5．树型结构 传统的有线电视（Cable TeleVision/Community Antenna TeleVision，CATV）网往往采用 树型-分支结构，很适于单向广播式业务。在光纤接入网中，这种结构再次显示了很强的生命 力。
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“趋势电视”建立的时候，传统的有线电视台都搞不懂，还嘲笑它。
When Current TV was launched, the traditional cable channels “didn't get it” and sneered, Mr Hyatt recalls with glee.
反观传统的有线电视，节目内容有限，少则二三十套节目，节目不能互动，必须按时收看，过时不候。
In the traditional cable TV program is limited, sets of programs is less, the program can't interaction, must on time watching, outdated don't wait.
电话、收音机、广播电视和有线电视都具有传统的传送模拟数据。
Telephone radio, broadcast television, and cable TV have traditionally transmitted analog data.
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