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Standard User WilliamGrimsley
(committed) Thu 06-Apr-17 12:30:39
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Is My Copper Pair Really Perfect?


[link to this post]
 
Hi guys,

Here's a snapshot of my line stats, my line doesn't look perfect to me, but maybe it is. What do you think?

xDSL
Mode VDSL2
Traffic Type PTM
Status Up
Link Power State L0
Downstream Upstream
Line Coding (Trellis) On On
SNR Margin (dB) 6.1 5.9
Attenuation (dB) 23.9 0.0
Output Power (dBm) 12.2 6.2
Attainable Rate (Kbps) 41567 7900
Rate (Kbps) 35133 7900
B (# of bytes in Mux Data Frame) 51 239
M (# of Mux Data Frames in an RS codeword) 1 1
T (# of Mux Data Frames in an OH sub-frame) 64 42
R (# of redundancy bytes in the RS codeword) 12 0
S (# of data symbols over which the RS code word spans) 0.0471 0.9653
L (# of bits transmitted in each data symbol) 10872 1989
D (interleaver depth) 687 1
I (interleaver block size in bytes) 64 120
N (RS codeword size) 64 240
Delay (msec) 8 0
INP (DMT symbol) 3.00 0.00
OH Frames 55783113 16541027
OH Frame Errors 137 251
RS Words 1395491262 3608878
RS Correctable Errors 64338779 0
RS Uncorrectable Errors 2733 0
HEC Errors 549 0
OCD Errors 0 0
LCD Errors 0 0
Total Cells 2813848446 0
Data Cells 297968023 0
Bit Errors 0 0
Total ES 55 212
Total SES 0 1
Total UAS 30 30

Sync: 35133/7900 Kbps.
Standard User WilliamGrimsley
(committed) Thu 06-Apr-17 12:45:34
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Re: Is My Copper Pair Really Perfect?


[re: WilliamGrimsley] [link to this post]
 
Then, downstream G.INP is applied! tongue

Sync: 35133/7900 Kbps.

Edited by WilliamGrimsley (Thu 06-Apr-17 12:45:50)

Standard User RobertoS
(elder) Thu 06-Apr-17 12:57:56
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Re: Is My Copper Pair Really Perfect?


[re: WilliamGrimsley] [link to this post]
 
In reply to a post by WilliamGrimsley:
Then, downstream G.INP is applied! tongue
What's this about?

Re your opening post, I thought you said you aren't obsessive? It's the third post of your stats in three days. Your line is performing normally. I doubt if any line is perfect 24 hours after installation.

Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 63790/13596Kbps @ 600m. BQMs - IPv4 & IPv6


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Standard User WilliamGrimsley
(committed) Thu 06-Apr-17 13:02:30
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Re: Is My Copper Pair Really Perfect?


[re: RobertoS] [link to this post]
 
I was just asking to see if the errors shown above looked quite high. Though, downstream G.INP seems to be dealing with the downstream ones now. Thanks.

Sync: 35133/7900 Kbps.

Edited by WilliamGrimsley (Thu 06-Apr-17 13:03:12)

Standard User RobertoS
(elder) Thu 06-Apr-17 13:04:10
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Re: Is My Copper Pair Really Perfect?


[re: WilliamGrimsley] [link to this post]
 
We can't comment on your G.INP stats as you haven't posted them. It isn't active in your OP. That's why I asked what your second post was about.

Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 63790/13596Kbps @ 600m. BQMs - IPv4 & IPv6

Edited by RobertoS (Thu 06-Apr-17 13:05:41)

Standard User WilliamGrimsley
(committed) Thu 06-Apr-17 13:06:11
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Re: Is My Copper Pair Really Perfect?


[re: RobertoS] [link to this post]
 
That's because it went live shortly before I posted it had... I'll post again if downstream errors still occur with it activated.

Sync: 40225/7660 Kbps.
Standard User WelshWArrior
(fountain of knowledge) Thu 06-Apr-17 13:11:56
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Re: Is My Copper Pair Really Perfect?


[re: WilliamGrimsley] [link to this post]
 
I think you just answered your own question - surely if your line was 'perfect' it wouldn't need g.inp!

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Standard User lee111s
(experienced) Thu 06-Apr-17 13:21:11
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Re: Is My Copper Pair Really Perfect?


[re: WilliamGrimsley] [link to this post]
 
What's the obsession with a perfect line?

Unless you're within a few metres of the cab, every line is always going to have some sort ot "issue".

As long as they're not service affecting, in my opinion, they're not issues.
Standard User David_W
(knowledge is power) Thu 06-Apr-17 13:49:10
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Re: Is My Copper Pair Really Perfect?


[re: RobertoS] [link to this post]
 
In reply to a post by RobertoS:
Re your opening post, I thought you said you aren't obsessive? It's the third post of your stats in three days. Your line is performing normally. I doubt if any line is perfect 24 hours after installation.
Not only is William obsessing, but there is no such thing as a 'perfect' line outside the textbooks. All lines are inherently imperfect - there is attenuation, crosstalk, common mode noise and other effects in play.


William - stop looking at the statistics; you'll only stress yourself. Store a copy away for reference and glance at them occasionally unless you have service affecting fault or notice a serious performance deterioration. Even if you care about small and essentially insignificant changes in your statistics, Openreach don't, so nothing will be done about the change. Indeed, Openreach will usually do nothing about a fairly hefty drop in sync speed due to additional crosstalk; they've taken the (perfectly reasonable) decision to invest in additional FTTP and G.FAST rather than deploying vectoring on VDSL2. It isn't feasible to send an engineer to switch a user to a different D side pair every time the user notices increasing crosstalk and there is no guarantee that a better pair is available. Even if Openreach did carry out a pair swap, there is no guarantee that a pair that is better initially will not succumb to greater crosstalk in the future.

Most of the time DLM behaves fairly sensibly, though you have to remember it aims to stabilise lines rather than eke out the last bit of available speed. Openreach's FTTC DLM is not perfect, but it does a pretty good job most of the time.

FTTC is intended to be fit and forget, not fit and tweak incessantly. It's a low cost product that is provided on the basis that there is a reasonably high threshold for an issue to be accepted as a fault.



ZeN Unlimited Fibre 2 with native IPv6
thinkbroadband speed test : speedtest.net : thinkbroadband quality monitor IPv4 IPv6

Edited by David_W (Thu 06-Apr-17 14:16:42)

Standard User lee111s
(experienced) Thu 06-Apr-17 13:57:06
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Re: Is My Copper Pair Really Perfect?


[re: David_W] [link to this post]
 
Amen brother.
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