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在比较常见的公共传输系统中，（32)是以模拟技术为基础的电路交换网络；（33)是基于城域网协议的包交

在比较常见的公共传输系统中，(32)是以模拟技术为基础的电路交换网络；(33)是基于城域网协议的包交换公共数据网络；(34)提供基于线路交换的端到端的数字连接通道。帧中继的典型速率范围是(35)。

A．SMDS

B．ISDN

C．DDN

D．PSTN

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