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[[File:Tellabs ONT611 inside.jpeg|thumb|An optical network terminal mounted to the outside of a building, with the cover open]]
In fiber-to-the-premises systems, the signal is transmitted to the customer premises using [[fiber optic]] technologies. Unlike many conventional telephone technologies, this does not provide power for premises equipment, nor is it suitable for direct connection to customer equipment. An '''optical network terminal''' (ONT) is used to terminate the fiber optic line, [[multiplexing|demultiplex]] the signal into its component parts (voice [[telephone]], [[television]], and [[Internet access]]), and provide power to customer telephones. As the ONT must derive its power from the customer premises electrical supply, many ONTs have the option for a [[battery (electricity)|battery]] backup, to maintain service in the event of a [[power outage]].<ref name="whatont" />
== Environmental conditions ==
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