Odd behaviour by 8800nl

[SimonCraddock]

I've had my 8800nl hooked up now for well over a month and was happy with the connection and stability until now...

About a week ago my connection dropped and I noticed the 'attainable rate' had dropped from approx. 67/22 to 64/22. No big deal I thought it's probably just the adverse weather at the time. The following week I noticed it had dropped to 58/22, no change in SNRM etc, so I thought I'd do a reboot and see if it went back up. Oddly it went down further to 52/22, still no significant change in SNRM or Interleaving level was recorded.

Last night I plugged in my ZyXel VMG8324-B10 and the attainable rate was back to around 64/22.

Anyone else experienced this lately?

[billion_fan]

I've had my 8800nl hooked up now for well over a month and was happy with the connection and stability until now...

About a week ago my connection dropped and I noticed the 'attainable rate' had dropped from approx. 67/22 to 64/22. No big deal I thought it's probably just the adverse weather at the time. The following week I noticed it had dropped to 58/22, no change in SNRM etc, so I thought I'd do a reboot and see if it went back up. Oddly it went down further to 52/22, still no significant change in SNRM or Interleaving level was recorded.

Last night I plugged in my ZyXel VMG8324-B10 and the attainable rate was back to around 64/22.

Anyone else experienced this lately?

What firmware version are you on??

[SimonCraddock]

The latest 2.32d.dh14

[billion_fan]

The latest 2.32d.dh14

Try the older DMT code (attached firmware, upgrade and reset back to factory default settings needed)

[SimonCraddock]

Could it be down to the driver?

The Billion I believe is 39g and the ZyXel latest driver is 39i.

There's also reports of something unusual going on at cabinet level, possibly to do with vectoring.

http://forum.kitz.co.uk/index.php?topic=14806.0

[billion_fan]

Could it be down to the driver?

The Billion I believe is 39g and the ZyXel latest driver is 39i.

There's also reports of something unusual going on at cabinet level, possibly to do with vectoring.

http://forum.kitz.co.uk/index.php?topic=14806.0

I know BT are testing our 8800NL as we speak, but other then that all I have is the two different DMT codes, maybe worth a try to see which one performs better on your line

[SimonCraddock]

I'll try the older ones later tonight and see what the outcome is. Thanks.

[SimonCraddock]

No real difference.

The 8800nl will only synch at 50/22 now whereas my Zyxel is showing 62+/22.

Looks like the 8800nl will have to be shelved for now which is a shame because the Zyxel GUI is quite buggy.

[bobmurchie]

I have recently installed an 8800NL and set about trying to reduce my SNR margin using the suggested values. 4 gave me 10 db, 6 gave me 12db and 1 gave me 7db. This seems to be the opposite effect to that generally described. Am I missing something, apart from my marbles?

[billion_fan]

I have recently installed an 8800NL and set about trying to reduce my SNR margin using the suggested values. 4 gave me 10 db, 6 gave me 12db and 1 gave me 7db. This seems to be the opposite effect to that generally described. Am I missing something, apart from my marbles?

It all depends on the default SNR, if the default SNR is 6 then using 1-6 should be fine, but if the default value is not 6 eg 12db then you have to use the table below

Eg your default SNR is 12db you enter the value of 4092 (which equals a -10.5db) so you should end up with a SNR of 1.5db