Two Eras in Today’s Backbone The revolution is over. Optical transport has arrived, heralding a new era of high-speed wide-area communications. In most of the developed world fiber has long since replaced copper as the blazing core of today’s network. Yet in regions beyond the core, twisted pairs (North America) and coaxial cables (elsewhere) reliably carry their loads like pack animals from a bygone era. And not only do these proven legacy infra

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