核心网,骨干网,支撑网,接入网与驻地网

将业务提供者与接入网，或许，将接入网与其他接入网联接在一起的网络。通常指除接入网和用户驻地网以外的网络部分。

(A network that connects a service provider with an access network, and perhaps, an access network with other access networks. Usually refers to the part of the network other than the access network and the customer premises network.)

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