Post your FTTC line stats & unlocking info

Locky said:
Have you got any stats before you was on trial?
Click to expand...
I dont no, sorry...


Gammawolf said:
The upstreams so far are disappointing I hope its something that will improve with the main 80/20 roll out... but i doubt it
Click to expand...

The highest i've had so far on speedtests is this for my upstream....

1827052747.png
 
Neither are any better/worse. :)

BT Speedtester says this...

Upload speed achieved during the test was - 16.27Mbps
Additional Information:
Upstream Rate IP profile on your line is - 20 Mbps
Click to expand...

Am happy with that tbh, its not at all bad is it!? :)
 
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 28625 Kbps, Downstream rate = 85928 Kbps
Path: 0, Upstream rate = 10000 Kbps, Downstream rate = 39998 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3939)
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3939)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 28625 kbps 85928 kbps
Actual Aggregate Tx Power: 1.1 dBm 13.8 dBm
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 3.5 13.8 18.1 N/A 8.6 16.9 24.7
Signal Attenuation(dB): 5.5 12.8 17.3 N/A 8.6 16.9 24.7
SNR Margin(dB): 23.5 22.4 22.5 N/A 19.2 19.1 19.2
TX Power(dBm): -13.6 -34.8 0.9 N/A 11.2 8.2 6.3

==========================================================

# xdslcmd info --show
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 28633 Kbps, Downstream rate = 85928 Kbps
Path: 0, Upstream rate = 10000 Kbps, Downstream rate = 39998 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): 19.1 22.5
Attn(dB): 0.0 0.0
Pwr(dBm): 13.8 1.1
VDSL2 framing
Path 0
B: 239 111
M: 1 2
T: 64 50
R: 0 16
S: 0.1909 0.7101
L: 10055 2704
D: 1 1
I: 240 120
N: 240 240
Counters
Path 0
OHF: 189825 65919
OHFErr: 0 0
RS: 0 3295502
RSCorr: 0 0
RSUnCorr: 0 0

Path 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 44721325 0
Data Cells: 1320 0
Drop Cells: 0
Bit Errors: 0 0

ES: 0 0
SES: 0 0
UAS: 21 21
AS: 585

Path 0
INP: 0.00 0.00
PER: 3.05 8.87
delay: 0.00 0.00
OR: 65.46 55.88

Bitswap: 0 0
 
JoshShep said:
Bald_Eagle1 said:
Not that I am aware of

This is the first thing I would find out, I have aluminium all the way to the cab, my length is 580m and It's been there for over 30 years, this has impacted my speed a great deal!
Click to expand...


Well, as I achived a sync speed of 35Mb over the "at least" 800m when FTTC was installed using the old 8c profile, I assume it is copper, or not much of it to be aluminium.

I have asked various visiting engineers, but it must be a "secret" as none of them have confirmed either way :(

One engineer came quite close when he said some of it "might" be aliuminium.

If anything, following the switch to the 17a Profile in October, I believe my connection should now be quicker/more stable.

My Attainable Rate now varies between 34 Mb & 36.3Mb, but am currently only syncing at 29.8Mb.
Click to expand...
 
Bald_Eagle1 said:
JoshShep said:
Well, as I achived a sync speed of 35Mb over the "at least" 800m when FTTC was installed using the old 8c profile, I assume it is copper, or not much of it to be aluminium.

I have asked various visiting engineers, but it must be a "secret" as none of them have confirmed either way :(

One engineer came quite close when he said some of it "might" be aliuminium.

If anything, following the switch to the 17a Profile in October, I believe my connection should now be quicker/more stable.

My Attainable Rate now varies between 34 Mb & 36.3Mb, but am currently only syncing at 29.8Mb.
Click to expand...

Right you should be seeing better results on a 17a profile, my attainable rate is 45 but I'm only syncing at 24, I am now waiting to be put 80/20 so that should improve things. if your connection isn't stable at higher speeds that is why DLM is lowering your speeds, to stabilize and reduce errors on your connection, DLM is a nasty thing, I used to be on TT LLU where DLM doesn't exist. All I can say is try 80/20 and see what happens, and ask to be put on a different pair "Lift and Shift" going to the cab if that's not been done already. FTTC is not good on longer lines, BT need to start looking after customers like me and yourself and improve our speeds before spending more money on new installs, everyone in your area will also have problems so know your not allone.
Click to expand...
 
