Tripp Lites T1 RJ45-RJ45 ( RJ48C ) Cross-over Patch Cables are 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. Cross-over wiring configuration available in 3ft 5ft 7ft and 10ft lengths. Custom lengths available...consult your reseller. Also available in Straight-through wiring configuration...see Tripp Lite N265- Series T1 patch cables. Tripp Lite Lifetime warranty.