Throttling is a negative term. QoS is the positive term. All ISPs who use the same fiber for voice, data, and video apply QoS. Using separate fibers for each is de facto throttling. Some non-wiki here as it pertains to the NBC-Universal acquisition...
http://blog.streamingmedia.com/2012/...t-traffic.html
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Based on details I have gotten from those who have looked at how packets are marked on their home broadband connections provided by Comcast, packets are in fact being marked with Quality of Service tags. Services from MLB, Hulu and Netflix are marked with CS1 tags and Xfinity is marked as CS5. In tests, the Xfinity traffic originates from servers inside Comcast's network and the other traffic originates on Level 3 and Akamai servers outside Comcast's network. All of these QoS tags are put on by Comcast.
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