Working Mode Of Non-Poe Ac Power Supply Units - Huawei Quidway S3700 Series Manual

Quidway S3700 Series Ethernet Switches
Hardware Description
Figure 2-1 Working mode of DC power supply units
Motherboard
PWR1
NEG: Power cable
S3700-26C-HI After the DC power is transmitted to the PWR module, the PWR module outputs
12 V voltage, and then the motherboard provides power for the entire device.
Figure 2-2 Working mode of DC power supply units
Motherboard
NEG: Power cable
On a switch except S3700-26C-HI, 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 S3700 non-PoE AC power supply units is shown in
Figure
Figure 2-3 Working mode of non-PoE AC power supply units
Motherboard
PWR1
L: Live line
Issue 02 (2011-11-21)
12V GND
PWR2
NEG RTN
PWR1
2-4.
12V GND
PWR2
L N PGND
N: Neutral wire
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
NEG RTN
RTN: Ground cable
12V GND
NEG RTN
RTN: Ground cable
L N PGND
PGND: PGND cable
2 Power Supply Unit
GND: Grounding
GND: Grounding
Figure 2-3
GND: Grounding
and
16