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Healthcare Information Technology Exam Guide for CompTIA Healthcare IT Technician and HIT Pro Certifications by Brian Gugerty, Kathleen McCormick

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From Voice to Data Networks and the Global Internet

For most of the past century, telecommunications was characterized by the emergence of special-purpose networks. First came the telegraph, which used a series of dots and dashes to communicate. Then came the voice network, which for most of the twentieth century was the truly global network. It consisted of end devices—telephones—that were attached by wire to a central office switch. Telephone systems were owned and operated by telephone companies. The voice network was engineered to transport voice conversations. Then came radio networks, which eliminated the need to run wire, made it possible to broadcast information to the masses, and made it possible to communicate with an ambulance rushing ...

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