Huawei SmartAX MA5600T Hardware Description page 735

SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Hardware Description
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Issue 24 (2018-07-30)
After being processed by the control board, the IP packets are transmitted upstream to
the upper-level device through the optical or electrical port.
In the downstream direction, the forwarding module decapsulates the IP packets sent
from the backplane bus, performs CAR on the packets, reassembles the packets into
ATM/PTM packets, and then transmits the ATM/PTM packets to the interface module.
The interface module then converts the ATM/PTM packets into analog signals, and
transmits the analog signals over the subscriber line.
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