What Is PoE? Power over Ethernet Explained
·1 min read·162 words
PoE (Power over Ethernet, 802.3af/at/bt) powers devices such as IP phones, WiFi APs, and cameras through the Ethernet cable, eliminating the need for a separate power supply. It is essential for simplifying modern cabling. There are 4 generations: af, at, bt Type 3, and bt Type 4.
Generations
- PoE 802.3af (2003): 15.4W PSE / 12.95W PD
- PoE+ 802.3at (2009): 30W / 25.5W
- PoE++ Type 3 802.3bt (2018): 60W / 51W
- PoE++ Type 4 802.3bt (2018): 90W / 71.3W
Applications
- IP phones: 6-13W
- WiFi 6 APs: 25-45W
- WiFi 6E/7 APs: 45-90W
- IP cameras: 9-13W (PTZ 25-90W)
- Digital signage displays: 40-90W
Cabling
- Cat 5e: suitable for af/at up to 100m
- Cat 6: suitable for all PoE standards up to 100m
- Cat 6A: recommended for PoE++ and mGig
Switch Power Budget
- 48 PoE+ ports: 370-740W total
- 48 Class 6 ports (60W): 1 440-2 880W
- Redundant PSU recommended
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