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Author Topic: FTTC Stats & Speeds  (Read 1006 times)

ben_strange

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  • Posts: 6
FTTC Stats & Speeds
« on: September 05, 2018, 04:40:57 PM »

Hi there,

At my grandparents there had been some issues with the FTTC here for a long time, the stability issues has now been fixed, but i'd quite like to figure out what's happened with the stats, as something doesn't seem quite right.

I have screenshots of stats from various different times which i'll detail here.

Feb 2018 - We were on a 40/10 package from Fleur Telecom (rural Talk Talk customer)
It connected at 39998/7200kbps with a SNR of 6dB for downstream and upstream. This was using a Draytek Vigor 130.

There were very frequent disconnections, and the sync speed would sometimes be as low as 20mb. By April this seemed to be mostly fixed after various cables outside were replaced.

May 2018 - We changed to BT's 52mb package. I was using the Smart Hub initially. Line stats were as follows:

Data Rate: 8252/41.29mbps
Maximum Data Rate: 8252/50220
Noise Margin: 5.6/6.3
Attenuation: 24db

After about a week, the stats improved.

Data Rate: 7.97/54.88mbps
Maximum Data Rate: 7975/56867
Noise Margin: 6.1/4.7
Attenuation: 24.1db

Shortly after, I went back to using the Draytek router with an unlocked HG612 3B, I logged everything using DSL stats running on a Raspberry Pi.

This was on the day the new modem was used:

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   0
Last initialization procedure status:   0
Max:   Upstream rate = 7432 Kbps, Downstream rate = 52884 Kbps
Bearer:   0, Upstream rate = 7432 Kbps, Downstream rate = 52091 Kbps
Bearer:   1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Link Power State:   L0
Mode:         VDSL2 Annex B
VDSL2 Profile:      Profile 17a
TPS-TC:         PTM Mode(0x0)
Trellis:      U:ON /D:ON
Line Status:      No Defect
Training Status:   Showtime
      Down      Up
SNR (dB):    3.8       6.1
Attn(dB):    24.4       0.0
Pwr(dBm):    12.1       5.1
         VDSL2 framing
         Bearer 0
MSGc:      -6      26
B:      227      223
M:      1      1
T:      0      38
R:      10      16
S:      0.1392      0.9571
L:      13677      2006
D:      4      1
I:      238      120
N:      238      240
Q:      4      0
V:      0      0
RxQueue:      125      0
TxQueue:      25      0
G.INP Framing:      18      0
G.INP lookback:      25      0
RRC bits:      0      24
         Bearer 1
MSGc:      122      -6
B:      0      0
M:      2      0
T:      2      0
R:      16      0
S:      8.0000      0.0000
L:      32      0
D:      1      0
I:      32      0
N:      32      0
Q:      0      0
V:      0      0
RxQueue:      0      0
TxQueue:      0      0
G.INP Framing:      0      0
G.INP lookback:      0      0
RRC bits:      0      0
         Counters
         Bearer 0
OHF:      0      840177
OHFErr:      4      4
RS:      218552944      1850586
RSCorr:      4986040      4
RSUnCorr:   0      0
         Bearer 1
OHF:      475455      0
OHFErr:      0      0
RS:      3803144      0
RSCorr:      36      0
RSUnCorr:   0      0

         Retransmit Counters
rtx_tx:      121816789      0
rtx_c:      457592      0
rtx_uc:      786      0

         G.INP Counters
LEFTRS:      9      0
minEFTR:   51029      0
errFreeBits:   6015401      0

         Bearer 0
HEC:      0      0
OCD:      0      0
LCD:      0      0
Total Cells:   758575731      0
Data Cells:   63501037      0
Drop Cells:   0
Bit Errors:   0      0

         Bearer 1
HEC:      0      0
OCD:      0      0
LCD:      0      0
Total Cells:   0      0
Data Cells:   0      0
Drop Cells:   0
Bit Errors:   0      0

ES:      1      5
SES:      0      0
UAS:      85      85
AS:      7637

         Bearer 0
INP:      55.00      0.00
INPRein:   1.00      0.00
delay:      0      0
PER:      0.00      9.12
OR:      0.01      28.04
AgR:      52205.41   7459.92

         Bearer 1
INP:      2.00      0.00
INPRein:   2.00      0.00
delay:      0      0
PER:      16.06      0.01
OR:      63.75      0.01
AgR:      63.75   0.01

Bitswap:   4685/4779      2/2

Total time = 2 hours 8 min 42 sec
FEC:      4986040      4
CRC:      4      4
ES:      1      5
SES:      0      0
UAS:      85      85
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 15 minutes time = 8 min 42 sec
FEC:      385287      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 15 minutes time = 15 min 0 sec
FEC:      651066      1
CRC:      0      1
ES:      0      2
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 1 day time = 2 hours 8 min 42 sec
FEC:      4986040      4
CRC:      4      4
ES:      1      5
SES:      0      0
UAS:      85      85
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 1 day time = 0 sec
FEC:      0      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Since Link time = 2 hours 7 min 17 sec
FEC:      4986040      4
CRC:      4      4
ES:      1      5
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
#

