Question USB Chargers - Why Ports Color Coded

[RhoXS]

I understand the color codes for USB data ports define the data transfer rates (e.g. USB 1.0/2,0/3.2/etc.). However, data transfer rate does not apply to a USB charger as it just provides a DC charging current. So, why are the USB ports on a USB charger color coded and frequently are some combination of green/blue/orange/red on the same charger?

 

[Tech Junky]

Different outputs. Different protocols.

 

[RhoXS]

Different outputs. Different protocols.

Thanks. Virtually all the color code info I could find refers to data transfer rates and that is very well defined. I could find none that defines the different charging "protocols" for a charger. Since almost all the multi port chargers use color coded ports, it would be useful to know what the color codes mean with respect to chargers.

 

[Tech Junky]

There's not a specification for them, it's mostly pavlovian to see the color amd know which device uses that preferred port for maximum charge.

The issue is there's way more protocols in use than makes sense to color code.

https://www.digitaltrends.com/mobile/how-does-fast-charging-work/