Huawei SmartAX MA5600T Hardware Description page 707

SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Hardware Description
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Issue 24 (2018-07-30)
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
PTM packets, and then transmits the PTM packets to the interface module. The interface
module then converts the PTM packets into analog signals, and transmits the analog
signals over the subscriber line.
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