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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''', an [[ITU-T]] term), also known as an '''optical network unit''' ('''ONU''', an [[IEEE]] term), 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. If the device combines all these services into one it is known as an [[Integrated access device|IAD]]. As the ONT must derive its power from the customer premises electrical supply, many ONTs have the option for a [[battery (electricity)|battery]] backup in order to maintain service in the event of a [[power outage]].<ref name="whatont" /> These terminals are used in both [[active optical network]]s and [[passive optical network]]s. An ONT can work in Single Family Unit/SFU mode (modem/bridge) or Home Gateway Unit/HGU mode (router).
== Environmental conditions ==
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