Tripp Lite Datashield In-Line Surge Protector for Network and Digital/Leased Lines, T-1, ISDN, 1-Set RJ11/45/48, (DSUT1CSU) POWERFUL SURGE PROTECTOR FOR NETWORK AND DIGITAL/LEASED LINES: Ideal for the protection of sensitive "U" and "S/T" interfaces on modems, NT1 devices, CSU/DSUs, terminal adapters and other pieces of high-speed equipment. COMPLETE T1 AND ISDN (RJ11/45/48) SURGE PROTECTION: DSUT1CSU offers full surge suppression for CSU/DSU's and other high speed equipment on digital and leased lines, T1 and ISDN interfaces. RJ45 CONNECTION: Convenient RJ45 input and output connections make for simple installation (RJ45 input/output connections, pins 1-8, 60V clamping). COMPREHENSIVE PROTECTION: Protects against the effects of electrostatic discharge, faulty wiring and lightning LIFETIME LIMITED WARRANTY: This In-Line Surge Protector offers a Lifetime Limited Warranty.