What speed should I be getting from my line?

I have had my installation and line checked by OR Broadband engineer last week as I think my connection is capable of higher download speeds. 6 Months ago I was getting around 78Mb download this suddenly dropped to around 54Mb. And has remained at this rate, even at 78mb there was no interleaving.
The line ATTN has been a constant 14.4 and the engineer�s tester reported a 400Mtr line length. I�m connected through a HG612 unlocked Modem to a R7000 Router the modem is connected to the main socket with a short (12in) cat cable with no other sources of close interference, have also connected directly to test socket. DLM was reset but only showing 55Mb
Link to stats for the last 2 days http://postimg.org/gallery/11ue4wnp2/
Sorry for the long post any comments welcome Thanks John

xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 21614 Kbps, Downstream rate = 56632 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 52836 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): 7.3 6.4
Attn(dB): 14.4 0.0
Pwr(dBm): 13.6 4.7
VDSL2 framing
Bearer 0
MSGc: 18 150
B: 239 236
M: 1 1
T: 64 5
R: 14 16
S: 0.1446 0.3771
L: 14056 5410
D: 1 1
I: 254 255
N: 254 255

Counters
Bearer 0
OHF: 117799692 833596
OHFErr: 324 135
RS: 3244185501 2348954
RSCorr: 8041 1215
RSUnCorr: 2051 0
Bearer 0
HEC: 1390 0
OCD: 39 0
LCD: 39 0
Total Cells: 2006934125 0
Data Cells: 163808074 0
Drop Cells: 0
Bit Errors: 0 0
ES: 492 190
SES: 11 13
UAS: 67 56
AS: 273542
Bearer 0
INP: 0.00 0.00
INPRein: 0.00 0.00
delay: 0 0
PER: 2.32 6.15
OR: 82.68 202.87
AgR: 52918.32 20203.27
Bitswap: 152778/152779 749/770
Total time = 1 days 13 hours 12 min 45 sec
FEC: 145759 5982
CRC: 4925 270
ES: 492 190
SES: 11 13
UAS: 67 56
LOS: 1 0
LOF: 7 0
LOM: 0 0
Latest 15 minutes time = 12 min 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
Previous 15 minutes time = 15 min 0 sec
FEC: 1 2
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 = 13 hours 12 min 45 sec
FEC: 605 187
CRC: 56 18
ES: 50 16
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 2190 341
CRC: 87 39
ES: 70 33
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 3 days 3 hours 59 min 1 sec
FEC: 8041 1215
CRC: 324 135
ES: 271 115
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0

55 to 65 Mbps once cross talk is accounted for.

So on the low side, but not at the it is a disaster level.

Cross talk increases as more people order the service, and it can be a sudden drop depending on where in the cable bundle the other VDSL2 lines are.

Thanks for the reply, how do I tell if the cause is crosstalk from Modem stats I am at the very lower end of BT Wholesale fttc checker.
Range A Clean High 80 Low 64 Downstream High 20 Low 20 Upstream
Range B Impacted High 79.6 Low 52.9Downstream High 20 Low 12.2 Upstream

I'm on a 450m line with 16.5 dB attenuation - so yours at 400 & 14.4 is about right.

Mine is obviously "quiet" with little cross talk and I see around 77Mbps - top end of estimates. As you say, you are towards teh low end and it is all noise related.

You can't.

Only way you get a chance to see it is if their is a power cut locally and you can get your modem to connect (e.g. UPS) when everyone elses is off.

A technology called vectoring is in the cusp of rolling out, keeps getting trialled and this should reduce the effects of cross talk

Your downstream noise margin is a bit high, but steady. Normal is more around 6.1dB, so perhaps your last connection was at a noisy time? That's worth a bit.

Thank you for the fast replies, as an OAP (Silver surfer) I find it difficult to interpret all the info from the stats. I am connected to an ECI Cabinet, as I understand it could be a long time for G.inp and or Vectoring to be enabled.

Nobody seems to know whether G.INP will be implemented on ECI cabs, but if you are on fast path it makes little difference.

Vectoring is also an unknown as to whether there will be a nationwide rollout. There are other technologies being trialled that may be preferred by Openreach.