D-Link DES-3528 - xStack Switch - Stackable, Руководство пользователя, Страница: 43 / 322

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DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual
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PoE
The DES-3528P switch supports Power over Ethernet (PoE) as defined by the IEEE 802.3af. Ports 1-8 can support
PoE up to 35W. Ports 1-24 can supply about 48 VDC power to Powered Devices (PDs) over Category 5 or Category 3
UTP Ethernet cables. The DES-3528P follows the standard PSE (Power Sourcing Equipment) pinout
Alternative A ,
whereby power is sent out over pins 1, 2, 3 and 6. The DES-3528P works with all D-Link 802.3af capable devices.
The DES-3528P includes the following PoE features:
•
Auto-discovery recognizes the connection of a PD (Powered Device) and automatically sends power to
it.
•
The Auto-disable feature occurs under two conditions: firstly, if the total power consumption exceeds
the system power limit; and secondly, if the per port power consumption exceeds the per port power
limit.
•
Active circuit protection automatically disables the port if there is a short. Other ports will remain active.
Based on 802.3af/at PDs receive power according to the following classification
:
Class Maximum power available to PD
0 12.95W
1 3.84W
2 6.49W
3 12.95W
4 29.5W
To configure the PoE features on the DES-3528P, click
Configuration > PoE
. The
PoE System Settings
window is
used to assign a power limit and power disconnect method for the whole PoE system. To configure the
Power Limit
for the PoE system, enter a value between 37W and 370W for the DES-3528P in the Power Limit field. The default
setting is 370W. When the total consumed power exceeds the power limit, the PoE controller (located in the PSE)
disconnects the power to prevent overloading the power supply.
PSE provides power according to the following classification:
Class Max power used by PSE
0 15.4W
1 4.0W
2 7.0W
3 15.4W
User define 35W (only for ports 1-8)