Now this was all well and good, REIN was found further along the village and seemed to remain this way, until a junction box underground at the end of the street was replaced, when the stats went to this:

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   1
Last initialization procedure status:   0
Max:   Upstream rate = 6953 Kbps, Downstream rate = 45444 Kbps
Bearer:   0, Upstream rate = 6953 Kbps, Downstream rate = 45232 Kbps
Bearer:   1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Link Power State:   L0
Mode:         VDSL2 Annex B
VDSL2 Profile:      Profile 17a
TPS-TC:         PTM Mode(0x0)
Trellis:      U:ON /D:ON
Line Status:      No Defect
Training Status:   Showtime
      Down      Up
SNR (dB):    3.4       6.1
Attn(dB):    24.4       0.0
Pwr(dBm):    12.1       4.9
         VDSL2 framing
         Bearer 0
MSGc:      -6      26
B:      227      207
M:      1      1
T:      0      39
R:      10      14
S:      0.1603      0.9497
L:      11876      1870
D:      4      1
I:      238      111
N:      238      222
Q:      4      0
V:      0      0
RxQueue:      110      0
TxQueue:      22      0
G.INP Framing:      18      0
G.INP lookback:      22      0
RRC bits:      0      24
         Bearer 1
MSGc:      90      -6
B:      0      0
M:      2      0
T:      2      0
R:      16      0
S:      10.6667      0.0000
L:      24      0
D:      1      0
I:      32      0
N:      32      0
Q:      0      0
V:      0      0
RxQueue:      0      0
TxQueue:      0      0
G.INP Framing:      0      0
G.INP lookback:      0      0
RRC bits:      0      0
         Counters
         Bearer 0
OHF:      0      1549099
OHFErr:      0      18
RS:      356384844      261545
RSCorr:      98882      27
RSUnCorr:   0      0
         Bearer 1
OHF:      892824      0
OHFErr:      0      0
RS:      5356576      0
RSCorr:      4      0
RSUnCorr:   0      0

         Retransmit Counters
rtx_tx:      241138335      0
rtx_c:      6461639      0
rtx_uc:      269853      0

         G.INP Counters
LEFTRS:      8373      0
minEFTR:   45220      0
errFreeBits:   101900144      0

         Bearer 0
HEC:      0      0
OCD:      0      0
LCD:      0      0
Total Cells:   1247389287      0
Data Cells:   4447781      0
Drop Cells:   0
Bit Errors:   0      0

         Bearer 1
HEC:      0      0
OCD:      0      0
LCD:      0      0
Total Cells:   0      0
Data Cells:   0      0
Drop Cells:   0
Bit Errors:   0      0

ES:      40      67
SES:      37      0
UAS:      234      201
AS:      14342

         Bearer 0
INP:      55.00      0.00
INPRein:   1.00      0.00
delay:      0      0
PER:      0.00      9.29
OR:      0.01      27.53
AgR:      45330.95   6981.01

         Bearer 1
INP:      2.50      0.00
INPRein:   2.50      0.00
delay:      0      0
PER:      16.06      0.01
OR:      47.81      0.01
AgR:      47.81   0.01

Bitswap:   3705/3905      22/22

Total time = 20 hours 4 min 3 sec
FEC:      29255789      390
CRC:      2180      68
ES:      40      67
SES:      37      0
UAS:      234      201
LOS:      1      0
LOF:      3      0
LOM:      0      0
Latest 15 minutes time = 4 min 3 sec
FEC:      639      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 15 minutes time = 15 min 0 sec
FEC:      2391      1
CRC:      0      1
ES:      0      1
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 1 day time = 20 hours 4 min 3 sec
FEC:      29255789      390
CRC:      2180      68
ES:      40      67
SES:      37      0
UAS:      234      201
LOS:      1      0
LOF:      3      0
LOM:      0      0
Previous 1 day time = 0 sec
FEC:      0      0
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Since Link time = 3 hours 59 min 1 sec
FEC:      98882      27
CRC:      0      18
ES:      0      17
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
#

Both of these stats were from June, this is some stats from today.

