Fans for the 40-port PoE+ and PoE++ models
The following table describes the thresholds and operational properties of the fans for
the 40-port PoE+ and PoE++ models. (The temperatures in Fahrenheit are rounded
down.)
Table 13. Fan operation properties for the 40-port PoE+ and PoE++ models
M4250-40G8XF-PoE++M4250-40G8XF-PoE+M4250-40G8F-PoE+Fan Mode
Off mode
Off mode is not supportedOff mode is not supported≤ 98F (37C)
≤ 122F (50C)
Temp. sensor 1 or
Temp. sensor 2
≤ 30WPoE budget
Maximum 8 Ethernet ports
active. SFP ports not
active.
Load
OffFan use
Quiet mode with fan use below 30%
< 102F (39C)
< 122F (50C)
< 95F (35C)
< 118F (48C)
< 102F (39C)
< 123F (51C)
Temp. sensor 1 or
Temp. sensor 2
≤ 320W≤ 560W≤ 340WPoE budget
Full traffic loadFull traffic loadFull traffic loadLoad
< 30%< 30%< 30%Fan use
Quiet mode with fan use from 30 – 100%
102F (39C) – 118F (48C)
122F (50C) – 132F (56C)
95F (35C) – 114F (46C)
118F (48C) – 134F (57C)
102F (39C) – 118F (48C)
123F (51C) – 134F (57C)
Temp. sensor 1 or
Temp. sensor 2
320W – 2880W with three
power supplies active.
560W – 960W340W – 480WPoE budget
Full traffic loadFull traffic loadFull traffic loadLoad
≥ 30 – 100%≥ 30 – 100%≥ 30 – 100%Fan use
Cool mode with maximum cooling
100%100%100%Fan use
Example of intelligent fan operation:
If the fans of model M4250-40G8F-PoE+ operate in Off mode and either the temperature
detected by the temperature sensor 2 exceeds 122F (50C) or the PoE budget exceeds
30W, the switch automatically places the fans in Quiet mode.
Hardware Installation Guide43Hardware Overview
AV Line of Fully Managed Switches M4250 Series
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