Panasonic KX-TDA0172 16-Port Digital Extension Card DLC16Good Condition16-Port Digital Line Card (DLC16)Supports T7600 and T7400 series (DPT) telephones, DSS consoles and KX-T0141 cell stationRequires 1 free slotUse with KX-TDA100, KX-TDA200, KX-TDA600, KX-TDE100, KX-TDE200, KX-TDE600 systems..