So the reboot of the router was probably irrelevant?

In reply to a post by RobertoS:

So the reboot of the router was probably irrelevant?

Not at all - the IP profile would not have increased had I not rebooted the router.

Are you saying that until you reboot the router the results of a BT speed test don't show the changed IP Profile?

That's right, you need to disconnect and reconnect the session to get a new profile and a "spontaneous" modem resync will not normally do that. It's the same if it resyncs lower, you can get. an IP profile higher than the sync speed.

?
On OR DLM with WBC IP Profiling generated from it, (and in fact on WBC ADSL2+), the BT IP Profile changes immediately the modem sync's at a different speed.

Your reboot of the router has no effect on that. I thought you meant the PPP disconnection from rebooting the router would cause the PN system to refresh immediately from the BT profile, but it seems it didn't.

There is the bit we are still only guessing at, which is what BT database also gets updated with the WBC IP Profile, and when, as it is the feed from that database that updates the PN copy. It's somewhere in the WBC >> unknown >> PN feed >> PN update path the problem lies. So maybe the PN line rate was refreshed from the unknown, but that hadn't updated at that stage.

... if it resyncs lower, you can get. an IP profile higher than the sync speed.

That was the case on the original 20CN DLM, and earlier versions of the WC one, as they took up to 75 minutes to register the sync change. Normally they took far less than that.

The current WBC DLM reacts immediately in either direction.

Whatever is going on behind the scenes, the reported BT IP profile, and I don't mean Plusnet's copy, does not change until you disconnect and reconnect the session and this has been documented several times here.

Does this apply to FTTC which is what is being referred to.
I must admit that this is the first time I have seen this reported

I've not seen that, here or elsewhere, unless I'm having a serious senior moment. Proving it either way isn't made easier by the current malfunctioning of the BT Wholesale speed test though.

Ahhh, I might have an explanation, but t'other half has just stirred upstairs, so time to take us both tea in bed.