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PUBLIC MARKS from jackiege with tags security & iptv

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AT&T选择小规模测试IPTV，而Verizon配置一个规模和有线运营商相似的信号系统。除此以外，Verizon还借助光纤传输提供付费IPTV服务。Verizon已经在多个城、镇提供他的收费IPTV服务，而AT&T在少数城镇测试他的商业服务。

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