Milan Technology MIL-SM2401MAF - Manual (Page 22)

14
Power over Ethernet Application
DC Power Input
The 24 10/100TX plus 2 SFP/Copper managed POE switch provides 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 provided in the network
environment. The AC power and the DC 48V 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 connected power supply device.