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[dee.jay]

QoS is an upper layer traffic mechanism - it will have no bearing on the sync rate.

[Alex Atkin UK]

Ping has also dropped in half - used to be around 18ms, now see as low as 7ms, which I guess is exchange work for FTTP.

If you're still on Zen its more likely you were on Manchester gateway and randomly ended up on London.

AFAIK FTTP backhaul is completely different to FTTC, so upgrading for FTTP should make zero difference to FTTC.

[bottlerocket]

QoS is an upper layer traffic mechanism - it will have no bearing on the sync rate.

Yes, and, as I noticed last night, the cheap fixed line phone handset has been unplugged, which seems a more likely culprit! 

If you're still on Zen its more likely you were on Manchester gateway and randomly ended up on London.

This seems to be the case - traceroute shows transit via london routers after leaving my router. A nice bonus.

[Weaver]

Is the change in ping time to do with G.INP parameters changing? Can you see those stats?

[j0hn]

AFAIK FTTP backhaul is completely different to FTTC, so upgrading for FTTP should make zero difference to FTTC.

Did you mean to say that? It's different so makes no difference?
It depends on the backhaul provider but generally the backhaul is identical between FTTC & FTTP.
The only difference in latency between the 2 is what is added by the DSLAM.

Is the change in ping time to do with G.INP parameters changing? Can you see those stats?

G.INP adds no delay.
It's INP+Interleaving that adds a minimum 8ms on FTTC.

[dee.jay]

Yes, and, as I noticed last night, the cheap fixed line phone handset has been unplugged, which seems a more likely culprit! 

Ah yes, a far more likely candidate indeed

[Alex Atkin UK]

Did you mean to say that? It's different so makes no difference?
It depends on the backhaul provider but generally the backhaul is identical between FTTC & FTTP.
The only difference in latency between the 2 is what is added by the DSLAM.

I must be confusing something else, I was thinking FTTP and FTTC have their own backhaul.  I was likely thinking of some other part of the chain that I can't think of the name of right now.