What Is the Difference Between a Juniper EX4200-48P and EX4200-48PX?

TLDR: P versions deliver 18.6 watts across all ports, while the PX versions deliver 30 watts per port.

PoE is used to support networked devices such as IP telephony, video cameras and wireless LAN access points and closed-circuit security cameras. The power needs of connected devices determine if you need regular PoE or PoE+.

The Juniper EX4200-48P delivers 18.6 watts of power across all ports. So the P simply stands for PoE. The EX4200-48-PX is a PoE+ model and delivers up to 30 watts on 48 ports. The additional power budget is useful when using multiple radio wireless access points (802.11n ) and video phones.

Be sure to use the correct power supply when choosing a -PX model. They require the power supply labeled EX-PWR2-930-AC. Luckily this PWR2 unit is supported across the other EX4200 products. Tidbit: Base models, like the EX4200-48T light the first 8 ports with 15.4 watts of PoE power.

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Here is a handy table for PoE reference.

Sources:

http://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/specifications/power-supply-ex4200.html

https://www.juniper.net/us/en/local/pdf/datasheets/1000215-en.pdf

https://en.wikipedia.org/wiki/Power_over_Ethernet