Huawei SmartAX MA5603T - Page 766

Working Principle
Figure 3-140 Working principle of the H803SHDA board
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H803 SHDA
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a
c
k
p
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C
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Control
module
-48V
DC
power
Control
board
Service
signal
Control
signal
Power
signal
Clock
signal
User sideBackplane
Power
module
Voltage required
by the board
Clock
module
Clock required
by the board
Interface
module
Switching module
Protection module
DC
block
Protector
16*SHDSL
ONT
The basic working principle of the H803SHDA board is as follows:
l The control module loads the board software, controls the running of the board, and
manages the 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 forwarding module forwards signals. After being processed by the control module,
the signals are then sent to the backplane bus through the backplane connector.
l The interface module inputs, outputs, and converts signals.
l The power module supplies power to other functional modules of the board.
l The clock module provides the working clock for other functional modules of the board.
The service process is as follows:
l In the upstream direction, the interface module transmits subscriber line signals to the
forwarding module. The forwarding module reorganizes the cell flow into ATM/PTM
packets, encapsulates the ATM/PTM packets into IP packets, and performs CAR on the
IP packets. Controlled by the logic switch, the IP packets are transmitted to the
backplane bus through the backplane interface.
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.
746