Line attenuation is a measure of how much the signal has degraded between the DSLAM and the modem. This is largely a function of the distance from the exchange. The lower the dB, the better for this measurement. Attenuation is logarithmic and each 3dB of attenuation halves the strength of the signal power received.
20dB and below is outstanding
20dB-30dB is excellent30dB-40dB is very good
40dB-50dB is good
50dB-60dB is poor and may experience connectivity issues
60dB or above is bad and will experience connectivity issues
The standard signal attenuation spread for a given speed is somewhere in the region of 15-20dB for ADSL2/2+ speeds and 25-30dB for ADSL1 speeds. The following is a "guesstimate" of the line attenuation and maximum attainable speed based on distance:
Less than 1km = 24Mbit
1.0km = 13.81dB = 23Mbit
1.5km = 20.7dB = 21Mbit2.0km = 27.6dB = 18Mbit
2.5km = 34.5dB = 13Mbit
3.0km = 41.4dB = 8Mbit
3.5km = 48.3dB = 6Mbit
4.0km = 56dB = 4Mbit
4.5km = 62.1dB = 3Mbit
5.0km = 69dB = 2Mbit
source As you say something isn't right ?
The downstream is out of this world Attenuation:
12.3, 11.3 dbThe upstream is excellent Attenuation:
25.2, 25.1 dbNot sure i need to check but i think those numbers should be closer to being the same (Attenuation)
After a bit of reading your SNR may be your problem for the drop outs.Downstream
Noise 6.4, 6.1Higher SNR/SNR margin numbers repesent cleaner/stronger signals, with less background noise. The higher the SNR margin the more stable the connection. In some instances interleaving can help raise the noise margin to an acceptable level.
6dB or below noise margin is bad, it will experience no synch or intermittent synch problems7dB-10dB is fair but does not leave much room for variances in conditions
11dB-20dB is good with little or no synch problems (if no large variation)
20dB-28dB is excellent
29dB or above is outstanding
Note that there may be short term bursts of noise that may drop the margin, but due to the sampling time of the management utility in your modem, will not necessarily show up in its interface.
source Note: For DSL, the further you are from the exchange, the lower your SNR and the higher your attenuation will be.I need sleep now lol