I was recently accepted on the 80/20 speed trial and have only seen a small speed increase on my line. The DSL availability checker reports that I should be able to get 38Mbps DL and 6Mbps UL, however I am pretty sure that I have always received closer to 8Mbps UL. Since being moved across onto the trial I am now receiving approx 45Mbps DL and 13Mbps UL. While these speeds are obviously very respectable, I do not believe that they are representative of what my line should be able to support based on my distance to the nearest FTTC cabinet which is approx 600-700 metres away.

The attenuation on my line looks excessively high to me for line of that length.

Code: 
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max:    Upstream rate = 15944 Kbps, Downstream rate = 48460 Kbps
Path:   0, Upstream rate = 15851 Kbps, Downstream rate = 54243 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783) 
DS: (32,859) (1216,1963) (2792,3939) 
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) (1972,2783) 
DS: (32,859) (1216,1963) (2792,3939) 
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:      15944 kbps         48460 kbps
Actual Aggregate Tx Power:        6.8 dBm          13.6 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  5.4     28.3    42.3     N/A    14.2    34.8    53.9
Signal Attenuation(dB):  8.6     27.3    41.3     N/A    14.2    34.8    53.9
        SNR Margin(dB):  5.4     5.3     5.3      N/A    4.3     4.3     4.2
         TX Power(dBm): -4.2    -16.8    6.4      N/A    10.7    7.7     5.9
 
@ OllieD,

Looking at your stats, your connection is in sync at 54.243Mb.

using 96.79% of that, your IP profile SHOULD be around 52.502Mb.

Throughput speed using speedtest.net SHOULD be around 96% - 97% of IP Profile i.e. say 50.6Mb.

I see your SNRM is quite low, hence your sync speed currently being actually higher than your attainable rate of 48.460Mb.

SOMETIMES, a ROUTER reset (not modem reset) is required to start a new PPP session which will update your IP Profile in relation to your current sync speed.

For curiosity, from the BT Speed test, what is your current IP Profile & throughput speed?

If IP Profile is much different to the 52.502Mb I mentioned above, it might be worth a router reset & check the difference again as soon as the BT speed test will allow it.

Resetting the modem would have the same effect (starting a new PPP session), but it COULD be seen by DLM as instability & end up with a lower sync speed.


Paul.
 
Last edited:
@ Bald_Eagle1,

Many thanks for the prompt reply.

I reset the PPPoE session and ran the BT Speed Test which states that I have an IP profile 44.98Mbps. Upstream rate IP profile is 20Mbps. Actual DL speed achieved during the test was 30Mbps and UL speed was 13.38Mbps. Using Speedtest.net, my actual DL speed was 44.09Mbps and UL was 14.10Mbps.

I have a second line into the house which has business Infinity on it. This is still on the 40/10 service (i.e. not in the speed trial), however the line stats are almost identical (see below). I would kind of expect this to be the case, as it will likely be a similar distance to the cabinet, same cable construction and subjected to simlar levels of noise. I just don't think that the properties of both lines is that great, given the relative distance to the cabinet.

Code: 
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 2
Max:    Upstream rate = 16999 Kbps, Downstream rate = 51216 Kbps
Path:   0, Upstream rate = 10000 Kbps, Downstream rate = 39998 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783) 
DS: (32,859) (1216,1963) (2792,3939) 
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) (1972,2783) 
DS: (32,859) (1216,1963) (2792,3939) 
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:      16999 kbps         51216 kbps
Actual Aggregate Tx Power:        6.8 dBm          13.2 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  5.4     28.0    41.5     N/A    14.2    34.5    53.0
Signal Attenuation(dB):  8.8     27.2    40.2     N/A    14.2    34.5    53.0
        SNR Margin(dB):  11.6    11.5    11.4     N/A    9.8     9.9     10.4
         TX Power(dBm): -4.3    -16.9    6.4      N/A    10.8    7.8     4.4

One thing that is worth noting is that the cabinet is a long way from the exchange. When on the old ADSL products I was lucky to get 1-2Mbps DL on each service as my house is about 7km from the exchange.
 
OllieD said:
@ Bald_Eagle1,

I reset the PPPoE session and ran the BT Speed Test which states that I have an IP profile 44.98Mbps. Upstream rate IP profile is 20Mbps. Actual DL speed achieved during the test was 30Mbps and UL speed was 13.38Mbps. Using Speedtest.net, my actual DL speed was 44.09Mbps and UL was 14.10Mbps.
Click to expand...

