1600 W Dc Power Supply; Function Overview; Appearance And Panel - Huawei S7700 Hardware Description

S7700 Smart Routing Switch
Hardware Description
Figure 3-5 Principle of the AC power supplies on the S7700
Backplane
AC
L: live wire

3.2 1600 W DC Power Supply

This section describes the panel, functions, and technical specifications of 1600 W DC power
supplies on the S7700.

3.2.1 Function Overview

The 1600 W DC power supply provides output of -48 V or -60 V. It provides the following
functions:
l
l

3.2.2 Appearance and Panel

The power supplies are installed at the bottom of a chassis and are used for power input and
power distribution.
A -48 V or -60 V DC power supply uses the standard structure.
of a 1600 W DC power supply on an S7700.
Issue 02 (2012-09-10)
Board 1
-48VA
RTNA
PWR1
L
N PGND
L N
AC
N: neutral wire
EMC filtering, lightning proof, and short circuit protection.
Various alarms, for example, no-input alarm, air breaker off alarm, invalid lightening-proof
alarm, and input undervoltage alarm.
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Copyright © Huawei Technologies Co., Ltd.
Board 2
-48VA -48VB
RTNA
PWR2 PWR3
PGND L N PGND
AC
Board n
-48VB
RTNB
PWR4
L N PGND
AC
PWR1-PWR2 -48VA
PWR3-PWR4 -48VB
PWR1-PWR2 RTNA
PWR3-PWR4 RTNB
PGND: PGND wire
Figure 3-6 shows the appearance
3 Power Supply
RTNB
37