The only difference I can see, is the INP value is slight lower, and G.INP is enabled on the upstream too.


xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:   1
Last initialization procedure status:   0
Max:   Upstream rate = 7535 Kbps, Downstream rate = 40848 Kbps
Bearer:   0, Upstream rate = 7535 Kbps, Downstream rate = 42284 Kbps
Bearer:   1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Link Power State:   L0
Mode:         VDSL2 Annex B
VDSL2 Profile:      Profile 17a
TPS-TC:         PTM Mode(0x0)
Trellis:      U:ON /D:ON
Line Status:      No Defect
Training Status:   Showtime
      Down      Up
SNR (dB):    2.6       6.1
Attn(dB):    24.5       0.0
Pwr(dBm):    12.1       5.7
         VDSL2 framing
         Bearer 0
MSGc:      -6      -6
B:      227      227
M:      1      1
T:      0      0
R:      10      12
S:      0.1715      0.9624
L:      11102      1995
D:      4      4
I:      238      240
N:      238      240
Q:      4      4
V:      0      0
RxQueue:      100      12
TxQueue:      20      6
G.INP Framing:      18      18
G.INP lookback:      20      6
RRC bits:      24      24
         Bearer 1
MSGc:      90      58
B:      0      0
M:      2      2
T:      2      2
R:      16      16
S:      10.6667      16.0000
L:      24      16
D:      1      1
I:      32      32
N:      32      32
Q:      0      0
V:      0      0
RxQueue:      0      0
TxQueue:      0      0
G.INP Framing:      0      0
G.INP lookback:      0      0
RRC bits:      0      0
         Counters
         Bearer 0
OHF:      0      0
OHFErr:      435      0
RS:      466533276      415724
RSCorr:      50137917      95915
RSUnCorr:   0      0
         Bearer 1
OHF:      35777867      266629
OHFErr:      0      0
RS:      214666833      1938934
RSCorr:      5594      731
RSUnCorr:   0      0

         Retransmit Counters
rtx_tx:      251384959      3776
rtx_c:      1869051      558844
rtx_uc:      66933      1201820

         G.INP Counters
LEFTRS:      2580      2573
minEFTR:   42286      7534
errFreeBits:   636010985      298250285

         Bearer 0
HEC:      0      0
OCD:      0      0
LCD:      0      0
Total Cells:   3749479677      0
Data Cells:   499131002      0
Drop Cells:   0
Bit Errors:   0      0

         Bearer 1
HEC:      0      0
OCD:      0      0
LCD:      0      0
Total Cells:   0      0
Data Cells:   0      0
Drop Cells:   0
Bit Errors:   0      0

ES:      41      4
SES:      28      1
UAS:      300      285
AS:      574692

         Bearer 0
INP:      54.00      42.00
INPRein:   1.00      0.00
delay:      0      0
PER:      0.00      0.00
OR:      0.01      0.01
AgR:      42376.58   7551.50

         Bearer 1
INP:      2.50      4.00
INPRein:   2.50      4.00
delay:      0      0
PER:      16.06      16.06
OR:      47.81      31.87
AgR:      47.81   31.87

Bitswap:   198716/203876      2229/2244

Total time = 1 days 18 min 6 sec
FEC:      60566875      148430
CRC:      895      18
ES:      41      4
SES:      28      1
UAS:      300      285
LOS:      1      0
LOF:      3      0
LOM:      1      0
Latest 15 minutes time = 3 min 6 sec
FEC:      1806      1
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 15 minutes time = 15 min 0 sec
FEC:      9321      7
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 1 day time = 18 min 6 sec
FEC:      11127      8
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 1 day time = 24 hours 0 sec
FEC:      6909282      4317
CRC:      0      0
ES:      0      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Since Link time = 6 days 15 hours 38 min 11 sec
FEC:      50137917      95915
CRC:      435      0
ES:      21      0
SES:      11      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      1      0
#

From looking at all of this I can't actually work out an explanation to why the line is syncing at over 10mb slower, using the Smart Hub gives exactly the same results. Any help would be really appreciated.

Thanks,
Ben


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j0hn

  • Kitizen
  • ****
  • Posts: 4093
Re: FTTC Stats & Speeds
« Reply #1 on: September 06, 2018, 07:00:12 AM »

Crosstalk.
Interference from other subscribers lines on the FTTC cabinet.
It will likely get worse if the cabinet isn't full yet.

We all suffer it to varying degrees.
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Talktalk FTTP 550/75 - Speedtest - BQM

ben_strange

  • Just arrived
  • *
  • Posts: 6
Re: FTTC Stats & Speeds
« Reply #2 on: September 06, 2018, 07:02:38 AM »

Ah right, that's annoying.

Seem to also get weird SNR spikes as well sometimes.

Ben
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j0hn

  • Kitizen
  • ****
  • Posts: 4093
Re: FTTC Stats & Speeds
« Reply #3 on: September 06, 2018, 07:05:17 AM »

During that spike look at the connection speed tab.
See your attainable jump at the exact same time?

That's a neighbouring lines modem going off, then on again.
That's about 3dB SNRM jump so that line cost you a good few Mb.
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Talktalk FTTP 550/75 - Speedtest - BQM
 

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