Errors on my VDSL line, should I be getting higher speeds

Hi I am on BT Infinity FTTC 80/20 product. I am wondering if I should be getting higher download speeds than I currently get? I must be mayble 500 meters to the cabinet. Here are my line stats.


xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 2
Max: Upstream rate = 16358 Kbps, Downstream rate = 42928 Kbps
Path: 0, Upstream rate = 16921 Kbps, Downstream rate = 42931 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3959)
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3959)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 16358 kbps 42928 kbps
Actual Aggregate Tx Power: 6.7 dBm 12.6 dBm
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 5.0 26.4 38.9 N/A 13.4 32.7 50.3
Signal Attenuation(dB): 5.0 25.5 38.2 N/A 13.4 32.7 50.3
SNR Margin(dB): 5.5 5.7 5.7 N/A 6.0 5.9 6.1
TX Power(dBm): -4.0 -16.5 6.3 N/A 8.8 8.1 6.2

xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 2
Max: Upstream rate = 16336 Kbps, Downstream rate = 42928 Kbps
Path: 0, Upstream rate = 16921 Kbps, Downstream rate = 42931 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): 6.0 5.7
Attn(dB): 0.0 0.0
Pwr(dBm): 12.3 6.6
VDSL2 framing
Path 0
B: 239 237
M: 1 1
T: 64 64
R: 0 16
S: 0.1779 0.4475
L: 10793 4541
D: 1 1
I: 240 127
N: 240 254
Counters
Path 0
OHF: 254709550 894438
OHFErr: 8125 166
RS: 0 2684639
RSCorr: 0 1325
RSUnCorr: 0 0

Path 0
HEC: 3604 0
OCD: 0 0
LCD: 0 0
Total Cells: 4209749790 0
Data Cells: 3585117872 0
Drop Cells: 0
Bit Errors: 0 0

ES: 2245 186
SES: 31 0
UAS: 261 261
AS: 727822

Path 0
INP: 0.00 0.00
PER: 2.84 7.15
delay: 0.00 0.00
OR: 73.07 32.40

Bitswap: 145182 29048

According to all the stats that's as good as it will get.

In that case then would it be worth my while asking people in my area to drop their fttc connections and switch back to adsl 2+

Which part of the stats are you looking at?

Here's an example where the stats look a little worse, but the sync speeds are quite a bit higher:-

Text

1 23 45 67 89 1011 1213 1415 1617 1819 2021

xdslcmd: ADSL driver and PHY status Status: ShowtimeRetrain Reason: 2 Max:    Upstream rate = 20704 Kbps, Downstream rate = 66720 KbpsPath:   0, Upstream rate = 20000 Kbps, Downstream rate = 65822 Kbps  Discovery Phase (Initial) Band Plan US: (0,95) (868,1207) (1972,2783) DS: (32,859) (1216,1963) (2792,3959) Medley Phase (Final) Band PlanUS: (0,95) (868,1207) (1972,2783) DS: (32,859) (1216,1963) (2792,3959)        VDSL Port Details       Upstream        Downstream Attainable Net Data Rate:      20704 kbps         66720 kbpsActual Aggregate Tx Power:        6.8 dBm          13.4 dBm ============================================================================  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3   Line Attenuation(dB):  5.2     26.9    40.2     N/A    13.6    33.8    52.4   Signal Attenuation(dB):  7.5     25.9    39.3     N/A    13.6    33.8    52.4           SNR Margin(dB):  6.0     6.5     6.5      N/A    4.9     5.5     7.6             TX Power(dBm): -4.5    -15.9    6.4      N/A    10.4    7.9     6.7

Edited by deleted (Sat 20-Oct-12 16:21:16)

LOL.

In reply to a post by Hellish:

Hi I am on BT Infinity FTTC 80/20 product. I am wondering if I should be getting higher download speeds than I currently get? I must be mayble 500 meters to the cabinet. Here are my line stats.

You're about the same distance as me to the cabinet and you have the same download, and DOUBLE the upload that I have. I think you're very lucky :-/

In reply to a post by Bald_Eagle1:

Which part of the stats are you looking at?

The only 2 that matter, the respective maximum attainable rates.

In areas of high take up speeds will drop due to crosstalk, that's the nature of the beast and is even more of an issue with VDSL than ADSL. That the two lines have similar attenuations isn't relevant unfortunately.

