Step 2 Plug in the ARMC/2 Card into the Host System and Attach InternalCables, ContinuedJ5 IPMB (Intelligent Platform Management Bus)If your motherboard has an IPMB connector, you can connect a cable from J5 on theARMC/2 card to the IPMB connector on your motherboard.Pin Description1 Positive Signal2 Ground3 Negative SignalIPMB (Intelligent Platform Management Bus)The IPMI specification was developed by Intel, Dell, Hewlett-Packard, and NEC toprovide a standard interface to be used for monitoring server items such as temperature,voltage, fans, power supplies, and chassis. IPMI is comprised of three specificationsIntelligent Platform Management Interface (IPMI), Intelligent Platform Management Bus(IPMB) and Intelligent Chassis Management Bus (ICMB). The IPMI specificationdefines the interface between management software and chassis management hardware.The IPMB specification defines the internal Intelligent Platform Management Bus. TheICMB specification defines an external bus for connecting additional IPMI enabledsystems.The electrical interconnect for system management is based on the inter-IC (I2C) bus.This bus is a two wire serial interface (clock, data) driven by open-collector drivers.Devices arbitrate for the bus based on a collision detection mechanism. The I2C data andI2C clock signals are referred to as an IPMB.The IPMB connector can be used to read IPMI information from the motherboard'sSystem Management Controller. The format and definition of the IPMI information mustbe based on the IPMI v1.5 Specification.The IPMI specification was architected around the server motherboard environment. In atypical motherboard, the Management Controller connects to a variety of dumb sensorslocated on the motherboard and within the chassis. The command set contains commandstailored to this environment and are intended to handle sensors, data repositories, eventlogs and watchdog timers.Cont’dARMC/2 User’s Guide8