OK here's my telnet stats and pbparams; firstly "normal" with mains on and usual household stuff running, then from around line 126 with mains off, modem powered by a car battery and connected to test socket via a microfilter.

************************************************************************************
* NORMAL - MAINS ON *
************************************************************************************


xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 853 Kbps, Downstream rate = 29464 Kbps
Bearer: 0, Upstream rate = 800 Kbps, Downstream rate = 29466 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): 6.2 5.8
Attn(dB): 22.2 0.0
Pwr(dBm): 13.0 -9.7
VDSL2 framing
Bearer 0
MSGc: 20 90
B: 239 30
M: 1 1
T: 64 18
R: 14 10
S: 0.2592 1.2043
L: 7840 279
D: 1 1
I: 254 42
N: 254 42
Counters
Bearer 0
OHF: 111598036 714508
OHFErr: 292 70
RS: 2847291679 1047259
RSCorr: 2547 67
RSUnCorr: 1243 0

Bearer 0
HEC: 843 0
OCD: 58 0
LCD: 58 0
Total Cells: 528494771 0
Data Cells: 79619546 0
Drop Cells: 0
Bit Errors: 0 0

ES: 404 83
SES: 21 0
UAS: 86 65
AS: 464602

Bearer 0
INP: 0.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 4.16 16.32
OR: 49.96 47.05
AgR: 29516.19 846.97

Bitswap: 145197/145197 73/73

Total time = 1 days 1 hours 1 min 7 sec
FEC: 3903 78
CRC: 2769 88
ES: 404 83
SES: 21 0
UAS: 86 65
LOS: 2 0
LOF: 20 0
LOM: 0 0
Latest 15 minutes time = 1 min 7 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
Previous 15 minutes time = 15 min 0 sec
FEC: 11 4
CRC: 0 2
ES: 0 2
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 1 hours 1 min 7 sec
FEC: 101 4
CRC: 9 2
ES: 4 2
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 375 12
CRC: 47 6
ES: 42 6
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 5 days 9 hours 3 min 21 sec
FEC: 2547 67
CRC: 292 70
ES: 236 60
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
#

************************************************************************************
* MAINS OFF, TEST SOCKET, MODEM ON BATTERY *
************************************************************************************

xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 853 Kbps, Downstream rate = 29464 Kbps
Bearer: 0, Upstream rate = 800 Kbps, Downstream rate = 29466 Kbps

Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3970)
Medley Phase (Final) Band Plan
US: (7,32) (871,1205)
DS: (33,859) (1216,1961)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 853 kbps 29464 kbps
Actual Aggregate Tx Power: - 9.7 dBm 13.0 dBm
====================================================================================
VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
Line Attenuation(dB): 6.3 38.1 N/A N/A N/A 17.0 47.0 74.6
Signal Attenuation(dB): 6.3 36.0 N/A N/A N/A 22.5 46.6 N/A
SNR Margin(dB): 5.8 5.9 N/A N/A N/A 6.1 6.2 N/A
TX Power(dBm): -15.1 -11.2 N/A N/A N/A 11.5 7.6 N/A







# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 859 Kbps, Downstream rate = 29548 Kbps
Bearer: 0, Upstream rate = 800 Kbps, Downstream rate = 29682 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 6.1
Attn(dB): 22.2 0.0
Pwr(dBm): 13.0 -9.1
VDSL2 framing
Bearer 0
MSGc: 20 118
B: 241 29
M: 1 1
T: 64 14
R: 12 10
S: 0.2594 1.1873
L: 7832 283
D: 1 1
I: 254 42
N: 254 42
Counters
Bearer 0
OHF: 11037 2711
OHFErr: 0 0
RS: 691082 151840
RSCorr: 0 0
RSUnCorr: 0 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 2611260 0
Data Cells: 58 0
Drop Cells: 0
Bit Errors: 0 0

ES: 0 0
SES: 0 0
UAS: 22 22
AS: 46

Bearer 0
INP: 0.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 4.16 16.68
OR: 49.91 59.44
AgR: 29731.79 859.12

Bitswap: 8/8 1/1

Total time = 1 min 8 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 22 22
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 1 min 8 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 22 22
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 15 minutes 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
Latest 1 day time = 1 min 8 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 22 22
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 = 45 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
#


xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 853 Kbps, Downstream rate = 29464 Kbps
Bearer: 0, Upstream rate = 800 Kbps, Downstream rate = 29466 Kbps

Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3970)
Medley Phase (Final) Band Plan
US: (7,32) (871,1205)
DS: (33,859) (1216,1961)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 853 kbps 29464 kbps
Actual Aggregate Tx Power: - 9.7 dBm 13.0 dBm
====================================================================================
VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
Line Attenuation(dB): 6.3 38.1 N/A N/A N/A 17.0 47.0 74.6
Signal Attenuation(dB): 6.3 36.0 N/A N/A N/A 22.5 46.6 N/A
SNR Margin(dB): 5.8 5.9 N/A N/A N/A 6.1 6.2 N/A
TX Power(dBm): -15.1 -11.2 N/A N/A N/A 11.5 7.6 N/A
#

It looks like you posted the same pbParams data twice.

