
System Management Bus (SMBUS) is a serial bus protocol, used to management devices on the motherboard. These devices include temperature sensors, fan speed controllers, and SPD devices used by memory modules.
Found on
http://www.encyclo.co.uk/local/20505

System Management Bus. A two wire, 100 KHz, serial bus for interconnecting Smart Batteries which have built in intelligence, with their associated chargers or applications.
Found on
http://www.mpoweruk.com/glossary.htm

Smart Management Bus.
Found on
https://www.encyclo.co.uk/local/20850
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