Depends on if you are changing /migrating from /to a different BT open reach product or not
BT openreach FTTC products are, 80/20 55/10 40/10 & 40/2 though a regrade from 40/2 to 40/10 and or 40/10 to/55/10 may not trigger a DLM reset , But going from 80/20 to any of the others would, same if is reversed Also which DLM stability profile is used by the loosing and gaining isp could also trigger a dlm reset to some point, as the MTBE is different for each of the 3 available stability profiles
Also quite why Openreach would carry out any work at a street cab for BTW to LLU migrations i don't know, as all that changes on the FTTC side of things is the handover onto the different GEA cable link at the exchange the PTSN side of things would be changed at the exchange too, but the port in the FTTC cab wouldn't be touched
Edited by tommy45 (Thu 21-Apr-16 20:02:58)