Working Principle
Figure 3-121 Working principle of the H805VDMF board
GE
H805VDMF
B
a
c
k
p
l
a
n
e
C
o
n
n
e
c
t
o
r
Control
module
-48V
DC
power
Control
board
Service
signal
Control
signal
Power
signal
Clock
signal
Backplane
Power
module
Voltage required
by the board
Clock
module
Clock required
by the board
Interface
module
Forwarding module
Protection module
DC
block
Protector
VTU-R
PSTN
POTS
xDSL1
VDSL
over
POTS
S
P
L
b
o
a
r
d
Front panel
xDSL0
The basic working principle of the H805VDMF 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 forwarding module converts between the ATM/PTM service and the IP service, and
also supports flow control and scheduling.
l The interface module provides the ports for information exchange.
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 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
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.
631
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