A heavily trafficked connection between a carrier's POPs is known as a backbone.

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A backbone in telecommunications refers to the principal data routes between large, strategically interconnected networks and core routers on the Internet. These heavily trafficked connections facilitate the exchange of data across vast distances, often between a carrier's Points of Presence (POPs), making them essential for the global flow of information.

A Heavily Trafficked Connection Between a Carrier's POPs Is Known