I seriously doubt Fastpath is available on anything other than "Speed".

I'm sorry, but if you want to contradict yourself, don't blame me.

Reminder about the reality of DLM on Openreach FTTC

Explains some of the basics as to how DLM on FTTC works, As said it's all about error rate thresholds, I have read about cases where DLM has eventually applied banding and removed interleave, leaving them with a slower speed , and a lower ping

It will be a reason why all FTTC connections start off with DLM in wide open mode

Batboy, I'm 100% sure you have this wrong, and I'm sure someone like WWWombat will be along tomorrow to explain.

Interleaving is applied if your line is experiencing errors, if you have very little or no errors you will be on fast path, regardless of the profile.

If the errors increase then interleaving will be applied, now it makes sense to me that these trigger levels are different for the three profiles, stable, standard, and speed. With each one of those profiles allowing slightly more errors before interleaving is applied or a higher level of interleaving,as there are many levels of interleaving.

I'm also going to leave it as that.

Thanks Tommy45,

In all three modes the system will tune the connection, setting fast or interleaved mode for error correction and once in interleave mode vary the depth of interleaving, the deeper the interleave the more tolerant the line is to errors at the expense of increasing latency and some throughput speed.

Which clearly implies all profiles can be either fast path or interleaved depending on the level of errors.

Unfortunately, Forward Error Correction needs Interleaving to be applied before errors happen and this can only be so if the line is not on Fastpath. Therefore a "stable" profile requires Interleaving not Fastpath.

Edited by deleted (Mon 21-Apr-14 15:56:57)

Well the "wide open" setting that is used at the start or following a DLM reset by an engineer or changing from 40/10 to 80/20 apparently causes a DLM reset too,
That starts out using fastpath, IMO the differences between the dlm profiles is that the stable error threshold will be the lowest out of the 3 , and the number of resync's it before it would deem as a fault would again be the lowest number out of the 3 profiles
The stable profile may also be the least likely to ever restore fastpath , it may also reduce sync in bigger chunks and apply deeper interleave levels ect than the other 2 So be seen as the most aggressive

The speed profile should have the highest error rate threshold out of the 3 and if it did apply banding being on this profile should provide the greatest chance of removal of interleave,
So being on this profile may offer some advantage if your line is affected occasionally by REIN or is affected by increasing levels of crosstalk , in that it would presumably be the last profile to intervene ,but the first to remove interleave , the increments that dlm increases latency by may differ to between profiles

The standard profile will as as described a balance between to 2 , somewhere in between ??

Edited by tommy45 (Mon 21-Apr-14 16:15:50)

In reply to a post by BatBoy:

I'm sorry, but if you want to contradict yourself, don't blame me.

Where's the contradiction?

In reply to a post by Hoolay88:

In reply to a post by BatBoy:

I'm sorry, but if you want to contradict yourself, don't blame me.

Where's the contradiction?

http://forums.thinkbroadband.com/fibre/t/4323569-pin...

i still dont see where i contradicted myself, its pretty clear, the DLM itself will decide if and how much interleaving to apply/not to apply from the live data it reads from the individuals connection, the DLM PROFILE does not determine this, only the threshold.

Please read carefully, hopefully this explains it clearly for you.