This is related to my other post with 3dB margins/noise issues on 2 lines but as this is a specific question I thought it was more suitable to a new post. Apologies if not.
Does any one think the following could cause issues?
[ BT junction box for whole building of offices (no one else having issues, I've asked around) ] --> single CAT5 cable --> [ BT wall box with 2 telephone sockets in our office ] --> [ Micro filter in each socket ] --> [ router in to each filter ]
Down this single CAT5 cable (all done by BT - I questioned it when they did it) they have wired 2 phones lines, each running their own ADSL service.
Could this cause interference issues for the ADSL connections? Yes the pair for each line (the other 2 unused) are twisted but there's no shielding between them, so could they could 'leak' in to each other and cause noise/interference issues that we are seeing?