H831PDMB

H831PDMB is a DC power board that passes through and converts the combined single -48 V DC power. It then outputs -48 V DC and +12 V DC power to the backplane. Through the backplane, it passes through power to the service boards, centralized vectoring processing board, control board, and fan monitoring board.

Functions and Specifications

• DC power supply (The board supports one -48 V DC input and a total output power of 550 W.)

• Protection against overtemperature, output overcurrent, output short circuit, and output overvoltage

• Input power availability detection and alarming

• FAN power supply detection and alarming

Working Principle

Figure 1 illustrates the working principle of the H831PDMB board.

Figure 1 Working principle of the H831PDMB board

The basic working principle of the H831PDMB board is as follows:

• The protection and filter circuit protects the -48 V DC power input against surges and lightning strikes and also limits current and filters electromagnetic interference (EMI) for the -48 V DC power input.

• The EMC filter circuit performs filtering for circuits.

• The soft-start circuit provides the soft-start function for the -48 V DC power input of the +12 V DC power module.

• The output filter circuit filters the output of the +12 V DC power module.

• The detection and alarming circuit detects the availability of the -48 V DC power and reports the related alarm.

• The fan power supply alarm circuit detects whether the power supply to the fan is normal.

• The e-label and board type reporting circuit stores the board manufacture information and reports the board type.

Ports on the Front Panel

Indicator