Huawei SmartAX MA5600T Hardware Description page 673

SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Hardware Description
Working Principle
Figure 3-125 Working principle of the H802VDJM board
Backplane
Control
board
-48V
DC
power
The basic working principle of the H802VDJM board is as follows:
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The service process is as follows:
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Issue 24 (2018-07-30)
H802VDJM
GE
Forwarding module
Interface
module
Control
module
Power
module
Voltage required
by the board
Service Control
signal signal
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 interface module supports modulation and demodulation of the VDSL2 service.
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.
The MELT module provides the MELT test function for digital subscriber lines.
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
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Front panel
Protection module
DC
Protector
block
MELT
module
Clock
module
Clock required
by the board
Power
signal
3 Board
VDSL
over
ISDN
VTU-R
xDSL1
xDSL0
ISDN
PSTN
Clock Test
signal signal
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