Tripp Lite's 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 3-ft. (0.91 m) 5-ft. (1.52 m) 7-ft. (2.13 m) and 10-ft. (3.05 m) lengths. Custom lengths available...consult your reseller. Also available in Straight-through wiring configuration...see Tripp Lite N265- Series T1 patch cables.N/AN/AANSI certified T1 cable Levels 1 1A and 1CN/AComplies with ANSI T1.403 Carrier-to-Customer Installation-DS1 Metallic InterfaceN/ACross-over T1 wiring configurationN/AAvailable in 3-ft. (0.91 m) 5-ft. (1.52 m) 7-ft. (2.13 m) and 10-ft. (3.05 m) stocked lengthsN/ACustom length cables availableN/ANEC (UL) Type CMRN/AAvailable also in Straight-through wiring configurationsN/A22AWG Solid Tinned Copper