Building Entrance Protector. New Tech Industries features building entrance protectors from Circa, Porta Systems, LEA Networks and TII. Building entrance protectors or building entrance terminals are used to protect telecom and datacom equipment from over voltage situations.1  1 Pin Modules. 2  6 Pair. 3  12 Pair.4  25 Pair.5  50 Pair. 6  100 Pair. 7  200 Pair. 8  5 Pin Modules. 9  Category 5E. 10  Category 6. 11  Central Office. 12  Testers.uilding entrance protectors or building entrance terminals are used to protect telecom and datacom equipment from over voltage situations. 1  1 Pin Modules. 2  6 Pair. 3  12 Pair. 4  25 Pair. 5  50 Pair. 6  100 Pair. 7  200 Pair. 8  5 Pin Modules. 9  Category 5E. 10  Category 6. 11  Central Office. 12  Testers.