Working Principle
Figure 3-103 Working principle of the H808ADIF board
H808ADIF
B
a
c
k
p
l
a
n
e
C
o
n
n
e
c
t
o
r
ADSL2+
PSTN
-48V
DC
power
Power
module
Voltage required
by the board
Clock
module
Clock required
by the board
Control
board
Clock
signal
Service
signal
Control
signal
Power
signal
Backplane
S
P
L
b
o
a
r
d
Front panel
ISDN
ATU-R
ADSL2+
over
ISDN
GE
Control
module
Interface
module
Forwarding module
Protection module
DC
block
Protector
The basic working principle of the H808ADIF 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 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:
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.
528
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