1-4
•
Inductance coupling.
•
Electromagnetic wave radiation.
•
Common impedance (including the grounding system) coupling.
To prevent EMI, perform the following tasks:
•
If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE)
to filter interference from the power grid.
•
Keep the device far away from radio transmitting stations, radar stations, and high-frequency
devices.
•
Use electromagnetic shielding, for example, shielded interface cables, when necessary.
Grounding
Using a good grounding system to protect your device against lightning shocks, interferences, and
ESD is essential to the operating reliability of your device.
Make sure the equipment room grounding network has a resistance value less than 1 ohm.
For more information about grounding the device, see "Grounding the device."
Power
Perform the following tasks to provide power as required by the device:
1.
Calculate the system power consumption.
The system power consumption varies by module types and quantities. For more information
about the system power consumption, see "Module power consumption and system power
consumption."
2.
Identify the number of power supplies based on the system power consumption.
The total maximum output power of all power supplies must be higher than the system power
consumption. For more information about available power supplies, see "Power supplies."
3.
Verify that the power system at the installation site meets the requirements of the power
supplies, including the input method and rated input voltage. For more information about power
supply specifications, see "Power supplies."
Cooling
Plan the installation site for adequate ventilation:
•
Reserve a minimum clearance of 30 cm (11.81 in) around the inlet and outlet air vents.
•
The rack for the device has a good cooling system.
•
The installation site has a good cooling system.
•
Verify that the airflow of the chassis match that at the installation site.
