fibeoptic broadband and interleaving

was wondering if fibreoptic broadband by bt has interleaving or fastpath
and if its possible to either turn it off(interleaving)
or turn it on(fastpath)

as far as know i will have FTTC soon

any help appreciated

Broadband via fiber such as virgin i would imagine don't use interleave, but this is bt your talking about, i believe that they do use their DLM so they may also interleave it by default, but you should be able to get them to switch it off, but the dlm may wrongly detect issues and it may well get switched back on automatically , i would suggest ringing them to find out, but i doubt that most of them wouldn't have a clue what it was ,lol