Huawei SmartAX MA5600T Hardware Description page 734

SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Hardware Description
Working Principle
Figure 3-136 Working principle of the H80BVDQM board
The basic working principle of the H80BVDQM board is as follows:
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The service processing is as follows:
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Issue 24 (2018-07-30)
The control module loads the board software, controls the running of the board, and
manages the board.
The protection module protects and isolates the board from lightning strikes. The DC
block isolates the direct current. The protector protects the high voltage.
The interface module provides two functions:
– In the upstream direction, the interface module converts line signals into cell flows,
aggregates the cell flows to the forwarding module, and then reassembles the cell
flows into ATM/PTM packets.
– In the downstream direction, the interface module converts the ATM/PTM cell
flows sent from the forwarding module into line signals that are transmitted
downstream.
The forwarding module processes services. For details, see the description of service
processing.
The MELT module provides the MELT test function for digital subscriber lines.
The power module supplies power to other functional modules of the board.
The clock module provides the working clock for other functional modules of the board.
In the upstream direction, the interface module converts the VDSL2 line signals into cell
flows, aggregates the cell flows to the forwarding module, and then reassembles the cell
flows into ATM/PTM packets. The forwarding module encapsulates the reassembled
ATM/PTM packets into IP packets, performs CAR on the IP packets, and then sends the
IP packets to the backplane bus through the backplane port and then to the control board.
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