Con esa atenuacion deberias de aspirar a un par de megas mas,fijate en mis datos con 33 de atenuacion sincroniza a 16 megas,pero cada linea es un mundo.Statistics -- ADSL
Mode: ADSL2+
Line Coding: Trellis On
Status: No Defect
Link Power State: L0
Downstream Upstream
SNR Margin (dB): 8.9 9.5
Attenuation (dB): 33.5 12.7
Output Power (dBm): 896.0 0.0
Attainable Rate (Kbps): 16272 19112
Rate (Kbps): 16058 874
MSGc (number of bytes in overhead channel message): 60 9
B (number of bytes in Mux Data Frame): 244 111
M (number of Mux Data Frames in FEC Data Frame): 1 1
T (Mux Data Frames over sync bytes): 2 1
R (number of check bytes in FEC Data Frame): 10 16
S (ratio of FEC over PMD Data Frame length): 0.4872 4.0635
L (number of bits in PMD Data Frame): 4187 252
D (interleaver depth): 64 8
Delay (msec): 7 8
Super Frames: 150233 150231
Super Frame Errors: 146 29
RS Words: 19830798 10215708
RS Correctable Errors: 116926 32
RS Uncorrectable Errors: 6790 N/A
HEC Errors: 113 243
OCD Errors: 5 0
LCD Errors: 0 0
Total Cells: 91492527 4971379
Data Cells: 66696 19737
Bit Errors: 0 0
Total ES: 60 2
Total SES: 6 1
Total UAS: 39 0
Esto es con el firm r04 de jazztel,con el netcomm,un poco menos,pero la subida a 1000.Estoy a 1300 metros de la central aunque mi linea tiene ya 18 años,ya es mayor de edad :-P