Building Entrance Terminal (Indoor); 50 Pair; 2650QC/QC IDC style 66 block input and output accepts industry standard 89 type bracket to facilitate cable routing protects up to 50 lines, also available in 6 pair (2606QC/QC), 12 pair (2612QC/QC), 25 pair (2625QC/QC) and 100 pair (26100QC/QC) configuration equipped with an internal fuse link stackable to accommodate future expansion external ground connectors accept 6-14 AWG ground wire accommodates industry standard 5 pin protection modules designed to exceed the requirements set forth in Underwriters Laboratory"s UL497