Speed halved before my very eyes

Working from home this morning, I suddenly lost connection to my corporate Outlook server. Sure enough, my broadband service had disconnected, having been up for several months. I was surprised that the connection hadn't automatically re-established itself, requiring me to manually re-connect. On re-connection, my speed has halved, down from 4700Kbps to 2400Kbps, and the noise margin has doubled from ~5DBto 10DB. What's going on??????

HH V2 version B

seems like you have had some noise on the line that has made the equipment at the exchange double your noise margin to obtain stability, this is part and parcel of a BT connection, you cant do anything other than wait at least 2 weeks for it to stabilize itself

It may be a localised, short term burst of noise.

I'd wait an hour then reboot the router again. You may find that the sync increases back to where it was, and your profile will follow later.

Hi Nevans,

How is your Broadband performing now? It does seem that noise on the line has affected your sync speed as the guys on here have so kindly pointed out (cheers guys). I can help with this if needs be, feel free to drop me an email to [email protected] including your username and BT account details. Could you also include a link to this thread so that I can refer back to it?

Many thanks..

Robbie

Just caught my eye.

I would be interested to know what the lien attenuation figure is that went with the 4700 and 5db figures???

TIA

Just gone back to the router, to get the stats to post here, and found that the speed has crept back up to:

Line state Connected
Connection time 0 days, 06:17:24
Downstream 4,256 Kbps
Upstream 448 Kbps


Modulation G.992.1 Annex A
Latency type Interleaved
Noise margin (Down/Up) 6.7 dB / 22.0 dB
Line attenuation (Down/Up) 50.6 dB / 25.0 dB
Output power (Down/Up) 6.9 dBm / 1.7 dBm

Fingers crossed that it stays like this!!

In reply to a post by nevans:

Just gone back to the router, to get the stats to post here, and found that the speed has crept back up to:

Line state Connected
Connection time 0 days, 06:17:24
Downstream 4,256 Kbps
Upstream 448 Kbps


Modulation G.992.1 Annex A
Latency type Interleaved
Noise margin (Down/Up) 6.7 dB / 22.0 dB
Line attenuation (Down/Up) 50.6 dB / 25.0 dB
Output power (Down/Up) 6.9 dBm / 1.7 dBm

Fingers crossed that it stays like this!!

Thanks for the further info, at 50.6db attentuation that is quite a long line and a nice high speed for that length. Mine is 55db and I have been having very protracted discussion with my ISP (PlusNet) who use the BT Wholesale as the provider ~ I, a good while ago, had over 3000 and a margin of 6db (this was after getting onto MaxDSL) but in March 2008 it went badly downhill and has never returned to the "good old days".

More recently further tests suggest the line is capable of a nice stable (non interleved) >3000 connection but I keep getting dropped to as now 2336 margin 13.6 ---- they are making further investigations requests of BT so there is maybe some hope, perhaps switching me to another 'pair' will be the solution???

Best of luck with yours

In reply to a post by Routefinder:

In reply to a post by nevans:

Just gone back to the router, to get the stats to post here, and found that the speed has crept back up to:

Line state Connected
Connection time 0 days, 06:17:24
Downstream 4,256 Kbps
Upstream 448 Kbps


Modulation G.992.1 Annex A
Latency type Interleaved
Noise margin (Down/Up) 6.7 dB / 22.0 dB
Line attenuation (Down/Up) 50.6 dB / 25.0 dB
Output power (Down/Up) 6.9 dBm / 1.7 dBm

Fingers crossed that it stays like this!!

Thanks for the further info, at 50.6db attentuation that is quite a long line and a nice high speed for that length. Mine is 55db and I have been having very protracted discussion with my ISP (PlusNet) who use the BT Wholesale as the provider ~ I, a good while ago, had over 3000 and a margin of 6db (this was after getting onto MaxDSL) but in March 2008 it went badly downhill and has never returned to the "good old days".

More recently further tests suggest the line is capable of a nice stable (non interleved) >3000 connection but I keep getting dropped to as now 2336 margin 13.6 ---- they are making further investigations requests of BT so there is maybe some hope, perhaps switching me to another 'pair' will be the solution???

Best of luck with yours

Some comparisons from my line (which i know to be 4km long)
(ADSL2+ too)
ADSL Link Downstream Upstream
Connection Speed 4182 kbps 755 kbps
Line Attenuation 51.0 db 31.2 db
Noise Margin 7.8 db 5.1 db

So, your line length is about the same as mine, your noise margin and attenuation about the same (as checked this morning), but BT have told me on several occasions that I cannot be upgraded to ADSL2+ because there would be no benefit. All i wanted was the increased upstream speed, as i am maintaining several websites. I give up