TRIPP LITE's N265-010 T1, RJ45 – RJ45, (RJ48C) patch cables are constructed with premium Quabbin 9720, T1 certified cable. Two (2) individually shielded, #22 AWG, 100 Ohm pairs, maximize the performance of your expensive T1 circuits and equipment. Beware of generic T1 patch cables made with inexpensive CAT 5 unshielded patch cable. The American National Standards Institute (ANSI) states in ANSI T1.403 that T1 cable is constructed of two (2) balanced pairs, #22 AWG solid conductor, 100 Ohm impedance, with a loss budget of 5.5 dB straight-through wiring configuration available in 3 ft, 5 ft, 7 ft, and 10 ft lengths. Custom lengths available . . . consult your reseller. Also available in crossover wiring configuration. See Tripp Lite's N266-Series T1 patch cables.