Running Into Charging Issues with Your PoE+ to USB-C Converter or Other PoE Devices?
There’s a little known default feature in your Cisco enterprise switch that prevents you from getting the most out of your PoE+ devices, especially when using a PoE+ to USB-C converter for iPad Pro, Surface Go, Samsung Tab, and other devices.
While your Cisco 9400 or 9300 models switch is rated for PoE+ and capable of negotiating PoE+ class 4 devices, it will default to only negotiating 15.4 watts with your PoE converter unless you configure your switch for 2 event classification. Most USB-C devices, including the Surface Go and Surface Go 2, require 18 watts or more to charge properly.
In that case, you’ll know the default setting is wrong because:
1 – You’ll see the port only negotiates 15.4 watts of power
2 – Your USB-C device will either not charge properly or will begin to lose battery charge even if it shows it is charging
Configuring Your Enterprise Switch for 2 Event Classification
Fortunately, it’s a quick, well-documented setting you just need to update for the ports you’re planning to use for your PoE+ device. You can find the instructions from Cisco here:
Or just go to your switch terminal and follow these steps:
Switch# configure terminal
Switch(config)# interface gigabitethernet2/0/1
Switch(config-if)# power inline port 2-event