Esto es lo que me da en la página para calcular la distancia de la central:
Modalidad 20 Mbps
991.73 KB/s Contrata tu linea ADSL
Operador Modalidad 6 Mbps
74 KB/s Contrata tu linea ADSL
Operador Modalidad 2 Mbps
141 KB/s Contrata tu linea ADSL
Operador Modalidad 1 Mbps
61.5 KB/s Contrata tu linea ADSL
Estos los valores del router Thomson Speedtouch con telefónica:
Uptime: 0 days, 8:55:39
DSL Type: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 248 / 1.020
Data Transferred (Sent/Received) [MB/MB]: 6,79 / 49,30
Output Power (Up/Down) [dBm]: 12,0 / 0,0
Line Attenuation (Up/Down) [dB]: 10,0 / 23,5
SN Margin (Up/Down) [dB]: 34,5 / 30,5
Vendor ID (Local/Remote): TMMB / GSPN
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 0 / 0
FEC Errors (Up/Down): 1 / 207
CRC Errors (Up/Down): 1 / 0
HEC Errors (Up/Down): 0 / 0
Distancia de la central 900 m.