4. Telephonic communications
  5. Supervisory or control line signaling
  6. Signal reception at substation
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Unique ringing on a prime telephone

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Patent

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Use of an echo canceller for the detection of CAS signals

Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Reexamination Certificate

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