3Com 3CNJ1000 - IntelliJack Gigabit Switch Посібник із швидкого старту - Сторінка 8
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Друкувати сторінку1. Understand the Power Options
Power to the NJ1000 can be supplied through either PoE (either 802.3at or 802.3af)
applied to the uplink port or through the optional local external power supply.
If power is supplied to the uplink port by 802.3at or by the external power supply,
then ports 1 and 2 may act as PoE PSE (Power Source Equipment) and may also
provide power to other devices plugged into those ports. If power is supplied by
802.3af, then port 1 and 2 will not be able to supply PoE power. Refer to Table 4 for a
summary of this information.
Table 4
Input Power
802.3at
Local External Power Yes
802.3af
2. Understand the PoE Capabilities for Port 1 and Port 2
If power is supplied by 802.3at through the uplink port (PD) or if power is supplied
through the external power supply, then ports 1 and 2 may in turn act as PoE PSE and
may provide power.
If power is provided to the NJ1000 by the uplink port (PD) with 802.3at PoE or with
the external power supply, then the NJ1000 will have a total PoE PSE budget of
15.4W, which can be divided between port 1 and port 2 based on the class-based
power management feature.
The NJ1000 can power these combinations of devices:
One Class 0,3 PD device or
■
Two Class 2 PD devices or
■
Two Class 1 PD devices or
■
PoE Forwarding on Ports 1 and 2?
Yes
No
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