Power Supply Unit
PoE Power
Maximum Number of
Interfaces
250 W current
sharing power
supply
-
123.2 W
l
802.3af: 8
l
802.3at: 4
500 W current
sharing power
supply
-
369.6 W
l
802.3af: 24
l
802.3at: 12
250 W current
sharing power
supply
250 W current
sharing power
supply
246.4 W
l
802.3af: 16
l
802.3at: 8
500 W current
sharing power
supply
500 W current
sharing power
supply
739.2 W
l
802.3af: 48
l
802.3at: 24
NOTE
Current sharing indicates that the power of two power supply units can be accumulated for powered devices
(PDs). The power for the device cannot be accumulated.
When two power supply units are used, they work in redundancy backup mode to provide power for the
device and in load balancing mode to provide power for PDs.
2.2 Power Supply Unit Working Mode
This section describes the working mode of S3300 power supply units.
2.2.1 Working Mode of DC Power Supply Units
2.2.2 Working Mode of Non-PoE AC Power Supply Units
2.2.3 Working Mode of PoE AC Power Supply Units
2.2.1 Working Mode of DC Power Supply Units
Figure 2-1
Working mode of DC power supply units
Motherboard
GND
12V
PWR1
NEG RTN
NEG: Power cable
RTN: Ground cable
GND: Grounding
Quidway S3300 Series Ethernet Switches
Hardware Description
2 Power Supply Unit
Issue 01 (2011-01-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
2-3