A thin film transistor device structure and a method for fabricating the thin film transistor device structure each comprise a thin film transistor device formed over a substrate. A Provider Backbone Bridge network is provided which comprises a plurality of sites to be connected via a L2VPN. Additionally, the cage includes a threaded lateral side having an arcuate profile, and a medial side having a concave channel extending along the length of the cage. Also, the invention can be programmed to generate a specific data message for transmission to another appliance. The polymer electrolyte membrane can save manufacturing cost of a fuel cell and improve proton conductivity and mechanical strength.