SNR and Line Attenuation

I'm on a 4MB line and my modem shows the following:

Local Line Atten.: 43.0 dB
Remote Line Atten.: 25.0 dB
Local SNR Margin: 12.0 dB
Remote SNR Margin: 12.0 dB

Which is the downstream and upstream?

I also see a table with the following info:

Counters Local
Fast
CRC: 18067

Failures Local
SEF: 6292

LOS: 6105

LCD: 6197

Can anyone tell me if this is good or bad? Reason I'm asking is because I get terrible lag in World of Warcraft and even worse lag spikes.

that figure worries me - it tells me you have had 6105 complete failures of the adsl signal to the exchange - be it lightning , powerfailure , signal failure , weak lines , copper problem whatever..

how long has that router been switched on for?
 
Bit of a software update and I'm getting this:

Downstream

Upstream

SNR Margin 25.4 13.0 dB
Line Attenuation 54.0 31.5 dB
Errored Seconds 2324 17091
Loss of Signal 1 1
Loss of Frame 0 0
CRC Errors 0 0
Data Rate 384 128 kbps
Latency FAST FAST

And no more damn errors! :D
 
[OUPA]MrNutz;1373850 said:
that figure worries me - it tells me you have had 6105 complete failures of the adsl signal to the exchange - be it lightning , powerfailure , signal failure , weak lines , copper problem whatever..

how long has that router been switched on for?
About 2 weeks I would say. So I take it, its very bad?
 
monitor that LOS counter - as soon as you pick up the telephone and put it down - your counter should increase by 1.

that would indicate abscence of filter or broken filter
 
Random dc

Hi guys,

Here is my line parameters. I'm having big problems with random dc's and have logged numerous calls with hellkom.

Noise margin upstream : 24db
Noise margin downstream : 43.5db
Attenuation upstream : 8.5db
Attenuation downstream : 22db

Regards
 
1)what data rates are you synced at
2)can you monitor this at random intervals
3)use program called routerstats
 
Those are very strong figures, debug.

As [OUPA]MrNutz says, you need to use a program that can monitor those figures over a long period. For instance, Routerstats will poll for those figures every few minutes (I can't remember the interval) and graph what it reads so you can take a look at min, max and average.

What router are you using? And what exactly do you mean by random disconnects? Do you have to log into your router and force it to reconnect, or what? Maybe it has an idle timer and is disconnecting when you are idle for a certain period...?
 
To add a few cents here:

I've got a Billion Bipac 5102 as well as a Netgear DG834GT router, and the Netgear gets a faster sync speed (4096 vs 2500 - 3200 on the Billion)

I basically never sync at full spead on the Billion...

My current line stats on the Netgear:

ADSL Link Downstream
Connection Speed:384 kbps
Line Attenuation:31.5 db
Noise Margin:13.0 db

ADSL Link Upstream
Connection Speed: 384 kbps
Line Attenuation: 31.5 db
Noise Margin: 13.0 db

:eek:
 
LOL @ ///MoH's observation of spacebar's SDSL (not ADSL) line ;)

Seems like I'll have to start reading these forums a bit earlier at night, and make peace with Firefox not copying & pasting tables as tables... :o

Well spotted there ///MoH !!!

Here again (not re-modelled)

ADSL Link Downstream Upstream
Connection Speed 4096 kbps 384 kbps
Line Attenuation 58.0 db 31.5 db
Noise Margin 8.3 db 13.0 db
 
Worrying figures, spacebar. Do you use Routerstats to see if they fluctuate at all?

No, I just noticed things were going a bit slower on the Billion than the Netgear after upgrading the line. So I just go check the router manually once in a while
 
Guys, not to hijack the thread or anything, but can you also look at my SNR and Att values on my 384k line please:

SNR Margin:
Downstream 40.1db
Upstream 13.0db

Line Attenuation:
Downstream 28.1 db
Upstream 15.5 db

Those upstream values bother me. I never ever get any line disconnects, no CRC errors, although logging into my router I see I have 2 CRC errors underneath my upstream column for the 1st time ever, but other than that no CRC errors ever occur. What irritates me the most, 4 of my friends in Bloem that also has 384k like me, all have a ingame ping of 29ms to 40ms, where my ping starts at 55 and goes till 79.

