Well then it seems that the lines in your area are of very poor quality.... I'm not sure if I asked this already but is Virgin Cable available to you?

The lines are aluminium but they served me very well on ADSL for 2 years and as I said solid for 2 months on VDSL. It doesn't explain (to me anyway) why my sync speed went from DS 2000 kbps to 500 kbps overnight.

No cable in my area (see my post 2 above)

Here are some stats

xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 810 Kbps, Downstream rate = 13972 Kbps
Bearer: 0, Upstream rate = 738 Kbps, Downstream rate = 14171 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)
DS: (67,857)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 810 kbps 13972 kbps
Actual Aggregate Tx Power: 5.9 dBm 8.3 dBm
====================================================================================
VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
Line Attenuation(dB): 7.8 65.6 61.7 N/A N/A 27.0 82.5 N/A
Signal Attenuation(dB): 7.8 61.4 N/A N/A N/A 31.0 N/A N/A
SNR Margin(dB): 6.2 6.1 N/A N/A N/A 6.2 N/A N/A
TX Power(dBm): 1.8 3.8 N/A N/A N/A 8.3 N/A N/A
#

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 803 Kbps, Downstream rate = 13924 Kbps
Bearer: 0, Upstream rate = 738 Kbps, Downstream rate = 14171 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 6.0
Attn(dB): 29.8 0.0
Pwr(dBm): 8.3 5.8
VDSL2 framing
Bearer 0
MSGc: 26 34
B: 239 22
M: 1 1
T: 42 17
R: 0 0
S: 0.5381 0.9684
L: 3568 190
D: 1 1
I: 240 23
N: 240 23
Counters
Bearer 0
OHF: 18377039 217242
OHFErr: 631 103
RS: 0 1011641
RSCorr: 0 0
RSUnCorr: 0 0

Bearer 0
HEC: 1889 0
OCD: 222 0
LCD: 222 0
Total Cells: 2834416176 0
Data Cells: 85440725 0
Drop Cells: 0
Bit Errors: 0 0

ES: 390 94
SES: 0 0
UAS: 21 21
AS: 104241

Bearer 0
INP: 0.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 5.67 16.52
OR: 45.13 19.36
AgR: 14216.46 757.04

Bitswap: 62986/62987 66/70

Total time = 1 days 4 hours 57 min 42 sec
FEC: 0 0
CRC: 631 103
ES: 390 94
SES: 0 0
UAS: 21 21
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 12 min 42 sec
FEC: 0 0
CRC: 3 1
ES: 3 1
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 0 0
CRC: 1 1
ES: 1 1
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 4 hours 57 min 42 sec
FEC: 0 0
CRC: 85 18
ES: 50 17
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 0 0
CRC: 546 85
ES: 340 77
SES: 0 0
UAS: 21 21
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 1 days 4 hours 57 min 19 sec
FEC: 0 0
CRC: 631 103
ES: 390 94
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
#

Edited by deleted (Tue 10-Jun-14 23:13:24)

You said your using a HG612 thats unlocked right?

If so is there an option for it to use VDSL1 only and not VDSL2 as this may help get more speed and stabilise the line due to it using lower frequencies that won't be affected by much if any crosstalk.

you got further than I did with plusnet, plusnet only sent out SFI engineers and said they had no speed boost engineers at all for FTTC, no idea if they were been honest or not with me. In my case any work I requested was rejected by engineers. Eventually I got sick of it and stopped the engineer appointments.

There is no seeable option to use VDSL1 off the top of my head

# xdslcmd profile --show

Modulations:
G.Dmt Enabled
G.lite Enabled
T1.413 Enabled
ADSL2 Enabled
AnnexL Enabled
ADSL2+ Enabled
AnnexM Disabled
VDSL2 Enabled
Phone line pair:
Inner pair
Capability:
bitswap On
sra On
trellis On
sesdrop Off
CoMinMgn Off
24k On
phyReXmt(Us/Ds) Off/On
TpsTc AvPvAa
monitorTone: On
dynamicD: On
dynamicF: Off
SOS: On
Training Margin(Q4 in dB): -1(DEFAULT)
#

I'm also dubious that VDSL1 would have the reach if I am over 1500 metres from DSLAM (just thinking out loud).

Post deleted by scotsmist

In reply to a post by Chrysalis:

you got further than I did with plusnet, plusnet only sent out SFI engineers and said they had no speed boost engineers at all for FTTC, no idea if they were been honest or not with me. In my case any work I requested was rejected by engineers. Eventually I got sick of it and stopped the engineer appointments.

That's about where I am at. The BTo engineers have stated nothing can be done to the line. Yet IMHO something has changed. Perhaps the modems power output ?

Edited by deleted (Tue 10-Jun-14 23:57:24)

Might be something we could both do with looking into...

I can't see it being impossible, It would be like the days of switching ADSL2+ back to ADSL1

I'm thinking it is the DSLAM that sets what modulations are available and I do not see ITU G.993.1 or VDSL in the modulation list displayed by xdslcmd profile --show I posted above.
I'm also thinking that my line is too long for any VDSL frequency and can only get upto ADSL2+ frequencies. I just regret not keeping my logging after VDSL was first installed when I had DS 17700 kbps and US 2742 kbps for the first 2 weeks.

all I can think of at the moment then is getting in touch with zen and see if they can get it swapped to see if it will work..

I understand your concern about line length and (a shot in the dark here) maybe it will increase the power on the line that on higher frequencies would decrease bandwidth though on lower (8mhz) frequencies it might work...

Unfortunately I don't have FTTC or even access to it so I can't try anything myself.