Based on the specifications provided by the CMS Experiment, the Network and Storage requirements for a Tier 2 site (T2) are analyzed. A proposal for a possible solution is presented and discussed, targeted to the Pisa CMS T2 site. In the analysis, the current situation of the Pisa Grid Data Center is taken as a starting point, and the future growing path is taken into account for the next couple of years. Two different final architectures are presented.