recurrent VDSL disconnects

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mrb13676

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Hi
I'm pulling my hair out here because my VDSL line drops intermittently all the time.
Using Billion 880NXL, PTM mode, syncing as VDSL. 20Mbps.
However, on a regular basis I have no connectivity and when I check the WAN status on the modem it says connecting (or "unconfigured") ...
This can happen 4-5 times per hour but is completely random. AH run my line, have tried the "Fix my line" but it always fails.

Can anyone offer any advice/tips - this is driving us stir crazy.
Mike
 
Log in to your router and give us signal to noise ratio values. SNR.
Also provide distance to exchange, maximum estimated sync speeds etc. (if shown by router).
You can also get them to limit your speed to 10 Mbps and see if the problems go away.
 
Vaughan said:
Log in to your router and give us signal to noise ratio values. SNR.
Also provide distance to exchange, maximum estimated sync speeds etc. (if shown by router).
You can also get them to limit your speed to 10 Mbps and see if the problems go away.
Click to expand...

Thanks..
My SNR is between 12 and 19dB
Attenuation according to modem is 0 but acc to AH line test is between 27 and 30dB

distance to exchange is unknown - about 750m to our DSLAM i'd guess.
Modem reports it is syncing at 20476kbps down and 2048kbps up.
Speedtest (FWIW) shows downstream at 2.2 MB/s

I have put in a POTS filter I found kicking about and that SEEMS to have improved both real world connection speed and the disconnects. Could that have been the issue??
 
mrb13676 said:
Thanks..
My SNR is between 12 and 19dB
Attenuation according to modem is 0 but acc to AH line test is between 27 and 30dB

distance to exchange is unknown - about 750m to our DSLAM i'd guess.
Modem reports it is syncing at 20476kbps down and 2048kbps up.
Speedtest (FWIW) shows downstream at 2.2 MB/s

I have put in a POTS filter I found kicking about and that SEEMS to have improved both real world connection speed and the disconnects. Could that have been the issue??
Click to expand...

Well 12dB is pretty bad, usually dB fluctuates consistently by about 3dB which means you probably often hopping as low as 9dB, many routers will drop the connection at about 7dB so you are very close to the danger zone. Having a filter should improve the values. Try without the filter and check values again.
If its that close to stability you may remove disconnects entirely by getting the service provider to reduce the speed to 18 Mbps or 16 perhaps.
 
thanks. Will do some more investigation and let you know.....
 
Interestingly, the AH line test widget seems to report much better numbers than the modem itself is reporting.....
 
Currently running 20mb/s on 6dB.... never drops connection and it gets to a low of about 5.5dB for about a year now using Pace router. it's on ADSL 2+ though, not vdsl (20mb/s down and 1mb/s up) :D
 
Rock solid 40Mbps on 5.5 dB SNR margin. I was having issues but then TelkomZA put me on a profile that sometimes makes lines more stable with it only adding about 18ms of latency.
 
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