Training on a new line?

Hi peeps.
My TTB Pro service with Xilo (up to 2.5 up) was activated today on a new line but after taking a look at the stats, I'm surprised to see it sitting on ADSL1 rather than 2 or 2+.

I would start screwing around with it (reboots, filters etc) but this is still day 1. Is it best left alone for now? I know "training" existed in the old days but does it still apply to LLU? I'm also wondering if the noise margin is a bit small considering the sync speed and attenuation...

adslctl info --stats output: http://pastebin.com/eTCgLvs4

Cheers.

Max sync for adsl mode needs provider to confirm adsl2+ is enabled on line and your modem is in multimode or adsl2+ mode

Thanks for the insight, Andrew. I went ahead and reset the different modes on the modem to default (the only difference being that "multimode" wasn't selected anymore). It's now using ADSL2+ as expected. http://pastebin.com/ykLZf5yi

Guess it threw a wobbly? It's a DG834GT running the DGTeam firmware so it's getting on a bit...

Edited by deleted (Wed 20-Aug-14 20:49:14)

Thats better presume you opted for annex m better uploads speeds. Though only a marginal improvement at that line length

Annex M does make some kit throw a wobbly at times

Indeed. There was no active telephone line so I was reliant on speed estimates by address which were very optimistic at around 15mbps so I was hoping to benefit from annex m a little more. The check by phone number (now that I have one) is bang on at 10mbps. I'll look into getting interleaving enabled.

Strangely, Xilo have just emailed to say that my order is delayed!

Annex m will have cost you some download speed to get the extra upload

So which is more important?

& you may be getting only 0.1 - 0.2 Meg extra upload whilst you could be getting 13 Meg download on Annex A.

EDIT: Omitted the decimal point in upload.

Edited by XRaySpeX (Thu 21-Aug-14 03:21:19)

I want to be running a mail server from home so any extra upload bandwidth is welcome, even at the cost of download. There are fairly near dates for FTTC in the area so I'm hoping this is will only be temporarily otherwise I'll be investigating line bonding.

Xilo have realised the line's active and I've put in a request for interleaving to be enabled. I'll also try disabling annex m on the modem for comparison out of curiosity.

Thanks, gents.

I've never heard of anyone disabling Annex M in the modem, as that doesn't disable it at the DSLAM. It may cause the DSLAM to train down to proper ADSL2+, but maybe the modem merely loses the extra upstream bins and they don't get re-allocated to the downstream.

At below 16Mbps Annex A downstream changing to Annex M (which has to be enabled by the ISP) will lose ~2.5Mbps downstream wuth a tiny increase in upstream. At a guess, a 15Mbps Annex A would not give any upstream increase on Annex M.

Edited by RobertoS (Thu 21-Aug-14 22:41:18)

It may also cause the line not to sync at all.

Some TTB profiles for Annex M are Annex M only. If you attempt to set anything else on the modem side, it won't work at all.

Matt

Yes, spot on, Matt; it wouldn't sync without it. I wrongly assumed it would drop down to the next best supported one.

Interleaving has now kicked in. I'll probably try and fiddle with the SNR slider on the modem in the future to try and squeeze a little more downstream out of it.

In hindsight, it wasn't really worth opting for Annex M on this line. I knew it would impact downstream speed but I didn't expect the gains to be so small.

FTTC us coming in the next couple of months hopefully so I'll stick with it for now! Think they've had issues with where to put the cab.

On FTTC:-

Note : It is the DLM system that sets the line profile, and this should not be interfered with by CPs/users setting rates, SNR margins etc. at the modem.

From Openreach SIN 498.

It doesn't work if you do, anyway. I tried it once I'd unlocked my Openreach modem, before that note was there, and it messed things up. It didn't behave at all like playing on ADSL2+ did.

Edited by RobertoS (Fri 22-Aug-14 22:18:47)

But he is on ADSL...

Matt

Oh, this is on ADSL2+ Annex M rather than FTTC. I can't get FTTC yet.

Yep. I added the first line when I remembered that. It was worth leaving the post in case he thinks of trying it on FTTC.

I don't think it is anywhere near as common on FTTC even if DLM does cobble you more.

Most are very happy with the natural speed increase.

Matt

There were reports that on some of the third-party modem/routers it does work. But the HG612 doesn't like it. Though I haven't got the latest firm/software in it.