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Currently, there are a lot of e-learning and collaborative platforms to support distance and collaborative learning, however, all of them were designed without considering the network infrastructure below. Under these circumstances when the platform is installed and runs in a campus, sometimes it has very poor performance. This paper presents a network and data link layer infrastructure design that classifies and prioritizes the voice and video traffic in order to improve the performance of the collaborative system applications. This infrastructure has been designed taking in consideration a typical network of a university campus, so that in this way it can be implemented in any campus. After making the design we have made some tests in a laboratory network demonstrating that our design improves 70- 130% the performance of these real time collaborative systems which transmit voice and video.