4. Multiplex communications
  5. Wide area network
  6. Packet switching

Robert K. P. Galpin

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Digital interface between at least two subscriber line interface

Multiplex communications – Wide area network – Packet switching
Patent

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Digital interface of an integrated subscriber line interface cir

Multiplex communications – Wide area network – Packet switching
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Digitally controlled wide ranch automatic gain control

Amplifiers – With semiconductor amplifying device – Including gain control means
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Remote line test facility

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
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Termination unit with maintenance facility

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Including fault responsive disconnection of tested component
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Profile ID: LFUS-PAI-P-292810

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