Dc Power Supply Units; Function Overview - Huawei S5700 Series Hardware Description

S5700&S5710 Series Ethernet Switches
Hardware Description
Figure 2-4 Working mode of two PoE AC power supply units
Motherboard
PWR1
L: Live line
After the PoE power is transmitted to the PWR module except S5700-28P-PWR-LI-AC and
S5700-52P-PWR-LI-AC, 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).
Figure 2-5 Working mode of a PoE AC power supply unit
Motherboard
L: Live line
S5700-28P-PWR-LI-AC and S5700-52P-PWR-LI-AC have built-in PoE power supply units,
which provides a channel of 12 V voltage and a channel of -53 V voltage. The 12 V voltage is
provided for the entire device, and the -53 V voltage is provided for the PDs.
2.3 150 W DC Power Supply Units
This section describes the functions, appearance, switch, indicators, and technical specifications
of the S5700 150 W DC power supply unit.

2.3.1 Function Overview

The 150 W DC power supply unit provides +12 V DC power. It has the following functions:
Issue 01 (2012-03-15)
-53V RTN
12V GND
PWR2
L N PGND L N PGND
N: Neutral wire PGND: PGND cable
-53V RTN
12V
PWR1
L N PGND
N: Neutral wire PGND: PGND cable
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GND: Grounding
GND
GND: Grounding
2 Power Supply Unit
RTN: Ground cable
RTN: Ground cable
28