4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signalling integrity protection

Alexander F. Tulai

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Digital call progress tone detection method with programmable di

Telephonic communications – Supervisory or control line signaling – Signalling integrity protection
Patent

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Digital FSK receiver using double zero-crossing

Pulse or digital communications – Receivers – Angle modulation
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Isk receiver

Pulse or digital communications – Repeaters – Testing
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Profile ID: LFUS-PAI-P-143714

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