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Standard User AvengerUK
(member) Wed 13-Apr-16 12:06:24
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VDSL FEC Errors and Resyncs?


[link to this post]
 
Hi all,

I've recently (ish) moved from ADSL2+ to VDSL.

I originally synced at 55+ - but this has settled to ~50 on the down, usually 17 on the up.

I've been running DSLStats for a week or two, and noticed the FEC error count, and also some odd resyncs (weirdly, as I came onto this PC to visit kitz, so not sure if it was interference or what!, my master socket runs a cable under carpets ~10meters from where it actually drops from the loft, so wouldn't suprise me).

For example:

Reason: 1 Remote Defect Indicator/DLM

Current Downstream Sync Rate is now 50228kbps
Current Upstream Sync Rate is now 16211kbps

Followed by a few minutes later:


Reason: 1 Remote Defect Indicator/DLM

Current Downstream Sync Rate is now 51159kbps
Current Upstream Sync Rate is now 16214kbps

No idea what this means! - doesen't happen regulary but it does happen "now and again"

Running DSLStats to Mydslwebstats under username "AvengerUK"

Thanks smile

I should note, Plusnet were certain I had a fault, due to sync speed and estimates etc etc, BT Engineer came, was a waste of time, no faults found and sync is apparently "very good" for my area!
Standard User RobertoS
(elder) Wed 13-Apr-16 21:25:03
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Re: VDSL FEC Errors and Resyncs?


[re: AvengerUK] [link to this post]
 
Does your kit give the attenuation and noise margin figures as well as the sync speeds please? It's better if we can see the three together.

Could you post the estimates from this checker, including the line above the table but with your number removed of course.

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 59546/15321kbps @ 600m. - BQM
Standard User AvengerUK
(member) Fri 15-Apr-16 19:14:38
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Re: VDSL FEC Errors and Resyncs?


[re: RobertoS] [link to this post]
 
It does indeed smile

Downstream Upstream
Line Coding (Trellis) On On
SNR Margin (dB) 6.0 5.9
Attenuation (dB) 17.9 0.0
Output Power (dBm) 13.2 7.6
Attainable Rate (Kbps) 50023 18399
Rate (Kbps) 50225 18380
B (# of bytes in Mux Data Frame) 227 227
M (# of Mux Data Frames in an RS codeword) 1 1
T (# of Mux Data Frames in an OH sub-frame) 0 0
R (# of redundancy bytes in the RS codeword) 12 14
S (# of data symbols over which the RS code word spans) 0.1444 0.3945
L (# of bits transmitted in each data symbol) 13298 4907
D (interleaver depth) 4 4
I (interleaver block size in bytes) 240 242
N (RS codeword size) 240 242
Delay (msec) 0 0
INP (DMT symbol) 54.00 45.00
OH Frames 0 0
OH Frame Errors 6369 4372
RS Words 1310192780 367008
RS Correctable Errors 19330 29465
RS Uncorrectable Errors 0 0
HEC Errors 0 0
OCD Errors 0 0
LCD Errors 0 0
Total Cells 290535469 0
Data Cells 153510213 0
Bit Errors 0 0
Total ES 117 1061
Total SES 117 241
Total UAS 475 358


and the estimates are:

http://i.imgur.com/yMrW04k.jpg

Thanks! smile


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Standard User BatBoy
(sensei) Fri 15-Apr-16 19:17:50
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Re: VDSL FEC Errors and Resyncs?


[re: AvengerUK] [link to this post]
 
All the disconnections indicate a wiring problem and I suspect the wire under the carpet.
Standard User AvengerUK
(member) Fri 15-Apr-16 22:55:07
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Re: VDSL FEC Errors and Resyncs?


[re: BatBoy] [link to this post]
 
In reply to a post by BatBoy:
All the disconnections indicate a wiring problem and I suspect the wire under the carpet.


That wouldn't suprise me.

Problem is, the engineer who came to test the line 1) found no faults and 2) wasn't interested in anything else

Not keen on the £120 price tag frown
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