How are you testing the latency? as ping to each different address will differ ,so 11ms to what ? it also is Dependant on several other factors too
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By pinging websites at the command line. I use the bbc as a baseline which is what the figures in the OP are based on but I also ping others aswell to make sure it's not just pings to the bbc that are changeing.
That sounds like a wholly inefficient way of working a DSL standard (to only allow a sync increase via an engineer visit).
Does that mean when BT switch vDSL profiles (later this year, or early next year) we are all going to have to ask for engineer visits to get us synced above 40Mbps.
Sounds like a very expensive way of doing things.
I agree, you can see many many times on the BT forums peoples sync rate dropping and engineers being sent out who run tests then phone a number to get it reset. If there is remote management on the modem why not just run a remote test, if that is clear increase the sync rate then if there are problems that the remote tests have not picked up the DLM will just lower the sync rate again. An engineer can then be sent out to find the fault.
OR saw no faults on my line and instead of seeing that as a good thing and increasing the sync it was seen as a reason not too. Surely they have history of recent sync rates and such to go on aswell.
No, the sync is in no way locked. FTTC operates a DLM based on the Openreach platform (not BTW), but as with any DSL produduct (of which FTTC is being VDSL) its rate adaptive, so it will SYNC as high as it can based on a target SNR. Most lines never see this because they SYNC at 40000 anyway. But we have a customer in NI who syncs around 13-17Mb depending on the day and his line conditions. So completely variable and not fixed. Thats why the IP profile system still exists, so it can adapt dynamically to the SYNC event.
I agree it's not locked as in it is set and then never goes down, but I don't accept that it also goes up based on current line conditions, at least not for everyone. No matter how many times I resynced the IPProfile wouldn't go any higher becasue the sync rate was locked at 36 Mb. Support also told me that it wouldn't.
It seems like OR have stepped in in my case, I'm very doubtfull it would of rissen on it's own.
I'm hopeing there are no more maintenance windows anytime soon, or if there are and it causes another sync rate drop that it is below 30 Mb so I can get it raised quicker than 11 weeks.
Edited by Croftie (Wed 31-Aug-11 22:51:37)