Just trust me when I say if you have above 40 LA you going to have trouble with WOW. Its just the way Wow works its data. Not going into finer detail but you will have problems.
Same if you have lower than 11dB (upstream). Ow and u ideally want MORE than 20dB downstream
You can start @ your house and upload extra phone lines, fax machines and such **** that degrade your signal quality.
This line of mine looks like this & its awesome quality:
ADSL Link Downstream Upstream
Connection Speed 4096 kbps 512 kbps
Line Attenuation 16.0 db 8.0 db
Noise Margin 28.3 db 14.0 db
Maybe the following can give you a better idea of things:
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Line Attenuation
Line attenuation is an indicator of line health. ADSL, Line Attenuation is the energy loss of signal transmission through the phone line.
Several things can cause higher line attenuation, including…
Distance from the exchange
Type of cable & gauge of wire
Phone line joins, such as wire connectors
Additional phone points
Star wiring
Corrosion on your phone line
The lower the line attenuation, the better.
20bB. and below = Outstanding
20dB-30dB. = Excellent
30dB-40dB. = Very Good
40dB-50dB. = Good
50dB-60dB. = Poor and may experience connectivity issues
60dB and above = Bad and will experience connectivity issues
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SNR Margins (Signal to Noise Ratio Margins)
Signal to Noise Ratio simply refers to how loud the signal is over background noise. The higher the SNR margin, the more stable the connection because of fewer errors.
A strong signal will allow the line to cope with faster speeds.
In general, a higher signal to noise ratio will result in less errors.
6bB. or below = Bad and will experience no line synchronisation or intermittent synchronisation problems.
7dB-10dB. = Fair but does not leave much room for variances in conditions.
11dB-20dB. = Good with little or no synchronisation problems
20dB-28dB. = Excellent
29dB. or above = Outstanding
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Calculating your distance from the exchange
A handy equation that we use is to divide the downstream attenuation by 13.81. This will give you a fairly accurate distance from the exchange measured in kilometres.
For example; if you had a downstream attenuation of 30dB…
30dB divided by 13.81 = 2.172 KM
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Poor quality wiring
Line health will be dependent on the existing phone cabling.
Energy is required for ADSL signals to travel along phone cables and turn corners. Therefore, more phone cables / extensions (Star wiring) or phone points connected to the line will result in a poorer quality ADSL phone line or higher line attenuation.
The same goes for corrosion on the line. The more corrosion, the higher the resistance resulting in a poorer quality signal.
The best way to ensure the best quality signal is to have one phone point wired to standard or install a good quality Central / Remote Splitter .
A Central / Remote Splitter will allow many phone line extensions without interference of the ADSL signal to the modem.