Adsl Modem/Router keeps losing sync

[Dirk_G]

Hey there.

I have a netgear 834gt modem. Near the beginning of the year I had problems that every 20-30 minutes the line would drop and i'd have to manually go into the router and tell it to authenticate again. (annoying)

Now I am still on 4-12Mb and the line drops every 3-5 seconds. Its totally unusable.
I reported a line fault 3 times and each time they do something and it works for a few hours and then goes back to dropping all the time. Lately they dropped the line speed to 4Mb and it worked for a day and now also keeps losing sync every 5 seconds. each time it reconnects at a different speed, but only for 5 secs.

I am just going to see if theres a newer firmware for the netgear.
Does this sound like a modem fault or telkom line fault.
Any help would be appreciated cos i'm lost without internet and using gprs on my cell is near useless.

Thanks
Dirk.

More info

ADSL Link Downstream Upstream
Connection Speed 4092 kbps 507 kbps
Line Attenuation 6.1 db 7.8 db
Noise Margin 49.5 db 27.4 db

 

[hashbrown99]

Have you tried another modem/router?

I had the same issue with the same router - went away when I bought another router

 

[UnUnOctium]

That's some excellent SNR you have there. Brand spanking new line right to the DSLAM 20 m away?

 

[cryptic1]

That's some excellent SNR you have there. Brand spanking new line right to the DSLAM 20 m away?

I don't mean to de-rail but being a noob to adsl alerted me to your comment. How does my resullts compare, what does this mean? I only know dload speeds and that's about it:

Rate (Kbps): 4096 511
SNR Margin (dB): 20.6 12.0
Attenuation (dB): 35.0 22.0

 

[Dirk_G]

Well it seems my router has died. I tried to flash it to the latest firmware and its pretty much dead now. All lights are flashing and i can't access it. Tried to reset it but nothing.
Picked up a friend's router which is exactly the same and it synced at 3.5Mb and so far is stable. If this line stays up longer then an hour and after a reboot stays up again then i'll just buy another netgear router. Unless you can recommend something better with same features.
UnUnOctium the DSLAM is about 2kms away

New stats are:

ADSL Link Downstream Upstream
Connection Speed 3691 kbps 507 kbps
Line Attenuation 48.5 db 28.7 db
Noise Margin 7.0 db 11.6 db

Thank you
Dirk

 

[Pada]

Dirk, I reckon with a better router you should be able to get a STABLE 4Mbps connection.

Me and my colleagues did router benchmarking tonight at our office:

Telkom says its about 2.9km from the exchange.
We are currently synchronizing at 1024kbps down/512kbps up due to the poor SNR margin on our Cisco 877.
The SNR values that we got on the down link are as follow:
Cisco 877: 12.5dB
D-Link DSL-2500U: 21.8dB
Telkom Marconi: 29.9dB​

Before this test, I thought that the D-Link DSL-2500U would give the best results, but clearly the ancient Telkom Marconi (4x 100Mbps + 1x ADSL - no wireless) routers are still the best by a MASSIVE margin!

 

[UnUnOctium]

I don't mean to de-rail but being a noob to adsl alerted me to your comment. How does my resullts compare, what does this mean? I only know dload speeds and that's about it:

Rate (Kbps): 4096 511
SNR Margin (dB): 20.6 12.0
Attenuation (dB): 35.0 22.0

Ideal situation = high SNR and low attenuation. 20 dB on 4 mbit is perfectly stable, you shouldn't be having any problems.

Well it seems my router has died. I tried to flash it to the latest firmware and its pretty much dead now. All lights are flashing and i can't access it. Tried to reset it but nothing.
Picked up a friend's router which is exactly the same and it synced at 3.5Mb and so far is stable. If this line stays up longer then an hour and after a reboot stays up again then i'll just buy another netgear router. Unless you can recommend something better with same features.
UnUnOctium the DSLAM is about 2kms away

New stats are:

ADSL Link Downstream Upstream
Connection Speed 3691 kbps 507 kbps
Line Attenuation 48.5 db 28.7 db
Noise Margin 7.0 db 11.6 db

Thank you
Dirk

I see that on the first stats you posted either you or your router had mixed up the SNR and attenuation (and consequently swapped the lables), at that SNR of 7 dB, you'll be dropping each time lightning strikes nearby.

 

[Pada]

I see that on the first stats you posted either you or your router had mixed up the SNR and attenuation (and consequently swapped the lables), at that SNR of 7 dB, you'll be dropping each time lightning strikes nearby.

Yeah, I would also think that Dirk_G mixed the SNR & line attenuation values in the original post, because it's almost impossible to lose sync with those values posted orignally!

 

[Griz]

soz posted in wrong thread