See my stats above ^^^
Edit: Feo I meant your upstream noise margin, not down.
i dont understand it ,
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What should i sync at?
- Thread starter matrixweb
- Start date
i dont understand it ,
stocksie
Well-Known Member
0.5km from Exchange
Item Downstream Upstream Unit
SNR Margin 18 14 dB
Line Attenuation 15 6 dB
Data Rate 4096 384 kbps
Just got work on the upstream data rate
Item Downstream Upstream Unit
SNR Margin 18 14 dB
Line Attenuation 15 6 dB
Data Rate 4096 384 kbps
Just got work on the upstream data rate
0.5km from Exchange
Item Downstream Upstream Unit
SNR Margin 18 14 dB
Line Attenuation 15 6 dB
Data Rate 4096 384 kbps
Just got work on the upstream data rate
lol not a post to say what you got but to try and help me by giving a rough idea of what i should sync at
See my stats in an above post....
fz1
Senior Member
The higher the noise margin, the better. The lower the attenuation, the better.
Unfortunately, matrixweb, your line stats are very poor. From what I have read, about 6dB of downstream margin is the cut-off point for a stable connection. So, you are already running at about as quick as you can get out of your line. Any faster, and you will have constant problems because as the synch speed increases, the noise margin decreases. I believe the exchange automatically determines what the best tradeoff is for you - i.e., the fastest speed that will give you at least a 6dB noise margin. So, it tried to give you a 4Mbps synch, but had to downgrade until it found 2Mbps as (theoretically) stable.
Any idea how far you are from your exchange? If you are not very far, bad wiring may be a cause of poor figures. I know that because recently a Telkom technician was out fixing my other, non-ADSL line, and in the process, he messed up my DSL line (while doing all sorts of splicing and re-joining of wires... I HATE that they do that instead of replacing a wire). I know this, because I was expecting him to and was running a program called RouterStats to monitor my line's statistics while he was working. If I had not done that, he would have left my non-functional line working (great!) but my DSL line with attenuation figures of over 50dB and noise margin figures under 10dB (dismal!). I immediately told him he had messed up my line and he worked on it (again, splicing and re-joining), getting it back to ~25dB noise margin and under 20dB attenuation.
See this post for "ideal" ranges for noise margin and attenuation: http://mybroadband.co.za/vb/showpost.php?p=1239914&postcount=7
feo: you have a great line. I'm jealous of your 640Kbps upstream synch
What kind of problems are you experiencing, and have you always been experiencing them? My ADSL has been a little wonky tonight - at one point, it was down completely for 10 minutes, and the entire day I have had fluctuating noise margins on my line. Have you used a program like RouterStats to monitor your noise margin and attenuation figures constantly? Perhaps they are fluctuating wildly and that is causing problems...
Unfortunately, matrixweb, your line stats are very poor. From what I have read, about 6dB of downstream margin is the cut-off point for a stable connection. So, you are already running at about as quick as you can get out of your line. Any faster, and you will have constant problems because as the synch speed increases, the noise margin decreases. I believe the exchange automatically determines what the best tradeoff is for you - i.e., the fastest speed that will give you at least a 6dB noise margin. So, it tried to give you a 4Mbps synch, but had to downgrade until it found 2Mbps as (theoretically) stable.
Any idea how far you are from your exchange? If you are not very far, bad wiring may be a cause of poor figures. I know that because recently a Telkom technician was out fixing my other, non-ADSL line, and in the process, he messed up my DSL line (while doing all sorts of splicing and re-joining of wires... I HATE that they do that instead of replacing a wire). I know this, because I was expecting him to and was running a program called RouterStats to monitor my line's statistics while he was working. If I had not done that, he would have left my non-functional line working (great!) but my DSL line with attenuation figures of over 50dB and noise margin figures under 10dB (dismal!). I immediately told him he had messed up my line and he worked on it (again, splicing and re-joining), getting it back to ~25dB noise margin and under 20dB attenuation.
See this post for "ideal" ranges for noise margin and attenuation: http://mybroadband.co.za/vb/showpost.php?p=1239914&postcount=7
feo: you have a great line. I'm jealous of your 640Kbps upstream synch
What kind of problems are you experiencing, and have you always been experiencing them? My ADSL has been a little wonky tonight - at one point, it was down completely for 10 minutes, and the entire day I have had fluctuating noise margins on my line. Have you used a program like RouterStats to monitor your noise margin and attenuation figures constantly? Perhaps they are fluctuating wildly and that is causing problems...
Last edited:
Downstream Upstream
SNR Margin 6.0 dB 14 dB
Line Attenuation 63.5 dB 31.5 dB
CRC Errors 0 0
Latency Fast Fast
im syncing stable on 2.9**mbps so thats good but when the alarm is disconnected im syncing at 3.***mbps so what were you'll saying about my line being pathetic?
SNR Margin 6.0 dB 14 dB
Line Attenuation 63.5 dB 31.5 dB
CRC Errors 0 0
Latency Fast Fast
im syncing stable on 2.9**mbps so thats good but when the alarm is disconnected im syncing at 3.***mbps so what were you'll saying about my line being pathetic?
fz1
Senior Member
Huh?
Is your alarm connected to your telephone line?
How do your line statistics change (or rather, what do they change to) with your alarm disconnected?
Your line isn't "pathetic" since you can still synch (it would be pathetic if you weren't able to use ADSL at all). It's quite poor, though, because you can't get the full 4Mbps (and beyond when faster speeds are released), and your attenuation figures are very high (resulting in low SNR figures).
However, I notice that your CRC errors are 0. What is the uptime of your router? I ask because CRC errors are more common on the poor lines, and I believe the error count is only reset when you restart your router. If your error count is 0 and your router has been running for a while, that's good news because your line did not generate any errors while you were connected. To give you perspective, my line, synching at 4Mbps/512Kbps (26dB noise margin / 18dB attenuation downstream) has generated about 200 CRC errors in the last 48 hours.
Is your alarm connected to your telephone line?
How do your line statistics change (or rather, what do they change to) with your alarm disconnected?
Your line isn't "pathetic" since you can still synch (it would be pathetic if you weren't able to use ADSL at all). It's quite poor, though, because you can't get the full 4Mbps (and beyond when faster speeds are released), and your attenuation figures are very high (resulting in low SNR figures).
However, I notice that your CRC errors are 0. What is the uptime of your router? I ask because CRC errors are more common on the poor lines, and I believe the error count is only reset when you restart your router. If your error count is 0 and your router has been running for a while, that's good news because your line did not generate any errors while you were connected. To give you perspective, my line, synching at 4Mbps/512Kbps (26dB noise margin / 18dB attenuation downstream) has generated about 200 CRC errors in the last 48 hours.
It shouldnt if you have a filter connected to it
i do but it still drops with the alarm
dont have