ADTRAN NetVanta 1748F Series, Hardware Installation Manual

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ADTRAN 1748F Switch Unit Installation
61700558F1-34B Copyright © 2016 ADTRAN, Inc. 21
Rack Cooling
When mounting the switch in an enclosed rack or cabinet, be sure to check the following guidelines to prevent
overheating:
• Make sure that enough cool air can flow into the enclosure for the equipment it contains.
• Check that the rack or cabinet allows the hot air to exit the enclosure (normally from the top) without
circulating back into equipment.
• If the enclosure has sides or doors with ventilation holes, make sure they are not blocked by cables or
other obstructions.
• Route cables within the rack or cabinet to maximize the airflow.
• When possible, do not completely fill the rack or cabinet with equipment, allow some unused space
within the enclosure for better airflow.
Fan Tray Module
The fan tray module is an important part of the switch air cooling system. A fan tray module must be installed in
the switch at all times. If a fan should fail, the whole fan tray module must be replaced as soon as possible.
You must install the fan tray module in the switch that matches the airflow direction of the installed power
supply units.
Replacing the Fan Tray
The switch system is shipped with a fan tray module installed. The removable fan tray, located in the rear of the
switch, includes four fixed fans and supports fan speed control. The fan speed is dynamically controlled as a
function of temperature: the higher the internal temperature, the faster the speed of the fans. The fan tray module
does not include LED indicators.
Figure 8. Fan Tray
The switch includes plug-in power supply and fan tray modules that are installed into its
chassis. All installed modules must have a matching airflow direction. That is, all modules
must have a front-to-back (F2B) airflow direction, or all modules must have a
back-to-front (B2F) airflow direction. The airflow direction of PSUs and fan trays is
indicated by labels on the modules.
Label Indicates
Airflow Direction