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Author Topic: How am i getting this?  (Read 8436 times)

Ronski

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Re: How am i getting this?
« Reply #15 on: September 08, 2015, 11:15:54 PM »

And I'm only 450 meters and only getting 45 Mbps  :(
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NewtronStar

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Re: How am i getting this?
« Reply #16 on: September 08, 2015, 11:29:52 PM »

And I'm only 450 meters and only getting 45 Mbps  :(

Indeed Ronski no two line are the same given an equal line length it must be down to conductivity crosstalk and other stuff that makes are lines so unique.
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jonnyt44

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Re: How am i getting this?
« Reply #17 on: September 09, 2015, 12:18:33 AM »

I think I'm quite possibly literally the only one using VDSL2 in the bundle, as Openreach ran a new bundle to our new development (in a new PVC duct) from the PCP (with the fttc cab next to it), where myself and next door are the only houses completed (and next door don't have fttc).

Since this is a development with nearly 50 houses being built, I think that I will see a drop over time :(

Regarding the attenuation figure everyone is talking about...is it the 16dB or the 20dB? Which is the important one?

Thanks
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Chrysalis

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Re: How am i getting this?
« Reply #18 on: September 09, 2015, 12:24:40 AM »

Ronski put in for a pair swap, I would :)
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burakkucat

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Re: How am i getting this?
« Reply #19 on: September 09, 2015, 12:39:25 AM »

Regarding the attenuation figure everyone is talking about...is it the 16dB or the 20dB? Which is the important one?

Both are important! The smaller, the better.  ;)  Those two figures are upstream and downstream, respectively.

I like to regard the attenuation as the "electrical length" of the circuit as distinct from the physical length.

As an example, there are approximately 2400 metres (physical) between my modem/router and the (exchange located) MSAN. As a consequence my attenuation is 28 dB and 48 dB, respectively.
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NewtronStar

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Re: How am i getting this?
« Reply #20 on: September 09, 2015, 12:45:29 AM »

Regarding the attenuation figure everyone is talking about...is it the 16dB or the 20dB? Which is the important one?
Thanks

It does not matter jonnyt44 the attenuation on fttc is not a benchmark for distance to PCP cabinet it's only a very rough guide, we would go with the downstream attenuation as a start point.
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Ronski

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Re: How am i getting this?
« Reply #21 on: September 09, 2015, 06:14:35 AM »

Will joints and thickness of the copper affect attenuation?  Is it possible BT have seen sense and installed heavier gauge copper?
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roseway

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Re: How am i getting this?
« Reply #22 on: September 09, 2015, 07:01:29 AM »

Heavier gauge copper will probably have lower attenuation, but it's not a simple matter of lower DC resistance. At the frequencies we're talking about, skin effect is an important consideration (that's the effect whereby high frequencies tend to travel mainly in the outer skin of the conductor, not the core). I imagine heavier gauge copper will have lower attenuation because it has more skin.

There are many other high frequency effects which all contribute to the attenuation - inductance, capacitance, standing waves, etc. - so attenuation is never a simple matter to analyse.
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broadstairs

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Re: How am i getting this?
« Reply #23 on: September 09, 2015, 08:03:12 AM »

Out of interest I just checked my distance to the cab and it is around 255m and I am seeing 17db attn down with a max possible of 77878kbps and actual 64320 so there is a lot more to this than meets the eye. My cab was full last year and I had to wait for it to be expanded before I could go FTTC so there must be quite a lot of FTTC users on it.

Stuart
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Mark07

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Re: How am i getting this?
« Reply #24 on: September 09, 2015, 01:09:21 PM »

Pah I'm 700m from the cab (confirmed by OR engineer) and I get a very flaky 33/5 connection, that's the effect aluminium has I guess!
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Chrysalis

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Re: How am i getting this?
« Reply #25 on: September 09, 2015, 02:18:03 PM »

Will joints and thickness of the copper affect attenuation?  Is it possible BT have seen sense and installed heavier gauge copper?

yep thicker copper lowers attenuation.
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Weaver

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Re: How am i getting this?
« Reply #26 on: September 10, 2015, 09:14:53 AM »

I get the feeling that BT used thick good copper on my lines, which are something like five miles long. The thinking is that I wouldn't be getting the speeds I'm getting (DS sync rate of 2016-2144) without really good stuff being in use. That combined with a low noise level caused by the complete lack of humans and technology along the route once you get one mile away from the exchange.
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jonnyt44

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Re: How am i getting this?
« Reply #27 on: September 21, 2015, 08:43:04 PM »

Well...it's been nearly 2 weeks, and of course yesterday (or today), my sync has dropped. I think there was some digging on the BT ducts.

