Sync dropping constantly. Any theories please ?

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Hiro ZA

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i have had a 6 meg DSL connection for the past 3 months. Up until about 3 weeks ago it was rock solid. downstream at 6144 with barely a blip. in almost never dropped sync.

but after a storm 3 weeks ago, my line has been acting up :-( It was dropping sync like crazy. i once checked that stats and saw it drop ADSL connection every 2 minutes for about an hour :wtf:

i dropped it down to 5 meg, same story. dropped to 4 meg, same story. I tied changing filters, but it still drops sync randomly. I tried without a phone connected to my line in any way and it STILL drops sync randomly. sometimes it holds sync for a few hours, at other time it drops 5-10 times in 30 minutes. telkom came out and said nothing wrong. i logged another fault and this guy changed the cables running from outside house to pole. But its still dropping sync :-( :mad:

please help me, i'm going nuts :cry:
 
Search the forums, lots of peeps having the same issue - a definite noticeable degradation of ADSL service since around the beginning of the year. I also have constant sync problems, had Telkom at my place who declared 'fault fixed' but I'm still having the same issue where I periodically lose sync. Telkom isn't coming to the table on this, and those not affected don't believe us. I've even been called a liar 'cos I dared report my issue on here.

Telkom and their world-class internet my big fat hairy arse!
 
Same problem for me, there was a storm, and it was dropping every two minutes after that. The router log showed UP, DOWN, UP, DOWN every minute or two. There was noise on my line, and my SNR went below 10 for upstream. I called telkom, a tech came out, said there was water in the box (assuming its the box up on the pole - though I didn't see when they worked on it so I cant be sure). It's fixed now and I'm at 4mb 100%

So maybe there's water in something between you and the exchange?

Also, after they fixed it, my SNR and attenuation went to acceptable numbers.
 
WesleyR said:
You tried a different ADSL router/modem?
Click to expand...

i'm afraid not, as the only other router i have is an MWEB locked jobbie and i ended that contract after 2 years so its just gathering dust

evilstebunny said:
Search the forums, lots of peeps having the same issue - a definite noticeable degradation of ADSL service since around the beginning of the year. I also have constant sync problems, had Telkom at my place who declared 'fault fixed' but I'm still having the same issue where I periodically lose sync. Telkom isn't coming to the table on this, and those not affected don't believe us. I've even been called a liar 'cos I dared report my issue on here.

Telkom and their world-class internet my big fat hairy arse!
Click to expand...

exactly the issue i am having! im now onto my third fault coz they keep closing them claiming "there is no problem". but dammit, i can SEE the thing dropping every few minutes. i start a youtube vid and can barely get to the end coz its dropped connection. im gonna be forced to go the wimax route is this nonsense goes on :-(

Neverwhere said:
Same problem for me, there was a storm, and it was dropping every two minutes after that. The router log showed UP, DOWN, UP, DOWN every minute or two. There was noise on my line, and my SNR went below 10 for upstream. I called telkom, a tech came out, said there was water in the box (assuming its the box up on the pole - though I didn't see when they worked on it so I cant be sure). It's fixed now and I'm at 4mb 100%

So maybe there's water in something between you and the exchange?

Also, after they fixed it, my SNR and attenuation went to acceptable numbers.
Click to expand...

the dude did change the cables running from house to the pole, but i fear the exchange has an issue. i told them to change my point at the exchange, but lord knows if they will ever bother :-( there is little incentive to care when there is no ADSL competition in this country.

whats acceptable/appropriate SNR and attenuation on a telskum 4 meg line ?
 
Hiro ZA said:
exactly the issue i am having! im now onto my third fault coz they keep closing them claiming "there is no problem". but dammit, i can SEE the thing dropping every few minutes. i start a youtube vid and can barely get to the end coz its dropped connection. im gonna be forced to go the wimax route is this nonsense goes on :-(
Click to expand...


Only 3 faults... LOL I'm sitting on 12 logged faults, more than a month, these telkom idiots dropped me to 1mb for testing purposes, can't even properly sync on 640k and it drops every few minutes...

Feel like not paying my account this month, but I know they will just cancel it cause they are high and allmighty "gods" when it comes to adsl and we can't get anywhere without them...

I'm have stocked up on lots of lube and condoms this month, cause Telkom raped me good this month..... I'm having problems sleeping and walking straight allready.
 
Hiro ZA said:
the dude did change the cables running from house to the pole, but i fear the exchange has an issue. i told them to change my point at the exchange, but lord knows if they will ever bother :-(
Click to expand...
The issue is on the cable (1) from your pole to the SDC or (2) from the SDC to the exchange. With all the rain about you'll find that a manhole has been flooded and that some of the cable joints have become corroded. When you report it again, request that they log it as a cable fault to speed up the process. The normal techie does not handle cable faults.
 
This is why I pay about R600 for 4MB line each month....

Blazing fast speeds:


It goes so fast most of the time that the router can't keep up and have to reconnect constantly on a better speed....



PS: I was being sarcastic
 
lol :-) i feel marginally better knowing that im not the only one on the receiving end of abysmal telskum "customer service". the telskum version of customer service is to service you in the bunghole

this is what my DSL stats currently look like, on my "6 meg line"

Downstream Upstream
Data rate(Kbps) 3904Kb 640Kb
Noise Margin 6 11
Output power(dBm) 124 196
Attenuation(dB) 43 27

that SNR looks very low :-( is that why m line drops so much ? what can i do to fix the problem ?
 
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im worse off, i used to have the coolest line ever, rock solid 4mb ftw... 24/7
suddenly, it starts losing sync every 5 minutes, for about 2 minutes everytime and is so frustrating, i finally get the teckie here, he does something and behold it works again for a week and now the things dropped to 1mb for some reason and is slow as hell but no disconnects luckily :)
 
HiroZA: what ADSL modem do you have?

