In the U.S., Comcast, Cox, and Time Warner are adopting set-top boxes that support Docsis Set-top Gateway (DSG) technology and OpenCable Application Platform (OCAP) middleware.
DSG uses DOCSIS cable modem technolgoy for out-of-band video signaling. It enables cable operators to send and receive data from subscriber set-top boxes that include electronic program guides, emergency alerts, and downloadable conditional access.
The OCAP middleware provides a standard interface that can support common third party applications across multiple set-top boxes and across multiple cable operators.
DSG and OCAP bring many of the advantages of IPTV to the cable companies. The cable companies will slowly deploy this technology, using it mainly to support new digital subscribers. It is quite unlikely that they will make a wholesale swap out. This means that the IPTV networks will continue to have significant technical advantages over cable networks in terms of deployed capability.
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