Working Mode Of Poe Ac Power Supply Units; 170 W Dc Power Supply Units - Huawei Quidway S3700 Series Manual

Quidway S3700 Series Ethernet Switches
Hardware Description
After the AC power is transmitted to the PWR module on the S3700-26C-HI, the PWR module
outputs 12 V voltage, and then the motherboard provides power for the entire device.
Figure 2-4 Working mode of a non-PoE AC power supply unit that functions alone
Motherboard
L: Live line
On a switch except S3700-26C-HI, 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 S3700 PoE AC power supply units is shown in
Figure 2-5 Working mode of PoE AC power supply units
Motherboard
PWR1
L: Live line
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).

2.3 170 W DC Power Supply Units

This section describes the functions, appearance, switch, indicators, and technical specifications
of the S3700 170 W DC power supply unit.
Issue 02 (2011-11-21)
12V
PWR1
L N PGND
N: Neutral wire
-53V RTN
12V GND
PWR2
L N PGND L N PGND
N: Neutral wire PGND: PGND cable
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GND
PGND: PGND cable
GND: Grounding
2 Power Supply Unit
GND: Grounding
Figure 2-5.
RTN: Ground cable
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