Installation Guide

Observe these additional thermal recommendations for the location where you plan to install your
equipment:
• Ensure that the ventilation in the wiring closet is adequate to maintain a temperature below 50°C
(122°F).
• Install a reliable air conditioning and ventilation system.
• Keep the ventilation in the wiring closet running during non-business hours; otherwise, the
equipment can overheat.
• Maintain a storage temperature between -40°C (-40°F) and 70°C (158°F).
Table 16 summarizes the behavior of ExtremeSwitching switches when they experience high operating
temperatures.
Safeguards are built into all Extreme Networks switches and power supply units to minimize the risk of
fire.
Table 16: Thermal Shutdown and Restart Behavior
Switch Model(s) Behavior
All models When internal system temperatures exceed the thermal shutdown temperature
limit (typically about 20°C higher than normal system operating temperatures),
the system’s power supplies are turned o and the switch shuts down. The
system remains in the OFF state until the system has sucient time to cool and
the internal thermal sensor measures a temperature lower than the maximum
specified ambient temperature, at which time the system restarts automatically.
Alternately, you can restart the system by removing and then restoring all line
power to the system. The internal sensor must still measure a system temperature
that is lower than the maximum specified ambient temperature, so recovery
might not be immeadiate.
Controlling the Humidity Level
To maximize equipment life, keep operating humidity between 50% and 70% relative humidity (non-
condensing) during typical operation.
The equipment can operate between 5% and 95% relative humidity (non-condensing) for short
intervals.
Protecting Your System from ESD (Electrostatic Discharge)
Your system must be protected from static electricity or ESD. Take the following measures to ensure
optimum system performance:
• Remove materials that can cause electrostatic generation (such as synthetic resins) from the wiring
closet.
Check the appropriateness of floor mats and flooring.
• Connect metal chassis, conduit, and other metals to ground using dedicated grounding lines.
• Use electrostatically safe equipment.
If you are working with pluggable interface modules, wear an ESD-preventive wrist strap and
connect the metal end to a grounded equipment rack or other source of ground.
Site Preparation
Controlling the Humidity Level
ExtremeSwitching 5520 Series Hardware Installation Guide 39