Fans for the 24-port PoE+ and PoE++ models
The following table describes the thresholds and operational properties of the fans for
the 24-port PoE+ and PoE++ models. (The temperatures in Fahrenheit are rounded
down.)
Table 11. Fan operation properties for the 24-port PoE+ and PoE++ models
M4250-26G4F-PoE++M4250-26G4XF-PoE+M4250-26G4F-PoE+Fan Mode
Off mode
Off mode is not supported≤ 105F (41C)
≤ 114F (46C)
≤ 109F (43C)
≤ 116F (47C)
Temp. sensor 1 or
Temp. sensor 2
≤ 45W≤ 45WPoE budget
Maximum 8 Ethernet ports
active. SFP+ ports not
active.
Maximum 8 Ethernet ports
active. SFP ports not
active.
Load
OffOffFan use
Quiet mode with fan use below 30%
< 102F (39C)
< 105F (41C)
< 107F (42C)
< 116F (47C)
< 111F (44C)
< 118F (48C)
Temp. sensor 1 or
Temp. sensor 2
≤ 420W≤ 480W≤ 300WPoE budget
Full traffic loadFull traffic loadFull traffic loadLoad
< 30%< 30%< 30%Fan use
Quiet mode with fan use from 30–100%
102F (39C) – 123F (51C)
105F (41C) – 127F (53C)
107F (42C) – 118F (48C)
116F (47C) – 123F (51C)
111F (44C) – 123F (51C)
118F (48C) – 125F (52C)
Temp. sensor 1 or
Temp. sensor 2
420W – 1440W with both
power supplies active.
≤ 480W≤ 300WPoE 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 M4250-26G4F-PoE+ operate in Off mode and either the temperature
detected by the temperature sensor 2 exceeds 116F (47C) or the PoE budget exceeds
45W, the switch automatically places the fans in Quiet mode.
Hardware Installation Guide41Hardware Overview
AV Line of Fully Managed Switches M4250 Series
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