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 0.91 m 1.52 m 2.13 m and 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. 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 Cross-over wiring configuration available in 0.91 m 1.52 m 2.13 m and 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. 22AWG 100ohm T1 Rated Cross-over Cable Connects your T1 CSU/DSU Meets ANSI T1.403 Cabling Requirement Package Includes1.52 m T1 Cross-over Shielded RJ48C Patch Cable