Data line surges make up an overwhelming majority of all surge-induced damages where the equipment was thought to be already protected but had a back door such as a modem line unprotected. Network interface cards in particular can be destroyed by relatively mild spikes. According to Ethernet standards (IEEE 802.3) non-AC network electrical hazards include: direct contact between components and power or lightning circuits static charge buildup on cables and component high-energy transients coupled onto the local cabling system (those induced by other cables which are installed in the general proximity of network cables or lightning within a mile radius) and potential differences (even from building to building between safety grounds to which components are connected). APC ProtectNet PDigiTel is a digital telephone surge protector. It protects digital phone lines used by T1 DLL ISDN and other digital telecommunication equipment. Primary InformationPower Device Type : Surge suppressor Surge Suppression : Standard Power Device / Form Factor : External Interfaces & Connections : 1 x modem - ISDN PRI T1 - RJ-45 Country Kits : Canada; France; Mexico; Australia; United States; United Kingdom Enclosure Color : Beige Width : 1.9 Inch Depth : 1.1 Inch Height : 4.1 Inch Service & Support Type : Limited lifetime warranty Special FeatureRoHS : Yes UNSPSC CodeUNSPSC Code : 39121610 Product IDUPC: 731304013877Manufacturer Part: PDIGITEL