The Technical Problems of ADSL
Crosstalk, generally at the CO (known as near end cross talk (NEXT)).
- AMI T1 (shaped square waves) (0- almost 1MHz with high amplitude).
- ISDN BRI (0 - 40 KHz, with harmonics).
- HDSL (used to provision T1) (0-196 KHz, with harmonics).
Attenuation due to line length.
Attenuation distortion, caused by capacitive effects on line.
Bridge taps (narrow band attenuation).
Signal intrusion from AM radio (generally narrow band).
Loop characteristic drift caused by temperature change.