ASUS DSL-N14U router affecting SNR

[ct_boy]

I have a 10Mbps line (uncapped), its was syncing at 7Mpbs and with this router (Asus DSL-N14U) the SNR was 11-12dB. However when ISP technicians were here testing with their router (and telephone line and all lan cables connected - so like for like) we saw the SNR was 15-16dB.

At the moment, the line is syncing at 8Mbps and the SNR (on the ASUS) is 6dB. The SNR improves as you reduce the sync speed on the line. The higher the sync speed, the worse the SNR.

The question is, why would this router (1 year old) be effecting my SNR? Are there other settings I can play with on this router?

Below is a screenshot of the current SNR & Line attenuation:
http://imgur.com/a/UsRAt

Will any of these setting have any effect?
http://imgur.com/a/eb8lp

thanks in advance

 

[pete y testing]

The SNR improves as you reduce the sync speed on the line. The higher the sync speed, the worse the SNR.

your a little confused here

snr is a measurement of the signal to noise ratio , the isp will set a target snr of 6 db usually as this is the balance between speed and stability , the snr does change throughout the day due to many factors but shouldnt change a huge amount

since you have a 10Mbps line which is speed limited you really shouldnt have any issues and your max rate is just about spot on for the isp limited speed plan

Will any of these setting have any effect?

to no great extent and you will prob just start causing stability issues

just be happy with the speed you have if its stable and error free

the dsl-n14u is a pretty old modem and uses a ralink modem chipset that not known to be great

might be time to upgrade is you want to chase speed to something with a broadcom modem chipset in it

 

[ct_boy]

your a little confused here

snr is a measurement of the signal to noise ratio , the isp will set a target snr of 6 db usually as this is the balance between speed and stability , the snr does change throughout the day due to many factors but shouldnt change a huge amount

I just find it odd that if they change the sync speed on my line, the SNR changes too. And im not talking 1 or 2 db its about 6db per 1mb they increase or decrease the line sync speed.

I'm happy with my speed but not the SNR. I see it effecting my streaming of movies. I believe the SNR should be above 11db. Also the modem isn't old and thought it was generally very good? And when i see a different modem used by a technician that is giving a better SNR I obviously want to improve my line and modem.

thanks

 

[pete y testing]

yes if the isp changes the target snr this will directly effect the attainable or max rate , the higher the srn the slower the speed would be , but 6db is the normal target snr most isp's set , some set the snr target to 12 db to increase stability but at the cost of speed

I believe the SNR should be above 11db.

so your understanding of this is incorrect

the snr its self wont effect streaming unless the snr lowers the speed to a point the incoming stream has to buffer

you may want to do some googling on target snr and speeds

i will point out that your isp is artificially speed limiting your adsl connection and this reflects in the snr rates seen by the modem

by your attenuation your line is fully capable of the max adsl speeds of 20M down , the isp is limiting it to 10M

 

[sfx2000]

your a little confused here

He's talking about the WAN side (xDSL) - higher bit rates will be more sensitive to noise...

 

[pete y testing]

He's talking about the WAN side (xDSL) -

yes exactly , the target snr of 6db is what most isp's use , some use 12 db usually because their systems are crap and forcing the snr to 12 db increases stability but at the cost of speed / max sync rate

the isp doesnt randomly move the snr about , the snr however will move slightly throughout the day

some isp have DLM which forces noisy lines onto a lower speed to ensure stability

The SNR improves as you reduce the sync speed on the line.

his logic is backwards

if you increase the snr the sync speed will decrease as a result and if you lower the snr the speed will increase

 

[ct_boy]

hi all,

I'm no expert and really appreciate your feedback.
by looking at sites like this: http://www.dslreports.com/faq/16220 it suggests my SNR should be higher than 11 (which it isn't right now). And whenever I ask the ISP to increase my download speed (ie: my sync speed, and as I'm on a 10Mbps line but only getting 6Mbps due to the sync speed being set at 7mbps) the SNR down always lowers to about 6dB and when sync spped drops (so now my download speed drops), the SNR is much much better. i dont know if they were adjusting the SNR to adjust the sync speed as @pete_y_testing was saying above.

i just find it odd that one router will show one reading and just a few moments later the other shows something VERY different in terms of SNR (line speed, sync speed & line attenuation was no different).

When i say my ine is bad for streaming when SNR is low, I mean I have packet loss.

thanks all