We have 2 routers with E1 interface.
We want to make E1 cable with RJ connectors
The wire 1, 2 is using to transmit the data and wire 4, 5 to receive the data. Because we connect the 2 routers directly we have to cross the cable.
One side use 1,2(wire) as TX and 4,5(wire) as RX , the other side use 4,5(wire) as TX and 1,2(wire) as RX
refer to Handling Process
Making E1 cable is very easy you have just to Know the transmitter and receiver wire.