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Computing (FOLDOC) dictionary
System Management Bus
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hardware, protocol (SMBus, SMB) A simple two-wire bus used
for communication with low-bandwidth devices on a motherboard,
especially power related chips such as a laptop's rechargeable
battery subsystem (see Smart Battery Data). Other devices
might include temperature sensors and lid switches.
A device can provide manufacturer information, indicate its
model/part number, save its state for a suspend event,
report different types of errors, accept control parameters,
and return status. The SMB is generally not user configurable
or accessible.