This tutorial-level presentation OF DIGITAL loop carrier (DLC) technology is for both nontechnical readers and the technically versed who lack network applications experience. It describes DLC technology with a focus on the primary motivations for its development. Other topics include a comparison to channel bank technology, the organization of DLC technology in North America, and a comparison of universal digital loop carrier (UDLC) and integrated digital loop carrier (IDLC) technologies. The concluding topic illustrates a functional equivalence between DLC and fiber-in-the-loop technologies. Although three generations of DLC technology have brought an abundance of features and capabilities, this paper sticks to the basics to remain instructional.
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