As mentioned by jchamier, I had also noticed the "lowish" downstream speeds in comparison with the "highish" upstream speeds, thinking there was maybe an unusual situation there (maybe something was possibly restricting downstream speeds).

QLN & SNR data/graphs may indeed show high interference "noise" levels that could more or less confirm high crosstalk levels (or again possibly indicate some sort of a fault on the DS other than high attenuation that is not apparently the issue).

Just for curiosity, for similar connection speeds, what are other users seeing as attenuation values?




EDIT:

FWIW, I did see my own connection's DS speeds reduce when my US cap was increased from 2Mb to up to 10Mb (I actually achieve around 4.5Mb US).
Switching between 40/2 & 40/10 as an experiment a couple of times via my ISP did seem to prove the point.

I wonder if an 80/10 capped connection would allow higher DS speeds at the expense of some US speed (on some connections)?

Edited by deleted (Sat 20-Oct-12 18:22:38)

Higher downstream sync but lower upstream here.

# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max:    Upstream rate = 13889 Kbps, Downstream rate = 57664 Kbps
Path:   0, Upstream rate = 14641 Kbps, Downstream rate = 57485 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3959)
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3959)
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:      13889 kbps         57664 kbps
Actual Aggregate Tx Power:        6.6 dBm          13.6 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  5.3     29.6    44.5     N/A    14.4    36.3    55.7
Signal Attenuation(dB):  8.6     28.6    43.3     N/A    14.4    36.3    55.7
        SNR Margin(dB):  5.8     5.6     5.6      N/A    6.1     5.9     6.0
         TX Power(dBm): -3.9    -12.8    6.3      N/A    11.1    7.9     4.2

In reply to a post by RobertoS:

Higher downstream sync but lower upstream here.

Higher attenuation too.

I have a long-standing very clean d-side connection, since it was re-wired from the pole, plus new wire along the front of the house from where the dropwire is attached, and through the wall direct into an NTE5 new at the same time.

In reply to a post by RobertoS:

I have a long-standing very clean d-side connection, since it was re-wired from the pole, plus new wire along the front of the house from where the dropwire is attached, and through the wall direct into an NTE5 new at the same time.

Me too.

Mine was replaced last November. One continuous drop wire from pole-top DP to master socket.

I'm so far from the cabinet though that I can't max out a 40Mb connection & thus really do notice subtle changes in conditions that would normally be masked by a connection that can max out 40/2, 40/10 or 80/20 connections.

e.g. the increase in DS band plan tones from a max of 3939 to 3959 around April 2012 appeared to have a slight negative effect upon my connection's DS speeds (even though I can't actually make use of the higher frequency DS/US bands.

I haven't previously seen such high US speeds & low DS speeds as the first post in this thread though (& I have looked at quite a few connection stats since asbokid first developed the unlocking firmware ).

My best connection speeds were at the time of the 8C profile - where everything available at that time (40Mb DS) was squeezed into the lower frequency tones.

Here's mine, but Bald_Eagles seen these quite often, I'm on a 450 meter line and only get 42 meg down. My line attenuation is a lot higher than the op's

# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 11346 Kbps, Downstream rate = 49552 Kbps
Path: 0, Upstream rate = 10681 Kbps, Downstream rate = 42000 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959) (2792,4083)
Medley Phase (Final) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 11346 kbps 49552 kbps
Actual Aggregate Tx Power: 6.9 dBm 11.0 dBm
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 2.1 32.7 50.5 N/A 16.1 42.2 64.1
Signal Attenuation(dB): 2.0 32.5 50.2 N/A 16.1 42.2 N/A
SNR Margin(dB): 6.7 6.3 6.6 N/A 6.0 6.2 N/A
TX Power(dBm): -4.4 -9.2 6.5 N/A 8.6 7.4 N/A
#
# xdslcmd info --Bits
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 11346 Kbps, Downstream rate = 49552 Kbps
Path: 0, Upstream rate = 10681 Kbps, Downstream rate = 42000 Kbps

The thing that stands out to me is the differences in downstream power levels.

I'm not sure if the difference is related to the way in which each cabinet is calibrated so as to not interfere with local ADSL/2+ signals coming from the exchange (which limits power at ADSL frequencies), or if it a PBO (power back-off) because of interference in high take-up areas.