Print Page - Hmm, someone told me that 6db was the lowest n/m BT would allow

Title: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: klipp on Aug 25, 2010, 21:30:12

I'm currently 3db down and 5db up...

Or is it just adslmax which has the 6db lower limit?

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: BAP on Aug 26, 2010, 08:51:22

Quote from: klipp on Aug 25, 2010, 21:30:12
I'm currently 3db down and 5db up...

Or is it just adslmax which has the 6db lower limit?

Mine goes from 3db down and 8db up depending on the time of day. Just got a new Netgear dgnd3300v2 so I am monitoring my router :dunno:.
On 21CN

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: Steve on Aug 26, 2010, 08:55:46

I agree it's going to vary either way with noise but I think if I recall correctly we have seen a margin of 3db on ADSL2+ not sure whether it was Rik,Kinmel or both at one stage?

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: Glenn on Aug 26, 2010, 09:04:45

Rik was helping support the trial.

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: MisterW on Aug 26, 2010, 09:16:07

QuoteOr is it just adslmax which has the 6db lower limit?

Yep, on ADSL2+, if the MTBE is high enough at a 6db target then the DLM will try a 3db target.

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: Steve on Aug 26, 2010, 09:23:17

MTBE is that mean time between error?

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: Rik on Aug 26, 2010, 09:46:56

I think so, Steve.

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: sobranie on Aug 26, 2010, 10:00:37

I was a permanent 6db until some weeks ago. It then dropped to 3.6db with no loss of performance. Speeds in general have risen and I can fathom no reason why other than BT upping my profile to 18000 from 17000. Using dg834gV4 btw.

Test1 comprises of Best Effort Test: -provides background information.

Download Speed
20359 Kbps

0 Kbps 21000 Kbps
Max Achievable Speed

Download speedachieved during the test was - 20359 Kbps
For your connection, the acceptable range of speedsis 2000-21000 Kbps.
Additional Information:
Your DSL Connection Rate :20874 Kbps(DOWN-STREAM), 1187 Kbps(UP-STREAM)
IP Profile for your line is - 18000 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 20.27:22.25:57.48 (SBE:NBE:PBE)

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: Rik on Aug 26, 2010, 10:02:10

I see they haven't fixed the bug in the speedtester yet, Rick. ;)

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: Steve on Aug 26, 2010, 10:03:49

Along with a lot of other things they haven't fixed. :eyebrow:

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: Rik on Aug 26, 2010, 10:05:04

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: drummer on Aug 26, 2010, 19:27:50

At first, my ADSL2+ noise margin was 6dB but after the next reboot of the router, it dropped to 3.5 where it's remained ever since. Like sobranie, I also gained a higher sync, in my case 1000kbps.

Difficult to gauge how stable it is as Openreach are all over the place at the moment in preparation for FTTC later in the year but it's pretty stable.

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: MisterW on Aug 26, 2010, 20:10:02

QuoteMTBE is that mean time between error?

Certainly is. Sorry about the delay in confirming, got tied up today in the office and had to do some work instead
of lounging on the forum. ;D

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: BAP on Aug 27, 2010, 20:19:33

Quote from: klipp on Aug 25, 2010, 21:30:12
I'm currently 3db down and 5db up...

Or is it just adslmax which has the 6db lower limit?

A new low for me.
ADSL Link     Downstream     Upstream
Connection Speed    6655 kbps    1072 kbps
Line Attenuation    42.5 db      20.5 db
Noise Margin    2.3 db      4.2 db

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: Rik on Aug 28, 2010, 08:55:38

I know someone who can beat that. ;D

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: drummer on Aug 29, 2010, 00:33:52

I can beat that and I'll let you know when the router next loses sync or PPP.

Probably in the next five minutes, now that I've posted this.

Damn you BT, stop reading my posts! :D

[attachment deleted by admin]

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: zappaDPJ on Aug 29, 2010, 00:47:16

My word, I hope I get those kind of stats when I hook up to FTTC next week. You must live in the BT cabinet ;D

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: drummer on Aug 29, 2010, 15:32:05

Quote from: zappaDPJ on Aug 29, 2010, 00:47:16
My word, I hope I get those kind of stats when I hook up to FTTC next week. You must live in the BT cabinet ;D

We're not getting FTTC until December and my current stats allow me the luxury of holding fire until all the teething problems have been sorted out, courtesy of all you beta testers.

:tongue:

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: pctech on Aug 29, 2010, 16:04:58

I wish someone would write a line of code into the BT DLM that says in effect 'if not broken, leave well alone'

Title: Re: Hmm, someone told me that 6db was the lowest n/m BT would allow
Post by: Bill on Aug 29, 2010, 18:38:47

Assuming it's a subroutine, changing the first line to RETURN would improve it no end.

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Technical News & Discussion => Broadband, Internet & General Computer News & Discussion => Topic started by: klipp on Aug 25, 2010, 21:30:12