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Author Topic: BT Infinity FTTC connection speed poor - graphs and stats available  (Read 16396 times)

asbokid

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    • Hacking the 2Wire
Re: BT Infinity FTTC connection speed poor - graphs and stats available
« Reply #30 on: August 09, 2012, 04:38:53 PM »

I think that's where I belong!  ???  Sorry for causing the confusion everyone, especially Crystal_Ship!  Hopefully Baldy_Bird can tidy up the mess!
 
cheers, a
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crystal_ship

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Re: BT Infinity FTTC connection speed poor - graphs and stats available
« Reply #31 on: August 09, 2012, 10:20:47 PM »

Hello asbokid!

No worries! I'm glad you took the time to contribute your ideas - after all, every day is a school day!  ;D

I just wish this so called "10 day training period" would hurry up... things aren't changing at all and BT only want to know the state of play once that time is up....

So what we are saying is that the line is noisy or it's cross talk? This seems to be a very common issue, sadly.
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Bald_Eagle1

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Re: BT Infinity FTTC connection speed poor - graphs and stats available
« Reply #32 on: August 09, 2012, 10:36:12 PM »

sorry, i didn't even notice you had said that about the drop in max attainable rate when lifting the handset. Definitely worth getting to the bottom of that.  I don't know anything much about line faults, HR joints, etc..  Though the filters/splitters in the faceplates do sometimes fail.  And of course there's another splitter/filter at the other end (on the linecard in the cabinet). That potentially could fail.  Doesn't seem very likely though.



I have experienced dodgy external pole top connections AND failed filtered faceplates.

The symptoms were:-

Many random disconnections due to weak/corroded cable connection(s)

SNRM & Attainable rates dropping substantially (sometimes enough to cause a disconnection) caused simply by picking up a telephone.
Dialling in always seemed to effect a temporary cure that lasted from a few hours to a couple of days.

These issues were always more apparent during warm/hot & dry weather conditions & less apparent during wet & cold weather conditions.

It took around 11 months & many engineer visits to finally get these intermittent issues fixed.
Without the benefit of graphical & raw data evidence, I am convinced my connection would never have been fixed as it was always classed as being "within acceptable performance limits" by BT (& initially my ISP).

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Bald_Eagle1

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Re: BT Infinity FTTC connection speed poor - graphs and stats available
« Reply #33 on: August 09, 2012, 10:41:56 PM »


So what we are saying is that the line is noisy or it's cross talk? This seems to be a very common issue, sadly.



It seems to have BECOME quite a bit noisier than it was.
This could be crosstalk or electrical interference or failing cable connection(s) etc.

As the changes are fairly pronounced, it may be worthy of engineer investigation (at the risk that you may be charged if no network fault is found).

I can't recall the exact fault threshold levels, but they are much lower than the speeds you are currently achieving.

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crystal_ship

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Re: BT Infinity FTTC connection speed poor - graphs and stats available
« Reply #34 on: August 09, 2012, 11:20:14 PM »

Thank you.

I already had a copper technician pay a visit, unfortunately though the crackling had gone (and funnily enough that was on 29/07/2012 when the download line stats jumped!) - so he declared no fault found and refused to check and recrimp the joints on the line.

I'm hoping I won't be charged for this - I haven't heard anything since. The call handler at BT India heard the crackling himself when I was reporting the fault.

Hopefully a broadband technician will be on the case once BT agree.

The copper chap said that they measure line stats at certain points along the line to identify where it drops off.

I think BT state that 15mb is the minimum acceptable line sync rate. I don't think £40 a month including line rental justifies that. I could get far more on cable for less (though I gather VM isn't without its problems - but I either choose cable or BT for the last mile)

The line checker states 55.2/18mb as the predicted rate. If I get back to the original 60mb+ I will stay, otherwise I will have to negotiate an exit with BT if it's way below that.

Happy days!
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crystal_ship

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Re: BT Infinity FTTC connection speed poor - graphs and stats available
« Reply #35 on: August 10, 2012, 08:13:34 PM »

Using rs-w v0.4 (thanks Eric!)

Here are this evening's telnet stats and bitloading graph. It's day 8 of the "10 day training period"

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   2
Max:   Upstream rate = 11585 Kbps, Downstream rate = 42908 Kbps
Path:   0, Upstream rate = 11935 Kbps, Downstream rate = 36378 Kbps

Link Power State:   L0
Mode:         VDSL2 Annex B
VDSL2 Profile:      Profile 17a
TPS-TC:         PTM Mode
Trellis:      U:ON /D:ON
Line Status:      No Defect
Training Status:   Showtime
      Down      Up
SNR (dB):    6.4       5.9
Attn(dB):    0.0       0.0
Pwr(dBm):    12.4       6.8
         VDSL2 framing
         Path 0
B:      63      237
M:      1      1
T:      64      47
R:      16      16
S:      0.0560      0.6338
L:      11435      3206
D:      577      1
I:      80      127
N:      80      254
         Counters
         Path 0
OHF:      62346447      50638
OHFErr:      79      33
RS:      3380631745      332552
RSCorr:      31297535      2075
RSUnCorr:   2448      0

         Path 0
HEC:      517      0
OCD:      0      0
LCD:      0      0
Total Cells:   3163202013      0
Data Cells:   10405532      0
Drop Cells:   0
Bit Errors:   0      0

ES:      131032      258
SES:      246      11
UAS:      154      154
AS:      168149

         Path 0
INP:      3.00      0.00
PER:      2.68      7.44
delay:      8.00      0.00
OR:      71.46      34.37

Bitswap:   41055      9872

Total time = 1 days 19 hours 43 min 28 sec
FEC:      64740917      272898
CRC:      55776      592
ES:      131032      258
SES:      246      11
UAS:      154      154
LOS:      40      7
LOF:      40      7
Latest 15 minutes time = 13 min 28 sec
FEC:      205937      0
CRC:      4      0
ES:      1      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
Previous 15 minutes time = 15 min 0 sec
FEC:      198018      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
Latest 1 day time = 19 hours 43 min 28 sec
FEC:      13217560      64
CRC:      24      12
ES:      8      12
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
Previous 1 day time = 24 hours 0 sec
FEC:      15778789      1959
CRC:      45      19
ES:      14      19
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
Since Link time = 1 days 22 hours 42 min 29 sec
FEC:      31297535      2075
CRC:      79      33
ES:      25      33
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
#


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Bald_Eagle1

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Re: BT Infinity FTTC connection speed poor - graphs and stats available
« Reply #36 on: August 11, 2012, 08:49:36 AM »

QLN & Hlog unly update during the resyncing process as the connection trains & the data sticks until the next retrain.

However, Bit-loading & SNR do change dynamically throughout the duration of a connection between resyncs/retrains.

Have there been any further changes to the graphs (my script versions) & if so, do these changes appear to be time-of-day related?


Have you tried my ongoing 24/7 scripts that will flag any changes & error counts minute-by-minute?


Eric's rsw.exe monitors SNRM changes, but as yet doesn't include any graphical error count details etc. & doesn't yet display all the 4096 available bit-loading tones in one screen.

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