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Chrysalis
(eat-sleep-adslguide) Sun 03-Jun-12 02:13:57

how quick does the upstream rate drop on distance?

[link to this post]

Am I right that BT changed the profile so that the upstream now is weaker? so it drops of faster?

deleted
(deleted) Sun 03-Jun-12 09:02:50

Re: how quick does the upstream rate drop on distance?

[re: Chrysalis] [link to this post]

This link has a few graphs showing the difference between 8, 17 and 30 www.ictregulationtoolkit.org/en/document.2957.pdf

CJ8
(regular) Sun 03-Jun-12 17:23:10

Re: how quick does the upstream rate drop on distance?

[re: Chrysalis] [link to this post]

I get 11.5 upstream (and 31 down) at just under 1km from the cabinet.

deleted
(deleted) Sun 03-Jun-12 19:51:24

Re: how quick does the upstream rate drop on distance?

[re: CJ8] [link to this post]

In reply to a post by CJ8:
I get 11.5 upstream (and 31 down) at just under 1km from the cabinet.

Really?

I would love to see your pbParams data for comparison against mine.

I am also a little less than 1km from the cab & can only currently achieve 4Mb US throughput & 26.7Mb DS throughput.
At best, I have only ever achieved 5.5Mb US throughput.

Text

# xdslcmd info --pbParams 
xdslcmd: ADSL driver and PHY statusStatus: Showtime
Retrain Reason: 2Max:    Upstream rate = 4803 Kbps, Downstream rate = 33572 Kbps
Path:   0, Upstream rate = 4785 Kbps, Downstream rate = 28568 Kbps 
Discovery Phase (Initial) Band PlanUS: (0,95) (868,1207) (1972,2783) 
DS: (32,859) (1216,1963) (2792,3959) Medley Phase (Final) Band Plan
US: (0,95) (868,1207) DS: (32,859) (1216,1963) 
       VDSL Port Details       Upstream        DownstreamAttainable Net Data Rate:       4803 kbps         33572 kbps
Actual Aggregate Tx Power:        6.3 dBm          12.5 dBm============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3  Line Attenuation(dB):  8.4     55.1    80.9     N/A    21.9    64.8    0.1    
Signal Attenuation(dB):  9.6     54.4     N/A     N/A    21.9    64.8     N/A           SNR Margin(dB):  6.2     6.1      N/A     N/A    6.2     6.3      N/A   
         TX Power(dBm): -4.2     5.8      N/A     N/A    11.4    6.0      N/A

CJ8
(regular) Mon 04-Jun-12 11:47:19

Re: how quick does the upstream rate drop on distance?

[re: deleted] [link to this post]

Sorry, I don't have any parameters to share. I have an ECI modem connected to an ECI 128-line cabinet. The cable run is 100% underground from cabinet to house if that makes any difference.

deleted
(deleted) Mon 04-Jun-12 12:12:08

Re: how quick does the upstream rate drop on distance?

[re: CJ8] [link to this post]

Ah, that's a shame.

I was hoping to compare stats to see if I still have some sort of high resistance/attenuation problem.

Your upstream does look very good against only 31Mb downstream. What package are you on?

Mine is 40/10. I did trial 80/20 but it made no difference whatsoever.

orly
(knowledge is power) Mon 04-Jun-12 18:32:25

Re: how quick does the upstream rate drop on distance?

[re: deleted] [link to this post]

Your stats and line params aren't a million miles away from mine.

BT engineer out a month or two ago to replace a dead OR modem (one of the original batch that finally died after near 2 years) and he said the line was fine. Just life.

---
> Comparison chart of FTTC ISPs
> Got FTTC? Complete the survey

BT Infinity 8th July 2010
(NIBA)
600m (approx) to cabinet
Speedtest Tracking

deleted
(deleted) Mon 04-Jun-12 18:50:58

Re: how quick does the upstream rate drop on distance?

[re: orly] [link to this post]

Cheers orly,

Has your DS band plan changed recently & if so did it affect anything such as attenuation/sync speeds etc?

DS: (32,859) (1216,1963) (2792,3959)
i.e. 20 more tones available for DS (subject to having a low enough attenuation).

Chrysalis
(eat-sleep-adslguide) Fri 08-Jun-12 00:17:45

Re: how quick does the upstream rate drop on distance?

[re: deleted] [link to this post]

ok thanks

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