1 、 采用至少三种宽带接入方式，为高层密集小区的用户提供宽带接入服务。 2 、 请分别详细叙述采用相应接入技术时，由个人电脑至核心网络的路径上所涉及的通信机制，协议。 3 、 对各种接入技术的优势及局限性进行详细对比分析。 三种接入方式如图所示。 用户COFTTH用户COFTTB用户COFTTC图 1 FTTH图 2 FTTB图 3 FTTC 目录 1 三种宽带接入方式········································································································1 2 接入技术·······················································································································1 2.1 FTTH·························································································································2 2.1.1 通信机制········································································································2 2.1.2 协议················································································································4 2.1.3 优势以及局限性····························································································5 2.2 FTTB·························································································································7 2.2.1 通信机制·...
