They may be lucky and have very little cross talk in their area.

It being an Annex M service, it may be behaving a little oddly, and misreporting.

Edited by MrSaffron (Wed 30-Nov-11 19:16:47)

MTU tweaking is not really about raw speed, but more about some sites not working at all.

ADSL2+ estimates if the 28dB is correct are 14000Kbps to 16900Kbps for connection speed. So line is performing beyond expectations if the numbers are correct that you posted.

The throughput may be a factor of a router that does not support Annex M, i.e. the negotiation and data presented by the router on screen may be wrong.

I would recommend getting an ADSL2+ Annex M capable router running on the line, and see how things pan out.

Annex M sacrifies downstream speed to gain about double the upstream speed, and this may have confused a modem that does not understand Annex M. I have seen some ADSL2+ Annex A only devices not work on lines where Annex M is active.

My Annex M modem is in the post and should be with me tommorow.

I think I'm being penalised here, just changed the MTU and on re-sync ...

Downstream Rate: 18001 kbps
Upstream Rate: 1045 kbps
Channel: Interleaved

Speedtest result: 6.7Mb/0.7Mb

It was previosuly set to FAST, so I'm guessing DLM is doing something silly here? Looking at the modem stats, there has been 6 re-syncs in the past 24hrs (is this normal?)

Edited by deleted (Wed 30-Nov-11 20:16:19)

Based on the att. what would you expect in terms of speed?

18 meg or less. Are you aware that when you do hang an annex M router off of it you will lose more downstream sync rate to provide the increased upstream ?

In reply to a post by Zarjaz:

Based on the att. what would you expect in terms of speed?

18 meg or less. Are you aware that when you do hang an annex M router off of it you will lose more downstream sync rate to provide the increased upstream ?

Yes, well aware. I guess its worth waiting for my new modem, as anything with this one could just be producing erroneous results due to a lack of Annex M support.

Speed is down to 6Mb/0.6Mb - this is dire!

To think I'm moving from a 10MB/10MB leased line to Annex M ADSL No, its not out of choice, but a fix until EFM is installed at the new site (90 day lead time).

Edited by deleted (Wed 30-Nov-11 20:31:45)

Sync Speed is the Dictator! The 10-day training period can only affect that and as your speed is exceptional, it could only worsen it . The 10-day period has no influence on your actual throughput, which is abysmal for some reason.

21CN WBC seems to flip-flop between Interleaved and Fast Path and, for me at least, Interleaved is about 0.5 Meg faster @ 19.3 Meg and is less error/discon prone.

I 'd consider 6 re-syncs in 24hrs to be excessive.

The influencing of sync speed continues for years, not just the ten days too

Okay, day 4 ...

No re-syncs in the past 24 hours, still on the 2700HGV until the Zyxel arrives.

Running the speedtest, a much healthier ....

Download speedachieved during the test was - 14501 Kbps
For your connection, the acceptable range of speeds is 4000-21000 Kbps.
Your DSL Connection Rate :18000 Kbps(DOWN-STREAM), 1074 Kbps(UP-STREAM)
IP Profile for your line is - 15881 Kbps
Upload speed achieved during the test was - 892 Kbps
Additional Information:
Upstream Rate IP profile on your line is - 1074 Kbps

But that was after a bit of a prompt to the ISP to see what the story was, so this could have been something at their end.

Looks a lot more promising to say the least. Lets see what I get on Annex M in the next few days ...