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What is power budget control?

April 26, 2017budget CONTROL power

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What is power budget control?

1 Answer

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10 Posted

Power budget control is specified in USB spec to limit device connections to a hub to avoid overcurrent condition. A self-powered hub can supply a maximum of 500mA to each port, while a bus-powered hub should only supply a maximum of 100mA to each port. With power budget control, devices consuming power more than 100mA will be denied connection to a bus-powered hub. And two bus-powered hubs are not allowed to be concatenated. This support is available in Solaris 10 Update 2 and OpenSolaris. It is also available in Solaris 9 with patch 115553-22 for Sparc systems or patch 115554-21 for x86 systems.