Fans - NETGEAR AV Series Hardware Installation Manual

Fans

The switch includes internal fans that support intelligent operation, which enables the
switch to automatically start the operation of the fans, gradually increase the speed of
the fans, and either halt PoE or block traffic if the temperature exceeds a critical level.
The fans support the following modes:
• Off . The fans are off and produce no noise. You can only manually set the fans in
Off mode (see below).
• Quiet. The fans function from 25 to 75 percent speed and can reach 100 percent
speed. Quiet mode is the default mode. At 25 percent speed, the fans produce
minimal noise. Fan noise increases at 50 percent speed and even more so at
75 percent speed. At 100 percent speed, the fans produce considerable noise.
• Cool. The fans consistently function at 100 percent speed and produce considerable
noise. In Quiet mode, the switch might automatically change back and forth between
Cool mode and Quiet mode until a temperature, PoE budget, or traffic load condition
returns within thresholds.
You can manually control the fans through either the audio-video (AV) local browser
user interface (UI) or the command-line interface (CLI). For more information about
manually controlling the fans, see the following manuals, which you can download by
visiting www.netgear.com/support/product/m4250.aspx#download:
• Audio-video user manual
• CLI reference manual
If the fans are functioning in Off mode (which you only can set manually) or in Quiet
mode, the switch automatically manages the fans and turns on the fans or gradually
increases the speed of the fans under the following conditions:
• PoE+ and PoE++ models. Either the temperature detected by the temperature
sensor exceeds its threshold or a PoE budget is exceeded.
• LED tiles model (M4250-12M2XF). Either the temperature detected by the
temperature sensor exceeds its threshold or the switch processes a full traffic load.
• Aggregation model (M4250-16XF). Either the temperature detected by the
temperature sensor exceeds its threshold or the switch processes a full traffic load.
The following table describes the thresholds and operational properties of the fans for
each model. (The temperatures in Fahrenheit are rounded down.)
Note: Because Quiet mode supports a higher use of the PoE budget or higher traffic
load than Off mode, the temperature threshold for Quiet mode is lower than for Off
mode.
Hardware Overview
AV Line of Fully Managed Switches M4250 Series
28 Hardware Installation Guide