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4 pair color code - PowerPoint PPT Presentation

BASIC TELECOMMUNICATIONS

BASIC TELECOMMUNICATIONS. Introduction to Telephony and POTS lines. BASIC TELECOMMUNICATIONS. The first patent for a telegraph was issued in 1840 Voice technology started with the telegraph in 1844 The basic phone was developed in 1876 By 1881 there were 54,000 phones in use.

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4 pair color code - PowerPoint PPT Presentation

BASIC TELECOMMUNICATIONS