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CATV系统为旅客及车站办公人员提供综合视频信号。随着数字电视的普及,越来越多的既有站房、行车公寓进行了数字信号传输模式改造。现有的改造方式利用了既有的区域网电视信号传输通道,未对传输方式进行变革,不能满足数字电视更大的数据流量。一种将ATM技术和PON模式结合的APON技术满足数字电视的传输需求,且传输距离长,适用于新建大型站房。
The CATV system provides integrated video signals to travelers and station staff. With the popularization of digital television, more and more existing station buildings and condominiums have been transformed by digital signal transmission mode. Existing reconstruction methods make use of the existing LAN television signal transmission channel, without changing the transmission mode, and can not meet the greater data flow of digital television. A combination of ATM technology and PON mode APON technology to meet the transmission needs of digital television, and long transmission distance, suitable for large-scale construction of new stations.