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Cisco Networking Simplified by Jim Doherty, Paul Della Maggiora

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Part II. Telephones and Movies on the Internet

Telephones and Movies on the Internet
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Traditional phone networks have been separate from traditional data networks. Phone calls have different needs from that of data transfer. With a phone, you expect an immediate dial tone when you take it off the hook. Hearing no dial tone indicates the network is down. When you talk, you expect the person on the other end to hear what you say in real time. Otherwise, the conversation is frustratingly incomprehensible (as when talking to someone on a cell phone in an area ...

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