Hi,

I recently upgraded my ADSL modem from my trusted Vigor 2600W to new Vigor 2820Vn - to make better use of wireless networking.
However after using the 2820Vn for a few days we noticed our download speeds dropped from 3MB to 0.15 Mb.


1). Checked with my ISP (Zen internet) and they confirmed that the line speed has chanegd to the BRAS profile changing from adsl3500 to adsl135.

Upstream Downstream Sync BRAS Profile Interleave Sync Date Date
0 135 160 adsl135 Auto 19-Sep-2009 14:09 19-Sep-2009 14:09
0 3500 4000 adsl3500 Auto 19-Sep-2009 13:52 19-Sep-2009 13:52
448 3500 4000 adsl3500 Auto 18-Sep-2009 20:22 18-Sep-2009 20:22
0 135 160 adsl135 Auto 17-Sep-2009 02:43 17-Sep-2009 02:43
448 3500 4000 adsl3500 Auto 16-Sep-2009 23:07 16-Sep-2009 23:07
0 135 160 adsl135 Auto 16-Sep-2009 18:26 16-Sep-2009 18:26
0 135 4000 adsl135 Auto 16-Sep-2009 16:28 16-Sep-2009 16:28
448 3500 4000 adsl3500 Auto 12-Sep-2009 14:10 12-Sep-2009 14:10
448 3000 3424 adsl3000 Auto 26-Aug-2009 11:31 26-Aug-2009 11:31
448 2000 2272 adsl2000 Auto 11-Aug-2009 19:10 11-Aug-2009 19:10


2). Performed speed tests on line over this period - speedtest.net
http://www.speedtest.net/result/569598360.png


3). Both modems reported the same operating stats :-

Down speed (4544000)
Up speed (448000 )
SNR Margin (10.5)
loop att (20.0)


4). Have switched back to Vigor 2600w - and the line speed / BRAS profile reverted back to normal adsl3500 after couple of days.

5). Upgraded firmware of 2820Vn router to latest version on Draytek site

6). Reconnected new hardware (2820Vn) - and after a few hours use - return of slow download speeds and BRAS profile changed back to slow adsl135


As both modems are operating on the same wiring - it would seem that the 2820Vn is unhappy about something??

Has anybody else had similar experiences?


Thanks
Terry

mmm strange.

I've got a 2820vn which replaced a 2600v and I am too using Zen.
To be honest my 2820vn syncs much faster than the 2600 ever did.
I am several miles from my exchange and the best the 2600 ever managed was about 3500 while the 2820 syncs at 5300.

What modem code firmware did you try with the 2820?

Hi,

My normal speed has returned right now....

My current s/w config is :-

Model Name : Vigor2820Vn
Firmware Version : 3.3.2.1_232201
Build Date/Time : Jul 24 2009 16:48:40
ADSL Firmware Version : 232201_A Annex A

To help with fault finding, I am running a window on second screen showing the the online status of modem to check for errors when next fault occurs.

cheers
Terry

I had a stuck BRAS profile when I replaced my Netgear with a 2820vn and Zen sorted it :-

"Following the conversation we had on live support yesterday, a fault was raised on your behalf to BT Wholesale to run diagnostics on your line to fix what we believed to be a stuck BRAS profile. Following this your line is now in sync at 7968 with a line profile of 7000, up on the previous stuck 5000 profile."

ADSL Information ( ADSL Firmware Version: 232201_A)
ATM Statistics TX Cells RX Cells TX CRC errs RX CRC errs
24729417 395613421 7 13

SDSL Status ADSL Status Mode State Up Speed Down Speed SNR Margin Loop Att.
G.DMT SHOWTIME 448000 8128000 11 17

Hi All

I am also having issues with my 2820VN with my ZEN internet connection and my BRAS seems to be dropping here are the latest results:

Upstream Downstream Sync Rate BRAS Profile Interleave Sync Date Date
0 1250 1440 adsl1250 Auto 02-Oct-2009 11:59 02-Oct-2009 11:59
0 1500 1728 adsl1500 Auto 01-Oct-2009 22:54 01-Oct-2009 22:54
0 1750 2016 adsl1750 Auto 01-Oct-2009 18:34 01-Oct-2009 18:34
0 1750 2016 adsl1750 Auto 01-Oct-2009 18:31 01-Oct-2009 18:31
0 2000 2016 adsl2000 Auto 01-Oct-2009 18:26 01-Oct-2009 18:26
0 3500 2272 adsl3500 Auto 01-Oct-2009 17:18 01-Oct-2009 17:18
0 2000 2272 adsl2000 Auto 01-Oct-2009 16:36 01-Oct-2009 16:36
448 7150 8128 adsl7150 Auto 01-Oct-2009 15:23 01-Oct-2009 15:23

Do you think it could be the same and do I need to speak to ZEN to raise a fault?
Thanks
Adam

Maybe try a different modem code instead?
If it's ADSL, this one might work better:
ftp://ftp.draytek.com/Vigor2820/Firmware/V3.3.2.1/Vigor2820%20V3.3.2.1%20AnnexA%20211801.zip