Intel® Server Board S2600CW Family TPS Intel® Server Board S2600CW Platform Management
Revision 2.4
commands. The power supply fans are treated as a system fan domain for which fan control
policies are mapped, just as for chassis system fans, with system thermal sensors (rather than
internal power supply thermal sensors) used as the input to a clamp algorithm for the power
supply fan control. This domain has both piecewise clipping curves and clamped sensors
mapped into the power supply fan domain. All the power supplies can be defined as a single
fan domain.
5.3.14.7.2 Use of Power Supply Thermal Sensors as Input to System (Chassis) Fan
Control
Some products require that the power supply internal thermal sensors be used as control
inputs to the system (chassis) fans, in the same manner as other system thermal sensors are
used for this purpose. The power supply thermal sensors are included as clamped sensors
into one or more system fan domains, which may include the power supply fan domain.
5.3.14.8 Fan Boosting due to Fan Failures
Intel® Server Systems supporting the Intel® Xeon® processor E5-2600 v3 and v4 product
families introduce additional capabilities for handling fan failure or removal as described in
this section.
Each fan failure shall be able to define a unique response from all other fan domains. An OEM
SDR table defines the response of each fan domain based on a failure of any fan, including
both system and power supply fans (for PMBus*-compliant power supplies only). This means
that if a system has six fans, there will be six different fan fail reactions.
5.3.14.9 Programmable Fan PWM Offset
The system provides a BIOS Setup option to boost the system fan speed by a programmable
positive offset or a “Max” setting. Setting the programmable offset causes the BMC to add the
offset to the fan speeds that it would otherwise be driving the fans to. The Max setting causes
the BMC to replace the domain minimum speed with alternate domain minimums that also are
programmable through SDRs.
This capability is offered to provide system administrators the option to manually configure
fans speeds in instances where the fan speed optimized for a given platform may not be
sufficient when a high end add-in is configured into the system. This enables easier usage of
the fan speed control to support Intel as well as third-party chassis and better support of
ambient temperatures higher than 35°C.
5.3.15 Power Management Bus (PMBus*)
The Power Management Bus (PMBus*) is an open standard protocol that is built upon the
SMBus* 2.0 transport. It defines a means of communicating with power conversion and other
devices using SMBus*-based commands. A system must have PMBus*-compliant power
supplies installed in order for the BMC or ME to monitor them for status and/or power
metering purposes.
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