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UPAMD Please consider if there are any additional characteristics of the sink or source that would need to be identifed that is possible orthagonal to the charactization bits in Edgar’s email. For a longer list of the 78 applications considered by US Department Of Energy in there 2010 report on Battery Charger and External Power Supply Applications. All do not necessarily apply and other may. http://grouper.ieee.org/groups/msc/upamd/private/US_DOE/bceps_preanalysis_app3a.pdf The current bits definitions defining the message source class under consideration are: The message sender classes are a fixed set of class elements. It would appear that more might be needed due to the non-interaction of the properties. Bit 0 = Source/Sink; 0= Source, 1= Sink; at the current time (has meaning under the specific connection and power direction) Bit 1 = Bidirectional Capability; 1=no, 0= yes capable of changing sink-source role Bit 2 = intermittent source; 1=no, 0= yes – Solar, Wind, Human etc powered where it cannot be relied upon for steady power. Bit 3 = Internal power storage 1= no, 0= yes; Can be local battery of a laptop or internal uninterruptable power source battery or a power storage device. Bit 4 = Restricted/special requirements; 1=no, 0=yes; Further information is needed to establish compatibility. Aimed at identifying possible medical or hazardous or other safety type issues that require additional coordination before use. (Perhaps an added message type for the negotiation of the special requirements?) Bit 5 = Hub or Docking station; 1=no, 0=yes; a re-distributor of power. Hierarchical priority issues? There can be many ports behind this device, or layers of ports, and how are they treated in overall power priority? Think about USB discovery process in walking the multiple layers. Requires probing secondary ports. Port address enumeration strategy required. Bit 6 = Reserved for expansion; 1=no expansion, 0= see expansion message. This is the escape clause for future expansion. This may want to be the first bit as it would redefine the others. Hubs or Docking stations need to be flagged in both directions because of the tree structure of the distribution. The hub/dock may have multiple power sources including internal storage. Respectfully; Bob Davis Chair UPAMD/P1823 bobd@xxxxxxxx 408.353.5990 desk 408.857.1273 cell bob.davis.scsi.com Skype |