In some scenario E1/T1 DB100 to RJ48 Port Conversion Box is used between CX600 and DDF.Usualy E1 or RJ45 cables are patched in DDF, but :
How can we patch RJ48 on DDF?
1.For CX E1 cables, use X2 connector and cut off the other side
2.For the connector X2, Pin 1,2 and 4,5 are used. 1, 2 is white and green, they are twisted as 1 pair, this is the RX of the CX E1. The 4,5 are white and blue, they are twisted as another pair, this is the TX of CX E1.
3.There are 4 pairs in one cable, but the other two pair are not used.