The paper begins with explaining the national telecommunication network is composed of backbone network and access network, and there are wired access network and wireless access network.
本文先说明国家通信网有骨干网和接入网，而接入网有有线接入网和无线接入网。
The paper begins with explaining the national telecommunication network is composed of backbone network and access network, and there are wired access network and wireless access network.
本文先说明国家通信网有骨干网和接入网，而接入网有有线接入网和无线接入网。
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