The kit in the cabinet can sync "on the fly" so it doesn't actually drop sync long enough for the PPP to drop.
As it's the PPP session (hub logging you in) data that picks up the line speed from the cabinet on the way to the RAS (to get the IP address) it's possible for your sync to drop (or increase) but the profile not be changed (as a new session hasn't been started, so therefore the current sync speed wouldn't have been picked up and given to the BRAS)
I think that makes sense!!
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