That all looks a bit strange & contradicts the 96.79% calculation that is seen on most/all 40Mb capped connections.

I have read though, that the BT speed test & connections generally are currently "struggling" to cope with the 80/20 trialists & that throughput is very "variable" for many users.


I take it the first connection you mentioned is still reporting this:-

Max: Upstream rate = 15944 Kbps, Downstream rate = 48460 Kbps
Path: 0, Upstream rate = 15851 Kbps, Downstream rate = 54243 Kbps

The only other option I can think of is that for whatever reason, your "throughput" profile is being capped by BT, which in turn is causing a lower IP Profile than should be expected for your sync speed.

I have a second line into the house which has business Infinity on it. This is still on the 40/10 service (i.e. not in the speed trial), however the line stats are almost identical (see below). I would kind of expect this to be the case, as it will likely be a similar distance to the cabinet, same cable construction and subjected to simlar levels of noise. I just don't think that the properties of both lines is that great, given the relative distance to the cabinet.

Code: 
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 2
Max:    Upstream rate = 16999 Kbps, Downstream rate = 51216 Kbps
Path:   0, Upstream rate = 10000 Kbps, Downstream rate = 39998 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783) 
DS: (32,859) (1216,1963) (2792,3939) 
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) (1972,2783) 
DS: (32,859) (1216,1963) (2792,3939) 
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:      16999 kbps         51216 kbps
Actual Aggregate Tx Power:        6.8 dBm          13.2 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  5.4     28.0    41.5     N/A    14.2    34.5    53.0
Signal Attenuation(dB):  8.8     27.2    40.2     N/A    14.2    34.5    53.0
        SNR Margin(dB):  11.6    11.5    11.4     N/A    9.8     9.9     10.4
         TX Power(dBm): -4.3    -16.9    6.4      N/A    10.8    7.8     4.4
Click to expand...

I see you have spare SNRM on this other connection, which confirms the attainable rate being higher than the capped sync speed.
Using the 96.79% calculation again, your IP Profile should be around 38.72Mb for this connection.

One thing that is worth noting is that the cabinet is a long way from the exchange. When on the old ADSL products I was lucky to get 1-2Mbps DL on each service as my house is about 7km from the exchange.
Click to expand...



That COULD explain the lowish power levels, as ADSL signals will be quite weak after travelling such a distance, so power is reduced slightly on FTTC connections to help avoid crosstalk issues.

I have noticed that users whose cabinets are close to the exchange have higher DS power levels.
 
I take it the first connection you mentioned is still reporting this:-

Max: Upstream rate = 15944 Kbps, Downstream rate = 48460 Kbps
Path: 0, Upstream rate = 15851 Kbps, Downstream rate = 54243 Kbps
Click to expand...

No it isn't. It's now reporting the following:

Max: Upstream rate = 14907 Kbps, Downstream rate = 49012 Kbps
Path: 0, Upstream rate = 14814 Kbps, Downstream rate = 48193 Kbps

I still believe that the attenuation levels appear high for both lines. I'm just wondering if I'm expecting too much based on what I was receiving on the 40/20 service before the 17a profile. Now if only I had line stats from when I was still on the 8c profile....
 
OllieD said:
No it isn't. It's now reporting the following:

Max: Upstream rate = 14907 Kbps, Downstream rate = 49012 Kbps
Path: 0, Upstream rate = 14814 Kbps, Downstream rate = 48193 Kbps

I still believe that the attenuation levels appear high for both lines. I'm just wondering if I'm expecting too much based on what I was receiving on the 40/20 service before the 17a profile. Now if only I had line stats from when I was still on the 8c profile....
Click to expand...



