Initial estimate: 60.7 / 20
Current estimate: 62.9 / 20
Current Sync: 77678 / 20000

http://www.thinkbroadband.com/speedtest/button/13688...

Infinity2

EST (BT Checker)

WBC FTTC Up to 72.1 Down, Up to 20 Up
WBC ADSL 2+ Up to 3.5 Down, 2.5 to 4.5 Up
WBC ADSL 2+ Annex M Up to 3.5 Down, 2.5 to 4.5 Up
ADSL Max Up to 2.5 Down, 1.5 to 5 Up

Actual (reported from modem)

Attainable rate (kbit/s) 100028 33003
SNR margin (dB) 11.6 14.3
Line attenuation (dB) 0 0
Output power (dBmV) 13.5 -1.9

Speedlink

http://www.thinkbroadband.com/speedtest/results.html...

Upload is normily MUCH better then that report.

Hi

As is the case with ADSL, interference due to cross talk is going to be very low in the early days of deployment, and so this will likely see more people reporting better than the estimated speeds that will have been calculated to take into account cross talk.

The more people that join the service to a cabinet the more potential for cross talk and it is very likely sync speeds will have a tendency to drop over time.

I lot of people saw the same issue on ADSL2+, very noticeable to those getting >20Meg on ADSL2+ for being an early adopter, then seeing that continually drop bit by bit until they were on much less once the wider rollout of ADSL2+ services took place. A lot drove themselves mad fault reporting or fiddling with settings and wiring to blaming the ISP for slowing them down.

We just have to accept given we are still using decades old telephone wiring for part of the signal that estimated speeds from BT are always going to be just that, and that these cables will cause and allow themselves to be affected by interference and cross talk.

I expect those doing better than the estimate now, given a few more people signing up and sharing their cabinet will see their speeds fall to come ever closer or even below the estimate.

So don't drive yourself insane worrying about your sync speed being a bit less than an estimate and enjoy your connection which is considerably faster than the speeds of many.

Regards

Phil

In reply to a post by Croftie:

I was bored so here you go BE:

Haha! Thanks Croftie

the one with just 2 images animating is taken a week apart, that difference was all in one go so very likely just one customer, also the first image already had crosstalk, as it was taken on my 90/36 when I started off on 110/36.

the one with 3 images is the first 2 the same dates as the QLN, the 3rd is a more recent image,

Edited by Chrysalis (Sat 18-May-13 11:54:23)

there is no garuantuees of it been low early, its just more likely.

I was first on my cab but just 2 weeks later the affect on my posted image was there. Since then the next 6 months has much less crosstalk introduced but as can see with the 3rd image still some introduced, I was just unlucky a evil pair next to mine was made FTTC enabled so quick.

Does the sync speed change automatically on FTTC or does the modem have to reboot for a change of sync?

The cabinet->modem sync changes automatically. DLM forces a modem resync (without reboot) when it thinks the time appropriate.
Usually in the middle of the night to minimize user disruption.

BUT the IP/BRAS profile is derived from the sync speed on PPPoE connection; between the router and the exchange at a higher level.
Sometimes (often in my experience) the modem resync is so quick that the PPPoE connection is not dropped, so no new connection made, so the IP Profile is stale.
If you have any reason to think that there may be a low level sync improvement, it is worth disconnecting and reconnecting the HomeHub (or other router).
So after a sudden drop in speed, disconnect/reconnect first thing each morning in case there was a sync improvement overnight.

If you have an unlocked modem, you can see the sync improvement so no need for daily trial and error reconnect of router.
Just reconnect when the sync rises but the profile doesn't.

~~~
Improvements to latency will happen automatically on low level resync, no need for router to match.

Openreach has configured a vdsl line-profile in which the upstream and downstream transmission rates are adapted at start-up only. After line activation, the transmission rates cannot change. Any change to the transmission rates requires the retraining of the line.

Openreach disables the feature, but the Huawei MA56xx DSLAMs can also dynamically adapt transmission rates at runtime (i.e. during showtime). If enabled, this does not require the retraining of the line.

cheers, a

Shhhh! Don't let Chrysalis read that .