PoE injectors let you power a camera or access point over the same twisted-pair cable, with no separate socket at the device; power is the deciding factor here, since alongside plain injectors there are PoE+ and PoE++ models up to 75 W. The rest of the section is for fibre and old cable runs: SFP and SFP+ modules, media converters and Ethernet over coaxial cable carry the network to places where pulling new cable is no longer possible.
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PoE injectors let you power a camera or access point over the same twisted-pair cable, with no separate socket at the device; power is the deciding factor here, since alongside plain injectors there are PoE+ and PoE++ models up to 75 W. The rest of the section is for fibre and old cable runs: SFP and SFP+ modules, media converters and Ethernet over coaxial cable carry the network to places where pulling new cable is no longer possible.