Brocade NetIron CER 2000 Series Hardware Guide (Supporting R05.6.00) - Manual (Page 33)

Brocade NetIron CES 2000 Series and NetIron CER 2000 Series Hardware Installation Guide 23
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Hardware features
1
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.