Frequent ADSL "Disconnections"

B

brazz

Active Member
Joined
Nov 30, 2005
Messages
40
Reaction score
0
For the last couple of months I've been experiencing many many "disconnections" on my ADSL line at home. I don't really know if it can be called disconnections... the modem shows all status lights that everything is fine, but I have absolutely no connectivity to the internet. The only way to fix things at this moment is to reboot the ADSL modem.

I would appreciate any help or guidance on how to correct this frustrating problem. MWEB recons that the fault is not on their side and so is Telkom.

Modem: D-Link DSL-2540U
SP Account: MWEB 4Mbps Uncapped
Telkom: 6 Mbps sync speed

Could it be the modem?

Any help is welcome!
 
brazz said:
For the last couple of months I've been experiencing many many "disconnections" on my ADSL line at home. I don't really know if it can be called disconnections... the modem shows all status lights that everything is fine, but I have absolutely no connectivity to the internet. The only way to fix things at this moment is to reboot the ADSL modem.

I would appreciate any help or guidance on how to correct this frustrating problem. MWEB recons that the fault is not on their side and so is Telkom.

Modem: D-Link DSL-2540U
SP Account: MWEB 4Mbps Uncapped
Telkom: 6 Mbps sync speed

Could it be the modem?

Any help is welcome!
Click to expand...

Can you post the SNR/Noise Margins in DB and Line Attenuation and plus it could be the lan cable/lan port or wireless depending on which you using. I had the same problem a while back so had to replace my whole router.

Heres good router I recommend you should buy

TP-Link W8960N 300Mbps Wireless N ADSL2+ Router [TD-W8960N] R489.00
http://www.dbg.co.za/product_info.php?cPath=1_55_57&products_id=383
 
Absolutely nothing wrong with D-Link modems in general, no need to get anything else except if your specimen is stuffed.
Have you tried another ISP account to eliminate Mweb issues?
 
Modems do die. Even the best ones.

This sounds like it could be a dying modem...
 
brazz, log in on your ADSL modem's webpage, and then post your line attenuation, sync speed and SNR margins here.

I think that the solution to your problem would simply be to downgrade your ADSL line speed to like 4Mbps.
 
Thank you. I will post S/N ratio and attenuation figures tonight. Last time I checked with Telkom and MWEB they were within acceptable levels.

Thanks for the help so far!
 
brazz said:
Thank you. I will post S/N ratio and attenuation figures tonight. Last time I checked with Telkom and MWEB they were within acceptable levels.

Thanks for the help so far!
Click to expand...

Ye thats why I suppect it is the router cause the lights would flash when it disconnects instead of staying on. Some routers show a red light instead.
 
There are also a bunch of other reasons for the Internet to stop working, like
a) DNS issues
b) too many open connections due to like Torrents
c) a bug in the current firmware of the router
d) a router that is overheating
 
Hi everyone.
What are the Telkom acceptable limits for ADSL. I have to keep logging calls on a 4 Meg line (using Telkom Netgear DG834) where the line keeps dropping too. Techies come out, do a few things then close the call, but the line remains unreliable. I have logged multiple calls over the last few months.
Netgear DG834 (011264xxxx, Lombardy exchange, 4MB line)
Line attenuation downstream is 59dB upstream 30dB
Noise margin downstream 8.55dB, upstream 13dB
I keep explaining to Telkom that there is another line on the same premises and the line stats on that line are:
Siemens router (011882xxxx Lombardy exchange, 384k line):
26,6db noise upstream 46,6db upstream attenuation, 12,3db output power

I am determined to keep the current call open until they reduce downstream attenuation, but am I wasting my time?
Anyone got advice on what to do?
 
You can forget about running 1Mbps or faster with an ADSL line that has a downstream line attenuation of 55dB or higher.
At 59dB downstream line attenuation you'll even struggle to maintain a stable 384kbps connection with some ADSL modems.

The line attenuation is relative to the length of your ADSL line - from your home to the DSLAM. So it would seem that the 384kbps line is connected to a DSLAM closer by, OR your 4Mbps line is faulty. Either way you should have Telkom have it looked at: fixing it or trying to move you to a closer by DSLAM.
 
