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Method and apparatus for mapping the terminations of large...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Reexamination Certificate

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Method and system for testing a transmission line in a non-addre

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent

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Method and system for testing subscriber circuits and wiring in

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent

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Method for measuring a load impedance

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Reexamination Certificate

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Multi-line network interface

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent

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