Tripp Lite T1 Shielded RJ48C Cross-over Cable (RJ45 M/M), 3-ft. (N266-003) ANSI certified T1 cable, Levels 1, 1A, and 1C Complies with ANSI T1.403 Carrier-to-Customer Installation-DS1 Metallic Interface Cross-over T1 wiring configuration Available in 3ft, 5ft, 7ft, and 10ft stocked lengths Custom length cables available