Artesyn ATCA-7350 Installation and Use (September 2014) - Manual (Page 94)

Functional Description
ATCA-7350 Installation and Use (6806800G59G) 94
Note: Here, BMC means IPMC.
BMC WDT Action For POST in the Advanced setting pane in the BIOS SETUP UTILITY
interface is used to enable/disable WDT in the BIOS POST phase and perform the action
after the WDT times out. BMC WDT for POST phase is enabled by default setting. BMC WDT
Time Out For POST is used to set the timeout threshold of the WDT in the BIOS POST
phase. This threshold can be set to 2, 3, 5, 8, or 15 minutes. This threshold has a default
value of 8 minutes.
3. OS LOAD phase: the time period from  to  and after  , as shown in Figure 4-5 . In the
OS LOAD phase, the "Reset WDT message" is sent by the software running in the OS of the
host processor. BMC WDT Action For OS Loader in the Advanced setting pane the BIOS
SETUP UTILITY interface is used to enable/disable WDT in the OS LOAD phase and perform
the action after the WDT times out. BMC WDT for OS LOAD phase is disabled by default
setting. BMC WDT Time Out For OS Loader is used to set the timeout threshold of the WDT
in the OS LOAD phase. This threshold can be set to 2, 3, 5, 8, or 15 minutes.
4.10.2 WDT#2
The IPMC WDT (implemented in hardware) must be strobed by the IPMC firmware. If IPMC
WDT expires, it isolates the blade from the backplane IPMB buses and resets the IPMC.
The watchdog timer is set to trigger the reset of IPMC if the WDT has not be cleared for 1.6
seconds and the IPMC strobes it once 100 milliseconds.
4.11 Power Supplies
The shelf provides blades with two redundant -48 V power inputs through the Zone1
connector; If one power input is faulty, the blades can work normally. This improves system
reliability.
The IPMC monitors whether the two -48 V power inputs are present. At the same time, the
IPMC monitors the two shortest pins on the Zone1 connector to check that if the blade is
properly inserted.
The -48 V DC power inputs supplied through the Zone1 connector are converted to the +12 V
DC voltage. Then the +12 V DC voltage can be converted to the voltages required by each
device on the ATCA-7350.