Standard PoE Powered Switch

Standard PoE switches deliver 15.4W per port, with higher-power variants like PoE+ and PoE++ providing 30W, 60W, and up to 100W per port.

PoE Standards and Power Output

• PoE (IEEE 802.3af, Type 1): Supplies up to 15.4 watts per port, with 12.95W guaranteed at the powered device (PD). Suitable for low-power devices such as VoIP phones, basic IP cameras, and sensors .
• PoE+ (IEEE 802.3at, Type 2): Provides up to 30 watts per port, with 25W minimum at the PD, supporting devices like PTZ cameras, Wi-Fi access points, and alarm systems .
• PoE++ (IEEE 802.3bt, Type 3): Delivers up to 60 watts per port, ideal for high-power devices such as advanced cameras, small computers, and LED lighting .
• UPoE / PoE++ Type 4 (IEEE 802.3bt, Type 4): Offers up to 100 watts per port, enabling power-hungry devices like multi-radio access points, building automation systems, and remote patient monitoring devices .

Voltage and Cabling

• Standard PoE operates at 44–57V, PoE+ at 50–57V, and PoE++/UPoE at 52–57V .
• Power is transmitted over Cat5e, Cat6, or higher Ethernet cables, with 4-pair PoE (4PPoE) allowing higher wattage delivery by using all four twisted pairs .

Practical Considerations

• Power Budget: When deploying multiple devices, ensure the total wattage does not exceed the switch's power budget. Each port reserves power based on the PD's class, and inrush currents are managed to prevent overload .
• Distance Limit: Standard Ethernet cabling supports PoE up to 100 meters (328 feet), though voltage drop and heat can reduce effective power at longer distances .
• Device Compatibility: PoE switches are backward-compatible; a PoE+ switch can power standard PoE devices, but high-power devices require the appropriate PoE++ or UPoE switch . Understanding these standards helps in selecting the right PoE switch for your network, ensuring devices receive sufficient power while maintaining safety and efficiency.