[tristor]

You're correct that there is also DOCSIS QOS being performed and this happens regardless of who supplied the modem, this affects traffic between the modem and the head-end, but past the head-end traffic is shaped using other techniques. QoS is protocol specific, and based on the behavior I've observed I believe they are doing application classification and doing IP QoS on the CPE in addition to any DOCSIS QoS applied regardless. I'm a little rusty on my understanding of the DOCSIS specs, but this is a L2 protocol and QoS applied here isn't based on application classification, AFAIK.