Principle 4: No reduction in quality
The quality of Internet access and of non-preferred services must suffer no degradation following traffic differentiation.
Firstly, prioritisation of specific users, for example, must not impair the quality for other users. Secondly, the quality of services not given “preferential” treatment must not be degraded. If these conditions are not satisfied, differentiation practices can result in some end users suffering degrading, and therefore being disadvantaged.