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Author Topic: Thank You Power Cut!  (Read 22191 times)

William Grimsley

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Thank You Power Cut!
« on: July 13, 2016, 10:58:54 AM »

xDSL
Mode   VDSL2
Traffic Type   PTM
Status   Up
Link Power State   L0
Downstream   Upstream
Line Coding (Trellis)   On   On
SNR Margin (dB)   4.2   5.2
Attenuation (dB)   26.1   0.0
Output Power (dBm)   12.1   6.4
Attainable Rate (Kbps)   43063   8155
Rate (Kbps)   45677   8159
B (# of bytes in Mux Data Frame)   243   239
M (# of Mux Data Frames in an RS codeword)   1   1
T (# of Mux Data Frames in an OH sub-frame)   0   43
R (# of redundancy bytes in the RS codeword)   10   0
S (# of data symbols over which the RS code word spans)   0.1701   0.9348
L (# of bits transmitted in each data symbol)   11946   2054
D (interleaver depth)   8   1
I (interleaver block size in bytes)   254   120
N (RS codeword size)   254   240
Delay (msec)   0   0
INP (DMT symbol)   47.00   0.00
OH Frames   0   0
OH Frame Errors   0   0
RS Words   6980432   1279891
RS Correctable Errors   282   0
RS Uncorrectable Errors   0   0
HEC Errors   0   0
OCD Errors   0   0
LCD Errors   0   0
Total Cells   26263977   0
Data Cells   1564122   0
Bit Errors   0   0
Total ES   0   0
Total SES   0   0
Total UAS   29   29
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WWWombat

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Re: Thank You Power Cut!
« Reply #1 on: July 13, 2016, 11:18:34 AM »

and ?
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William Grimsley

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Re: Thank You Power Cut!
« Reply #2 on: July 13, 2016, 11:20:55 AM »

Sorry?
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Dray

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Re: Thank You Power Cut!
« Reply #3 on: July 13, 2016, 11:23:20 AM »

What do you mean by posting some line stats with the subject of "Thank you power cut!" ?
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William Grimsley

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Re: Thank You Power Cut!
« Reply #4 on: July 13, 2016, 11:28:59 AM »

Sorry, obviously it's not clear. ::)

Basically, we just had a power cut and because the Billion BiPAC 8800NL has a very quick DSL sync time, when the power came back on, it synced quicker than the other routers, so the line synced at a higher rate! :)
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Dray

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Re: Thank You Power Cut!
« Reply #5 on: July 13, 2016, 11:44:28 AM »

How would anyone know it was a higher rate?
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WesBez7

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Thank You Power Cut!
« Reply #6 on: July 13, 2016, 11:47:36 AM »

Agreed. @Dray. "Power cut gave higher sync rate" would be better expressed.
Seems it's a click bait topic, I see this on a forum I'm Admin of.

1) I don't believe you'll notice in real world terms.
2) it'll settle
« Last Edit: July 13, 2016, 11:52:05 AM by WesBez7 »
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William Grimsley

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Re: Thank You Power Cut!
« Reply #7 on: July 13, 2016, 12:08:01 PM »

Ok, it shows it in the line stats, if you look carefully. Oh, and it's not best to start advertising that you're an admin on another forum.
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Dray

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Re: Thank You Power Cut!
« Reply #8 on: July 13, 2016, 12:18:13 PM »

I can't see anywhere in the line stats that indicates it synced at a higher rate than before  :shrug2:
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William Grimsley

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Re: Thank You Power Cut!
« Reply #9 on: July 13, 2016, 12:21:04 PM »

Sorry, thought you knew what my line stats were before the power cut, apologies... ::)
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jid

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Re: Thank You Power Cut!
« Reply #10 on: July 13, 2016, 12:42:49 PM »

Better keep an eye on this William as already you don't have a lot of spare SNR.
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Kind Regards
Jamie

BT FTTP - 75meg | Sky Q |  Bridgend Weather

mlmclaren

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Re: Thank You Power Cut!
« Reply #11 on: July 13, 2016, 12:56:01 PM »

So your posting to say that you've got yourself a temporary couple/few thousand kbps sync due to a power cut, and that now you line will be clocking up a number of errors which will make your connection unstable and end in DLM kicking in and applying extra error correction...

Yes Thank You Power Cut  :cool:

I recommend you do a power down for 30 minutes when possible... you could see a bunch of issues when you SNR dips in the evening and from what I saw when you had MDWS a short time back your SNR wasn't the most stablest at any point, never mind the busy times.
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William Grimsley

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Re: Thank You Power Cut!
« Reply #12 on: July 13, 2016, 01:06:22 PM »

Well, actually no. I've had no Downstream ES yet and the SNR Margin is very stable, of course if the line became unstable it would resync and connect back at a SNR Margin of 6 dB, but I have no intention of performing a manual power down for 30 minutes. The line is perfectly stable currently and the SNR Margin has always been stable, just has the normal swings day-to-day.

Seems good currently:

xDSL
Mode   VDSL2
Traffic Type   PTM
Status   Up
Link Power State   L0
Downstream   Upstream
Line Coding (Trellis)   On   On
SNR Margin (dB)   4.9   5.2
Attenuation (dB)   26.1   0.0
Output Power (dBm)   12.1   6.4
Attainable Rate (Kbps)   44039   8159
Rate (Kbps)   45677   8159
B (# of bytes in Mux Data Frame)   243   239
M (# of Mux Data Frames in an RS codeword)   1   1
T (# of Mux Data Frames in an OH sub-frame)   0   43
R (# of redundancy bytes in the RS codeword)   10   0
S (# of data symbols over which the RS code word spans)   0.1701   0.9348
L (# of bits transmitted in each data symbol)   11946   2054
D (interleaver depth)   8   1
I (interleaver block size in bytes)   254   120
N (RS codeword size)   254   240
Delay (msec)   0   0
INP (DMT symbol)   47.00   0.00
OH Frames   0   0
OH Frame Errors   0   73
RS Words   191001312   536289
RS Correctable Errors   7464   0
RS Uncorrectable Errors   0   0
HEC Errors   0   0
OCD Errors   0   0
LCD Errors   0   0
Total Cells   716337324   0
Data Cells   101196216   0
Bit Errors   0   0
Total ES   0   33
Total SES   0   0
Total UAS   29   29
« Last Edit: July 13, 2016, 02:53:27 PM by burakkucat »
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mlmclaren

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Re: Thank You Power Cut!
« Reply #13 on: July 13, 2016, 03:10:15 PM »

OK if you say so.
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WWWombat

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Re: Thank You Power Cut!
« Reply #14 on: July 13, 2016, 03:42:12 PM »

Sorry, obviously it's not clear. ::)

You don't say  :doh:

I've had no Downstream ES yet and the SNR Margin is very stable,

BTW. My experience is that errors start to creep up when SNR goes below 4dB, and even more so below 3dB. Your first post shows you just getting to that threshold.

With no CRCs (and no ES), the stats you need to watch instead become the FEC and the retransmission counters.
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