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Standard User willfurnell
(newbie) Mon 01-May-17 14:03:02
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Insight into VDSL stats


[link to this post]
 
Hello,
I've been having some slower-than-hoped line speeds recently. It looks like interleaving has been applied on the line and is the cause, but I wanted to post the modem stats here to see if I could get any more insight on how to read these properly to help debugging issues in the future.

Thanks.

Stats from Draytek Vigor 130, connection reset a little while before posting.

> vdsl status
---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
Running Mode : 17A State : SHOWTIME
DS Actual Rate : 34999000 bps US Actual Rate : 11999000 bps
DS Attainable Rate : 54200248 bps US Attainable Rate : 15545250 bps
DS Path Mode : Interleave US Path Mode : Interleave
DS Interleave Depth : 1647 US Interleave Depth : 189
NE Current Attenuation : 19 dB Cur SNR Margin : 8 dB
DS actual PSD : 5. 8 dB US actual PSD : 5. 9 dB
NE CRC Count : 0 FE CRC Count : 64481
NE ES Count : 0 FE ES Count : 52239
Xdsl Reset Times : 0 Xdsl Link Times : 2
ITU Version[0] : b5004946 ITU Version[1] : 544e0000
VDSL Firmware Version : 05-07-06-0D-01-07 [with Vectoring support]
Power Management Mode : DSL_G997_PMS_L0
Test Mode : DISABLE
-------------------------------- ATU-C Info ---------------------------------
Far Current Attenuation : 23 dB Far SNR Margin : 6 dB
CO ITU Version[0] : b5004946 CO ITU Version[1] : 544eb206
DSLAM CHIPSET VENDOR : < IFTN >

> vdsl status more
---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
Near End Far End Note
Trellis : 1 1
Bitswap : 0 1
ReTxEnable : 0 0
VirtualNoise : 0 0
20BitSupport : 0 0
LatencyPath : 0 0
LOS : 0 0
LOF : 0 0
LPR : 0 0
LOM : 0 0
SosSuccess : 0 0
NCD : 0 0
LCD : 0 0
FECS : 90921 432147256 (seconds)
ES : 0 52239 (seconds)
SES : 0 7 (seconds)
LOSS : 0 511 (seconds)
UAS : 33 1350016 (seconds)
HECError : 0 0
CRC : 0 64481
RsCorrection : 0 0
INP : 10 40 (symbols)
InterleaveDelay : 600 1300 (1/100 ms)
NFEC : 65 52
RFEC : 16 16
LSYMB : 4078 12777
INTLVBLOCK : 65 52
AELEM : 0 ----
Standard User RobertoS
(elder) Mon 01-May-17 14:27:41
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Re: Insight into VDSL stats


[re: willfurnell] [link to this post]
 
Not just interleaving, but by the look of it also "banding".
DS Actual Rate : 34999000 bps US Actual Rate : 11999000 bps
DS Attainable Rate : 54200248 bps US Attainable Rate : 15545250 bps
Figures ending on 999000 with much higher attainable are the clue.

Lots of noise are generally what causes that.

My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 64054/13543Kbps @ 600m. BQMs - IPv4 & IPv6
Standard User willfurnell
(newbie) Mon 01-May-17 14:40:10
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Re: Insight into VDSL stats


[re: RobertoS] [link to this post]
 
Ah right, thank you. Is this something that will be automatically removed by leaving the line connected for a couple of weeks? Or if its noise, is that indictive of an actual fault?


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Standard User RobertoS
(elder) Mon 01-May-17 14:46:47
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Re: Insight into VDSL stats


[re: willfurnell] [link to this post]
 
Depends whether it is recurring high noise or a couple of heavy bursts more than once. Next time you post the stats don't restart the modem first smile.

My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 64054/13543Kbps @ 600m. BQMs - IPv4 & IPv6
Standard User willfurnell
(newbie) Sun 14-May-17 21:04:31
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Re: Insight into VDSL stats


[re: RobertoS] [link to this post]
 
Hmm it's been a couple of weeks now... still looks like the downstream and upstream are being banded or limited in some way

> vdsl status
---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
Running Mode : 17A State : SHOWTIME
DS Actual Rate : 35000000 bps US Actual Rate : 12000000 bps
DS Attainable Rate : 55261992 bps US Attainable Rate : 17744493 bps
DS Path Mode : Interleave US Path Mode : Fast
DS Interleave Depth : 722 US Interleave Depth : 1
NE Current Attenuation : 19 dB Cur SNR Margin : 9 dB
DS actual PSD : 6. 0 dB US actual PSD : 6. 2 dB
NE CRC Count : 26 FE CRC Count : 64488
NE ES Count : 7 FE ES Count : 52245
Xdsl Reset Times : 0 Xdsl Link Times : 4
ITU Version[0] : b5004946 ITU Version[1] : 544e0000
VDSL Firmware Version : 05-07-06-0D-01-07 [with Vectoring support]
Power Management Mode : DSL_G997_PMS_L0
Test Mode : DISABLE
-------------------------------- ATU-C Info ---------------------------------
Far Current Attenuation : 23 dB Far SNR Margin : 9 dB
CO ITU Version[0] : b5004946 CO ITU Version[1] : 544eb206
DSLAM CHIPSET VENDOR : < IFTN >

---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
Near End Far End Note
Trellis : 1 1
Bitswap : 1 1
ReTxEnable : 0 0
VirtualNoise : 0 0
20BitSupport : 0 0
LatencyPath : 0 0
LOS : 4 0
LOF : 0 0
LPR : 0 0
LOM : 0 0
SosSuccess : 0 0
NCD : 0 0
LCD : 0 0
FECS : 11483929 432230608 (seconds)
ES : 7 52245 (seconds)
SES : 0 7 (seconds)
LOSS : 0 511 (seconds)
UAS : 34 1350093 (seconds)
HECError : 0 0
CRC : 26 64488
RsCorrection : 0 0
INP : 0 15 (symbols)
InterleaveDelay : 0 800 (1/100 ms)
NFEC : 255 63
RFEC : 16 16
LSYMB : 3268 11825
INTLVBLOCK : 255 63
AELEM : 0 ----
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