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[yousaf465]

what do you make of this ? It is a "upto 20mbps" package. Downstream is mere 169Kbps 

DSLAM/MSAN type:   BDCM
DSL mode:          G.992.3 Annex A
Status:            DSL Link Up
Uptime:            0 days, 2:59:49
         
            Downstream   Upstream
Attenuation (dB):          42.5      28.6
Connection speed (kbps):   169      509
SNR margin (dB):           6.8      15.2
Power (dBm):               12.0      0.4
Interleave depth:          8      0
INP:                       3.25      3.16

RSCorr/RS (%):                   
RSUnCorr/RS (%):                 
ES/hour:                   17.3      0

[yousaf465]

Update, just removed the internal wiring and faceplate. New stats, but it still gets disconnected if somebody
touches the drop wire.
DSLAM/MSAN type:   BDCM
DSL mode:          G.992.5 Annex A
Status:            DSL Link Up
Uptime:            0 days, 1:40:49
         
            Downstream   Upstream
Attenuation (dB):          46.0      28.7
Connection speed (kbps):   6048      509
SNR margin (dB):           5.0      14.9
Power (dBm):               19.6      0.4
Interleave depth:          64      0
INP:                       2.05      3.16

RSCorr/RS (%):                   
RSUnCorr/RS (%):                 
ES/hour:                   33.0      0

[roseway]

it still gets disconnected if somebody touches the drop wire.

That sounds like a bad connection in the drop wire. You'll have to report it to your ISP.

[yousaf465]

Dropwire was replaced with a new dropwire which is slightly longer than the previous one. First modem was unable to get any DSL link . We removed some length of the new wire. Now I can't get more than ~3000kbps.

DSLAM/MSAN type:   BDCM
DSL mode:          G.992.5 Annex A
Status:            DSL Link Up
Uptime:            0 days, 0:18:13
         
            Downstream   Upstream
Attenuation (dB):          46.5      29.0
Connection speed (kbps):   2858      509
SNR margin (dB):           6.8      16.2
Power (dBm):               19.1      0.4
Interleave depth:          32      0
INP:                       2.14      3.16

RSCorr/RS (%):                   
RSUnCorr/RS (%):                 
ES/hour:                   0      0

3 graphs are attached.

[roseway]

There's a great big hole in the bitloading over tones ~100 - 160 (~400 kHz - 700 kHz), which is presumably responsible for the poor performance. This suggests severe interference in that frequency range. The QLN graph might shed more light on the problem. Are there any factories or other large users of electrical equipment nearby?

[yousaf465]

this is a "    Technicolor Gateway TG788Avn" modem. QLN grayed out in DSLstats. 

Exchange is next to local power station, can't do anything 

[JGO]

"Exchange is next to local power station, can't do anything" 

You don't have to put out the welcome mat though ! 
I suggest a parallel mode rejection device such as the BT RF3 to reduce induced/radiated pickup on the phone line and a power line filter for your modem are possible attacks, assuming you have already dealt with the ring wire.

[yousaf465]

New Stats

DSLAM/MSAN type:   BDCM
DSL mode:          G.992.5 Annex A
Status:            DSL Link Up
Uptime:            1 day, 22:29:32
         
            Downstream   Upstream
Attenuation (dB):          45.5      28.6
Connection speed (kbps):   5190      509
SNR margin (dB):           6.5      15.1
Power (dBm):               19.8      0.4
Interleave depth:          64      0
INP:                       2.04      3.16

RSCorr/RS (%):                   
RSUnCorr/RS (%):                 
ES/hour:                   20.7      0