1-4
EMI
All electromagnetic interference (EMI) sources, from outside or inside of the device and application
system, adversely affect the device in the following ways:
•
A conduction pattern of capacitance coupling.
•
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 system has a resistance value less than 1 ohm.
For more information about grounding the device, see "Installing the device."
Power
Perform the following tasks to meet the power requirements:
1.
Calculate the system power consumption.
The system power consumption varies by module type and density. For more information about
system power consumption calculation, see
S12500CR Switch Router Series Hardware
Information and Specifications
.
2.
Identify the number of power supplies.
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
S12500CR Switch
Router Series Hardware Information and Specifications
.
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
S12500CR Switch Router Series Hardware Information and
Specifications
.
Cooling
Plan the installation site for adequate ventilation:
•
Leave a minimum of 30 cm (11.81 in) of clearance at 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 design of the chassis meets the airflow design of the installation site.
