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전신

전신(電信, 영어: electrical telegraph)은 전기 신호를 이용하여 송신할 내용을 보내는 통신 방법 중의 하나다. 우편보다 빠르게 보낼 수 있다는 장점을 가지고 있다. 주로 이용하는 방법으로는 모스 부호를 이용하는 방법, 텔레타이프 단말을 이용한 기계 전신 등이 있다. 전보도 원래 전신 기술을 이용해 행해진 통신 서비스였다.

기계 전신은 디지털 통신 기술의 발달에 따라 여러 가지 정보를 송수신하는 데이터 통신으로 발전했지만, 이것들은 보통 전신이라고 하지 않는다.

전신 부호

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전신
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