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Pins 1, 2, 4, and 5 are connected to 4, 5, 1, and 2.
A T1 cable uses pairs 1 and 2, so connecting two T1 CSU/DSU devices back-to-back requires a crossover cable that swaps these pairs. Specifically, pins 1, 2, 4, and 5 are connected to 4, 5, 1, and 2, respectively.
1 > 3, 2 > 6, 3 > 1, and 6 > two
A crossover cable is used to connect a computer to another computer, a hub to a switch, a hub to another hub, a switch to another switch, and a router to another router. The Crossover cable has eight wires inside the cable shield and two RJ-45 connectors at each end. In the crossover cable, two sets of wires are crossed over. The correct pin mapping of an Ethernet crossover cable is 1 > 3, 2 > 6, 3 > 1, and 6 > 2.
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