Hi All,

Is this Common E1 Line Faults below the same with yours?

If not, could you let us know the differences? Then we can improve the document. 

Many Thanks!

 

Fault	Identification Method	Rectification Method
An E1 line deteriorates or a connector is not securely installed (for example, wire seating is not firm on the distribution frame).	Check whether the line is exposed. Check whether the connector is rusted or wire seating is not firm.	Replace the line or perform wire seating again.
An E1 line is improperly connected.	Check whether the transmit and receive ends of the line are correctly connected. Check whether the 75 ohm E1 trunk cable is grounded.	Correctly connect the transmit and receive ends of the line. Ground the shield layer of the 75 ohm E1 trunk cable. The 120 ohm E1 trunk cable does not need to be grounded.
A loop occurs on E1 lines.	Check whether the two wires of an E1 line are directly connected.	Disconnect the loop and properly connect the lines.
Interference occurs on an E1 line.	Check whether a strong interference source is around the line.	Remove the interference source or reroute the line.
An E1 line is incorrectly configured.	Check whether clock configurations are consistent on the two ends of the line. Check whether port mode, signaling mode, and CRC4 attribute are consistent on the two ends of the line. CRC is the acronym for cyclic redundancy check.	Configure port attributes on the two ends of the line according to data plan.