Setup Guide
Fans and airow
Fan installation is done as part of the factory install based on stock keeping unit (SKU) type.
The S4200-ON Series has SKUs that support the following congurations:
• AC PSU with fan airow from the I/O to the PSU—normal
• AC PSU with fan airow from the PSU to the I/O—reverse
• DC fan unit with airow from the I/O to the PSU—normal
• DC fan unit with fan airow from the PSU to the I/O—reverse
Be sure to order the fans suitable to support your site’s ventilation. Use a single type of
airow fan in your switch. Do not mix reverse and normal airows in a single switch.
For proper ventilation, position the switch in an equipment rack or cabinet with a minimum of
5 inches (12.7 cm) of clearance around the exhaust vents. The fan speed varies based on
internal temperature monitoring. The switch never intentionally turns o the fans.
Power
To connect the switch to the applicable power source, use the appropriate power cable. An
AC power cable is included with the switch.
When installing AC or DC switches, follow the requirements of the National Electrical Code
ANSI/NFPA 70, where applicable.
The switch is powered-up when the power cable is connected between the switch and the
power source.
CAUTION
: Always disconnect the power cable before you service the power supply
slots. The switch has multiple power cords. Before servicing, ensure all power cords
are disconnected.
CAUTION: On the AC switch, use the power supply cable as the main disconnect
device. Ensure that the socket-outlet is located/installed near the equipment and is
easily accessible.
NOTE: Module power is software controlled. You do not see module LEDs when the
switch powers up in ONIE.
Site preparations 9