What is the pin out for a T1 crossover cable? Cisco Forum FAQ| Table C-1 T1/E1 Connector Pinouts using RJ45s Pin Number Signal Name 1 ----- RX ring 2 ----- RX tip 3 ----- RX Ground 4 ----- TX ring 5 ----- TX tip 6 ----- TX Ground 7 ----- Not used 8 ----- Not used Connect pin 1 to 4, 2 to 5, and 3 to 6. Courtesy of yaplej. by yaplej edited by aryoba | ||