QTECH QSW-3400 Инструкция по настройке - Manual (Page 465)

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without affecting other devices. Such a power supply buffer of 10W is designed for
power source protection, and calls for special attention.

The displayed value of Power might over the value of Max. This involves the
relationship between the displayed power and the actual power, for instance:

The power set on the port: A, represents the actual output PoE power

The displayed power: B, represents the total power of the port (total current ? total
voltage)

The power loss set on the port: C, represents power loss of the internal Sensor ohmic
resistance, MosFet etc.

Then: B=A+C

If the power is set as A=500mW, according to the following table, the compensating
current will be I=2.44mA (500mW/50V=10mA assuming the current working voltage is
50V), plus the compensating power C=50V?2.44mA=122mW

B=A+C=500+122=622mW. So, only when the displayed power reaches 622mW, the
PD will be disconnected

Table:
Max Working Current (mA) Compensating Current (mA)
50 2.44
100 4.88
150 9.76
200 17.08
250 24.41
350 31.73