It bothers me so much, that sometimes ingame I'll get peeved off because of my high ping. All of them are on a (051) 522 xxxx number, although my brother has a (051) 436 xxxx number, in turn I have a (051) 446 xxxx number. Do you guys think it could be routing of certain numbers via certain routes to get them better pings ?

Or could it be because my exchange maybe overloaded and is in a dire need of a upgrade ??

Or could it be because of the routing of my connection via another place in sa, to give me a +20ms extra ping than that of my friends.

I do have a number of a guy at IPnet, maybe I should give him a call and find out the truth about the routing of their connections, vs mine.
 
Last edited:
I can't comment on the whole latency and routing issue, but I have noticed that people's upstream noise margins are a LOT lower than their downstream margins (myself included). Your figures seem okay to me (when compared to what others have been posting).

Can you get your friends' line stats to compare if they have better upstream SNR and attenuation figures?
 
Another thing that bothers me, is that whenever I try to perform a tracert to tpr-route-server.saix.net, I get the following when I use my SAIX account:

Tracing route to tpr-route-server.saix.net [196.25.9.46]
over a maximum of 30 hops:

1 * * * Request timed out.
2 * * * Request timed out.
3 * * * Request timed out.
4 53 ms 52 ms 51 ms tpr-route-server.saix.net [196.25.9.46]

Trace complete.

And when I use my IS account, I get the following:

Tracing route to tpr-route-server.saix.net [196.25.9.46]
over a maximum of 30 hops:

1 * * * Request timed out.
2 53 ms 52 ms 52 ms cdsl1-rba-gi1-1-453.ip.isnet.net [196.38.73.169]

3 55 ms 54 ms 54 ms 196.38.73.142
4 51 ms 52 ms 52 ms cdsl1-rba-gi0-3-52.ip.isnet.net [196.38.73.137]

5 52 ms 52 ms 52 ms core2a-rba-gi0-1.ip.isnet.net [196.26.0.8]
6 52 ms 52 ms 53 ms cp3-rba-gi0-1.ip.isnet.net [196.26.0.250]
7 52 ms 51 ms 54 ms cp1-rba-gi0-1.ip.isnet.net [168.209.86.166]
8 53 ms 53 ms 51 ms rrba-ip-spe-2-wan.telkom-ipnet.co.za [196.25.127
.181]
9 54 ms 54 ms 55 ms 196.43.25.137
10 56 ms 55 ms 52 ms tpr-ip-esr-1-ge-6-0-0.telkom-ipnet.co.za [196.43
.10.86]
11 55 ms 56 ms 55 ms tpr-route-server.saix.net [196.25.9.46]

Trace complete.

Where I get in the 50ms range with a tracert test, they all get in the 20ms RANGE !! :mad: This irritates me SOOOOO much I can scream ! :mad: and whats intresting is that we all have the same SAIX ISP.

It doesnt matter which local site or international site I do a tracert test to, IT NEVER shows the route info like it does with my IS account. My other friends all only have a SAIX account and it displays their route info correctly, why does mine show Request timeout each time ?

BTW, I am using Vista Ultimate 32-bit, but it was the same when I had XP as well.

Any thoughts ??

:confused:
 
Last edited:
I hate to break it to ya...

_____________

Tracing route to tpr-route-server.saix.net [196.25.9.46]
over a maximum of 30 hops:

1 15 ms 15 ms 20 ms tpr-route-server.saix.net [196.25.9.46]

Trace complete.

_____________


I'm using a SAIX account (prepaid shaped, via Web Africa).

Just a shot in the dark, but can you do an ipconfig /all and paste the results here?
 
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