ADSL Stats

[DUDE!@##$%%]

Recently I've been having massive ping spikes and VAR in CS:GO
I started monitoring internet usage to find out what was causing it, finally went into the router itself to check the ADSL stats and I see that:

line attenuation: 47.56 dB
Noise Margin: 6.2 dB

the attenuation seems to be fine but the noise margin is pretty terrible and must be causing the intermittent sync issues and spikes (according to my limited knowledge). Am I correct in saying that the noise issue is a physical aspect/fault of the line and that telkom are the correct people to contact in order to get it fixed?

what else can cause the noise margin to decrease? I've only noticed this now, I don't even know how long its been syncing at 6dB or if it was ever higher in the first place. I might need to phone telkom and ask them to lower me from my measly 6mb to a 4mb RIP

 

[Johnatan56]

Recently I've been having massive ping spikes and VAR in CS:GO
I started monitoring internet usage to find out what was causing it, finally went into the router itself to check the ADSL stats and I see that:

line attenuation: 47.56 dB
Noise Margin: 6.2 dB

the attenuation seems to be fine but the noise margin is pretty terrible and must be causing the intermittent sync issues and spikes (according to my limited knowledge). Am I correct in saying that the noise issue is a physical aspect/fault of the line and that telkom are the correct people to contact in order to get it fixed?

what else can cause the noise margin to decrease? I've only noticed this now, I don't even know how long its been syncing at 6dB or if it was ever higher in the first place. I might need to phone telkom and ask them to lower me from my measly 6mb to a 4mb RIP

At 48dB your max is about 4Mbps stably as a norm.

 

[RyanPCMR]

Using this calculator, it shows that you can achieve 5Mbps. https://fremnet.net/article/216/adsl-theoretical-speed-calculator

 

[beesboertjie]

Hi RyanSr. I find this graph as reliable as your calculator. If DUDE!@# is on ADSL1, the calculator says he can get 5432 kbps (5,3 Mbps) with his line attenuation being 47,56 dB.

The graph says pretty much the same thing.



Hi DUDE!@#. Sorry to say, at 3,4 km you are damn far away from the exchange, which is clearly illustrated by the graph. Anything more than 2 km is not good.

 

[Gordon_R]

Are you really that far from the exchange, and was your line quality good until recently? The attenuation on the chart is a theoretical value, and may not reflect real-world performance.

In particular, poor quality joins and connections (including those inside your home), may cause losses. Interference from neighbours on the same route to the exchange may also occur. Because of these factors, statistics are not fixed, and should be monitored over time.

ADSL routers can deal with intermittent noise, but the margin on your line is so low, that you will get interruptions and retransmission. 6dB is the minimum, closer to 12dB is ideal.

ADSL signals are made up from a number of separate channels, each experiencing differing levels of noise. Your router will try to optimally allocate those, to match the bandwidth on your profile. Lowering your synch speed will result in a much more stable line, since the worst channels can progressively be discarded as too noisy.

Fixing your line quality would be the ideal solution, but in reality this may be impossible to achieve, without replacing all the copper cables. Our block was very fortunate to have this done, and my line attenuation is 27.5dB, which matches the 2km distance from the exchange.