If you ask me, your ADSL modem really sux.
 
My line also kept on dropping, after I upgraded to 4mb.
What I did, was to force my modem to connect at G.DMT instead of ADSL2+.
Very stable since then.
 
Pada said:
HiroZA: what ADSL modem do you have?

If you ask me, your ADSL modem really sux.
Click to expand...

i have a Belkin N150 http://www.belkin.com/IWCatProductPage.process?Product_Id=492429

what makes you say that the router is the problem ?

ronald911 said:
My line also kept on dropping, after I upgraded to 4mb.
What I did, was to force my modem to connect at G.DMT instead of ADSL2+.
Very stable since then.
Click to expand...

I assume this can be done in the settings some where? naturally every routers config screen is diff, but what router do u have and where do u go ?

DCBloodHound said:
how much jitter do you get when you run a pingest?
Click to expand...
will run a pingtest tonight and see. What figure would be bad? what would this indicate ?

what is a decent SNR ? I have read that below 10 results in regular DC but what could suddenly be causing a low SNR when my line was fine previously? I have told them there is a cable fault but they say "no" :(
 
Hiro ZA said:
lol :-) i feel marginally better knowing that im not the only one on the receiving end of abysmal telskum "customer service". the telskum version of customer service is to service you in the bunghole

this is what my DSL stats currently look like, on my "6 meg line"

Downstream Upstream
Data rate(Kbps) 3904Kb 640Kb
Noise Margin 6 11
Output power(dBm) 124 196
Attenuation(dB) 43 27

that SNR looks very low :-( is that why m line drops so much ? what can i do to fix the problem ?
Click to expand...

Your SNR downstream is a HUGE problem. While your line will sync at 6db, that value is not always constant and fluctuates around that number, ie. sometimes it will go 6.5 then 7 or 5.5 then 5 ect.

Now in Europe, most ISPs say your line need at least 8db before they will sell you internet service, some you can ask and will do it at 6db, the problem is that 6db is the bare minimum for adsl to sync, so if it fluctuates below that expect your line to drop and retry to sync.

Your LA of 43 means you fairly far away from your DSLAM port, this does influence SNR a bit as well, but so does the line speed. For every mbit you go up, SNR drops by about 0.5.

My suggestion would be for you to drop that 6mbit line down to at least 4mbit maybe even 2-3mbit to get the line stable.

Edit:
Go to http://forums.whirlpool.net.au/archive/626639 and download the excel sheet. You will find with a LA of 43 you can get up to 6.4 or 7.9mbit sync speeds, however it doesn't show you other factors that will influence your line speed. Looks like you are about 3.1km away from your DSLAM port.

After looking at that, I suggest you go for 4mbit speed on your line to have it stable.

Another interesting read, that shows different modems can make a difference to your SNR and keeping it stable: http://www.hmmm.ip3.co.uk/adsl-snr/
 
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yip i have the same problem although here was no storm in CT for a long time. my line drops every 5-15mins, had a techie here already but problem was not resolved although they sent a message saying it was.
reported another fault yesterday so hopefully they will be here later to sort this mess out, its been 6 weeks now!!!
 
As per the advice of a local ISP:

"connexant chipset, so he have not excluded the router from being the problem, furthermore the line is synching at 10Mb and unless he use a trend chipset router, he is going to have a problem"

Apparently, connexant chipset routers works fine on the older exchanges, but not on Telkom's newer 10MB infrastructure.

Test it, if it does not resolve your issue, log a line fault with Telkom and request them to change the DSL port, note your line port before and after the fault has been "resolved" - knowing Telkom.

Also see: http://forums.whirlpool.net.au/archive/1562750
 
Thanks for the feedback dude. I noticed liny sync drops at 4 meg as well, so may be forced down to 3meg :-( but what i do not understand is, why the overnight change? I was on 6meg, perfect sync, for two and a half months. neither my house nor the exchange has moved, so distance change not a factor. What could cause this sudden drop in SNR ? Is it too much of a coincidence that this happened after a major storm? How can i get telskum to replace the copper line form my house to the exchange ?

Tinuva said:
Your SNR downstream is a HUGE problem. While your line will sync at 6db, that value is not always constant and fluctuates around that number, ie. sometimes it will go 6.5 then 7 or 5.5 then 5 ect.

Now in Europe, most ISPs say your line need at least 8db before they will sell you internet service, some you can ask and will do it at 6db, the problem is that 6db is the bare minimum for adsl to sync, so if it fluctuates below that expect your line to drop and retry to sync.

Your LA of 43 means you fairly far away from your DSLAM port, this does influence SNR a bit as well, but so does the line speed. For every mbit you go up, SNR drops by about 0.5.

My suggestion would be for you to drop that 6mbit line down to at least 4mbit maybe even 2-3mbit to get the line stable.

Edit:
Go to http://forums.whirlpool.net.au/archive/626639 and download the excel sheet. You will find with a LA of 43 you can get up to 6.4 or 7.9mbit sync speeds, however it doesn't show you other factors that will influence your line speed. Looks like you are about 3.1km away from your DSLAM port.

After looking at that, I suggest you go for 4mbit speed on your line to have it stable.

Another interesting read, that shows different modems can make a difference to your SNR and keeping it stable: http://www.hmmm.ip3.co.uk/adsl-snr/
Click to expand...
 
It is possible that something somewhere along your line changed, external factors can also be the cause of interference on the line. For all you know, some guy is running a illegal wireless device with a booster that now somehow causes interference on your line, not much but just just enough to make it unstable now and sending the SNR down from what it used to be 2 months ago or before the storm.
 
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