Unlike Comcast and Cox, PlusNet in the U.K. says what it is doing:

The principles of PlusNet’s network management policies

• To make sure that time-critical applications like VoIP and gaming are always prioritised
• To protect interactive applications like web-browsing and VPN from non-time sensitive download traffic
• To flex the network under demand to cope with normal peaks and troughs from day to day and month to month
• To flex the network more gracefully than other ISPs in the event of unusual demands in traffic or disaster situations such as a network failure
• To provide a service relative to the amount each customer pays in terms of usage and experience
• Provides a ‘quality of service’ effect, meaning multiple applications running on the same line interact with each other effectively, and use of high demand protocols like Peer-to-Peer doesn’t swamp time-sensitive traffic such as online gaming or a VoIP call.

— Traffic Prioritisation, PlusNet, accessed 26 Nov 2007

Interestingly, this list does not cite video as the most-favored application, instead it lists VoIP and gaming, which are participatory services. However, scan down to their table of types of traffic, and VoIP and gaming are Titanium, while video-on-demand is the highest level, Platinum. Continue reading →