Foundry Hardware Installation Guide for the FES, FESX, and FWSX
5 - 4 © 2008 Foundry Networks, Inc. December 2008
on FastIron X Series Compact Switches
This section describes how to manage the temperature and fan speed settings on FastIron X Series compact
switches (FESX, FESX-E, and FWSX).
Temperature Sensors
The FastIron X Series compact switches have two temperature sensors; one at the air intake, and the other at the
exhaust. The software reads the temperature sensors according to the chassis poll time, which is 60 seconds by
default.
If the temperature equals or exceeds the shutdown temperature for five minutes or for five consecutive polls of the
temperature by the software (depending on the software version running on your device), the software will either
reset and reload the software or shut down the device to prevent damage.
Compact switches with 48 ports use the exhaust-side temperature sensor against the configured or default
temperature threshold to determine at which speed the fans should operate. Depending on the temperature
readings, the system can do the following:
• Leave the fan speed as is
• Increase the fan speed
• Decrease the fan speed
• Shut down a module to prevent damage
• In software releases 02.5.00 and later, the switch will automatically reset and reload the software when the
internal temperature reaches or exceeds the shutdown level for five minutes.
Fan Speed
The fans in the 24-port FastIron X Series compact switches operate at a steady speed and do not support multiple
fan speeds.
Compact switches with 48 ports have two three-speed fans that operate at low speed, then adjust based on the
ambient temperature and configured or default temperature thresholds. Both fans operate simultaneously at the
same speed. If one fan fails, it does not affect the operation of the other fan.
The fans in the 48-port switches can operate at speeds of low, medium, and high. The system uses a fan speed
switch and a default or configured temperature threshold associated with it to determine at which speed a fan
should operate. Fan speed switches are as follows:
• slow-to-medium
• medium-to-slow
• medium-to-fast
•fast-to-medium
If desired, you can change the settings of the temperature thresholds associated with fan speeds. See “Changing
the Temperature Threshold for a Fan Speed Switch” on page 5-5.
Temperature Thresholds
FastIron X Series compact switches with 48 ports have default settings for temperature thresholds associated with
fan speed switches. Therefore, no initial configuration is necessary. If desired, you can change the settings.
NOTE: This section applies to FastIron X Series compact switches with 48 ports. It does not apply to switches
with 24 ports, since the fans in the 24-port switches operate at single speed.
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