The TM-8-IDC is designed for telecom distribution systems. The TM-8-IDC supports analog telephone as well as supports digital service such as DSL or ISDN. Used for adding up to 4 phones lines to 8 locations in your home. Supports 8 telephone outlets for phone, fax, and other devices. Expansion port allows connectivity for additional phone locations. Includes RJ31 security port. Color coded 110 style punch-down connections. Phone lines are wired according to TIA/EIA-568 requirements. 1 input x 8 output expandable.