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[tommy45]

Just been migrated to Zen's GEA FTTC from BT wholesale , Why the resync ? I'm on fast path But i have lost 9mbps  and G,inp  why  the resync if Zen use the Speed  DLM profile ?

Latency is 1ms lower to Tbbqm , but higher to a gaming server in the usa, My link used to route to the usa via their manchester peering now it's via bloody London not impressed bout this at all

[cliver]

As far as I know any change of ISP will need a resync and a "new" DLM profile. So you will have to go through the training period again. Hopefully your line will settle back to what it was but it can take several weeks. I recently changed from TT to BT and it took 2 weeks but then my line settled back to what it was before I changed. Ping seems to improve once G.INP kicks in as well but you might not get exactly the same back as it's now routing differently. Time will tell and unfortunately it's a bit of a waiting game.

Sent from my Nexus 6P using Tapatalk

[NEXUS2345]

Just to clarify some things, Zen FTTC is mostly provided through BT Wholesale still, unless you are connected to an exchange that has Zen LLU. Also, FTTC has no training period of any sort. DLM takes hold after 12-24 hours but otherwise there is no training period for DLM as there is with ADSL.

The most likely thing is as said above, due to the change of ISP, DLM has gone and done a reset and introduced Interleaving+FEC, which means your speed may have gone down and latency increased. Assuming you are on a Huawei cabinet, this should be replaced with G.INP at some point, giving you back your previous speeds. However, if you are on an ECI cabinet, assuming good line quality, you should get moved back to fastpath and have Interleaving+FEC removed.

We can confirm these things by getting you to give us what exchange and cabinet you are on through this site: https://www.btwholesale.com/includes/adsl/main.html

And if you could also post any statistics from your router that would also allow us to see if there is an issue present. If you have an old BT Openreach HG612, or a ZyXEL VMG series (I believe Zen provide these now) you can unlock it and use DSL Stats to harvest data which can be uploaded to MyDSLWebStats for us to see a more clear picture.

[tommy45]

Sorry if i wasn't clear enough in my 1st post, But i have not migrated between ISP's I have been with Zen for over 12mths now, this was a Migration of same Openreach product type IE 80/20 FTTC from the BT WMBC platform (BTwholesale) GEA (via Zen's LLU) so a change of Backhaul only hence my question why the need for a resync and what appears to be a reset of DLM , but a closer look at the stats if this was a complete DLM reset then why has by spare Upstream SNR increased but the attainable decreased? it makes no logical sense , and my connection has been G.inp enabled for a long time now, over 2yrs and there was no resync when i did migrate ISP's from Plusnet to Zen , again same Open reach product type and same address, but was WBMC to WBMC backhaul ,

Also with FTTC there is no such training period , you get or a supposed to get whatever speed the line is capable of on the first day, only if the error rates are outside the threshold will dlm intervene , One possibility is that they have changed the DLM stability profile in error from speed to one of the other less tolerant profiles , and looking at my ds error second rate it won't be long before DLM does something , i just hope it doesn't add interleave

The routing also got changed for some reason , as i live in the north-west area of the uk , i have since migrating to zen over 12 mths ago, always been routed via their manchester's data centre, for everything, and i peered from their to the USA , this gave a lower latency to several gaming servers ,
But not all going via London which is IMO a dumb idea
I have since found that zen infact do have GEA handover at my local exchange , so there's no reason to route via London apart from someone's laziness maybe

[cliver]

My experience, and I believe others, is that a change of provider leads to a period of settling (call it what you will). In my case it took 2 weeks to get back to where I was when I changed isp. I know others have had similar experiences.
Although not sure how/if this applies in your situation.

Sent from my Nexus 6P using Tapatalk

[tommy45]

My experience, and I believe others, is that a change of provider leads to a period of settling (call it what you will). In my case it took 2 weeks to get back to where I was when I changed isp. I know others have had similar experiences.
Although not sure how/if this applies in your situation.

Sent from my Nexus 6P using Tapatalk

Wasn't a change of provider  just backhaul  from BTW handover to Openreach GEA handover  and in the past  when i migrated from PN to Zen  both using BTW  WBMC backhaul  no resync  only as you would expect PPPOE session drop , as ISP changed , so maybe it's a case that when the migration involves a change such as backhaul (data transit) this triggers a dlm reset = resync  So say you migrated from BT or btw provider to Sky or tt who have their own network and GEA cable links so that your data transits onto their network and not bt's  or vice versa,

Apart from that  the only other instance apart from change of supply address or change of product speed or if the isp uses a different DLM stability profile by default  from the previous ISP's choice

[Sheepie]

I have just had the same migration happen to me overnight (Zen openreach->GEA) and the exact same thing, resync, GINP removed and I am on fastpath up and down, SNR margin on upstream went up by 3db and went down on the downstream by 3db resulting in a much lower attainable sync rate for downstream. Looking at the amount of error seconds I am pretty sure DLM will do something.

tommy45 - did the DLM eventually put you back on GINP? How long did it take?

