Depends on what is causing the link to drop?
If it s caused my a burst of noise for example then yes, it could be considered acceptableas BT cannot control external influences.
If it is faulty external wiring - then it could be unacceptable.
What about the modems? Yours or the one in the DSLAM - if it is your modem then from an ISP perspective it is acceptable, however if teh DSLAM modem is causing it, then maybe not.
M H C
taurus excreta cerebrum vincit