ADSL Keeps desyncing

G

Griz

Expert Member
Joined
Sep 15, 2010
Messages
1,199
Reaction score
1
Hello friends

So I've had super stable 10 meg ADSL for the past few months.

Now over the past couple of days my line keeps resetting every few minutes. My SNR values are not fluctuating at all and my attenuation is also good.

Could this be related to the recent rain?

Or could my router be at fault - about a week had lightning strike the port that the ADSL and phone line is connected to and it fried the splitter but I replaced the filter - could charge have gone through and damaged something else related to the DSL?

I changed my line speed down to 8 megabits and that hasnt changed anything.

SNR Margin (dB): 13.9 12.0
Attenuation (dB): 14.0 6.0
Output Power (dBm): 2.2 -0.8
Attainable Rate (Kbps): 12192 1332
Rate (Kbps): 8032 640
K (number of bytes in DMT frame): 252 21
R (number of check bytes in RS code word): 0 0
S (RS code word size in DMT frame): 1 1
D (interleaver depth): 1 1
Delay (msec): 0 0
 
it could be your filters connected to your line also check your coded phone. modem does that when there is problem with any phone connected to that line and filters aswell...............
 
Your line stats are awesome. Do you know if you're connected to an MSAN, or do you perhaps live very close to the exchange? There should be no reason why it keeps deysncing, except of course maybe a faulty modem, faulty filters, or some faulty device connected to your phone line. If lightning was at play, your modem is probably bust.

Borrow a modem from a friend/colleageue and test your line.
 
Yeah I am connected to a MSAN. Could have been on the 40 meg trial if my ISP had it :p

I'm testing with a Billion Router atm and these are the stats on it, it hasnt dropped at all since settting up:

perational Mode G.Dmt.BisPlus
Annex Type AnnexA
Upstream 639900
Downstream 8025300
SNR Margin(Upstream) 21.0 dB
SNR Margin(Downstream) 21.00 dB
Line Attenuation(Upstream) 4.5 dB
Line Attenuation(Downstream) 20.0 dB

Quite a big difference but as long as it doesnt drop Im happy :D

Oh and this seems to be connecting on ADSL 2+ while other router only connected on G.DMT
 
Last edited:
What was the first modem you were using? There's uite a big difference there in line stats between the old and new ones. Amazing what difference a good modem can do to improve your copper connection.
 
Have a look if there is something resting on the line going from your house. Maybe a tree branch or something. Used to happen to me as well, in my case it was a tree branch hanging on the line.
 
Before I was using a D-Link 2500u - the current router is a Billion/Telkom - not sure of the model.

The strange thing though was that on the D-Link I could never (even when the line was stable) connect for more than a few minutes to the exchange using ADSL2+ but was completely stable on G.DMT.

This Billion router seems to interpret ADSL2+ better than the D-Link.

I think the D-Link must have been faulty or damaged after the lighting storm as my internet hasn't dropped once since connecting the Billion.
 
Ok turns out this new router was good for a few hours now it also keeps dropping, is it possible that I have a faulty port?
 
Have had the same problem in the evenings and weekends since 09/09/2012 and Telkom still has not fixed it!
 
I was experiencing the exact problem you are having here, and the modem router always looked connected, the light was always on but not connected, we had that heavy rain for almost a week, before the rain it was fine as normal, im guessing it was lightning during the night, i got a new modem and it works how it used to. my last modem was one of those white tenda 4 port modems. new one a Zyxel, if possible try borrow a friends spare modem to test out your connection.
 
Last edited:
OK so I'm guessing that your port at the exchange is faulty. Ask Telkom to change you to a new port. This is something which is quite hard to do in my experience - you'll have to fight to get it.

Alternatively, depending on how much you can afford and how desperate you are, apply for a completely new telephone and ADSL line. Once it is installed, and you're happy that it is stable, cancel the old line. But only cancel after the second line is installed and running. That way Telkom will be forced to connect the new line to a different port, and ensure that is is working and stable. You also bypass any of your existing cabling from the exchange to your house as Telkom have to put your new line on a new copper circuit. If you first cancel, then apply for a new line, you will very likely be connected along the same circuit, and to the same port.

