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[L4ky]

Hi, i'm L4ky from Italy.

My line was working well for a few years, i got about 11.5Mbps and 1.05 Mbps upload.
Here are my stats:
SNR Margin (dB)   4.3   5.5
Attenuation (dB)   38.5   18.4

Suddenly, about at 10th January something happened and my adsl couldn't get more than 6.5Mbps !

I unlocked a broadcom router so i could get QLN and HLOG graphs.

I will post Tones allocation, QLN and HLOG when the line was good and then the line is bad.

Tone allocation GOOD:

http://i.imgur.com/kK65kkv.png
QLN GOOD:

http://i.imgur.com/THts5Ix.png
HLOG GOOD:

http://i.imgur.com/Q2Pb64j.png

Tone allocation BAD:

http://i.imgur.com/BadooST.png
QLN BAD:

http://i.imgur.com/6gYHNuI.png
HLOG BAD:

http://i.imgur.com/9kf9rmR.png

As you can see the GOOD graphs was taken some days ago. The line worked good for about 2 o 3 hours only that day, but after that it got worse.

Could you help me finding the source of this noise?

The ADSL2+ DSLAM is 2.4 Km about from my home, there is just ONE closet between me and the dslam. A isp technician tested at the closet and with golden modem he could get all 11600 Kbps ( max downstram rate, i have 10Mb commercial limit ).

My ISP says "Line was degraded. We can do nothing." they're obviously lazy people who don't want to solve my problem.


EDIT: I noticed i wrote wrong screenshot link. Now they're fixed

[konrado5]

L4ky: you attached both good graphs (the same files) for Tone allocation and QLN.

[L4ky]

L4ky: you attached both good graphs (the same files) for Tone allocation and QLN.

Yeah sorry, i fixed now!

[konrado5]

You have huge Radio Frequency Interference or EMI on tones 200-250 (862.5 Khz-1078.125 kHz) and smaller interference on tones 125-175 (539.0625 Khz-754.6875 Khz).
Perhaps this page will be helpful.
http://www.kitz.co.uk/adsl/rein.htm

[L4ky]

You have huge Radio Frequency Interference or EMI on tones 200-250 (862.5 Khz-1078.125 kHz) and smaller interference on tones 125-175 (539.0625 Khz-754.6875 Khz).
Perhaps this page will be helpful.
http://www.kitz.co.uk/adsl/rein.htm

I already read it, but how can i track the source? I have no portable AM radio.. and i should track the source between my home and the closet! ( about 1.2 Km )

[Moderator edited to fix the broken [/quote] tag.]

[Weaver]

@L4Ky - hi L4ky, welcome to the forums!

[L4ky]

@L4Ky - hi L4ky, welcome to the forums!

Thank you very much 

[L4ky]

Today i made a quick test.

I needed to go out with my car, so i set my car radio to MW at 900KHz.. and as soon as i got to my house gate " BOOM ". A huge noise !
I passed some times to identify the range of this noise and i think it comes from one of the two street lights in front of my house!
They are LED light, about 2 years old..

Since the phone cable are not underground but are "flying" i think something works as antenna and get this noise.

Now i just have to proof this theory and notify this to my town major, so he can call the assistance to fix this problem.

Suggestion to make some valid evidences?