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A landline was an overland communication wire, as opposed to an undersea cable, and referred to a line which traveled through a solid medium; either metal wire or optical fiber. A landline was typically used to increase the security of communications, as it can't be intercepted by a receiver without physical access to the line. The term landline was also used to describe a connection between two or more points that consisted of a dedicated physical cable, as opposed to an always-available private link that was actually implemented as a circuit in a wider switched system.

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