PoE++ 802.3bt: Deployment and Use Cases

PoE++ (802.3bt, 2018) extends PoE power delivery to 60W (Type 3) and 90W (Type 4) per port. It is essential in 2026 for WiFi 6E/7 APs, 4K digital signage displays, heated PTZ cameras, and edge computing. 2026 PoE++ guide: types, applications, switches, and power budgets.

PoE Evolution

• PoE 802.3af (2003): 15.4W PSE / 12.95W PD — IP phones, basic APs
• PoE+ 802.3at (2009): 30W / 25.5W — 802.11n/ac APs, HD cameras
• PoE++ Type 3 802.3bt (2018): 60W / 51W — WiFi 6 4×4 APs, PTZ cameras
• PoE++ Type 4 802.3bt (2018): 90W / 71.3W — tri-band WiFi 6E/7 APs, 4K displays

802.3bt Features

• Uses 4 pairs (all 8 conductors) vs 2 pairs for af/at
• Automatic class detection (Class 1-8)
• Reduced heat dissipation through 4-pair power delivery
• LLDP negotiation to adjust power delivery
• Backward-compatible with af/at

PoE++ Applications

• WiFi 6E APs: 45-60W (tri-band 4×4 MU-MIMO)
• WiFi 7 APs: 60-90W (tri-band 320 MHz)
• Heated outdoor PTZ cameras: 60-90W
• 4K digital signage displays: 40-90W
• Thin clients / NUCs: 30-60W
• Badge access/biometric terminals with displays: 30-60W
• Connected high-power LED lighting
• Basic smart industrial machines

PoE++ Switches in 2026

• Cisco Catalyst 9300-24UX / 9300-48UXM: UPOE+ 60-90W
• Aruba CX 6300M: Class 6 PoE (60W)
• Juniper EX4400-48MP: PoE++ 90W
• FortiSwitch-448E-FPOE: PoE+ 740W total power budget
• HPE Aruba 6100/6200/6300: PoE+/Class 6 depending on the model

Overall Switch PoE Power Budget

• 48-port PoE+ switches (802.3at): typically 740W
• 48-port Class 6 switches (60W): up to 2,880W, often 1,440W in practice
• 48-port Type 4 switches (90W): 4,320W theoretical, 2,880W in practice
• Redundant PSUs are essential: power consumption reaches 50-90% of rated capacity during peaks

Recommended Cabling

• Cat 5e: suitable for af/at up to 100m, limited for bt
• Cat 6: suitable for all PoE standards up to 100m
• Cat 6A: recommended for bt (90W) + mGig/10G
• Cat 7: excessive for PoE, useful for high frequencies
• CMP plenum-rated cabling for equipment rooms

PoE Power-Budget Sizing

• 50 WiFi 6 APs (30W each) = 1,500W
• 100 WiFi 6E APs (60W) = 6,000W (3× 48-port Class 6 switches)
• IP cameras: 200 × 13W = 2,600W
• Allow a 20-30% margin

Energy Consumption

• 48 Class 6 ports, all active: ~2,500W continuous
• At 8h/day (offices): 20 kWh/day = 7,300 kWh/year per switch
• Electricity cost: ~€1,100/year per 48-port UPOE switch
• Green IT: use PoE scheduling to reduce energy consumption

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