Broadband info

  picklefactory 18:21 24 Oct 06
Locked

Just a note for anyone who, like me, doesn't really understand all the guff that my modem tells me, and can have a hefty effect on broadband performance. I found this on another forum from person unknown, so not my own work.
Hope it's of use to some of you.

Noise Margin (AKA Signal to Noise Margin or Signal to Noise Ratio)
Relative strength of the DSL signal to Noise ratio. The higher the number the better for this measurement. In some instances interleaving can help raise the noise margin to an acceptable level.

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 little or no synch problems* (but see note below)
20dB-28dB is excellent
29dB or above is outstanding

* Note that there may be short term bursts of noise that may drop the margin, but due to the sampling time of the management utility in your modem, will not show up in the figures.

Line Attenuation
Measure of how much the signal has degraded between the DSLAM and the modem. This is largely a function of the distance from the exchange. 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

DSL Rate ***/tx/rx/Rate
The actual service data rate that your ISP has provisioned.

Attainable Line Rate
This is the maximum rate at which your modem can connect to the DSLAM if there was no service provisioning limiting the bandwidth. The higher the number the better.

Occupancy
Occupancy is the percentage of line capacity used. Each DSL line is capable of a certain maximum speed or "capacity" dependant on line distance and other varying factors. The occupancy is an expression of your current sync rate setting over your maximum capacity. There are occupancy rates for both upload and download. The lower the figure, the better. Because of error correction and other factors in the DSL protocols, a margin is required so that a connection can be maintained under varying line conditions. If the occupancy approaches 100%, any interference can cause the ADSL sync to be lost. A useful measurement to monitor when sync problems occur. [AFAIK the billion SNMP utility does not give a direct measurement of occupancy :-( ]

(with due acknowledgment of the other sources/forum that this info was gleaned from)

  gartoye 20:03 24 Oct 06

Cheers pickle Ive got Tautology Bandwidth Monitor (free off the web) but dont know what the hell its telling me apart from the MB per sec!

  Stuartli 20:07 24 Oct 06

It tells you pretty well everything...:-)

  Dipso 22:47 24 Oct 06

Tautology Bandwidth Monitor is a usage monitor so AFAIK it doesn't give you info like your noise margin, attenuation, connection rate which picklefactory is referring to.

picklefactory - How is the new router bearing up? Has your line settled down and what stats are you getting now?

There's just one part that I can't concur with. My SNR is regularly 6dB which according to the above "is bad and will experience no synch or intermittent synch problems", however according to my routers stats I have had no loss of sync and very few errors. If it actually says SNR Margin (which my Netgear does), then it's interpreted that it's how much "spare" signal you've got over the minimum required to maintain reliable sync, and should be able to go to zero, or even slightly negative, without problem. I have seen 2dB occasionally but never negative but I know others that have and still remained in sync.

  Stuartli 22:52 24 Oct 06

You are right - I was thinking that throughput figures were required...:-(

  picklefactory 09:36 25 Oct 06

DSL Status: Up
DSL Modulation Mode: GDMT
DSL Path Mode: INTERLEAVED
Downstream Rate: 5440 Kbps
Upstream Rate: 448 Kbps
Downstream Margin: 14 db
Upstream Margin: 19 db
Downstream Line Attenuation: 42
Upstream Line Attenuation: 23
Downstream Transmit Power: 0
Upstream Transmit Power: 0

  picklefactory 09:39 25 Oct 06

Haven't posted back re: my router as I'm that busy just now, haven't had chance to bugger about with it in different places. Seem pretty settled at below sync speed, can't get on BT tester just now to show you stats from there, but again seems settled. I'll try and repost later on.

DSL Status: Up
DSL Modulation Mode: GDMT
DSL Path Mode: INTERLEAVED
Downstream Rate: 5440 Kbps
Upstream Rate: 448 Kbps
Downstream Margin: 14 db
Upstream Margin: 19 db
Downstream Line Attenuation: 42
Upstream Line Attenuation: 23
Downstream Transmit Power: 0
Upstream Transmit Power: 0

  picklefactory 09:39 25 Oct 06

Probably should have continued that conversation in my original thread

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