Does the switch have PoE power supply

Yes, a PoE switch contains a built-in power supply that converts AC power to DC and delivers it to connected devices over Ethernet cables.How PoE Switches Supply PowerA PoE switch functions as a Power Sourcing Equipment (PSE), providing both data and electrical power to Powered Devices (PDs) such as IP cameras, VoIP phones, and wireless access points through standard Ethernet cables . The switch's internal power supply converts AC mains power into DC voltage, typically 48V, which is then transmitted over the Ethernet cabling to the connected devices .Power Delivery ProcessDetection: When a device is connected, the PoE switch initially sends a low voltage to detect whether the device supports PoE standards (IEEE 802.3af/at/bt) using a resistive signature .Classification: The switch measures the device's power requirements and classifies it into a power class (0–8), determining the appropriate voltage and current .Power Supply: After classification, the switch gradually ramps up the voltage to the full 48V DC, providing stable and reliable power to the device .Protection: If a device is removed, overloaded, or exceeds the switch's total power budget, the PoE switch quickly cuts off power to prevent damage .Power Delivery ModesPoE switches can deliver power in different modes:Mode A (End-Span): Power is transmitted over the same pairs used for data (pins 1-2 and 3-6).Mode B (Mid-Span): Power is transmitted over the spare pairs (pins 4-5 and 7-8).4-Pair Delivery (4PPoE): Power is delivered across all four twisted pairs, allowing higher power output .Standards and CapacityPoE switches follow standards such as IEEE 802.3af (PoE), IEEE 802.3at (PoE+), and IEEE 802.3bt (PoE++), which define the maximum power per port and total switch power budget . The switch's internal power supply must be sufficient to meet the combined power requirements of all connected devices, and some models allow external PoE adapters to supplement or offload power if needed . In summary, a PoE switch does have a built-in power supply that converts AC to DC and intelligently delivers power over Ethernet to compatible devices, eliminating the need for separate power adapters for each device .