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Expected sync speed, noise and DL/UL rates

Posted: Fri Aug 12, 2016 11:26 am
by halibut
Hi,

Member on ADSL2+ plan for a few years now, never had a need for a good upload rate, but that time has now come.

I want to get as much as I can and I have played around with my router configuration and cabling/filters to get the best possible outcome.

I live 2.4km from the Undercliffe exchange. These are the reported stats from my TP LINK Archer D7 router:

Upstream Downstream
Current Rate(kbps) 710 6180
Max Rate(kbps) 820 6444
SNR Margin(dB) 13.3 12
Line Attenuation(dB) 23 44

Using speedtest.net
Ping 30ms
Down 5.15Mbps
Up 0.6Mbps


I have tried with three different routers,
Tplink Archer D7 (2015)
Billion (old)
Netgear (old)

I get the best performance on the old Billion router,
Ping 29ms
Down 5.42Mbps
Up 0.73Mbps


So I want to ask, is my sync rate expected for the distance to the exchange?

Are the SNR, attenuation numbers normal, or noisy? (I don't have a clear reference for understanding this)

Finally, is there anything I can do to get more upload, even if that means sacrificing download.

I have already referred to the very helpful post: Fixing Slow/Variable Speeds https://forum.exetel.com.au/viewtopic.php?f=284&t=12014

I plan to get NBN when it is available in my area.

Re: Expected sync speed, noise and DL/UL rates

Posted: Fri Aug 12, 2016 1:04 pm
by Dazzled
A line test by Exetel support will indicate if that is at an optimum state.

Assuming that, the noise margin chosen will affect the upload rate. Each modem tests the line and then in conjunction with the exchange sets the transmission speed. Your results reflect differences in the modem software, starting with the noise margin selection. The lower the margin, the faster it goes, but with a much higher risk of noise drop-outs. Did you note the different margins?

Some Billions have a browser interface setting to lower the default margin (aka coding gain). For most modems you will need terminal commands on the telnet interface. I gave the method for fiddling with Broadcom chipsets at https://forum.exetel.com.au/viewtopic.p ... 49#p309013

Don't expect miracles though. In ADSL upstream is intended to be slower.

Re: Expected sync speed, noise and DL/UL rates

Posted: Fri Aug 12, 2016 1:56 pm
by KavindaS
halibut wrote:Hi,

Member on ADSL2+ plan for a few years now, never had a need for a good upload rate, but that time has now come.

I want to get as much as I can and I have played around with my router configuration and cabling/filters to get the best possible outcome.

I live 2.4km from the Undercliffe exchange. These are the reported stats from my TP LINK Archer D7 router:

Upstream Downstream
Current Rate(kbps) 710 6180
Max Rate(kbps) 820 6444
SNR Margin(dB) 13.3 12
Line Attenuation(dB) 23 44

Using speedtest.net
Ping 30ms
Down 5.15Mbps
Up 0.6Mbps


I have tried with three different routers,
Tplink Archer D7 (2015)
Billion (old)
Netgear (old)

I get the best performance on the old Billion router,
Ping 29ms
Down 5.42Mbps
Up 0.73Mbps


So I want to ask, is my sync rate expected for the distance to the exchange?

Are the SNR, attenuation numbers normal, or noisy? (I don't have a clear reference for understanding this)

Finally, is there anything I can do to get more upload, even if that means sacrificing download.

I have already referred to the very helpful post: Fixing Slow/Variable Speeds https://forum.exetel.com.au/viewtopic.php?f=284&t=12014

I plan to get NBN when it is available in my area.
Mean time let me have you service number to check the line specs. You may PM the service number to me.

Re: Expected sync speed, noise and DL/UL rates

Posted: Fri Aug 12, 2016 5:28 pm
by halibut
Hi Dazzled,
Dazzled wrote:A line test by Exetel support will indicate if that is at an optimum state.

Assuming that, the noise margin chosen will affect the upload rate. Each modem tests the line and then in conjunction with the exchange sets the transmission speed. Your results reflect differences in the modem software, starting with the noise margin selection. The lower the margin, the faster it goes, but with a much higher risk of noise drop-outs. Did you note the different margins?
Thank you, I do see this now. From what I have read about SNR margin, it is a number obtained after subtracting line speed - sync speed. But does this actually tell me if it is a noisy line or something is wrong with the phone socket?
e.g. for SNR margin 12db: it could be 13db - 1db or 43db - 31db. I don't claim to understand these things and I probably come across as clueless (probably am).
Dazzled wrote: Some Billions have a browser interface setting to lower the default margin (aka coding gain). For most modems you will need terminal commands on the telnet interface. I gave the method for fiddling with Broadcom chipsets at https://forum.exetel.com.au/viewtopic.p ... 49#p309013
Yes, this billion does have coding gain that is set as Auto. I had not been using this billion router as I do worry about security and stability, it is literally 10 years old and I have to manually reboot 1-2 times a month. I will see about the line test and revisit that setup.
Dazzled wrote: Don't expect miracles though. In ADSL upstream is intended to be slower.
I am ok with that.

cheers