My ISP, Andrews and Arnold, gets notifications from BT telling them that the downstream (and upstream?) speed of a line has changed. I’m assuming that TalkTalk wholesale does something similar. Does anyone have any idea how this works?
I was wondering about G.Fast. Since that has SRA, for the first time for BT, I wonder if dynamic speed-changed events get sent to the ISP in the same fashion. With pre-SRA DSL, BT sends notification events to the ISP when a PPP link connects (or when a DSL link goes into the ShowTime state) so there has not been a case in the past where dynamic rate changing message have been delivered quickly. Am I correct?