NM350 USER MANUAL
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Functional description
Warning!
For port 5 and 6, Gbit LEDs are on apart from the connection of
1000Base-T, during connection of 100Base-T, but the port itself is
operating only in the 1000Base-T mode.
2.3.1.3 PoE power supply
This technology, together with data, enables the switch to transfer power supply to a remote
device via 2 Ethernet twisted-pair wires in accordance with the IEEE 802.3af standard, using the
method A. This standard allows power supply of devices with the voltage from 44 V to 57 V. The
device supplies power to ext
ernal devices 48V ± 5%.
The IEEE 802.3af standard enables connection of 4 classes of devices, including those with
a power up to 15.4 W per channel, therefore a total load to all of the 4x PoE ports can
’t exceed 62
W. Dependence of the maximum load on ambient temperature conditions is shown in the diagram
below.
Fig. 2-4:
Dependence of the maximum total load to all ports on temperature conditions
Note
When connecting PoE devices with a higher power consumption,
special consideration should be given to the dependence of
maximum total load on ambient temperature, as well as on the
removal of heat from the device.
Operation of PoE microchip of the controller (TPS23841) can be carried out under control of
an external device, connected via an insulated I
2
C bus / SMBus via PWR connector, which
contacts purpose is described below.
P, W
