Tripp Lite 10ft T1 RJ48C Shielded Cross-Over Patch Cable RJ45 M/M 10' - Crossover cable - RJ-48C (M) to RJ-48C (M) - 10 ft - shielded - beigeTripp Lites T1, RJ45-RJ45, (RJ48C) cross-over patch cable is constructed with premium Quabbin 9720, T1 certified cable. Two individually shielded, 22AWG, 100ohm pairs, maximize the performance of your expensive T1 circuits and equipment. Beware of generic T1 patch cables made with inexpensive Cat5 unshielded patch cable. The American National Standards Institute (ANSI) states in ANSI T1.403 that T1 cable be constructed of two balanced pairs, 22 AWG solid conductor, 100ohm impedance, with a loss budget of 5.5db.