TL;DR
A PoE injector is a small adapter that adds DC power to an Ethernet cable so a single run can deliver both data and electricity to devices such as access points, IP cameras, and VoIP phones when the network switch supplies none. Standards-based units follow IEEE 802.3af at 15.4 watts, 802.3at at 30 watts, or 802.3bt up to roughly 90 watts.
What it means
A PoE injector is a small adapter that adds DC power to an Ethernet cable so a single run can deliver both data and electricity to devices such as access points, IP cameras, and VoIP phones when the network switch supplies none. Standards-based units follow IEEE 802.3af at 15.4 watts, 802.3at at 30 watts, or 802.3bt up to roughly 90 watts. Passive injectors instead push a fixed voltage with no negotiation and can damage equipment that is not matched to them.
Where it sits in the glossary
PoE injector is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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