... service-specific convergence sublayer (SSCS) 特定业务汇聚子层 services switching point (SSP) 业务交换点 services, basic communications 基本通讯服务 ...
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Topics summarized here include point-to-point links, circuit switching, packet switching, virtual circuits, dialup services, and WAN devices.
在这里概述的题目包括点对点链路，电路交换，分组包交换，虚电路，拨号服务，和WAN设备。
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