Working Principle
Figure 3-109 Working principle of the H80BADPE board
The basic working principle of the H80BADPE board is as follows:
l The control module loads the board software, controls the running of the board, and
manages the entire board.
l The protection module protects and isolates the board from lightning strikes. The DC
block isolates the direct current. The protector protects the high voltage.
l The splitter module separates POTS signals from ADSL2+ signals over the subscriber
line.
l The interface module supports two functions:
– In the upstream direction, the interface module converts line signals into a cell flow,
aggregates the flow to the forwarding module, and then reorganizes the flow into
ATM packets.
– In the downstream direction, the forwarding module transmits the ATM cell flow to
the interface module. Then, the interface module converts the flow into downstream
line signals.
l The forwarding module processes services. The detailed process is described later.
l The power module supplies power to each functional module of the board.
l The clock module provides clock signals for each functional module of the board.
The service process is as follows:
l In the upstream direction, the splitter module separates POTS signals from ADSL2+
signals over the subscriber cable, and then the interface module transmits such signals to
the forwarding module. The forwarding module reorganizes the cell flow into ATM
packets, encapsulates the ATM packets into IP packets, and then performs CAR on the IP
SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Hardware Description
3 Board
Issue 24 (2018-07-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
557
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