一、系统规划概述 哈工大CATV系统具有为教学服务和为居民提供优质节目双重任务,故设计时考虑到:1.本地现有开路节目六套,其中V段四套。2.系统最长干线2.5Km。故此,对这样规模系统,我们采用550MHz邻频系统,用其增补频道传送教学节目。集中收看,较易变换,同时利用它比450MHz、300MHz系统多提供10个U频道资源,为居民服务,使得整 I. System Planning Overview The HIT CATV system has the dual mission of teaching services and providing quality programs for residents. Therefore, the design takes into account: 1. There are six sets of local open-circuit programs, including four V-sets. 2. The longest trunk system 2.5Km. Therefore, for such a scale system, we use 550MHz adjacent system, with its additional channels to send teaching programs. Focus on watching, easier to change, while using it more than 450MHz, 300MHz system to provide more than 10 U channel resources for residents, making the whole