How do you improve SNR Margin?

ajules said:
Your upstream attenuation does not look right.It should be around 50% of your downstream attenuation
Either something wrong with your line or router
Click to expand...


Connection Speed 4096 kbps 512 kbps
Line Attenuation 5.5 db 5.0 db
Noise Margin 26.4 db 27.0 db

Not true my attenuations are also close to each other for Up and down
 
Keegan said:
Hi,

Found where your exchange should be,
http://www.broadbandstats.co.za/exchange/WBTG04

are you far from there?

Below is your line interrogation, Doesn't look very pretty... could be your electric fence or distance from exchange.
If you are close to the exchange and turning off your electric fence does not change the SNR then you should log a fault with Telkom: slow/intermittent connectivity.

View attachment 33054
Click to expand...

Hi Keegan

I'm quite far from the Bothasig exchange, but my DSL terminated quite a bit closer. I spoke to the telkom network planner recently. My line terminates at the DSLAM/MSAN they built in Burgundy Estate about 6 months ago. I'm about 1km from DSLAM.

OK, I did some tests:
1. Connected a D-LINK G604T dsl router I borrowed from work. The line stats were more or less the same. Same SNR. BUT, the D-link synced my upstream at 10014 kbps (slightly higher than the billion)

2. Connected a Netgear DG834 dsl router I borrowed from a friend. The line stats were still more or the less the same. SNR margin slightly less, and also synced at 970 kbps upstream.

3. Switched off the electric fence, unplugged the line and reconnected it to the Billion 7300GRA to force a resync. Line stats are still the same. SNR upstream is 5.9dB now.

4. Had telkom perform a port recreate, and I did a port reset myself using WebAfrica's control panel.

So far nothing I have tried indicated a problem on my side. To problem appears to be somewhere on Telkom's side? I'm going to log a line fault and see where that takes me. I really can't think that with that little attenuation that the SNR can be that high???
 
I still think you may need to just drop your line to 8mbit/sec, getting telkom to look for a line fault is like stabbing in the dark and hope you hit something.

Either way, to give you another example, using my line.
1. This used to be worse, but had Telkom install a brand new line, in fact they had to install it all the way from the closest jump box to my house, so went to all the houses down the road to link it up.
2. This install was done whilst my previous line was up, to ensure it is a brand new line, so the tell# ect changed.

Stats:
------------------------
DSP Firmware Version DMT FwVer: 3.10.17.0_A_TC, HwVer:T14F7_5.0
DMT Status Up
Operational Mode ADSL2+
Upstream 1003 kbps
Downstream 10015 kbps
SNR Margin (Upstream) 7.0 db
SNR Margin (Downstream) 10.1 db
Line Attenuation (Upstream) 14.4 db
Line Attenuation (Downstream) 27.0 db

So you see, my SNR is better, BUT my Attenuation is also better than yours.
Downstream: 27db attenuation instead of 29db
Upstream: 14.4db instead of your 31.8db (see massive difference in attenuation)

So either something on your line is screwing you around, like alarm, faulty filters, bad tellephone, fax machine or something, and that is probably causing your upstream SNR to suffer.
 
Tinuva said:
I still think you may need to just drop your line to 8mbit/sec, getting telkom to look for a line fault is like stabbing in the dark and hope you hit something.

Either way, to give you another example, using my line.
1. This used to be worse, but had Telkom install a brand new line, in fact they had to install it all the way from the closest jump box to my house, so went to all the houses down the road to link it up.
2. This install was done whilst my previous line was up, to ensure it is a brand new line, so the tell# ect changed.

Stats:
------------------------
DSP Firmware Version DMT FwVer: 3.10.17.0_A_TC, HwVer:T14F7_5.0
DMT Status Up
Operational Mode ADSL2+
Upstream 1003 kbps
Downstream 10015 kbps
SNR Margin (Upstream) 7.0 db
SNR Margin (Downstream) 10.1 db
Line Attenuation (Upstream) 14.4 db
Line Attenuation (Downstream) 27.0 db

So you see, my SNR is better, BUT my Attenuation is also better than yours.
Downstream: 27db attenuation instead of 29db
Upstream: 14.4db instead of your 31.8db (see massive difference in attenuation)

So either something on your line is screwing you around, like alarm, faulty filters, bad tellephone, fax machine or something, and that is probably causing your upstream SNR to suffer.
Click to expand...

I have nothing else connected to the line. Just the DSL router. I replaced the entire telephone cable inside the house with twisted pair.
 
Last edited:
Call telkom and ask them to do a lts line test for you and see if they pick up any anomalies.
 
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