Code: [Select]
  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
   Running Mode            :      17A       State                : SHOWTIME
   DS Actual Rate          : 64343000 bps   US Actual Rate       : 19999000 bps
   DS Attainable Rate      : 64562400 bps   US Attainable Rate   : 25461000 bps
   DS Path Mode            :        Fast    US Path Mode         :        Fast
   DS Interleave Depth     :        1       US Interleave Depth  :        1
   NE Current Attenuation  :       16 dB    Cur SNR Margin       :        6  dB
   DS actual PSD           :     8. 0 dB    US actual PSD        :    13. 3  dB
   NE CRC Count            :     5756       FE CRC Count         :      577
   NE ES Count             :      870       FE  ES Count         :      508
   Xdsl Reset Times        :        0       Xdsl Link  Times     :        3
   ITU Version[0]          : b5004946       ITU Version[1]       : 544e0000
   VDSL Firmware Version   : 05-07-04-03-00-07   [with Vectoring support]
   Power Management Mode   : DSL_G997_PMS_L0
   Test Mode               : DISABLE
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :       20 dB    Far SNR Margin       :       15  dB
   CO ITU Version[0]       : b5004244       CO ITU Version[1]    : 434da459
   DSLAM CHIPSET VENDOR    : < BDCM >

Do you think there is a chance it will go back up? All the other stats look the same?? Anyone with better understanding of the stats like to chip in? :)

Just to compare, my initial stats were:

Code: [Select]
> adsl status
adsl status
  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
   Running Mode            :      17A       State                : SHOWTIME
   DS Actual Rate          : 79995000 bps   US Actual Rate       : 19999000 bps
   DS Attainable Rate      : 81794208 bps   US Attainable Rate   : 26933000 bps
   DS Path Mode            :        Fast    US Path Mode         :        Fast
   DS Interleave Depth     :        1       US Interleave Depth  :        1
   NE Current Attenuation  :       16 dB    Cur SNR Margin       :        6  dB
   DS actual PSD           :     7. 5 dB    US actual PSD        :    13. 4  dB
   NE CRC Count            :       12       FE CRC Count         :        1
   NE ES Count             :       10       FE  ES Count         :        1
   Xdsl Reset Times        :        0       Xdsl Link  Times     :        1
   ITU Version[0]          : b5004946       ITU Version[1]       : 544e0000
   VDSL Firmware Version   : 05-07-04-03-00-07   [with Vectoring support]
   Power Management Mode   : DSL_G997_PMS_L0
   Test Mode               : DISABLE
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :       20 dB    Far SNR Margin       :       15  dB
   CO ITU Version[0]       : b5004244       CO ITU Version[1]    : 434da459
   DSLAM CHIPSET VENDOR    : < BDCM >


Thanks
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jonnyt44

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Re: How am i getting this?
« Reply #28 on: September 21, 2015, 08:57:57 PM »

Annnnd after a sneaky reboot (via vigor 130 web admin), it's gone up again. Not to max though, but still better.

Code: [Select]
vdsl status
  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
   Running Mode            :      17A       State                : SHOWTIME
   DS Actual Rate          : 69680000 bps   US Actual Rate       : 19999000 bps
   DS Attainable Rate      : 69445296 bps   US Attainable Rate   : 25274000 bps
   DS Path Mode            :        Fast    US Path Mode         :        Fast
   DS Interleave Depth     :        1       US Interleave Depth  :        1
   NE Current Attenuation  :       16 dB    Cur SNR Margin       :        5  dB
   DS actual PSD           :     8. 0 dB    US actual PSD        :    13. 4  dB
   NE CRC Count            :        0       FE CRC Count         :      578
   NE ES Count             :        0       FE  ES Count         :      509
   Xdsl Reset Times        :        0       Xdsl Link  Times     :        1
   ITU Version[0]          : b5004946       ITU Version[1]       : 544e0000
   VDSL Firmware Version   : 05-07-04-03-00-07   [with Vectoring support]
   Power Management Mode   : DSL_G997_PMS_L0
   Test Mode               : DISABLE
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :       20 dB    Far SNR Margin       :       15  dB
   CO ITU Version[0]       : b5004244       CO ITU Version[1]    : 434da459
   DSLAM CHIPSET VENDOR    : < BDCM >
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