Broadband Related > ADSL Issues

Help with SNR and lost sync

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colchaodemola:
Well guys , at first i was so happy that finally some ISP had started to deliver broadband in my area, but i only get problems during day.
Before put ADSL here , i had no idea about SNR and line attenuation , but after that i started to read some explanations [thank you guys in this forum].
I have a constant problem with low snr between 11am and 5pm and a lot drops in connection , i mean A LOT .
During 5pm-11am i have an almost constant SNR margin = 12 , my attenuation is very high too ~51. While SNR=12 i can sync at 4512/512 but suddenly [not that suddenly anymore since i know almost the right hour that happens]  my snr drops to ~3.9 after 11am and the problems begin. A lot of CRC ERRORS , lose syncs , and related problems, mainly a big throughput loss. I call my ISP and apparently they support staff are dumb, they appear not even know what SNR is :/ , they just keep saying the line is OK , and ask  me if i am not connecting the modem in the computer`s modem port insted the ethernet port [WTF , they really think i can connect a RJ45 in a RJ11 port????? ].
I can not change ISP , `cause they are the only broadband ISP around here.
After read a few topics here  i am thinking in get a netgear DG834 and with some lucky my problems with drops will at least get better. But i have a doubt , sould i take version 1 , 2 or 3 ? Which one is better with low snr ??? 
Thanks.   

roseway:
Hi, and welcome to the forum.

An attenuation of 51 dB is quite high but should be perfectly usable. However, interference can be a problem, and this is what you seem to be suffering from. If the problem always happens at about 11:00 am then that strongly suggests a serious local source of interference from some machinery which starts up at that time. Do you, or any of your neighbours, have something like that (an exercise treadmill for example)?

You may be able to get an improvement by giving attention to your own wiring and connections - see http://www.kitz.co.uk/adsl/lowSNR.htm for some guidance.

Eric

colchaodemola:
Now i`ve learned one new english word = "treadmill" , thanks google :)
Well, i really do not know , i live in in a building / fourth floor , i know my neighboor downstairs does not have one , and the neighboor next door neither.
i tried to look at the page you post , [i have alread looked before], but here in Brazil , telephone plugs are not like that. They are like this:
http://imgproduto.casaevideo.com.br/gif/telefixo/0264504.gif

What about the DG834 ? Will it help ? Which is the best version ?

roseway:
I'm afraid I don't know anything about the Brazilian system, but the same principles of internal wiring and interference pickup will apply. One of the DG834 series routers might help, as they are notable for their ability to hold sync at low noise margins. However it's quite unusual to have a regular big daytime drop in the noise margin (it usually drops at night for most people) and this definitely points at the probability of local electrical interference. If you can't trace the source of the interference, then you might be able to get an improvement by attention to your internal wiring (if that's permitted where you are) or by trying different ADSL filters.

Eric

colchaodemola:
Could you recommend a very good adsl filter ?

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