2.2 PIU - Power Interface Board
This section describes the TND1PIU, a power interface board, in terms of the overview,
functions, features, working principle, front panel, and technical specifications.
2.2.1 Overview
The TND1PIU (PIU for short) is a power interface board. The function version of the PIU is
TND1. The PIU is housed in slot 9 or slot 10.
2.2.2 Functions and Features
The PIU, a power interface board, supports the functions and features such as power access,
power protection, surge protection detection, and information reporting.
Table 2-1 lists functions and features of the PIU.
Table 2-1 Functions and features of the PIU
Function and Feature
Description
Power access Each of the two PIU accesses one -48 V DC (or -60 V DC) power
supply for the equipment.
Power protection The PIU protects the power supply against overcurrent and short
circuit. In this way, the overcurrent is prevented from shocking
board and components on it.
Surge protection The PIU protects the equipment against lightning and reports an
alarm if the protection fails.
Power backup Two PIU boards can achieve 1+1 hot backup. One PIU is capable
of supplying power for the entire chassis.
2.2.3 Working Principle and Signal Flow
The PIU mainly consists of the surge protection and failure detection module, communication
unit module, slot ID module, and board in-position module.
Figure 2-3 shows the block diagram for the working principle of the PIU.
ATN 950B Multi-service Access Equipment
Hardware Description 2 Power Supply System
Issue 03 (2012-07-23) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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