Pada said:
You can forget about running 1Mbps or faster with an ADSL line that has a downstream line attenuation of 55dB or higher.
At 59dB downstream line attenuation you'll even struggle to maintain a stable 384kbps connection with some ADSL modems.

The line attenuation is relative to the length of your ADSL line - from your home to the DSLAM. So it would seem that the 384kbps line is connected to a DSLAM closer by, OR your 4Mbps line is faulty. Either way you should have Telkom have it looked at: fixing it or trying to move you to a closer by DSLAM.
Click to expand...

I agree. This is exactly the info I give when logging the call. Downstream attenuation too high (Telkom tell me their limit is 60dB!) and the other line on the same premises is 46dB. They recreate the port, send a technician, he does a few things and closes the call. Back to modem resync's, logging another call. Endless process.

Can anyone confirm what Telkom's highest acceptable attenuation limits are? I have been told 55dB or 60dB.
Anyone got advice on how to get this call resolved properly?
 
Hi there

I finally got round to checking line stats.

Firstly, on my D-link modem:

SNR Downstream: 5.6 dB; Upstream: 11 dB
Attenuation Downstream: 49 dB; Upstream: 29.5 dB

I installed a test Netgear N-150 router earlier tonight. Readings are slightly different:

SNR: Downstream: 8.5 dB; Upstream: 11 dB
Attenuation Downstream: 46.3 dB; Upstream: 26.5 dB

I'm keeping the Netgear modem running for a while to see if I still get the same problem and will report back on this thread.

Regards
 
brazz, the SNR margins are irrelevant without the line speed!

My guess is the Netgear is currently running at like 4Mbps, where as the D-Link actually managed 6Mbps.

With your high line attenuation value, I would suggest that you phone Telkom and let them lock your line speed on 4Mbps, otherwise you will have an unstable line.
 
brazz said:
For the last couple of months I've been experiencing many many "disconnections" on my ADSL line at home. I don't really know if it can be called disconnections... the modem shows all status lights that everything is fine, but I have absolutely no connectivity to the internet. The only way to fix things at this moment is to reboot the ADSL modem.

I would appreciate any help or guidance on how to correct this frustrating problem. MWEB recons that the fault is not on their side and so is Telkom.

Modem: D-Link DSL-2540U
SP Account: MWEB 4Mbps Uncapped
Telkom: 6 Mbps sync speed

Could it be the modem?

Any help is welcome!
Click to expand...

Hi brazz,

I would like to look at this from our end, please PM me your MWEB account details and I will provide you with feedback.

Regards,
MWEB Guy
 
Just some feedback on the ADSL performance after I changed to the Netgear test modem...

I have seen only one problem since I replaced the modem. On Friday evening the speed of my connection started slowing down until there was nothing. A reset of the modem put things back to normal.

Other than this I am now very happy with the connection as we do not need to reset the modem at all. I find the internet slow tonight though, but it is still working.

Thank you to all for helping me in this thread. I will post any news if or when it comes available.


Regards
 
brazz, could you please post all the stats again: line attenuation, SNR margin and sync speed?
 
Pada said:
brazz, could you please post all the stats again: line attenuation, SNR margin and sync speed?
Click to expand...

Apologies for the delay in posting my line stats again. Here it is:

ADSL Link Downstream Upstream
Connection Speed 6144 Kbps 640 Kbps
Line Attenuation 46.3 dB 26.5 dB
Noise Margin 8.8 dB 11.0 dB

I have not experienced the disconnection problem for over a week now. Think I may keep the test modem.


Kind regards
 
Currently your downstream SNR (Noise) margin isn't that great. If you're experiencing stability issues, I would suggest that you try and get your SNR margin up to like 10-12dB at least.

To raise your SNR margin, you'll have to downgrade to 5Mbps or perhaps even 4Mbps.
 
You must log in or register to reply here.
Back
Top
Sign up to the MyBroadband newsletter
X