Intel ZT 7102 manual Power Modules, Fan Modules, Chassis Sensor Connections, Redundancy

Intel® NetStructureTMZT 7102 Chassis Management Module

Hardware Specifications

2.3.2Chassis Sensor Connections

Chassis sensors are connected to the CMM via one two-wire serial bus.

2.3.3Chassis FRU Device Connections

Chassis sensors are connected to the CMM via one two-wire serial bus. The CMM provides two 2WSB interfaces for chassis FRU modules. Each chassis FRU module is on a dedicated 2WSB in order to provide redundant access to vital chassis information (e.g., the physical location of the chassis). The backplane FRU storage device used MUST be an Atmel* AT24C16 or other 24C16-compatible device.

2.3.4Redundancy

The CMM supports redundant operation with automatic failover under hardware or software control. The following hardware interfaces exist for the support of redundancy and automatic failover:

•Cross-connected CMM present inputs (PRES_I#) and outputs (PRES_O#)

•Cross-connected CMM healthy inputs (HLY_I#) and outputs (HLY_O#)

•Cross-connected negotiation inputs (NEG_I) and outputs (NEG_O)

The active CMM monitors its PRES_I# and HLY_I# inputs to determine if it has a healthy, standby CMM. The active CMM deasserts its HLY_O# output to trigger a failover to the standby CMM.

The cross-connected negotiation signals are used to assure that only one CMM is active at a time. At anytime, the standby CMM can trigger a failover by driving its NEG_O output low.

2.4Power Modules

Power supply sleds are connected to the CMM via two IPMBs. Each power supply sled connects to one IPMB. Multiple power supplies can share a single IPMB. The CMM also provides independent DEG#, FAIL#, and INH# signals as defined in PICMG* 2.11 for up to eight power supplies. The CMM will communicate with intelligent supplies via the IPMBs. Non-intelligent supplies are supported via the DEG# (degrade), FAIL# (fail), and INH# (inhibit) signals.

The CMM uses INH# rather than EN# to control the power supplies. The EN# pin is grounded on the backplane to signal to a power supply when it is fully seated in its connector.

2.5Fan Modules

Fan trays are connected to the CMM via one two-wire serial bus (2WSB). Intelligent fan trays communicate with the CMM via the IPMB. To support non-intelligent fan trays, the CMM also provides independent fan tachometer inputs for up to 16 fans, fan tray present inputs for up to four fan trays, and four fan speed outputs (four buffered copies of a single PWM). Non-intelligent fan trays are monitored and controlled via the fan tachometer inputs and the fan speed output.

Technical Product Specification 19