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Intel
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NetStructure
TM
ZT 7102 Chassis Management Module
Hardware Specifications
Technical Product Specification 17
2.0 Hardware Specifications
2.1 Overview
The chassis management module (CMM) is intended to operate as a chassis management building
block in a CompactPCI chassis. The CMM uses a unique backplane interface pinout and requires a
dedicated slot within the chassis.
Caution: The ZT 7102 plugs into a dedicated chassis management slot. System components will be damaged
if a standard 3U board is plugged into the chassis management slot.
Intelligent Platform Management Buses (IPMBs) are the primary management connection between
components. A unique star topology radiating from the CMMs is used to provide reliability,
flexibility and security. In some cases, direct logic is used to support non-intelligent devices and to
eliminate active components on the backplane and chassis.
The CMM provides 30 master/slave two-wire serial bus (2WSB) interfaces. The 2WSBs are
electrically equivalent to I2C*. As such, all outputs are open drain, so they are driven low and
passively pulled high. The 2WSB interfaces support multi-master operation on the bus, however
they do not support being the target of a read transaction from another master device. The 2WSB
interfaces are used by the CMM as IPMBs or non-intelligent management busses. Refer to the
individual sections for specific usage information. The 2WSB interfaces are used for:
• Up to 21 general-purpose slots (21 independent 2WSBs, 2WSB_S0 - 2SB_S20)
• Power supplies (two buses, 2WSB_PS0 and 2WSB_PS1)
• Fan trays (one bus, 2WSB_FT)
• Chassis sensors (one bus, 2WSB_CS)
• Chassis FRU modules (two independent buses, 2WSB_CF0 and 2WSB_CF1)
• Redundant CMM link (one bus for bi-directional communication, 2WSB_RCMM)