cancel
Showing results for 
Search instead for 
Did you mean: 

low upstream snr causing lost sync's?

Community Veteran
Posts: 3,187
Thanks: 20
Fixes: 2
Registered: 31-07-2007

low upstream snr causing lost sync's?

Since getting a new router that reports the upstream snr, I am wondering if it can be the cause of lost connections with the exchange?
I have a interleaved line and am happy with the speeds I get, if the connection is stable.  So about a month ago someone/BT's system/tooth fairy removed interleaving and I noticed that when the upstream SNR dropped to 6 or below I would suffer multi lost sync's.  So I had to get interleaving back on just to have a stable connection and wonder if its the fact that the upstream is dropping to a low figure that might be a cause.
Yesterday case in point, my upstream again dropped too 6db even though I am suppose to be still interleaved[ticket open to check if so] and since then my router has lost sync again after being stable for nearly 3 weeks, with the only dropped PPP sessions by my self to gateway hop after finding routing to USA an issue on some of them.
Unvalued customer since 2001 funding cheap internet for others / DSL/Fibre house move 24 month regrade from 8th May 2017
1 REPLY
Plusnet Alumni (retired) orbrey
Plusnet Alumni (retired)
Posts: 10,540
Registered: 18-07-2007

Re: low upstream snr causing lost sync's?

Hi Gus,
Interleaving is definitely enabled both up and downstream, that's to say it's actually on rather than being set to Auto. Not sure why the SNR is dropping like that, though it suggests some kind of noise or interference on the line either from maintenance or more likely something electrical near the line.