4. Pulse or digital communications
  5. Repeaters
  6. Testing

Christopher Ludeman

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Apparatus and method for measuring loop impedance

Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate

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Apparatus and method for testing subscriber loop interface...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Reexamination Certificate

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Apparatus and method for testing subscriber loop interface...

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Reexamination Certificate

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Battery switching subscriber loop interface circuit

Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate

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Bidirectional buffered interface for crosspoint switch

Pulse or digital communications – Cable systems and components
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1243212

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