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== Optical network terminals ==
[[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 [[optical fiber]] 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 [[Institute of Electrical and Electronics Engineers|IEEE]] term), is used to terminate the optical fiber 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 [[Electric battery|battery]] backup in order to maintain service in the event of a [[power outage]] or it will go in alarm mode if disconnected and customer may be notified of this.<ref name="whatont" /> These terminals are used in both [[Fiber to the x#Active optical network|active optical networks]] and [[passive optical network]]s. Typically, an ONT connects via a fiber-optic cable to an [[Optical line termination|OLT]] to complete a connection. An ONT can work in Single Family Unit/SFU mode (modem/bridge) or Home Gateway Unit/HGU mode (router). In [[passive optical network|passive optical networks]], Management is provided by the OLT via OMCI, in case of a [[GPON]] connection, and OAM in case of a EPON connection. Authentication and encryption is done via LOID for EPON and PLOAM password, GPON serial number or others for [[GPON]].
== Environmental conditions ==
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