TL;DR — four IEEE tiers hiding behind three names:
NameStdSwitchDevicePairsPoE802.3af15.4 W~12.95 W2PoE+802.3at30 W~25.5 W2PoE++ T3802.3bt60 W~51 W4PoE++ T4802.3bt~90–100 W~71.3 W4
802.3bt = 4-pair power (4PPoE) → half the current per pair → higher wattage + less heat.
48 V nominal; classes 0–8 negotiate the draw.
Type 3/4 → use Cat6/6A and connectors rated for the per-pin current. Under-rated jacks = field failures.
What's the highest PoE tier you've deployed — and did connector heat ever bite you? Full guide → [link]
Tags: #networking #hardware #poe #ethernet
Top comments (0)