However, regardless of that, there seems to be very little difference when running from the battery.

Was ALL the mains power switched off for the battery driven test?

If so, it does appear that you have at least eliminated any potential sources of interference from within your house.



It's certainly an odd problem.
At least the 4 Mbps that you previously achieved looks about right at that distance & with those DS speeds, attenuation levels etc.


These are my stats from an 1100m connection:-

Text

1 23 45 67 89 1011 1213 1415 1617 1819 2021 2223 24

xdslcmd info --pbParams xdslcmd: ADSL driver and PHY statusStatus: Showtime Retrain Reason: 1Last initialization procedure status:   0 Max:    Upstream rate = 3915 Kbps, Downstream rate = 21292 KbpsBearer: 0, Upstream rate = 4165 Kbps, Downstream rate = 21488 Kbps  Discovery Phase (Initial) Band Plan US: (7,32) (871,1205) (1972,2782) DS: (33,859) (1216,1961) (2793,3970) Medley Phase (Final) Band PlanUS: (7,32) (871,1196) DS: (33,859) (1216,1646)           VDSL Port Details               Upstream                Downstream Attainable Net Data Rate:            3915 kbps              21292 kbpsActual Aggregate Tx Power:             7.0 dBm               12.4 dBm ====================================================================================  VDSL Band Status       U0      U1      U2      U3      U4      D1      D2      D3   Line Attenuation(dB):  8.3     55.4     N/A     N/A     N/A    22.0    68.1     N/A   Signal Attenuation(dB):  8.3     54.8     N/A     N/A     N/A    31.3    68.1     N/A           SNR Margin(dB):  5.6     5.6      N/A     N/A     N/A    6.1     6.1      N/A            TX Power(dBm):  0.7     5.8      N/A     N/A     N/A    11.3    5.8      N/A   .

Apparently DSL can operate on just 1 leg of the pair, at reduced speeds.

However, I'm sure the leg balance will have been tested as O.K., otherwise an engineer would have mentioned it & investigated accordingly.

It would probably also clobber your DS speeds.


Do you have another HG612 modem to try or maybe even borrow one?

It seems far too much of a reduction to be down to crosstalk.

I suspect a loose/corroded joint somewhere that could be a HR issue for your connection, maybe even causing interference for other users?

Edited by deleted (Thu 11-Sep-14 21:48:42)

Many thanks.

I'm pretty sure I didn't duplicate the pbParams test. I'm not even sure I could doing copy/paste from the clipboard with stats inbetween. Maybe it just didn't change. I can try again (when I have the house to myself).

Mains was off at the master earth leakage breaker.

This is my third modem; I bought a spare on eBay, and later an OR engineer swapped that one.

One engineer did comment that the leg balances were surprisingly similar.

Is HR high resistance? That's been checked too, though I don't know if they test at different frequencies.
My ISP is almost as frustrated as I am with BTO, who just dismiss this as crosstalk / REIN beyond their control even though the engineers that visit privately admit it can't be.

In reply to a post by Reentrant:

Many thanks.

I'm pretty sure I didn't duplicate the pbParams test. I'm not even sure I could doing copy/paste from the clipboard with stats inbetween. Maybe it just didn't change. I can try again (when I have the house to myself).

The Max & Bearer data is identical in your pbParams data, yet your 2nd xdslcmd info --stats data does indeed show different speeds.

Mains was off at the master earth leakage breaker.

Okay.

This is my third modem; I bought a spare on eBay, and later an OR engineer swapped that one.

I only asked as I wondered if it could possibly be a defective modem (clutching at straws for some sort of explanation).

One engineer did comment that the leg balances were surprisingly similar.

It does now start to be sounding more like an 'interference' issue again.

Is HR high resistance? That's been checked too, though I don't know if they test at different frequencies.

Yes. HR = High Resistance

My ISP is almost as frustrated as I am with BTO, who just dismiss this as crosstalk / REIN beyond their control even though the engineers that visit privately admit it can't be.

I can't quite accept it as being REIN/crosstalk (yet).

I do hope you update us with the actual cause (when/if it ever gets fixed).

In reply to a post by Bald_Eagle1:

I do hope you update us with the actual cause (when/if it ever gets fixed).

Will do ....

Hmm. I'm not aware of any BTO activity around here, and neither is my ISP. But two days ago I noticed that "max upstream" had increased to around 2000kbps and yesterday to around 3000kbps, although actual upstream rate was still well under 900kbps. Today I get:

Max: Upstream rate = 3912 Kbps, Downstream rate = 29376 Kbps
Bearer: 0, Upstream rate = 1999 Kbps, Downstream rate = 29376 Kbps

The previous gap in the tone map between around 950-1200 is now filled. I have no idea what - if anything - has changed nearby but it's a definite improvement.

Upstream has been slowly improving every day and is now just about back to my normal 4mbps. Apparently BTO did detect REIN from a nearby property and left a card for the owner to contact them.; that's all I know.