Whirlpool

I just recently joined the TPG N/W and have had some initial problems. I have a very low SNR margin. With my previous ISP it was quite high (in the 20's) with TPG it is usually 6 dB down and 9 dB up. I am using a DSL G604T Dlink with the latest V2.00B05.AU_20060711 firmware. I also have been having some dropping of sync issues.

Any suggestions? I have already emailed TPG.

edit: its ADSL2+

OK changed from multimode to d.gmt and got similar SNR but thats not exactly a solution but a trade off for reliabilty over speed.

stenretni writes...

OK changed from multimode to d.gmt and got similar SNR but thats not exactly a solution but a trade off for reliabilty over speed.

TPG apparentely recommends G.DMT as a standard even with ADSL2+ otherwise you'll continue to have problems as such...

So how does that allow for up to 24Mb down? Seems to have gotten worse since my ADSL was officially connected and TPG updated my status

Wait for Telstra to activate service (seemed ok)
ADSL has been installed
Changed ADSL parameters (erratic since this)

Yeah I had a lot of drop out issues and they apparentely can change your ADSL Profile which you're setup with, things went ok but I was capped to 4mbit so I rang them up again they changed the ADSL Profile which since then the drop outs continued but I synced higher then 4mbit's ........... It's a bit more stable now though.

Give them a call about it they've got the necessary tools to test everything from there end, unless there's a fault which Telstra has to fix on your line.

Damn, thanks for the advice.

stenretni writes...

I have a very low SNR margin. With my previous ISP it was quite high (in the 20's)

With your previous isp you were on adsl1 i take it, which in the 20's is normal

with TPG it is usually 6 dB down and 9 dB up

And that is normal for adsl2+

have a look here index.cfm?a=wiki&tag=DSLAM_speeds

stenretni writes...

I also have been having some dropping of sync issues.

Adsl 2+ is more sensitive to the enviroment your in, things such as long extension cords, thermostats around the home etc can affect it

Another common cause is the filter, a central spliter is the best way

Only problem is is that it fluctuates to as low as 2 and becomes quite flaky. I'll look into it more tomorrow. Thanks.

stenretni writes...

Only problem is is that it fluctuates to as low as 2 and becomes quite flaky. I'll look into it more tomorrow. Thanks.

The lower the snr the better

Stoneyyy writes...

The lower the snr the better

I thought the higher the SNR but the lower the attenuation was desirable?

ie. the more signal to noise the better

meaning the lower the number

stenretni writes...

ie. the more signal to noise the better

You are right Stoneyy is wrong (you get used to this):

www.kitz.co.uk/adsl/lowSNR.htm

Slammin writes...

You are right Stoneyy is wrong (you get used to this):

www.kitz.co.uk/adsl/lowSNR.htm

That page refers to ADSL 1 Not ADSL 2+

ADSL2+ is best between 6 and 12db

index.cfm?a=wiki&tag=DSLAM_speeds

stenretni writes...

the more signal to noise the better

During negotiation the modem will look at the s/n.
If it is high it will increase speed.
Increased speed = increased attenuation.
Increased attenuation = lower s/n.
When the s/n gets down to 6~12 negotiation is complete.

I am sure this is an over simplification but shows the basic reason why a good ADSL2 connection has a s/n of 6~12.