Topic: Target SNRM change is worth what sync rate increase? (Read 1678 times)

Weaver · « **on:** December 25, 2015, 08:04:34 AM »

I currently have an ADSL2+ line running with 67 dB downstream attn and it's set to a target SNRM of 6 dB currently. The downstream sync rate is 2784 kbps. The other two lines are a little slower: one is at 2450 kbps.

* If I change from 6 dB target SNRM to 3 dB, what increase in sync rate can I expect?

* Is there a calculator or a table for this anywhere?

I appreciate this may be a difficult question as necessary info may be missing.

sevenlayermuddle · « **Reply #1 on:** December 25, 2015, 10:31:07 AM »

I'm sure there is no rule set in concrete, but I'm sure you already know that.

One suggestion (by Kitz) that appears with the speed calculator page, is that each 3dB is worth 400-1200kbps. My own experience tallied with that, I got about 800kbps for each 3dB - shorter line though, just 56dB attenuation.

See words of wisdom, towards end of page...

http://www.kitz.co.uk/adsl/max_speed_calc.php

loonylion · « **Reply #2 on:** December 25, 2015, 11:25:35 AM »

I got an extra 2Mbps running my line at 1dB SNRM

it only dropped once a week

Weaver · « **Reply #3 on:** December 25, 2015, 11:29:50 AM »

Yes, I read that note. (Btw, I notice that the calculator gives up the ghost for >67 dB.)

Which way does it go in the 400 - 1200 range?

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Author Topic: Target SNRM change is worth what sync rate increase? (Read 1678 times)

Weaver

Target SNRM change is worth what sync rate increase?

sevenlayermuddle

Re: Target SNRM change is worth what sync rate increase?

loonylion

Re: Target SNRM change is worth what sync rate increase?

Weaver

Re: Target SNRM change is worth what sync rate increase?