- The M1 service port module provides various service access ports, such as PON, P2P, POTS, and Huawei xDSL service ports.
- The M2 core processing module implements CPU processing, Ethernet switching, and service processing.
- The M3 uplink port module transmits service flows upstream to network-side devices.
In the preceding figure:
- The M1 service port module and M3 uplink port module connect to different boards. For details of working principles of each module, see board description in the Hardware Description.
- For details of service flow directions in the M1 service port module, see board working principles in the Hardware Description.
- The service flows processed by the M2 core processing module are classified into two types: One type of service flows are transmitted upstream after they are processed by the Ethernet switching module and the M3 uplink port module; the other type of service flows are transmitted upstream after they are processed by the Ethernet switching module, service processing module, and then Ethernet switching module again.
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