Yes, this is normal. Up to 20% of lines are exchange lines, meaning they go back to the exchange without being fed through a cabinet. Normally this makes no difference for phone and ADSL services, but of course for FTTC, it means that FTTC cannot be provided, because there is no cabinet involved.
Due to restrictions it is not currently possible to offer FTTC direct from the exchange instead of a cabinet. You could of course be fed from a cabinet but one that is not being upgraded. Openreach survey every single cabinet to see if it both commercially and technically viable to offer FTTC, so if its not going to provide enough return to their investment they will not enable it.
Most lines that are close to the exchange are not deemed as viable as those further away because customers are already able to receive a decent speed as they will be on a short line.
PM me your postcode and I will find out your situation.
Technical Director, ADSL24
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