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I agree with Lee that UPAMD should also support low cost devices. A simple resistor to ground inside the device could tell the adapter what voltage it requires. More sophisticated device can still do power negotiation etc. With regards, Arjan Strijker From: upamd@xxxxxxxx [mailto:upamd@xxxxxxxx] On Behalf Of Atkinson, Lee Bob, here is a quick presentation on the method that HP uses for signaling from the adapter to the notebook. We’ve had this system in place since 2005 or 2006, and have shipped maybe close to 150million systems that use the common “HP Smart” system (including notebooks, all in one desktops, and small form-factor desktops). My suggestion is that we at least baseline a system that will allow some scalability of the communication method; at least, allow very low cost devices to connect to a UPAMD power source and work reliably even if their functionality is limited. I’m not sure that a lot of simple devices that would use UPAMD have a need for all the messages that the adapter could provide, or would be able to negotiate variable power consumption. I think we all agree, there is very little precedence for using sophisticated signaling in the common DC powered devices now in the market. Though I agree the simple methods are limited, if we can deliver a scalable solution there will be fewer reasons for the industry to not adopt UPAMD. Thanks again--Lee |