7800DXL - poor broadband 1 mile from exchange

[Andrew]

Please could I have some guidelines on how to optimise my 7800DXL for a 1M unstable broadband existence in the country. Especially if lots of devices go on, my smartphone gives a warning "checking internet connection"," your connection is unstable", and drops the wifi connection.

[billion_fan]

Please could I have some guidelines on how to optimise my 7800DXL for a 1M unstable broadband existence in the country. Especially if lots of devices go on, my smartphone gives a warning "checking internet connection"," your connection is unstable", and drops the wifi connection.

You need to post your 'xdsl' stats so first before we can advise.

Found under 'Status >> Statistics >> xDSL' take a screen shot of this page and post it here

[Andrew]

xDSL
Mode ADSL_G.dmt
Traffic Type ATM
Status Up
Link Power State L0
Downstream Upstream
Line Coding (Trellis) On On
SNR Margin (dB) 6.7 12.0
Attenuation (dB) 57.0 31.5
Output Power (dBm) 17.9 12.5
Attainable Rate (Kbps) 3336 804
Rate (Kbps) 2528 448
K (number of bytes in DMT frame) 80 15
R (number of check bytes in RS code word) 16 16
S (RS code word size in DMT frame) 2.00 2.00
D (interleaver depth) 16 4
Delay (msec) 8.00 8.00
INP (DMT symbol) 0.73 0.13
Super Frames 31324043 31324043
Super Frame Errors 705 20
RS Words 1065017445 266256006
RS Correctable Errors 14871280 168
RS Uncorrectable Errors 5122 0
HEC Errors 4361 27
OCD Errors 28 0
LCD Errors 28 0
Total Cells 3174950790 0
Data Cells 210353785 0
Bit Errors 0 0
Total ES 356 0
Total SES 0 0
Total UAS 13 13

Thanks for your help

Andrew

[billion_fan]

xDSL
Mode ADSL_G.dmt
Traffic Type ATM
Status Up
Link Power State L0
Downstream Upstream
Line Coding (Trellis) On On
SNR Margin (dB) 6.7 12.0
Attenuation (dB) 57.0 31.5
Output Power (dBm) 17.9 12.5
Attainable Rate (Kbps) 3336 804
Rate (Kbps) 2528 448
K (number of bytes in DMT frame) 80 15
R (number of check bytes in RS code word) 16 16
S (RS code word size in DMT frame) 2.00 2.00
D (interleaver depth) 16 4
Delay (msec) 8.00 8.00
INP (DMT symbol) 0.73 0.13
Super Frames 31324043 31324043
Super Frame Errors 705 20
RS Words 1065017445 266256006
RS Correctable Errors 14871280 168
RS Uncorrectable Errors 5122 0
HEC Errors 4361 27
OCD Errors 28 0
LCD Errors 28 0
Total Cells 3174950790 0
Data Cells 210353785 0
Bit Errors 0 0
Total ES 356 0
Total SES 0 0
Total UAS 13 13

Thanks for your help

Andrew

When the issue occurs, can you check the lights on the front of the router, to see if the DSL light is 'blinking' or if the 'Internet' light is off

[Tomken]

With a throughput of just ~2.5meg, multiple devices connected and depending what they are doing could max out the bandwidth and cause the disconnects - but you should be getting a much higher sync rate than you are unless that is what you are paying for.

What is the connection like with just one computer switched on ?

Is your router connected to the master socket and do you have a NTE5 faceplate fitted http://www.kitz.co.uk/adsl/socket.htm where you can remove the faceplate and plug the router via a microfilter directly into the test socket to see if the speed improves ? http://www.speedtest.net

Changing the microfilter can also have a beneficial effect, but if there is no improvement when plugged directly into the test socket, then I would advise you to contact your ISP as the Downstream Attenuation should be much lower than 57 when only ~1 mile from the exchange, although the amount of cabling between you and the exchange can be much longer.

The Downstream Attenuation can be artificially increased because of bad quality cabling/joints between you and the exchange and can sometimes be nailed down to bad clips in the cabinet.

[Andrew]

Thank you for your reply.

It works much better with fewer things connected although it is slow.

BT Openreach have checked and remade the connections (a) from telephone cable in lane to telephone cable to my house (it was full of water and upside down) (b) in my house and (c) given me a better filter socket to plug the router in. I bought the Billion router after these changes. It might be a little more than 1 mile to the exchange - copper wires slung between trees - but not that much more.

Is the Billion doing the best it can with what I have got?
regards
Andrew

[billion_fan]

Thank you for your reply.

It works much better with fewer things connected although it is slow.

BT Openreach have checked and remade the connections (a) from telephone cable in lane to telephone cable to my house (it was full of water and upside down) (b) in my house and (c) given me a better filter socket to plug the router in. I bought the Billion router after these changes. It might be a little more than 1 mile to the exchange - copper wires slung between trees - but not that much more.

Is the Billion doing the best it can with what I have got?
regards
Andrew

If you need a increase in speed try setting the SNR to 3 on the SNR page, to see if this improves your speeds, the target SNR downstream value we are aiming for is 3.7db

[dmsims]

Are you really 1m from the exchange?

Your line length is MUCH longer than that

For the attenuation the line is performing pretty well

Try using QOS to manage the bandwidth (saturating the upstream is normally the main issue)

Have you checked Phyre is on ?

[AdrianH]

An attenuation figure of 57db would indicate the line length is at least 4.1Km .

[robatbentley]

I have a similar problem so posting under this message. ...but if you recommend creating a new message then just let me know.

I'm also probably about 2 miles form the exchange, but on initial installation of the 7800DXL (started about 10 days ago with fine tuning to SNR of about 2.5 with xDSL mode of G.Dmt) I managed to improve my download speed from approx 2.3Mbps to about 4Mbps. ...but only for a few days! Then it all changed overnight and I'm now back to about 2.6Mbps down. Re-tried going through the xDSL mode and SNR settings, rebooting, power-off/on but no improvements. I've attached a screen-shot (7800DXL_image01) of the Status/Stats/xDSL screen but can provide more if required.

Any guidance on my config will be really appreciated to try and get me back to the improved 4mbps

General setup is...

• 3 PCs on LAN - 2 on CAT6 cable, other on wireless, but testing done when I'm only user of LAN
  Using BT business broadband
  Updated to latest 2.32d firmware
  Using a NTE5 with seperate ADSL and phone sockets installed by BT openreach just before installing the 7800DXL
  Using BTs Wholesale tester at http://speedtest.btwholesale.com/ to test speeds