Kitz ADSL Broadband Information
adsl spacer  
Support this site
Home Broadband ISPs Tech Routers Wiki Forum
 
     
   Compare ISP   Rate your ISP
   Glossary   Glossary
 
Please login or register.

Login with username, password and session length
Advanced search  

News:

Author Topic: Voice line issue fixed - FTTC upstream sync reduced, errors up, interference up?  (Read 193 times)

AJB2494

  • Just arrived
  • *
  • Posts: 4

Hi, I've gleaned a lot of info from this site over the years which i'm thankful for however now I make my first post seeking advice.

Historically my line sync'd at 22.4mbps down and 5.6mbps up with Sky in 2019 (March/April), G.INP enabled (HG612 and ECI cabinet), stable, e.g. 25 days with 156 ES with flat SNRM 7-7.5db.  Although I don't have stats further back, I know it sync'd at 25mbps when I first got it around 2014/2015 with Sky router.  My line is about 1,000m long.

It remained at that speed when I transferred to PlusNet in January 2020 but unfortuntely I wasn't really paying attention to my broadband performance and I don't have any stats for that period to tell me when G.INP was removed but I have a snapshot from October 2020 where it's been removed and interleaving is set to 441, INP=3.00, with an average of 150 ES per day, SNR=6.  otherwise stable connection and flat SNRM.

Fast forward to December 2020 when I notice some audible noise on line, my stats were uptime 39 days, average 100 ES per day,  22.5mbps down, 5.2mbps up, interleaving=443, INP=3.00, SNR=6.2.  I reported the fault and also asked if this could explain why my broadband connection appeared to have slowed over time since I first got it as I rarely use the phone and guessed it could have been present or slowly getting worse.

An engineer attended (31-Dec), fixing a joint where the cable enters my property, he also reset the DLM on my broadband line which resulted in higher sync speed around ~25-28mbps pending the training period.  However the noise returned on the line shortly after that, I used the quietline test and turned off all electrical appliances in my house until I turned off the main trip switch to isolate everything and the noise was still present.  A second engineer visited (13-Jan) and replaced the incoming cable which had water ingress, he told me to ask my provider (PlusNet) to reset the DLM as he couldn't (i've asked, they won't).  I now also have the new mk4 master socket.  The line is syncing ~25-26mbps down but only ~4.2mbps up, interleaving re-applied at ~517, INP=3.00, SNRM~6 but an interference pattern on SNRM and with many ES (around 200-300 per day, with some higher), which I am presuming will result in further mitigation and a reduction in performance at some point.

So far I have stated to my provider that the up sync has reduced significantly (from 5.2 to 4.2mbps) but they say estimate is 4-7mbps so there's no action to be taken at present.  Some observations I have made is that the 'Power dBm' for down and up is now 2.1db whereas previously it has been around 4-5db and my attenuation has reduced by a digit or so.  I'ver attached an SNR chart of the last 24hours which is reasonably representative of what I am observing, 'steady' through the morning to mid afternoon and then interference through the evening and entering what I would describe as reasonably stable overnight with a small period of instabilty in the morning.  PS. worth noting that I am working from home and I cannot relate the periods of interference to any electrical appliances like washing machine etc.

What is my best course of action regarding raising this further with my provider?  I am hoping that a local FFTP provider will be active in my area soon but there's no ETA or guarantees so I'm stuck with this for the time being.

Apologies for the long post and stay safe.
Regards, Alex.

