whilst i agree zen should be able to do what you ask.

your splitting hairs over a few ping and from my own experience of online comp play you need to suck it up and practice more or change how you play. my opinion unless you are at the very very top of the game you play.

out of interest what game/s do you play? do you play for money online?

dipending on the game, being at a disadvantage can make you a beter player.

In reply to a post by Chrysalis:

you confident aaisp would fob him off also?

AAISP is no different. They advised exactly the same thing to me, when my FTTC line went south a few days ago. BT Openreach got the line fixed again within hours, but in the early hours of the following morning, I clocked on the AAISP metering graphs that interleaving had been switched on (the fault had probably made the DLM twitchy). I called them up about it and got exactly the same explanation as Zen have already provided the OP.

Thankfully, after leaving it alone, my line switched back to fastpath after 2 to 3 days, so it's now normal again. But I admit it is annoying not having this level of control, and it being left in the hands of the DLM at the cabinet, which only a BT engineer can change.

I think people need to be more aware of these caveats between different types of services before signing up. If latency is such a big deal to the OP, maybe a bonded ADSL2+ solution with an LLU provider or what not would have been a better choice than FTTC.

well here we are several weeks later MAC code in hand BTW speed test shows 75mb down 12 up which has dropped from previous 17 well 16.9 interestingly ping shows as 44ms so it seems interleaving is still well and truly on how it can be with that quality of line bear in mind its all brand new i will never know, as several have posted i think zen could flag this as a DLM error and have it reset but it seems it may not be policy, i did take the trouble to contact Richard Tang about this and he has responded that he will look into it and see what can be done so watch this space, pings to our NL server are still 36-44-52 which when your playing against players with 12-16ms makes a big difference i dont care how good you are or put it another way by the time i see another player he has shot me bit frustrating to say the least.

interesting but I know a few guys on aaisp FTTC. One had the same issue and got a different reply, engineer was sent out, and aaisp spoke to engineer on phone (after engineer played dumb on arrival), then the profile got reset. Openreach tried to charge, aaisp disputed it and charge removed.

I knew this prior to making my previous comment.

Yes its hassle for isp's but hassle does not equal not possible.

Edited by Chrysalis (Mon 27-May-13 10:34:55)

I suppose this is like most things in life - make enough noise about it and people will care enough to sort the problem out. Shame it has to be this way nowadays.

Of course, I never said it couldn't be done. But as you've just advised, a full-on BT engineer needs to physically visit the cabinet to do it, unlike ADSL* services where it can be done remotely by the ISP at the exchange. I'm not surprised BT try and charge for that, so I'm impressed with AAISP in the case you speak of. I suspect there was a genuine fault on the line (again, blame pointing at BT) which is why AAISP managed to have the charged dropped. Nicely done!

Feb this year i changed router because i wanted a 5ghz wireless as my new devices had the capability and i wanted the extra bandwidth

I note you changed the router and that is when this problem started happening. Have you tried reverting back to your old router for a few days to see if the DLM in the cabinet switches the line back to fastpath? I suggest you try this. I presume you've performed all the other standard tests like the quiet-line test for possible noise on the line?

From all that you say, this is the only thing that has changed. And this is when the DLM started to apply interleaving. At the moment, my finger points to your new modem, not any fault on your line.

no interleaving was added 3 days before i opened this thread the only difference in the two routers is one has 5ghz one hasnt, same brand etc that and the fact i set it to connect on demand ie if the conn isnt used for 15mins it logs off and goes to sleep interleaving wasnt added for at least 2 months after the new router the only possibility zen can see is the fact i set it for connect on demand, irrespective of this the modem is always on anyway and is between the router and the wall socket, we had 3 power failures a couple of weeks before all this started due to local road works damaging a cable but apart from that no issues at all there really is no reason for DLM to step in so to me this constitutes a fault as i say MAC in hand so i will migrate unless its resolved, it seems BT is still screwing us all irrespective of whom you pay if this isnt a monopoly i would love to know what is!

Edited by cssuk (Mon 27-May-13 11:43:30)

Firstly lets get this straight. This is not a fault. It is interleaving and it is designed to work this way. It's on and it's keeping you connected without instability. It's doing the job right. It's working as it should. It's not faulty. End of that.

The way fibre works means that overtime as more and more people get fibre crosstalk becomes higher and higher between lines. This means that over time the chance of interleaving coming on is higher and higher.

It cannot be disabled without BT openreach coming out as stated. This is potentially chargable. BT have to come out as all of the lines and fibre cabs etc are BT openreach owned.

Interleaving will have come on due to some noise on the line. This could be as simple as an extra 20 customers getting fibre in your area, on your local cab, thus pushing your crosstalk up meaning that you can no longer support a stable line without interleaving.
This is not a fault. Interleaving is designed to kick in here and do the job it's doing.

As you can see short of the ISP removing all 20 customers in this case there is nothing they can do.

Yes BT openreach can come out and reset things. In the above case within a few hours interleaving will be back on as the 20 extra customers will not just vanish. The additional noise that caused interleaving (the extra 20 customers) initially would cause it again.

ADSL2 is slightly different. ISPs have more control and can put you on fast path & reduce the sync to compensate where necessary. FTTC is totally different.

BT is not screwing you. Interleaving is a fact of life on the current setup for FTTC.

You will often notice your sync gets less and less overtime on FTTC too. This is due to increased crosstalk overtime as takeup increases too.

ISPs do not guarantee an interleaving free line on FTTC. You could go with any ISP and it would still no doubt be interleaved.

In reply to a post by ukhardy07:

The way fibre works means that overtime as more and more people get fibre crosstalk becomes higher and higher between lines. This means that over time the chance of interleaving coming on is higher and higher.

Never considered crosstalk over time. You make a good point there.

However, this then begs a question. If latency is important for some people, who-o-why do BT put everyone on the same standard FTTC profile (full-sync) and then rate limit at their equipment? (for the 40/10 connection, in my case). If the thing only synced at 40/10, it could probably operate fully at this sync speed without the need for interleaving, even with 20 more people coming into the cabinet generating cross talk. Instead, they choose to make the line sync at the maximum possible and then rate limit to create their 40/10 connection. Seems backward to me.

my oh my arnt you the tender one!

i know and understand how and why interleaving works, on poor connections its valid and has its good points on A1 connections ie 75 yards from my cabinet with a brand new line and what can frankly be described as perfect connection ie 75-83 MBs down and 17 up why do i need to have it ? AND why do i need to involve OR to maintain my ZEN connection read the whole thread and absorb thye reason for my complaint before you get all uppity please there is no need for DLM on my connection its perfect the DLM i suspect is broken which echoes a huge swage of complaints on the BT infinity 2 forum btw