Huawei SmartAX MA5600T Hardware Description page 537

SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Hardware Description
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The service process of the H80AATRB board is as follows:
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Issue 24 (2018-07-30)
The integrated CPU performs the functions of software loading, running control, and
management.
DSP manages the voice chipset through the SPI interface, and transmits the voice media
stream through the HW interface.
The voice chipset codec performs the functions of the data access arrangement (DAA)
chip control, power supply, and HW interface conversion.
The DAA chip performs the functions of ringing current detection, line polarity
detection, onhook, offhook, and conversion between analog voice signals and digital
signals.
The protection module provides a protection capacity of 1.5 kV in differential mode.
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.
In the upstream direction, the service data is transmitted to the H80AATRB board
through the FXO interface. After being processed by the DAA module, the codec
module, and the DSP module, the service data is transmitted to the control board through
the backplane and then to the upstream device.
In the downstream direction, the service data is transmitted from the control board to the
DSP module, the codec module, and the DAA module through the backplane bus and the
interface module. After being processed, the service data is transmitted to the subscriber
through the FXO interface.
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