Huawei SmartAX MA5600T Hardware Description page 337

SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Hardware Description
Working Principle
Figure 3-47 Working principle of the H801MPWC board
The basic working principle of the H801MPWC board is as follows:
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Issue 24 (2018-07-30)
The H801MPWC board leads in the -48 V or -60 V power input through the 3V3 power
connector, and transfers the power to the current limit protection circuit, then to the filter
circuit, and finally to the backplane, supplying power to the subrack and other boards.
The detection and reporting circuit checks the protection fuse for any faults, and reports
the detection signals to the control board. The control board indicates these detection
signals through indicators.
The detection and reporting circuit checks for availability of power supply.
The E2PROM circuit stores the board manufacture information.
The H801MPWC board leads in the 3.3 V power from the backplane to power certain
internal chips of the board.
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