[AusNOG] DSL Line Stats

[adamn at eyemedia.com.au]

This was one I stumbled on the web sometime back, I can't find the back 
reference for it :\

SNR is Signal to Noise Ratio (aka Noise Margin or Signal to Noise Margin)
Relative strength of the DSL signal to Noise ratio. 6dB is the lowest dB 
manufactures specify for modem to be able to synch. In some instances 
interleaving can help raise the noise margin to an acceptable level. The 
higher the number the better for this measurement.
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
Loop Att. is Line Attenuation
Measure of how much the signal has degraded between the DSLAM and the 
modem. Maximum signal loss recommendation is usually about 60dB. The lower 
the dB the better for this measurement.
20dB and below is outstanding
20dB-30dB is excellent
30dB-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
Output Power
How much power modem (upstream) or DSLAM (downstream) is using. Maximum 
recommended is about 15dB. The lower the power the better for this 
measurement.

Cheers,
Adam



From:   Travis <mallik at internode.on.net>
To:     Jason Reid <jasereid at gmail.com>, 
Cc:     "AusNOG at lists.ausnog.net" <AusNOG at lists.ausnog.net>
Date:   30/09/2014 05:47 PM
Subject:        Re: [AusNOG] DSL Line Stats
Sent by:        "AusNOG" <ausnog-bounces at lists.ausnog.net>



I always thought this was a pretty good explaination:

http://www.kitz.co.uk/adsl/linestats.htm 

On 25 September 2014 17:12, Jason Reid <jasereid at gmail.com> wrote:
I'd also be interested in this.

Regards
Jason Reid


On Thursday, 25 September 2014, Jacob Kino <jacob at interconnekt.com.au> 
wrote:
Hi All,
 
Someone in our team has asked for a good document to explain DSL line 
stats, primarily in the context of interpreting wholesale DSL line stats 
reports.
 
I had a look at our carrier’s product definition document but it doesn’t 
seem to speak much about layer 1, wondering if anyone had a good reference 
they could point to, ideally that has some real world reference values in 
an Australian context.
 
Cheers,
 
Jacob
 
Jacob Kino


 
Suite 5, 25-27 Izett St
Prahran, VIC, 3181
Hi 
e-mail     jacob at interconnekt.com.au   
phone     1300 852 842
fax          03 9011 6298
www      www.interconnekt.com.au 
 


-- 
Jason Reid

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