Huawei SmartAX MA5600T Hardware Description page 657

SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Hardware Description
Working Principle
Figure 3-122 Working principle of the H80BVCMM board
The basic working principle of the H80BVCMM board is as follows:
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The service process 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 entire 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 forwarding module converts between the ATM/PTM service and the IP service, and
also supports flow control and scheduling.
The framer module forwards vectoring data.
The interface module provides the ports for information exchange.
The power module supplies power to each functional module of the board.
The clock module provides clock signals for each functional module of the board.
In the upstream direction, the interface module converts the VDSL2 signals into a cell
flow, aggregates the flow to the forwarding module, and then reorganizes the cell flow
into ATM/PTM packets. The forwarding module encapsulates the reorganized
ATM/PTM packets and performs CAR on the ATM/PTM packets to convert them into IP
packets. The IP packets are transmitted to the backplane bus through the backplane port
and then to the control board. After being processed by the control board, the IP packets
are transmitted upstream to the upper level device through the optical or electrical port.
In the downstream direction, the forwarding logic decapsulates the IP packets from the
backplane bus, performs CAR on the IP packets, reorganizes the IP packets into
ATM/PTM packets, and transmits the ATM/PTM packets to the interface module. The
interface module converts the ATM/PTM packets into analog signals and then transmits
the signals to subscriber lines.
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