Подскажите, пожалуйста, где можно посмотреть описание параметров линии ADSL. Мой dsl-2740U выдает такие параметры:

Downstream Upstream
SNR Margin (dB): 10.7 25.3
Attenuation (dB): 8.0 2.2
Output Power (dBm): 0.0 12.0
Attainable Rate (Kbps): 19044 1244
Rate (Kbps): 10238 764
MSGc (number of bytes in overhead channel message): 60 10
B (number of bytes in Mux Data Frame): 20 109
M (number of Mux Data Frames in FEC Data Frame): 1 1
T (Mux Data Frames over sync bytes): 15 1
R (number of check bytes in FEC Data Frame): 16 0
S (ratio of FEC over PMD Data Frame length): 0.0654 4.5596
L (number of bits in PMD Data Frame): 4524 193
D (interleaver depth): 224 1
Delay (msec): 3 1
Super Frames: 4025 4023
Super Frame Errors: 4 0
RS Words: 3985448 0
RS Correctable Errors: 26181 0
RS Uncorrectable Errors: 5 N/A
HEC Errors: 2 0
OCD Errors: 0 0
LCD Errors: 0 0
Total Cells: 1551438 111123
Data Cells: 711589 1702
Bit Errors: 0 0
Total ES: 2442 0
Total SES: 2305 0
Total UAS: 328 0

Как-то смущает Output Power = 0 на даунлоад, что это значит?