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System Management Bus

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System Management Bus

See SMBus.

(hardware, protocol)System Management Bus - (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.

The bus carries clock, data, and instructions and is based on Philip's I2C serial bus protocol. Support for SMBus devices is provided on Windows 2000. Windows 98 does not support such devices.

The PIIX4 chipset provides SMBus functionality. Vendors using SMBus would be required to pay royalties.

SMBus website.

Software to interrogate a SMB motherboard.

SMB devices, Part 8 Kernel Mode Driver Design Guide, Win2000 DDK.


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They are also often tied into the System Management Bus (SMBus) on the node being monitored, allowing remote monitoring of on-board sensors (such as voltage, temperature, fan speed, etc.
Clustering Strategies For Web Environments by McDowell, Steven / Computer Technology Review
A microcontroller is used as the IPMI intelligence and connects to the AdvancedTCA System Management bus and the local PCI Express Bridge device.
SBS Technologies Introduces New AdvancedMC WAN I/O Module for OC-3 ... by Business Wire
A microcontroller is used as the IPMI intelligence and connects to the AdvancedTCA System Management bus and the local PCI Express Bridge device.
SBS Technologies Introduces New AdvancedMC WAN I/O Module for ATM ... by Business Wire
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