基本上，有线电视是一种资本密集的产业，主要支出则包括硬件传输的各种设备以及每个月的频道购买成本。
Basically, it is realized that cable TV is a capital-intensive industry, which has to be maintained under the huge cost of transmission hardware and program channels.
介绍了SDXC的基本概念与功能、SDXC设备的分类、SDXC设备结构以及在某电信专用传输网中的应用。
It introduces basic concept and function of SDXC equipment, SDXC equipment architecture and its application to a particular telecom transmission network.
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