About redundant power supplies and power supply failure
A device with redundant power supplies can maintain full operation when one power supply fails.
Power supply failure can be a failure of the supply itself or the power grid connected to the power
supply.
Cooling system and fans
This section describes the fans in the devices with 6 fans.
Cooling system and fans shows the cooling fans.
FIGURE 35 Cooling Fans
1 Six cooling fans
The device cooling fans use pull configuration to move the air from the front to the back of the device.
NOTE
Brocade NetIron CES/CER-4X-RT supports the XNI-CE-2000-FAN pre-installed or as a spare. All
other models support the NI-CE-2000-FAN.
The fans in the devices include six four-speed fans that operate at low speed, medium speed,
medium-high speed, and high speed based on the ambient temperature and configured or default
temperature thresholds. All fans operate simultaneously at the same speed. If a single fan fails within
the assembly, the fan tray should be replaced. The fan tray is hot swappable and the mean time to
recover (MTTR) is one minute.
The system uses a default or configured temperature threshold associated with it to determine at
which speed the fan should operate.
About redundant power supplies and power supply failure
36 Brocade NetIron CES 2000 Series and NetIron CER 2000 Series Hardware Installation Guide
53-1003823-01
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