SNR Tweaks

feriso · 6 Nov 2006 at 09:04

Just got myself a Speedtouch 585v6 and d/l DMT Tool - all very good but I've not a clue about where to start in terms of trying to improve my connection speed.

My line stats are given below if that helps...

Uptime: 4 days, 8:14:47
Modulation: G.992.1 Annex A
Bandwidth (Up/Down) [kbps/kbps]: 448 / 2,528
Data Transferred (Sent/Received) [MB/MB]: 18.93 / 92.47
Output Power (Up/Down) [dBm]: 12.0 / 18.0
Line Attenuation (Up/Down) [dB]: 29.5 / 51.0
SN Margin (Up/Down) [dB]: 20.0 / 9.5
Vendor ID (Local/Remote): TMMB / µ
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 72 / 0
FEC Errors (Up/Down): 486 / 205,982
CRC Errors (Up/Down): 154 / 117
HEC Errors (Up/Down): 100 / 106

Any help would be much appreciated

Locky · 6 Nov 2006 at 10:47

log into your router using the DMT tool

ip-add is 10.0.0.138

port 23

your username / pw for your router

then click modemoptions Tab

then you see loads of little boxes under modem options

check modify

then the top box 00=60

apply and resync

and go from there

test stability and keep an eye on them crc erros

feriso · 6 Nov 2006 at 11:11

OK, figured that out but what is a good sort of figure to aim for in terms of CRC errors, speed etc based on my line stats as I have no idea really what to expect.

So does reducing the SNR improve line speed?

A[L]C · 6 Nov 2006 at 11:25

feriso said:
OK, figured that out but what is a good sort of figure to aim for in terms of CRC errors, speed etc based on my line stats as I have no idea really what to expect.

So does reducing the SNR improve line speed?

in short yes. But remember the lower the snr the more likely you are to have disconnects

edit: your snr is currently 9.5... you can drop that down to about 6 and you shouldnt have any problems

Locky · 6 Nov 2006 at 11:39

yeah try 6db and go from there

imo you wont get much lower.

but if you needed to go that 1db lower to reach the next BRAS profile

then try it

limits can be found here

http://www.adslguide.org.uk/newsarchive.asp?item=2622

gord · 6 Nov 2006 at 11:52

This is interesting does the same information apply to ADSL2+?

Im on bulldogs 16 meg service, so ADSL2+, but were getting 2Meg performance. Now im not too sure on our run in period, but were synced at about 15000. Should we contact bulldog and ask them why were getting these speeds.

feriso · 6 Nov 2006 at 18:49

TiZoR said:
log into your router using the DMT tool

ip-add is 10.0.0.138

port 23

your username / pw for your router

then click modemoptions Tab

then you see loads of little boxes under modem options

check modify

then the top box 00=60

apply and resync

and go from there

test stability and keep an eye on them crc erros

Done what you said and it resyncs with the same snr - 9.5dB :eek:

What am i doing wrong? :confused:

AdWright · 6 Nov 2006 at 21:25

feriso said:
Done what you said and it resyncs with the same snr - 9.5dB

What am i doing wrong?

You also need to uncheck the 'default SNRM' box before adjusting the SNR.

feriso · 6 Nov 2006 at 22:42

AdWright said:
You also need to uncheck the 'default SNRM' box before adjusting the SNR.

Being really thick now - can't see it......

feriso · 6 Nov 2006 at 22:46

Found it but it is shaded out (and unchecked) when I select the modify button

AdWright · 6 Nov 2006 at 23:13

Hmm, I'm stumped then as I've expended all my knowledge of the DMT tool. The option is selectable on my Speedtouch 780. Maybe it doesn't work with your model?

feriso · 6 Nov 2006 at 23:43

Hmm played about with it and I need to set modemoptions to 30 not 60 to get 6dB SNR - synced at 3.2Mbs so juts doing some logging to see what happens...