January 2021
Beginner
565 pages
19h 27m
English
Content preview from Fundamentals of Communications and Networking, 3rd Edition
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Evolution of WAN Technologies
The evolution of WAN technologies parallels the evolution from analog to digital communications. Service providers installed dark fiber along various rights of way to capitalize on long-term, scalable bandwidth. Buildings and residences evolved from copper to cable to optical fiber for last-mile connections. This evolution is what helped drive the cost of digital transmission down, making WAN connectivity affordable.
WAN Technologies in the 1970s
The use of the analog Public Switched Telephone Network (PSTN) and copper cabling limited WAN connectivity options in the 1970s. Modems were commonly used for WAN connectivity. A modem is a device that transmits and receives signals via tones. Modulation and demodulation ...
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