T1 is a differential communications interface using two pairs tx and rx connected through a single rj 48c connector also frequently written as rj48 rj 48 or rj48c and also often incorrectly called rj 45 or rj45 it is an rj connector with 8 contacts assigned according to specification rj 48c. The complete ethernet pinout cable wiring reference with wiring step by step guide. T1 e1 j1 rj48 cable diagram the following illustration provides the wiring connections for straight or crossover cables. 
				
			
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