8
Gas Max. (mg/m
3
)
H
2
S 0.006
NH
3
0.05
Cl
2
0.01
EMI requirements
All electromagnetic interference (EMI) sources, from outside or inside of the switch and application
system, adversely affect the switch in a conduction pattern of capacitance coupling, inductance coupling,
electromagnetic wave radiation, or common impedance (including grounding system) coupling. To
prevent EMI, perform the following steps:
• Take measures against interference from the power grid.
• Do not use the switch together with the grounding equipment or lightning-prevention equipment of
power equipment, and keep the switch far away from them.
• Keep the switch far away from high-power radio launchers, radars, and equipment with high
frequency or high current.
• Use electromagnetic shielding when necessary.
Grounding requirements
Using a good grounding system to protect your switch against lightning shocks, interferences, and ESD
is essential to the operating reliability of your switch. Make sure that the resistance between the chassis
and the ground is less than 1 ohm. For more information about the grounding methods of the S7500E
series, see the chapter “Installing the switch.”
Power supply requirements
Perform the following steps to satisfy the power supply requirements of the S7500E series:
1. Calculate the total power consumption
The total power consumption of an S7500E series switch depends on card type and quantity and fan tray
power consumption. If the switch provides PoE power, the total power consumption also depends on PoE
power consumption. For more information about the total power consumption of the S7500E series, see
the chapter “Appendix A Hardware specifications.”
2. Select power modules according to the total power consumption
To ensure normal operation of the switch, make sure that the maximum output power of the power
module that supplies power to the switch is higher than the total power consumption of the switch. After
determining the total power consumption of the switch, you can select appropriate power modules
according to the total power consumption. For more information about the optional power module
models, see the chapter “Appendix B Pluggable module ordering guide.”
3. Check that the power supply system on the installation site satisfies the input requirements of the
power modules and parameters such as rated voltage.
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