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ADSL Modem SNR Margin
by Planet Lowyat on 16/09/08 at 11:26 pm
Yesterday one of the TMnet Streamyx contractor went to my house checking for my streamyx problem and during our discussion he was told me about the ADSL Modem SNR Margin.
Basically the SNR margin is the amount of signal your line can see as opposed to how much noise it can hear. The higher your SNR figure then the better your line quality and therefore a higher chance of getting faster internet speeds.
I found the figure as below on Lowyat Forum:
6dB or below is bad and will experience no synch or intermittent synch problems
7dB-10dB is fair but does not leave much room for variances in conditions
11dB-20dB is good with no synch problems
20dB-28dB is excellent
29dB or above is outstanding
Look at the number which I get = “31″.
The contractor told me that he never see SRN Margin above 40 so far and if you’re lucky you can get 30 and above. Am I lucky?
Again he advised me to get ADSL modem with ADSL 2+ features for better performance. Too bad I’m still having an old D-Link ADSL modem which is only have ‘multi-mode’, ‘G.dmt’, ‘G.lite’ and ‘ T1.413′ Somehow multi-mode will not work in my new place here.
He tested with his ADSL 2+ modem using TMnet Speedometer and he is getting >1200 Kbits per sec consistently and my old D-Link modem getting around 800 – 1099 Kbits per sec only.
Believe it or not? How about you?
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7 Comments
Crazyfool
Sep 17th, 2008
update the modem bios la! then will be 2+ .. simple and easy ..
jolene
Sep 17th, 2008
i wonder who’s the person who told u.. was it me?
Planet Lowyat
Sep 17th, 2008
Thanks Crazyfool. I have latest D-Link DSL 500-T firmware installed and there is NO ADS2/ADSL2+
azrin
Sep 17th, 2008
Signal to Noise Ratio SHOULD BE LOWER. The smaller the number, the better (check the laws on DECIBELS if you don’t trust me)
Anyway, DLink can’t get the top speeds now as it lacks the ARP and NBT routing tables and thus what you have is just a normal stack modem – hub.
Linksys is built in, because it’s CISCO and more reliable. I got my line speed of 28Megabytes and well, download of 30GB last night of video (M4V) takes less than 45 mins!~
azrin
Sep 17th, 2008
Oh yes… Gain loss should be in negative as opposed to positive. So check your lines..or ask the contractor to trace your node.
azrin @ http://www.azrin.net
Jimmy
Nov 26th, 2008
SNR Should be higher you twat not lower.
sonofusion82
Jan 28th, 2009
bro azrin, you sounds knowledgeable but your idea of SNR is entirely wrong, http://en.wikipedia.org/wiki/Signal-to-noise_ratio
yes, dB values are logarithmic, when used for absolute power values like transmit or received power and the value is negative, -5dB is higher/better than -10dB, but for positive values, +5dB is less than +10dB.
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