If you need your old telephone number, you can ask Telkom to transfer it to the new line when cancelling.

It's a long process, and costs a bit of money, but it works. Better than suffering for months or years, waiting for Telkom to fix the problem (log fault, wait several days, Telkom closes it as resolved, although nothing appears to have been done, and your line is still faulty. Rinse and repeat). Also new lines and new subscribers are generally given higher priority with Telkom.
 
Last edited:
Saajid said:
OK so I'm guessing that your port at the exchange is faulty. Ask Telkom to change you to a new port. This is something which is quite hard to do in my experience - you'll have to fight to get it.

Alternatively, depending on how much you can afford and how desperate you are, apply for a completely new telephone and ADSL line. Once it is installed, and you're happy that it is stable, cancel the old line. But only cancel after the second line is installed and running. That way Telkom will be forced to connect the new line to a different port, and ensure that is is working and stable. You also bypass any of your existing cabling from the exchange to your house as Telkom have to put your new line on a new copper circuit. If you first cancel, then apply for a new line, you will very likely be connected along the same circuit, and to the same port.

If you need your old telephone number, you can ask Telkom to transfer it to the new line when cancelling.

It's a long process, and costs a bit of money, but it works. Better than suffering for months or years, waiting for Telkom to fix the problem (log fault, wait several days, Telkom closes it as resolved, although nothing appears to have been done, and your line is still faulty. Rinse and repeat). Also new lines and new subscribers are generally given higher priority with Telkom.
Click to expand...

This is actually something I should have done years ago. When I first got 4 meg the first 8 months were a constant battle with Telkom - had I known it would take that long to fix it I would have definitely have ordered a new one and then cancelled the existing.

I'm gonna log a fault and if it's not fixed a in a few weeks then will definitely do the above :)

Thanks for the advice.
 
Having the exact same problem than you, my internet had no problems for almost a year, month ago it all started where i'll just lose sync, for the last 2 days it's been on for 10seconds then down again, telkom was at my house 3 times now even switched me over on another line, was fine for 2 days and now again same problem.

Been testing other modems as well, so can't be my modem.

P.S Last night i got home and it was up/down untill 10PM then it got stable untill 2AM then i went to be without problems.
 
PLEASE HELP ME!!!

:mad: :mad: :mad::

I took Saajid's Advice http://mybroadband.co.za/vb/showthread.php/476572-ADSL-Keeps-desyncing

I had a second phone line with ADSL installed today and it has exactly the same problem where the ADSL re-syncs / disconnects and reconnects every few minutes in the evening.

So I have brand new phone line and a brand new D-Link modem connected to Telkom via the Guest account. It worked when the Telkom man put the new line in this afternoon but this evening it just started the same problem of my previous ADSL line re-syncs disconnects and reconnects every few minutes.

I also have my original ADSL line with a new Netgear modem which I bought when this old ADSL line started to drop on 09/09/2012 disconnecting and reconnecting re-syncing every few minutes mainly in the evening.

Both the new ADSL line and the old ADSL line are disconnecting re-syncing and reconnecting every few minutes and not always at the same time but mostly at the same time.

The connection speed is good while the modems are connected but it drives me mad when the disconnecting and re-syncing starts as you cannot even brows the internet because the re-sync takes time to reconnect.

Seem the original replay by NomNom to my original post was correct. http://mybroadband.co.za/vb/showthr...Reconnects-During-Peak-Hours-Only-PLEASE-HELP!

The Telkom Exchange I am on must be oversubscribed. The Telkom technicians said if it was oversubscribed I would get a slow connection. Is this true? The Telkom Tech that installed my line said the exchange is a new Chinese exchange. I believe my original ADSL line fault started when they put this new exchange in.

I have tried to report the fault on the new ADSL line and Monty at the call centre said he cannot give me a call / fault reference because it is a new line?

PLEASE HELP ME!! :mad::sick::mad:

No one at Telkom cares! cry::cry:

Now trying to get this post up while my ADSL line in constantly disconnecting and re-syncing then disconnecting etc.
 
