[[File:CQM-FTTC-DIS-in-one-leg.png|none|frame|FTTC running on just a single leg/wire]]
Here we have a perfectly good FTTC, running at 80M. However, in the evening the line goes rather crazy! Here is what happened:
*18:20 End user was doing some tidying up of wiring and accidental disconnected
on of the wires that make up the pair used for the phone line
**The line dropped a few times and reconnected, but the sync speed dropped to from 20M up and 80M down to 600K up and 23M down!
*The line continued working for a short while, up until: