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Modern implementations may include a [[digital loop carrier]] system segment or [[fiber optic]] transmission system. The local loop may terminate at a circuit switch owned by a [[competitive local exchange carrier]] and housed in a [[point of presence]] (POP), which typically is an incumbent local exchange carrier telephone exchange. A local loop supports voice and/or data communications applications in the following ways:
* analog voice and signaling used in traditional [[Plain old
* [[Integrated Services Digital Network]] (ISDN)
* variants of [[Digital Subscriber Line]] (DSL).
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