Huawei Quidway S3300 Series - Figure 2-3 Working Mode of Poe AC Power Supply Units; Figure 2-2 Working Mode of Non-Poe AC Power Supply Units; Working Mode of Non-Poe AC Power Supply Units; Working Mode of Poe AC Power Supply Units

On a switch, after the DC power is transmitted to the PWR module, the PWR module outputs
12 V voltage, and provides power for the entire device.
2.2.2 Working Mode of Non-PoE AC Power Supply Units
The working mode of the S3300 non-PoE AC power supply units is shown in Figure 2-2.
Figure 2-2 Working mode of non-PoE AC power supply units
Motherboard
GND12V
PWR1
L N PGND
L: Live line N: Neutral wire PGND: PGND cable GND: Grounding
On a switch, after the AC power is transmitted to the PWR module, the PWR module outputs
12 V voltage, and provides power for the entire device.
2.2.3 Working Mode of PoE AC Power Supply Units
The working mode of S3300 PoE AC power supply units is shown in Figure 2-3.
Figure 2-3 Working mode of PoE AC power supply units
PWR1
L N
Motherboard
GND12V
PGND
PWR2
L N PGND
-53V RTN
L: Live line
N: Neutral wire PGND: PGND cable GND: Grounding RTN: Ground cable
After the PoE power is transmitted to the PWR module, the PWR module outputs 12 V and -53
V voltage, and then the motherboard provides 12 V voltage for the entire device and -53 V
voltage for the powered devices (PDs).
2 Power Supply Unit
Quidway S3300 Series Ethernet Switches
Hardware Description
2-4 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 01 (2011-01-30)