The technology behind the system is slightly different from traditional home security systems from companies, such as ADT. The Comcast Xfinity Home Security system works over a broadband connection rather than a phone connection. And as a result it's able to offer the video service and remote management. The company uses cellular networks as a back up to the broadband connectivity to ensure uptime.
The home security market is worth about $8 billion annually, according to Parks Associates.
From the article, "Comcast expands into home security biz" by Marguerite Reardon
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