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光网络建设是国家“宽带中国”最重要的一环,ODN(Optical Distribution Network)是基于PON设备的FTTH(Fiber To The Home)光缆网络,主要是为OLT(optical line terminal)和ONU(Optical Network Unit)之间提供光传输通道。从功能上分,ODN从局端到用户端可分为馈线光缆子系统、配线光缆子系统、入户线光缆子系统和光纤终端子系统。目前城市光纤网络经过中国电信、中国移动、中国联通以及广播电视网络等多家运营商的常年建设,光纤接入网络的覆盖率已经超过90%甚至更高,但是作为农业大省,广西农村区域的宽带接入还停留在传统铜缆接入ADSL的阶段,光纤网络覆盖率不足10%。
Optical network construction is the most important part of the national “Broadband China”. ODN (Optical Distribution Network) is a fiber to the home (FTTH) fiber optic cable network based on PON equipment, and is mainly used for optical line terminals (OLTs) and ONUs Optical Network Unit) between the optical transmission channel. From the functional point, ODN from the central office to the client can be divided into feeder cable subsystem, cable subsystem, cable subsystem and fiber terminal subsystem. At present, the optical fiber network in the city has exceeded 90% and even higher coverage of optical fiber access networks through the perennial construction of many operators such as China Telecom, China Mobile, China Unicom and radio and television networks. However, as a major agricultural province, Guangxi rural area Broadband access also stays in the traditional copper access ADSL stage, optical network coverage of less than 10%.