Transition Networks MIL-SM2401MAF
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The 24 10/100TX plus 2 Mini-GBIC/Copper managed PoE switch has a DC 48V power
input for the extra power supply connection. The DC 48V power input can be used as a
power backup when the AC power is down or no AC power supply in the installation.
The AC power and the DC 48 V power can be connected at the same time, but the
switch will use the DC 48V as the master power input and the AC power as the
secondary or backup power input. The following figures are example of the application.
In the figure, the DC 48V power input connects with the power supply device and
through the RS-232 connection to manage the power supply device.