Noise/Line Attenuation

C

ChrisGeo

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Hi
Id just like to know if these values seem correct.
Did the self install today so I just want to make sure everything is running well

ADSL Link Downstream Upstream
Connection Speed 384 kbps 128 kbps
Line Attenuation 44.5 db 26.0 db
Noise Margin 21.8 db 18.0 db

Using a Netgear n300

Thanks
Chris
 
dunno if this is a good judge of the conn but steam reached 47.1 max and avg around 38
 
Your line attenuation is rather high, which could cause problems when you try to get like a 4Mbps or faster ADSL connection.

Some people are fortunate enough to have stable 4-6Mbps ADSL connections with such high signal loss (aka high line attenuation) on their ADSL lines, where as others aren't.

Your ADSL line conditions are good enough for a 1Mbps down/512kbps up ADSL connection.

42kB/s would be roughly the maximum sustained download speed that you'll get on a 384kbps ADSL connection like you currently have.
 
Downstream rate: 9808 kbps
Upstream rate: 1023 kbps
PPPoE pass-through: Enabled
ADSL Line

Status: Cable connected
Line mode: ADSL2+
Maximum line rate: 9808 kbps (upstream)
Noise margin: 6.1 dB (upstream)
Line attenuation: 41.4 dB (upstream)
Output power: 17.7 dBm (upstream)

Could someone give feedback on noise margin, line attenuation and output power given that this is a 10mb line.
 
Juiliass_M:
Those values does not seem like upstream values.

If those values were downstream values, I would suggest that you at least downgrade to 8Mbps to get your downstream noise margin up.
 
@Pada

Isn't attenuation the distance from exchange?

Are those the telkom boxes on the side of the road exchanges?
If they are I think live about 100m away from one.

Anyway to improve the value?

Thanks for the help
Chris
 
Yes, the attenuation is primarily related to the length of the ADSL line.
Corroded connectors could increase the value too.

Telkom Exchanges are buildings if I'm not mistaken, but the mini-DSLAM could fit in a box. The ADSL lines terminate in a DSLAM.

If you're 100m away from the DSLAM, it still does not imply that your ADSL line's length would be ~100m. It could be that your ADSL line is connected to a different DSLAM.
 
Thinking of upgrading to 1Mbps and maybe 4Mbps later on, would this line handle it:

Down / Up

SNR Margin 40.4 / 31.0 dB
Line Attenuation 22.6 / 9.0 dB

Thanks
 
@Toilet_Duck:
Those stats are good enough for 10Mbps easily, if the Exchange+DSLAM supports it of course...
 
I just copy pasted values in router, I also presume that they were downstream values.
 
@Juliass_M:
Could you perhaps take a screenshot of your ADSL modem's stats? You can then upload the image to like www.imagehost.co.za and post a link to it here. Imagehost will provide you with the BBcode that would make linking of the image on this forum much easier.
 
@Julias_M

Your attenuation of 40 implies you are not exactly close to the exchange, with a 10Mbps downstream line your SNR will drop significantly. I have experienced constant connection drops when the SNR is around 6-8 (below 6 is too low for a stable connection). If you dont experience any drops then you dont really need to care, but otherwise you could call telscum up and drop your line speed too 8 or 9. Your SNR should pop above 12 which is decent for a stable line. (I am sad, i can only get a stable 3Mbps where my SNR is 12 :( )
 
Hi guys,

What could be causing the high download line attenuation, having adsl issues at the moment, usually sync at 6mb but they now say our line is screwed. And theoretically shouldn't the download be better than the upload, not in this case!! Please take note that these stats are a week old and line attenuation has dropped to 60 dB for dwnld and speed is now 3200 Kbps

*

Stats
--- System Information ---
Vendor: Linksys
ModelName: WAG320N
Firmware Version: 1.00.12 , 2010-03-22T10:51:43
Boot Version: 1.06
Hardware Version: 0.01

--- DSL Information ---
DSL Driver Version: AnnexA version - A2pB023k.d21d
DSL VPI/VCI: 8/35
DSL Status: Showtime
DSL Mode: G.DMT
DSL Channel:*
DSL Upstream Rate: 512 Kbps
DSL Downstream Rate: 2848 Kbps

Down up*
DSL Noise Margin: 6.1 dB 11.0 dB
DSL Attenuation: 62.0 dB 31.5 dB
DSL Transmit Power: 18.1 dBm 12.3 dBm
 
Thanks for feedback... I will phone them up and drop it to 8 mb/s, I anyway don't have plans on buying a 10mb account @ current prices.
 
Hi Guys ive been struggling with my work's ADSL for 2 months now.. Telkom keeps promising to remedy the situation but nothing ever changes. Check these stats out and let me know what you guys think...

 
Wolfy:
Your modem should actually say that it is measuring the SNR Margin & Attenuation in 0.1dB units, which means that your SNR margins are 7.5dB down / 7.0 dB up and your Attenuation is 63.5dB down / 31.5 dB up.

Unfortunately for you, your line attenuation (signal loss mainly due to distance to DSLAM) is very high, which would make anything above 512kbps ADSL connectivity very unstable.

I would suggest that you try and find out with Telkom how far you are from the DSLAM/Exchange, because from those stats it seems like you're VERY VERY far - too far for a stable 1Mbps connection at least.

If you know that the line attenuation values was better than that previously, then you should be able to get Telkom in to get it fixed. If not, then your only hope is either to downgrade to 512kbps ADSL (which now costs the same as 1Mbps ADSL) OR to move to another location closer to the DSLAM OR to wait till Telkom installs a new DSLAM closer to you.

Lastly: don't make double posts in different/multiple threads!
 
sorry for the multiple post the other thread hasnt been replied in in years so I searched one that was more recent. As for the distance Telkom claims im 10KM from my exchange and what makes it even worse is, every 512kb line gets upgraded to 1mb anyways so its a lose lose situation.
 
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