Upstream speed high on long line
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Upstream speed high on long line
17-09-2016 12:36 PM
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Hello there,
I live around 4.km from the nearest cabinet so have fairly poor broadband speeds. However, recently my upstream speed which was always around the 440kbps mark has increased to around 930kbps. This is creating all sorts of bit errors etc. The thing I find most strange is that my attainable upstream rate is sometimes less than my actual rate, there is no margin between like my downstream. Because of this I feel its affecting my attainable downstream with all these errors.
Hopefully someone can shed some light on this issue.
SNR Margin (dB) | 12.0 | 5.9 |
Attenuation (dB) | 54.0 | 32.5 |
Output Power (dBm) | 0.0 | 12.6 |
Attainable Rate (Kbps) | 2816 | 928 |
Rate (Kbps) | 2563 | 928 |
Re: Upstream speed high on long line
17-09-2016 12:51 PM
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I don't think it's likely that your downstream is being affected by your high upstream speed.
There's obviously some problem with the downstream because the SNR Margin at 12 is higher than the usual. But it's more likely to be some general problem with your line, internal wiring, filter(s) or modem/router.
Re: Upstream speed high on long line
17-09-2016 12:54 PM
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It is likely that either you have been moved to 21CN or Plusnet have uncapped the upload
Regarding the attainable downstream being higher than actual this is because your default noise margin has increased from 6dB to 12dB
Errors on upstream won't directly affect the downstream
Re: Upstream speed high on long line
17-09-2016 1:04 PM
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Hi ejs, I've recently overhauled the internal wiring and removed all secondary cabling, fitted faceplate filter and replaced my router with a billion 7800dlx. BT cable is well away from power sources.
Re: Upstream speed high on long line
17-09-2016 1:12 PM
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Oldjim, will the errors on the upstream add to the errors being picked up by the DLM?
Re: Upstream speed high on long line
17-09-2016 1:19 PM
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Perhaps more diagnostics from my router may help, the line has been up for 4 hours.
Downstream | Upstream | |
Line Coding (Trellis) | On | On |
SNR Margin (dB) | 12.1 | 5.8 |
Attenuation (dB) | 54.0 | 32.5 |
Output Power (dBm) | 0.0 | 12.6 |
Attainable Rate (Kbps) | 2836 | 932 |
Rate (Kbps) | 2563 | 928 |
K (number of bytes in DMT frame) | 0 | 0 |
R (number of check bytes in RS code word) | 0 | 0 |
S (RS code word size in DMT frame) | 0 | 0 |
D (interleaver depth) | 16 | 4 |
Delay (msec) | 8 | 5 |
INP (DMT symbol) | 1.00 | 0.00 |
Super Frames | 888481 | 802246 |
Super Frame Errors | 65 | 3 |
RS Words | 28875590 | 3015823 |
RS Correctable Errors | 165220 | 23 |
RS Uncorrectable Errors | 113 | 0 |
HEC Errors | 35 | 0 |
OCD Errors | 0 | 0 |
LCD Errors | 0 | 0 |
Total Cells | 87171709 | 31517032 |
Data Cells | 11790688 | 994479 |
Bit Errors | 0 | 142 |
Total ES | 65 | 3 |
Total SES | 0 | 0 |
Total UAS | 45 | 45 |
Re: Upstream speed high on long line
17-09-2016 2:59 PM
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Those stats show there are hardly any errors, especially on the upstream.
I think K, R, S are more applicable to ADSL1, and this is evidently ADSL2/2+, which may explain why those all show as zero.
What exchange are you on?
Re: Upstream speed high on long line
17-09-2016 3:10 PM
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Well thats what I thought yesterday but this morning there were thousands of HEC and bit errors etc after 24hrs. Exchange is Wick NSWIC.
Re: Upstream speed high on long line
17-09-2016 3:23 PM
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I think that exchange has been 21CN for a fairly long time, perhaps Plusnet uncapped your upstream while moving you to their "new network", if they moved you recently. Or it's recently been uncapped for some other reason.
Re: Upstream speed high on long line
19-09-2016 7:11 PM
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Slight update, had plusnet cap my upload to 440kbps in a bid to reduce errors which seems to have worked, problem is my interleaver profile has now changed and although my attainable downstream is 3500kbps I'm only acheiving 2200kbps. Perhaps some gurus could help diagnose?
Mode | ADSL_2 | |
Traffic Type | ATM | |
Status | Up | |
Link Power State | L0 | |
Downstream | Upstream | |
Line Coding (Trellis) | On | On |
SNR Margin (dB) | 7.3 | 20.5 |
Attenuation (dB) | 55.0 | 32.5 |
Output Power (dBm) | 0.0 | 12.6 |
Attainable Rate (Kbps) | 3516 | 940 |
Rate (Kbps) | 2268 | 444 |
K (number of bytes in DMT frame) | 0 | 0 |
R (number of check bytes in RS code word) | 0 | 0 |
S (RS code word size in DMT frame) | 0 | 0 |
D (interleaver depth) | 416 | 1 |
Delay (msec) | 7 | 0 |
INP (DMT symbol) | 4.00 | 0.00 |
Super Frames | 11753234 | 10783166 |
Super Frame Errors | 1747 | 312 |
RS Words | 928280256 | 3864954 |
RS Correctable Errors | 899202 | 0 |
RS Uncorrectable Errors | 0 | 0 |
HEC Errors | 707 | 346 |
OCD Errors | 0 | 0 |
LCD Errors | 0 | 0 |
Total Cells | 85627619 | 16758828 |
Data Cells | 7044769 | 481467 |
Bit Errors | 0 | 0 |
Total ES | 1205 | 194 |
Total SES | 10 | 6 |
Total UAS | 134 | 124 |
Re: Upstream speed high on long line
19-09-2016 7:25 PM
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They haven't only capped the upstream (probably fairly pointlessly), it looks like they've also set a banded profile with a higher than usual INP level of 4, which has resulted in the very high interleaving depth (for ADSL) of 416.
You need someone from Plusnet to confirm, but it certainly looks like they've set INP (interleaving) to high, and I think that can only be done in conjunction with banded speed profiles.
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