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Comment by JackeJR | Hacker News Reader

The chargers that drop connection is typically because their max power budget per port depends on how many ports are used. E.g if my max power budget is 200w and I have 2 usb c pd and 2 usb A. Each usb c pd can have a max of 100w per pd3.0 specs. So if I have 2 devices plugged in to both usb c, if I need to plug a USB A device in, I need to lower at least one of the usb C to 65W.

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Even if my phone is charging & I plug in a Bluetooth headset, the Ugreen Nexode will drop & reconnect.

I think the OTAO might even allow oversubscribing, where if my monitor or laptop are only using 1/2 what they're negotiated for, it'll let another device join for some addition more. Then only drop a device & reconnect after it actually goes over 200w.

Seems weird but I love the boldness. There's so many USB trigger board systems where the ask isn't right sized, where a device just asks for 3A or 5A but ends up using far less. To me it's a courtesy to look back a bit & decide you can oversubscribe the new guy, and reconnect someone latter... maybe disurptive then. But compared to reconnecting everyone immediately, which is disruptive? Love it.

I have seen chargers that simplify the logic to drop everytime a new device is connected or disconnected to recalculate the max power per port. So these days if I am shopping for a charger say for a IP cam, I assume that each usb C takes 100w and usb A to take 22.5w and calculate what the max draw could be. If the max advertise power budget is at or above this value, then it is a fairly good indication that there will not be any dropping of connection.

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