metropolitan-area network meaning in Chinese

城域网

Sonet has long been the medium of choice for delivering services over metropolitan - area networks ( man )
同步光缆网（ sonet ）早已是在城域网（ man ）上提供服务的媒介选择。
With the rapid growth of internet , the demand for network service has gone up quickly . to meet the increasing demands of our local people , we have built a broadband man ( metropolitan - area networks ) in changsha city . this network makes up of gsr ( gigabit switch router ) , l3 ( layer three switch ) , bas ( broadband access server ) , l2 ( layer two switch ) , dslam ( digital subscriber line access multiplexer ) and hfc ( hybrid fiber coaxial )
本文在长沙宽带城域网现行gsr (吉比特交换路由器) ( l3 (三层交换机) bas (宽带接入服务器) ( l2 (二层交换机) dslam (数字用户线接入) hfc (混合光纤同轴技术) )组网方案和长沙电信已有业务平台的基础上，设计了长沙宽带城域网用户综合管理系统。