Huawei SmartAX MA5600T Hardware Description page 684

SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Hardware Description
Working Principle
Figure 3-127 Working principle of the H80AVCPM board
The basic working principle of the H80AVCPM 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 entire board.
The forwarding module converts between the ATM/PTM service and the IP service, and
also supports flow control and scheduling.
The interface module provides the ports for information exchange.
The protection module protects and isolates the board from lightning strikes.
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 line signals into cell
flows, aggregates the cell flows to the forwarding module, and then reassembles the cell
flows into PTM packets. The forwarding module encapsulates the reassembled 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. 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 module decapsulates the IP packets sent
from the backplane bus, performs CAR on the packets, reassembles the packets into
PTM packets, and then transmits the PTM packets to the interface module. The interface
module then converts the PTM packets into analog signals, and transmits the analog
signals over the subscriber line.
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