These are my stats - anywhere between 800m & 1100m from the cabinet, which is around 4300m from the exchange:-


Code: 
# xdslcmd info --pbParams 
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:	2
Max:	Upstream rate = 5747 Kbps, Downstream rate = 35008 Kbps
Path:	0, Upstream rate = 5847 Kbps, Downstream rate = 29822 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783) 
DS: (32,859) (1216,1963) (2792,3939) 
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) 
DS: (32,859) (1216,1963) 
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:       5747 kbps         35008 kbps
Actual Aggregate Tx Power:        6.3 dBm          12.9 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):	 8.3	 53.1	 64.0	  N/A	 21.6	 63.3	 0.1	
Signal Attenuation(dB):	 14.5	 52.5	  N/A	  N/A	 21.6	 63.3	  N/A	
        SNR Margin(dB):	 5.7	 5.8	  N/A	  N/A	 6.3	 6.1	  N/A	
         TX Power(dBm):	-4.3	 5.8	  N/A	  N/A	 10.9	 6.5	  N/A


My attenuation is too high to get anything at all from the higher 17a band plan.


I have some similar stats from my 8c Profile, but unfortunately NOT from when FTTC was installed (when I achieved better speeds & stability than I have done for quite a few months).

Quite a bit of work has been carried on on my D-side copper, but I believe there is still "something" causing my attenuation to be too high, or that output power from the cabinet has been adjusted lower than it needs to be for crosstalk purposes.

Getting anyone to confirm any of this is turning out to be practically impossible.
 
I was actually already aware of your particular plight after reading your posts on another forum - all 31 pages of it! :eek: Very interesting reading though.

I just can't help feeling that my D-side could be performing better. I live on a cul-de-sac that is only just over 10 years old and the cable runs underground. I am still not 100% sure which cabinet I am on, however the nearest one that I have located should be about 600-700m from me according to some rough calcs using google maps!
 
Well i've been onto BT using the number given to me in the email regarding the 80/20 trial. This didn't really change anything and I am getting a call back from one of their product experts later, in order to facilitate the next phase of testing.

In the meantime, I decided to mess about with a few things myself and powered off all of the other electrical devices in the room and did some testing with just my laptop (running on battery), the BT HH3 (which I don't normally use, but had to use when testing with BT) and the OR VDSL modem.

I ran the BT Speed Test which states that I now have an IP profile 56.46Mbps. Upstream rate IP profile is 20Mbps. Actual DL speed achieved during the test was 50Mbps and UL speed was 13.84Mbps. Using Speedtest.net to the Manchester server, my actual DL speed was now 54.51Mbps and UL was 14.29Mbps.

Code: 
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max:    Upstream rate = 14616 Kbps, Downstream rate = 48908 Kbps
Path:   0, Upstream rate = 15963 Kbps, Downstream rate = 58324 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783) 
DS: (32,859) (1216,1963) (2792,3939) 
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) (1972,2783) 
DS: (32,859) (1216,1963) (2792,3939) 
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:      14616 kbps         48908 kbps
Actual Aggregate Tx Power:        6.8 dBm          13.4 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  5.4     28.1    42.1     N/A    14.2    34.7    53.6
Signal Attenuation(dB):  8.1     27.2    41.3     N/A    14.2    34.7    53.6
        SNR Margin(dB):  5.1     5.1     5.0      N/A    3.0     3.1     3.3
         TX Power(dBm): -4.1    -17.0    6.4      N/A    10.8    7.8     5.9

Strangely, my sync rate is yet again higher than my attainable rate. Is this likely due to my DL SNR now being 3.2 (see below)?

Code: 
# xdslcmd info --show    
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max:    Upstream rate = 14623 Kbps, Downstream rate = 48904 Kbps
Path:   0, Upstream rate = 15963 Kbps, Downstream rate = 58324 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):        3.2             5.1
Attn(dB):        0.0             0.0
Pwr(dBm):        13.4            6.8
                        VDSL2 framing
                        Path 0
B:              239             223
M:              1               1
T:              64              64
R:              0               16
S:              0.1310          0.4464
L:              14661           4301
D:              1               1
I:              240             120
N:              240             240
                        Counters
                        Path 0
OHF:            1217692         358935
OHFErr:         1390            2
RS:             0               1489867
RSCorr:         0               18
RSUnCorr:       0               0

                        Path 0
HEC:            122             0
OCD:            0               0
LCD:            0               0
Total Cells:    287203237               0
Data Cells:     8350949         0
Drop Cells:     0
Bit Errors:     0               0

ES:             72              2
SES:            2               0
UAS:            16              16
AS:             2564

                        Path 0
INP:            0.00            0.00
PER:            2.09            7.14
delay:          0.00            0.00
OR:             91.63           31.36

Bitswap:        622             283

I still believe that I have an exceptionally noisy line that is affected by any additional interference.
 
Last edited:
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