hello, I have been trying to reconnect some folk to their talk-talk broadband today, and so far have not succeeded - but that is not why I am posting on here.

They tell me that they have had a particular problem both with Talk-Talk and the preceding ISP, which was BT, in that, if the phone rang and was answered ( mobile) their connection to the Internet was lost.

I had occasion today to see this happening. Although their connection to the internet has been lost for some days now, the home-side of the router seems to be working fine, and I was in a screen watching the Tx spikes being traced and progressing toward the left of the screen - and then the phone rang and I said to answer it as we didn't have a connection outside the router to lose, so they did answer the phone, and I saw all or at least several of the spikes changed from being spikes to being columns with a flat top, and all ending at the same height. I felt this had to be to do with why they lose internet connectivity ( when the darn thing is working that is) but I didn't understand what I was seeing. Can anyone explain please?