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Hello again 
I'm having problems with my sky broadband again. about once a month the broadband likes to disconnect about 100 times in the same day, this is now the 3rd month its happened and the 3rd day of the problem.
What happens is as im looking at the router stats as its disconnecting the noise margin goes all the way down to 0 db on upstream and then disconnects the broadband as seen below
Connection Speed 9165 kbps 799 kbps
Line Attenuation 44.0 dB 24.6 dB
Noise Margin 6.1 dB 0.0 dB
im trying to find the route of the problem to stop it happening again so im hoping the intelligent folk of this forum might have an idea so i can pass it along to the engineer that is visiting tomorrow to try get this fixed once and for all
Thankyou.
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Presume it does this when in the test socket too? i.e. ruling out extension wiring
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The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
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Hi MrSaffron, thanks for the reply.
It does yes, no extensions at all in the house, comes from outside line straight into the master socket, have changed filters twice and threw them in the test socket but problem is still happening. Sky seems to have figured out a temporary fix but happens around once each month and a reset of the line seems to fix it for a time.
Was hoping for something that might cause upstream noise margin to drop.
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My guess would be Sky's equipment in the exchange, but with such infrequency it is going to be nigh on impossible to prove.
Do stats at 'good' times give no clue at all ?
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No none at all unfortunately. The connections great at good times with a noise margin of 6 on downstream and 15 on upstream and is very reliable with a disconnection maybe once per week sometimes not even that.
The problems baffled the other 2 engineers that visited last time.
Don't want to move away from sky as they are the only ones that offer adsl2 plus services and get a decent and reliable speed with them when it does work.
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and is very reliable with a disconnection maybe once per week sometimes not even that.
Except of course that I wouldn't expect even that. My old ADSL service would stay up for a months at a time.
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Maybe capping the upload speed at say 650 Kbps and shaving a fraction off the download, achievable by increasing target noise margin might increase stability.
The upstream signal is weakest at the exchange end, so jumpering or even some monthly task on the LLU DSLAM may be an issue, or a slightly dodgy splitter/filter that is not fully doing its job at exchange end
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The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
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he upstream signal is weakest at the exchange end, so jumpering or even some monthly task on the LLU DSLAM may be an issue, or a slightly dodgy splitter/filter that is not fully doing its job at exchange end
You are presumably privy to info I don't got Mr.S
The issue the OP really has here is getting their CP to get OR to do something about it I suspect.
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well my first thought was instability when it first happened. but I've been syncing at around 9mbps down and 942 kbps up for about 3 weeks without problems. I remember in my last post someone thought interference but I'm honestly no quite sure myself. I'll see to the capping and see if the engineer can do anything about that. maybe throwing the noise margin at around 9db will fix the problem but not getting my hopes up.
I'll just let the engineer read through this to see if he can get any ideas from it.
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The engineer will need to liaise with Sky, and persuade them that the target snr be pinned to 9db ..... this isn't as easy as perhaps it ought to be. By the same token for Sky to agree to a lift and shift can be equally tricky ..... They want it to be an Openreach issue, and therefore not pay for the visit.
Interference ? I hugely doubt it, and even if it is, the chance of an Openreach REIN engineer being able to find such a hugely intermittent source is VERY unlikely.
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Have you tried a different modem?
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He'll be using the standard issue Sky router I suspect ?
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My thoughts exactly. never had problems like this on adsl 8m. So that ruled out interference for me.
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never had problems like this on adsl 8m.
I'm guessing the only thing to changed since is your service now uses Sky's kit in the exchange, and their router.
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I'd be inclined to get a HG612 from Flea Bay and set up DSLStats and MyDSLWebStats for 24*7 monitoring.
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the second time it happened i tried my old tp link router for 5 mins but disconnected once while connected to it so just threw the sky hub back in, 5 mins aint a great test lol.. Might throw it back in and leave it a day or so to see what comes up. it also has the ability to record its own stats so it might be easier for you guys to diagnose with some proper info if the problem still occurs with another router.
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Pretty much yes.. Plus the 2nd adsl line.. I got my 2nd adsl line around the same time i switched to sky to lessen the load on the sky one as the family are heavy netflix users so thought a 2nd line would fix the problem with the slow net while streaming. I don't think that is the issue but called SSE up today to cancel and terminate my service to see if that fixes the problem.
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Does not rule out interference totally, the dipping SNR suggests something is messing with the signal somewhere and as the old up to 8 Mbps service only uses about half the upstream capability available there was lots of room for surviving noise in the frequency bands the upload uses.
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The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
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I've just plugged in my old router and there have been no disconnects so far, have had it on for about 30 mins so keeping fingers crossed. It looks to me also this router connected increases the snr for both upstream and down including line attenuation, maybe it is a stability issue.. i'll keep an eye on it.
Upstream Downstream
Current Rate (Kbps) 796 7484
Max Rate (Kbps) 905 7140
SNR Margin (dB) 9.3 4.8
Line Attenuation (dB) 23.1 47.3
Errors (Pkts) 0 0
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Sky used to be fairly good about users requesting tweaks to their DLM, so if upload is not crucial they could get the DLM tweaked to give lower upload e.g. 550 Kbps
Another option is to use a router that allows the user to tweak the ADSL2+ target margins/stability, though cannot recall if this does work on the Sky DSLAM
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The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
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But I believe the OP is on an ADSL service ?
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I use a HG612 in bridged mode on a 20CN ADSL service, it works very well.
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I was told by one of the sky operators that this would be a temporary fix as dynamic line management would kick in 1 day out the month and reset it.
I'll do more research on the routers that allow you to do that and if sky allow it.
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Fair enough.
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RouterStats Lite can interrogate Sky's SR102 router (Sky Hub 2) and plot the sync speed & prevailing SNRM at defined intervals into handy charts.
Might not be that useful in your situation as you'd need to have a PC up and running the whole time over the month to secure a complete sample set to demonstrate the issue (my problem was exhibiting every workimg week day). Just thought I'd mention it as it assisted investigations into noise impact on my line a while back.
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Thanks for the info, i'll certainly give it a try. Thankfully it has stopped disconnecting but next month is just around the corner so will try get this setup asap.
Just hope my laptop can run for a month without a restart
Thanks
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