Code: (Connection Stats) [Select]
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 4344 Kbps, Downstream rate = 29660 Kbps
Bearer: 0, Upstream rate = 4224 Kbps, Downstream rate = 26413 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): 6.1 6.2
Attn(dB): 25.1 0.0
Pwr(dBm): 2.1 2.1
VDSL2 framing
Bearer 0
MSGc: 22 33
B: 51 132
M: 1 1
T: 64 5
R: 12 16
S: 0.0626 0.9992
L: 8176 1193
D: 517 1
I: 64 149
N: 64 149
Counters
Bearer 0
OHF: 48901405 752091
OHFErr: 3916 0
RS: 3928762116 1647682
RSCorr: 6222420 17
RSUnCorr: 121566 0

Bearer 0
HEC: 29803 0
OCD: 2095 0
LCD: 2095 0
Total Cells: 1400024004 0
Data Cells: 287727380 0
Drop Cells: 0
Bit Errors: 0 0

ES: 663 0
SES: 5 0
UAS: 20 20
AS: 196759

Bearer 0
INP: 3.00 0.00
INPRein: 0.00 0.00
delay: 8 0
PER: 4.02 16.29
OR: 55.67 19.14
AgR: 26468.60 4242.99

Bitswap: 130681/130714 10/10

Total time = 1 days 6 hours 39 min 39 sec
FEC: 6222420 17
CRC: 3916 0
ES: 663 0
SES: 5 0
UAS: 20 20
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 9 min 39 sec
FEC: 14708 0
CRC: 28 0
ES: 1 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: 15828 0
CRC: 3 0
ES: 1 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 6 hours 39 min 39 sec
FEC: 1057699 1
CRC: 714 0
ES: 99 0
SES: 1 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 2688424 12
CRC: 1763 0
ES: 279 0
SES: 2 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 2 days 6 hours 39 min 19 sec
FEC: 6222420 17
CRC: 3916 0
ES: 663 0
SES: 5 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
#

Code: (pbParams) [Select]
Bearer: 0, Upstream rate = 4224 Kbps, Downstream rate = 26413 Kbps

Discovery Phase (Initial) Band Plan
US: (6,31) (882,1193) (1984,2770)
DS: (33,857) (1218,1959) (2795,4083)
Medley Phase (Final) Band Plan
US: (6,31) (882,1193) (1984,2093)
DS: (41,857) (1218,1959)
  VDSL Port Details   Upstream   Downstream
Attainable Net Data Rate:      4344 kbps     29660 kbps
Actual Aggregate Tx Power:        2.1 dBm       2.1 dBm
====================================================================================
  VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
  Line Attenuation(dB): 4.6 42.0 60.9 N/A N/A 19.7 52.4 82.5
Signal Attenuation(dB): 4.5 42.0 0.0 N/A N/A 24.9 52.1 N/A
        SNR Margin(dB): 6.3 6.2 0.0 N/A N/A 6.1 6.1 N/A
         TX Power(dBm): -4.6 -0.7 -3.9 N/A N/A 8.6 7.3 N/A
#
« Last Edit: January 20, 2021, 10:24:28 AM by AJB2494 »
Logged

j0hn

  • Kitizen
  • ****
  • Posts: 3321

It might not be what you want to hear but there's little you can do.
Crosstalk eats away at both the downstream and upstream.

G.INP on ECI cabinets is only in a trial and you can no longer be added to the trial so there's zero chance of that returning unless the trial is successful.

The upstream isn't banded/capped so a DLM reset would not increase upstream sync.
Actually it wouldn't increase downstream sync either. It should sync the exact same after a DLM reset (Interleave Low profile).

You're on the default DLM profile, it isn't holding the line back.
Plusnet won't send an engineer to try improve speeds as you are within your estimates.

If there's noise on the voice line then report that as a voice fault.
Any fix there "might" improve sync a little.
Logged
BT FTTP 160/30 - BQM - speed test

AJB2494

  • Just arrived
  • *
  • Posts: 4

It might not be what you want to hear but there's little you can do.
Crosstalk eats away at both the downstream and upstream.

...........

If there's noise on the voice line then report that as a voice fault.
Any fix there "might" improve sync a little.

Thanks for your reply.  I understand that crosstalk is probably the main reason for my lines performance, however I wouldn't have expected the degradation in SNRM and a 1mbps drop in upstream in one go after having the line noise fixed, I can't see how this would be normal and i'm open to how I can present it to get taken seriously.

Regards, Alex.
Logged
 

anything