Kitz ADSL Broadband Information
adsl spacer  
Support this site
Home Broadband ISPs Tech Routers Wiki Forum
 
     
   Compare ISP   Rate your ISP
   Glossary   Glossary
 
Please login or register.

Login with username, password and session length
Advanced search  

News:

Pages: 1 [2]

Author Topic: Max attenuation = 63.5 dB  (Read 6937 times)

Weaver

  • Senior Kitizen
  • ******
  • Posts: 11459
  • Retd s/w dev; A&A; 4x7km ADSL2 lines; Firebrick
Re: Max attenuation = 63.5 dB
« Reply #15 on: August 15, 2015, 04:37:54 PM »

That's what I read somewhere. Since I am more than 6 km from the DSLAM, that makes my ds attn an incredible 84 dB or even worse. Can't be possible, can it?
Logged

Weaver

  • Senior Kitizen
  • ******
  • Posts: 11459
  • Retd s/w dev; A&A; 4x7km ADSL2 lines; Firebrick
Re: Max attenuation = 63.5 dB
« Reply #16 on: August 15, 2015, 04:39:54 PM »

Perhaps BT originally put in superb thick copper for such long lines, so that voice would be ok?

Does that ever happen?
Logged

roseway

  • Administrator
  • Senior Kitizen
  • *
  • Posts: 43467
  • Penguins CAN fly
    • DSLstats
Re: Max attenuation = 63.5 dB
« Reply #17 on: August 15, 2015, 04:43:53 PM »

That's quite possible. I believe there was a mention of this on the forum fairly recently.
Logged
  Eric

lcl00

  • Member
  • **
  • Posts: 96
Re: Max attenuation = 63.5 dB
« Reply #18 on: August 15, 2015, 05:32:59 PM »

BT will use thicker cable for properties a long way from the cabinet.  About 800m of my D-side is 0.9mm copper and the last 500m or so is 0.6mm (I tried to push for 0.9mm, but they said it couldn't be run overhead).  However, the E-side was likely aluminium, which is why the figure was so woeful.  I think I read somewhere that BT tried to ensure that all of their network was no longer than the equivalent of 6.5km @ 0.5mm, but I could be pulling that out of my rear.

14dB/km must be for thinner and possibly more degraded lengths of copper, or maybe a very conservative average.  On my old routing I was 5.9-6.0km from the exchange and my attenuation on all 3 lines was between 56-57dB on ADSL1, which wouldn't correspond very well to those measurements.  Realistically once it hits that maximum of 63.5dB, it probably would be pretty difficult to estimate what the attenuation figure actually is.

Logged

Weaver

  • Senior Kitizen
  • ******
  • Posts: 11459
  • Retd s/w dev; A&A; 4x7km ADSL2 lines; Firebrick
Re: Max attenuation = 63.5 dB
« Reply #19 on: August 15, 2015, 05:48:25 PM »

The only real numbers I have are from back in the days when I was probably not using the higher bins on fixed 500k ADSL. And then I scored something like 61 dB ds attn. and nowadays, not quite reaching the 2272 ds sync rate threshold for 2 Mbps, it's gone off the end of the scale possibly only slightly for all I know. I have often hit 2272 but only have only held it for a few days to a week.
Logged
Pages: 1 [2]
 

anything