What does PSE mean in UNCLASSIFIED

Power Sending Equipment (PSE) is a device that provides power over Ethernet (PoE) to powered devices (PDs) over a standard Ethernet cable. It enables network devices such as VoIP phones, security cameras, and wireless access points to receive power through the same cable that carries data, reducing the need for separate power outlets and cables.

PSE detects PDs by monitoring the electrical characteristics of the connected cable. When it detects a PD, it applies power on the spare pairs of the Ethernet cable (pins 4, 5, 7, and 8) using one of the PoE standards, such as IEEE 802.3af or IEEE 802.3at.

PSEs can be classified into two main types:

• End-span PSE: Provides power on both ends of the Ethernet cable, using pins 1, 2, 3, and 6.
• Mid-span PSE: Inserts power into the cable mid-span, typically using a PoE injector, to provide power to devices that are not directly connected to a PoE switch.

PSE is the device that provides power, while PD is the device that receives power. PSEs are typically switches, routers, or power injectors, whereas PDs are devices such as IP phones, wireless access points, or security cameras.

Using PSE offers several benefits:

• Simplified wiring: Eliminates the need for separate power cables and outlets, reducing installation time and costs.
• Centralized power management: Allows for centralized monitoring and control of power distribution to PDs.
• Improved reliability: PoE provides a more reliable power source than traditional AC power outlets, as it is not subject to power fluctuations or outages.