Table 9. Fan operation properties for the 8-port PoE+ and PoE++ models (Continued)
M4250-10G2XF-PoE++M4250-10G2XF-PoE+M4250-10G2F-PoE+Fan Mode
Quiet mode with fan use from 25 – 100% (20 – 100% for model M4250-10G2XF-PoE++)
≥ 100F (38C)≥ 93F (34C)≥ 93F (34C)Temp. sensor
200W – 720W≤ 240W≤ 125WPoE budget
Full traffic loadFull traffic loadFull traffic loadLoad
≥ 20 – 100%≥ 25 – 100%≥ 25 – 100%Fan use
Cool mode with maximum cooling
100%100%100%Fan use
Example of intelligent fan operation:
If the fans of model M4250-10G2F-PoE+ operate in Off mode and either the temperature
detected by the temperature sensor exceeds 93F (34C) or the PoE budget exceeds
80W, the switch automatically places the fans in Quiet mode.
Note: In Quiet mode, the fans can temporarily operate at 100 percent speed.
The following table describes the fan operation messages that the switch records in its
logs if a temperature threshold is exceeded and the action that occurs if a critical
temperature level is exceeded. (The temperatures in Fahrenheit are rounded down.)
Table 10. Fan operation messages recorded in the log and action if a critical temperature level is exceeded
M4250-10G2XF-PoE++M4250-10G2XF-PoE+M4250-10G2F-PoE+Message and Action
≥ 141F (61C)≥ 114F (46C)≥ 113F (45C)Warning
≥ 145F (63C)≥ 120F (49C)≥ 118F (48C)Critical
≥ 156F (69C)≥ 127F (53C)≥ 127F (53C)Shutdown
PoE is disabled.PoE is disabled.PoE is disabled.Temporary shutdown action
The fans are placed in
Cool mode.
The fans are placed in
Cool mode.
The fans are placed in
Cool mode.
Note: A shutdown action does not shut down the switch but limits the operation of the
switch. PoE is disabled and the fans are placed in Cool mode. To return the switch to
normal operation, you must restart the switch.
Hardware Installation Guide40Hardware Overview
AV Line of Fully Managed Switches M4250 Series
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