4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal receiver

Chieh-Wen Tsai

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CPE alert signal tone detector

Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate

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Detection of ending of fax/modem communication between a...

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via frequency channels
Reexamination Certificate

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V.8bis suppression method and apparatus for modem relay

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2501960

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