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PoEの相性について

Last updated at Posted at 2025-03-19

■PoEとは

PoEは「Power over Ethernet」の略。
有線LANケーブルで給電ができる機能。

参考
https://www.imrcry.jp/blog/poe/414/

大きく3つに分けて
PoE(IEEE802.3af)、
PoE+(IEEE802.3at)、
PoE++(IEEE802.3bt)という規格が存在します。

■組み合わせの相性

ざっくりいうと給電側が弱いと動作しません。

   PoE PoE+ PoE++
PoE   ○ × ×
PoE+  ○ ○ ×
PoE++ ○ ○ ○

※左:PSE(給電)
 右:PD(受電)

■所感
「PoE」というワードががPoE(機能やシリーズ)を指しているのか、PoE(無印、IEEE802.3af)を指しているのかに注意すること。

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