PoE Standards Overview
PoE (802.3af): 15.4W max, 12.95W available. For IP phones, fixed APs, basic cameras. 2-pair power delivery.
PoE+ (802.3at): 30W max, 25.5W available. For dual-band APs, PTZ cameras. 2-pair, backward compatible.
PoE++ Type 3 (802.3bt): 60W max, 51W available. For small cells, conference systems. 4-pair delivery.
PoE++ Type 4 (802.3bt): 90-100W max, 71.3W available. For LED lighting, displays, laptops. 4-pair.
All standards support 100m max distance over CAT5+ cable. Our PoE switches support all standards.
For long-distance PoE, use SFP modules for fiber uplink from PoE switches.
Power Budget Calculation
Total PoE budget must support all connected devices. A 24-port PoE+ switch with 370W budget can power ~14 PoE+ cameras at full load.
Conclusion
Visit Langzhi Technology for PoE switches from 4 to 48 ports.
