RE: Is Comcast prioritizing traffic or not? Some say Comcast is prioritizing data in favor of their streaming products. In this long blog post, a Comcast VP denies it:
Short translation: Not counting traffic against the 250GB cap. Buy also not prioritizing the traffic ahead of other internet traffic from other vendors.
Posted by Tony Werner, Executive Vice President & Chief Technology Officer, in Network and Operations
Specifically, we provision a separate, additional bandwidth flow into the home for the use of this service above and beyond, and distinct from, the bandwidth a customer has for his or her regular Internet access service. Our Xfinity TV content is provided through the Xbox over that separate service flow, and therefore does not use a customer's provisioned Internet service capacity. We use Differentiated Services Code Point ("DSCP") markings to mark the Xfinity TV packets to identify these packets so our network knows that these packets must be transmitted over the separate service flow from the CMTS to the customer's cable modem.
There's also been some chatter that we might be prioritizing our Xfinity TV content on the Xbox. It's really important to us that we make crystal clear that, in contrast to some other providers, we are not prioritizing our transmission of Xfinity TV content to the Xbox (as some have speculated). While DSCP markings can be used to assign traffic different priority levels, that is not their only application and that is not what they are being used for here.