Last edited:
ZuluKing said:
:mad: :mad: :mad::

I took Saajid's Advice http://mybroadband.co.za/vb/showthread.php/476572-ADSL-Keeps-desyncing
Click to expand...

I'm sorry that my advice didn't work out for you :whistle: :whistle:

I am now at a loss, though this seems to point to a factor affecting your line stability that is not on Telkom's network. Like maybe your electricity supply, or the plug point and/or adaptor you are connected to? Perhaps electromagnetic interference from a nearby cordless phone, microwave, CRT TV screen, or other device?

Or perhaps there is a problem with an entire DSLAM at the exchange, and not just a few ports.
 
Mine just started desyncing today as well - 011886 exchange.

Code: 
Nov  6 07:17:16 syslog: Linesync lost
Nov  6 07:17:23 PPPoE: Connection terminated.
Nov  6 07:17:23 PPPoE: Connect time 33.0 minutes.
Nov  6 07:17:59 syslog: Linesync achieved
Nov  6 07:37:01 syslog: Linesync lost
Nov  6 07:37:02 PPPoE: Connect time 18.9 minutes.
Nov  6 07:37:45 syslog: Linesync achieved
Nov  6 07:51:57 syslog: Linesync lost
Nov  6 07:52:03 PPPoE: Connection terminated.
Nov  6 07:52:44 syslog: Linesync achieved
Nov  6 09:34:08 syslog: Linesync lost
Nov  6 09:34:09 PPPoE: Connection terminated.
Nov  6 09:34:09 PPPoE: Connect time 101.0 minutes.
Nov  6 09:34:58 syslog: Linesync achieved

SNR Margin (Upstream) 14.1 db
SNR Margin (Downstream) 14.2 db
Line Attenuation (Upstream) 17.1 db
Line Attenuation (Downstream) 33.0 db
 
Saajid said:
I'm sorry that my advice didn't work out for you :whistle: :whistle:

I am now at a loss, though this seems to point to a factor affecting your line stability that is not on Telkom's network. Like maybe your electricity supply, or the plug point and/or adaptor you are connected to? Perhaps electromagnetic interference from a nearby cordless phone, microwave, CRT TV screen, or other device?

Or perhaps there is a problem with an entire DSLAM at the exchange, and not just a few ports.
Click to expand...

I have the new ADSL line that was installed on Monday with a brand new plug point and a brand new D-Link ADSL modem and I have my Netgear ADSL modem connected to my old ADSL line.
Both ADSL lines do not disconnect re-sync and reconnect at the same time. One will disconnect while the other is connected and then sometimes both are disconnected at the same time. The problem is still related to the time of the day as both lines work perfectly from midnight until eight in the morning when the disconnect re-sync and connect problem starts again then it get bad again at midday and then very bad in the evening until midnight.

It is not an electricity supply problem because both modems are using different plugs and they only use a small amount of power from there adapters. There is nothing that could cause electromagnetic interference nearby. No CRT TV etc.
Both modems lose connection at different times!
I am certain it is the DSLAM that needs to be changed and this has been a question I have asked from the start of the problem. The Telkom technicians say if the DSLAM reports as ok so they will not change it and explain it is out of there control.

I am sure the problem stated when they installed the new Chinese exchange!

How do I resolve this problem? Telkom will not log a fault for my new line!! Telkom have not fixed my old ADSL line and keep clearing the faults logs without contacting me to see if the problem is fixed. They obviously take a quick look see the line is syncing and clear the fault report because the Telkom technician has done all he can.

How do I get Telkom to change the DSLAM?

How do I get Telkom to understand and fix my problem because speaking to the call centre and technicians is not working?
 
A friend of mine recently had a similar issue, where his line would just disconnect every now and then when he was hosting a DOTA game.

He had Telkom reset/recreate his port and nothing changed.

Apparently it is now fixed, after he forced his ADSL modem (a Billion one) to connect on G.DMT (ADSL) and not ADSL2+ mode.
This is definitely worth a shot for most of you!
 
If it is happening only at night you should also check that no automatic lights or day night switches near your line are interfering. If you have an alarm system check that it is not hooked up to your phone line.
 
You must log in or register to reply here.
Back
Top
Sign up to the MyBroadband newsletter
X