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一、概述 数字用户环路设备(SLC),光纤用户环路载波(OLC),于80年代中期开始在国外大量采用,90年前后在国内大量采用,特别是当邮电部提出新的电信网络规划之后,原来以C1到C4四级长途网,以C5其本地网为中心的本地网建设,已经明确为:2000年前后全国长途电话网将形成两个“无线网”层面,本地网将以地区中心城市为核心的扩大本地网。
I. Overview Digital Subscriber Loop Equipment (SLC) and Optical Fiber Subscriber Loop Carrier (OLC) began to be widely used in foreign countries in the mid-1980s and extensively adopted in China 90 years ago, especially when the Ministry of Posts and Telecommunications proposed a new telecommunications network plan After the original C1 to C4 four long-distance network to C5 its local network as the center of local network construction, has been clearly defined as: the national long distance telephone network will form two “wireless network” level around 2000, local network will be the region Central city as the core of the expansion of local network.