Understanding power specification of this product

[Freshman]

I have this Dock with me (https://www.dell.com/en-in/work/shop/dell-dock-wd19s-180w/apd/210-azcs/docks).


My question:

1. I want to understand what does the 180W power mean. Does it mean that the dock can give 180W power to the other ports? Or does the Dock require 180W input power for its operation? Or does this 180W will be given to USB Type-C port to support USB Power Delivery to those ports?

2. Just to understand about which USB Type-C port supports fast charging, I was experimenting
  a. If I connect, with the host module usb type-c, my mobile is fast charging. And if I connect to the USB Type-C Multifunction DisplayPort , it is also fast charging.
  b. But if I connect my mobile to the USB-C 3.1 Gen 2 port, the mobile does not fast charging.

Can someone tell why the two USB Type-C ports supports fast charging and the other usb type-c port doesn't support fast charging?

[perieanuo]

specs sheet says:

• Power Adapter 180 Watt AC with up to 130 Watts power delivery
• Up to 90 Watts power delivery to non-Dell systems

so, 180w is power brick power, he delivers max 130w to usb-c, the rest is maybe the dock itself
regarding fast charging, you gotta digs specs for docking ports AND your device (smartphone or whatever), if both are aligning for example to pd3 standard, it will work
they say the ports are different in specs see https://www.delltechnologies.com/asset/en-us/products/electronics-and-accessories/technical-support/dell-dock-wd19s-180w-data-sheet.pdf

[Phil1977]

The dock connector and the USB-port for the display are simply designed to deliver more power - either to charge a notebook or to operate a display.

The 3.1 Gen2 port probably is only intended for data storage devices and they rarely need more than 5V/2A. That may be too little for your mobile phone to quick-charge.

It would be very expensive for Dell to make all USB-ports equivalent. They just save money by tailoring the specific ports to specific functions.

[Freshman]

Thank you.

So, when you mean, "the rest is maybe the dock itself", so the remaining 50W is taken for the Dock and it uses this power for the Power Delivery in its remaining type C and type A ports is it?

[Phil1977]

Yes...

[SeanB]

Dock can use up to 180W, and can charge at up to 130W. The inner parts can use up to 50W ,though in most cases the internal power use will be much lower, as that 50W includes the 3 USB3 ports, which can deliver up to 45W theoretically, though in most cases the actual power use will be much lower, probably 20W for all USB devices and the built in video and networking. Majority of the time it will be below 180W of power use, most going into the laptopn to charge the battery, or run the actual laptop.