POE Plus (POE+) extends the support for more emerging end devices with higher power requirements. IEEE introduced a new standard, 802.3at, to scale up to 30W power delivery. This further expands the end devices coverage to a broader range including newer devices such as IEEE 802.11n wireless access points, security surveillance cameras, and so on. Cisco Catalyst 4500E was the first Ethernet switch in the industry to introduce 30W PoE technology in 2007, two years before the IEEE 802.3at standard introduction, and later become compliant with the IEEE 802.3at standard when it was ratified in 2009.
Cisco Universal Power Over Ethernet (UPOE) extends the IEEE Power over Ethernet Plus (PoE+) standard to double the power per port to 60 watts. It can extend resilient network power to a broad range of devices, including virtual desktop terminals, IP turrets, compact switches, building management gateways, LED lights, wireless access points, and IP phones.Cisco UPOE is currently available on the Cisco Catalyst 4500E and Cisco Catalyst 3650,3850 platforms.
The above definitions are not enough to enumerate the difference between both the POE+ and UPOE standards.Below table shares the comparison view of both –