Everyday Engineering: Understanding the Marvels of Daily Life

The Global Telecommunications Network

TV-PG
S1 • E21    Nov 11, 2015    30m
Investigate the beauty and complexity of the public switched telephone network (PSTN). Optimized for transmission of the human voice, it comprises a vast array of conventional phone lines, fiber-optic cables, microwave links, and other media. Trace its evolution to the remarkable system in use today.

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