[kitz]

>> Wasn't a change of provider just backhaul  from BTW handover to Openreach GEA handover

In the eyes of Openreach that is a change of provider.  Although everything at the cab will remain the same, you will be on a different cablelink at the OLT.

[tommy45]

I have just had the same migration happen to me overnight (Zen openreach->GEA) and the exact same thing, resync, GINP removed and I am on fastpath up and down, SNR margin on upstream went up by 3db and went down on the downstream by 3db resulting in a much lower attainable sync rate for downstream. Looking at the amount of error seconds I am pretty sure DLM will do something.

tommy45 - did the DLM eventually put you back on GINP? How long did it take?

Yeah G.inp was re-enabled after 5-6 days iirc but i still have lost a few Mbps sync  which i think is down to an underlying line fault ,

Even worse still i may end up being migrated back onto BT WBMC  again, as i have the Single threaded throughput issue where it will not max out or even if it peaks at the max rate for the sync it then drops a lot,  even at 4am it still isn't working as it should, Then there is the question why they routed my exchange to london when  they have a data center and gateways at manchester ,which even has surprised some of the tech support staff at zen  they are at a loss  as to the reason also , it doesn't make any sense to me,  and if they had of kept the routing to manchester i wouldn't have this single steam issue
One of the better results i have had http://www.thinkbroadband.com/speedtest/button/148045569918686669009.png

[Sheepie]

I am also routed via london now, which is stupid since I am in the north west.

Today the DLM put me on interleave and so added a load more latency, which is exactly what I did not want to happen. No idea why I'm interleave since the stats on fastpath show error seconds easily within the "amber" range, and I was G-INP previously so if errors were detected why not just enable G-INP?

So, considering most of the use is for online gaming, I might as well go back to ADSL2+. You would really think BT would have a profile for people who want minimum latency, even if that means lower sync rate.......

Within the space of 4 weeks my DS sync has dropped from 80kbps to 62kpbs and latency increased from 16ms to 32ms.... not great after 18 months of stable connections.

MyDSLWebStats user = Sheepie

[tommy45]

Well  i have been migrated back on to BT's WBMC and as expected another DLM reset , and fast path profile,  sync down to just over 70mbps  even though there was 0.4db headroom , this migration took place shortly after 12 midnight and although i had sync  the router couldn't auth until i rang them and someone on their networks team sorted it,

But i still have this single thread issue which has followed me , and as i didn't have this before the switch to GEA  it has to be something they have managed to bork their side So 2 weeks of a degraded service  followed by 8.5 hrs without internet access, woeful service there from zen,

As for the HR fault ,Zen claimed that they were unable to run the CIDT test because they aren't my phone (PTSN)provider, which i didn't believe, but later, after making further enquiries into this  i found it to be true, So i asked my PTSN provider who was helpful and said that even though it wasn't affecting the voice  they would run the tests , Why did Openreach devise a test (CDIT) roll it out to nearly all exchanges but prevent ISP's running that test if they don't provide your PSTN service as well, because back in 2011  when they launched this test  there were not the amount of isp's selling overpriced bundles as there is now, it makes no sense at all, unless they don't wish to be run off their feet with faults?

[Sheepie]

You may have been better off sticking with GEA for a while. Your graphs already show latency on WBMC and it's not even peak time yet.

I was being moved to a different circuit every few months when on WBMC, I feel for the people do not monitor their connection and get left behind on congested circuits, almost unusable in the evenings.

It's only going to get worse - my kids have stopped watching normal broadcast TV and all they do is stream from netflix, bbc, etc, nearly 300 GB per month! if everyone is doing that the current circuits are all going to be overloaded.

[tommy45]

You may have been better off sticking with GEA for a while. Your graphs already show latency on WBMC and it's not even peak time yet.

I was being moved to a different circuit every few months when on WBMC, I feel for the people do not monitor their connection and get left behind on congested circuits, almost unusable in the evenings.

It's only going to get worse - my kids have stopped watching normal broadcast TV and all they do is stream from netflix, bbc, etc, nearly 300 GB per month! if everyone is doing that the current circuits are all going to be overloaded.

Probably down to me  running speed test's lol,  In the past 12mths i have had peak time issues twice, and they swapped the vlan  both times, Thats BT for you, they either don't monitor their network properly or the deliberately  allow SVLANs to become overloaded or get too close to capacity
I didn't ask to be moved back  or to be migrated in the 1st place  the wholes thing from the start has been a disaster and is still crap now

[Chrysalis]

Move to a TTB provider tommy or sky.  Problem solved then.

[tommy45]

Move to a TTB provider tommy or sky.  Problem solved then.

I would but, sky don't provide static, and pander to the music and film industry like the other big 4-5 isps web blocking /porn filter ect ect,
And charge the earth for line rental
 the only tt reseller that could provide what i want is AAISP and they are too expensive for the data usage imo , well for my budget anyways,
Plus there is still this line fault,  then there is peering and how they route things  min base latency