router can fail to connect to VDSL and switches over to ADSL

I've just recently returned to UK living overseas and have move into a flat. I'm having issues where my router will sometimes fail to establish a VDSL line and will switch over to ADSL.

I've just start a new connection last week, and i've found that about 30% of the time the router will fail to connect to VDSL and will establish a ADSL line instead, at a very slow speed. I am bit reluctant to keep rebooting as the line is still establishing itself with DSL. Last night it the middle of the night the router automatically switch back over to ADSL, so woke up with very slow internet. Until i rebooted again.

My ISP is sending new (better) router this week, after complaining. I'm current signed up on 63mpbs plan, but i struggling to get much more than 36 plan, and left disappointed at my current speeds

My questions is where would be the fault. I'm in a flat that just over 10 years old, and it appears from what i can tell the cabinet is outside the block of flats. The ISP have done a line check and tell me that is working fine. I'm just wondering if there much i can do about it.

I believe i'm being wholesales vai LLU talk talk network

Thanks in advance

That can’t be, (in theory) the DSL filters in the VDSL cabinet will stop any ADSL signal coming through.

Ok thanks, i am wondering that there might be a cabinet fault here, so that helpful to know that. It seems to have been better today. i will take more details next time i have a problem with it.

Thanks

on a different router that is no standard ISP, it will connect to ADSL_2Plus at a very low speed

here the DSL information

DSL synchronization status:
Up
Connection status:
Showtime
Upstream line rate (kbit/s):
431
Downstream line rate (kbit/s):
4047
Maximum upstream rate (kbit/s):
444
Maximum downstream rate (kbit/s):
4804
Upstream noise safety coefficient (dB):
18.3
Downstream noise safety coefficient (dB):
13.3
Upstream interleave depth:
0
Downstream interleave depth:
0
Line standard:
ADSL_2plus
Upstream line attenuation (dB):
18.5
Downstream line attenuation (dB):
28.5
Upstream output power (dBmV):
9.7
Downstream output power (dBmV):
0
Downstream interleave depth:
None
DSL up time:
0 days 0 hours 2 minutes 33 seconds

Yes, my ISP router can also connect to either ADSL or VDSL. it mostly connects to VDSL, so am i correct that normally you shouldn't have both an ADSL and VDSL service on the same line?


============================================================================
ADSL Training Status: G.994 Training
Mode: ADSL2+
Traffic Type: Inactive
Link Uptime: 0 day: 0 hour: 0 minute
============================================================================
ADSL Port Details Upstream Downstream
Line Rate: 0.000 Mbps 0.000 Mbps
Actual Net Data Rate: 0.000 Mbps 0.000 Mbps
Trellis Coding: N/A N/A
SNR Margin: 0.0 dB 0.0 dB
Actual Delay: 0 ms 0 ms
Transmit Power: 0.0 dBm 0.0 dBm
Receive Power: 0.0 dBm 0.0 dBm
Actual INP: 0.0 symbols 0.0 symbols
Attainable Net Data Rate: 0.000 Mbps 0.000 Mbps
============================================================================

ADSL Counters

Downstream Upstream
Since Link time = 25 sec
FEC: 25819 1602
CRC: 0 0
ES: 0 1055
SES: 0 18
UAS: 45 1988567
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 1
HostInitRetr: 1
FailedRetr: 1
Latest 15 minutes time = 4 min 13 sec
FEC: 25819 1602
CRC: 0 0
ES: 0 1055
SES: 0 18
UAS: 227 1988794
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 1
HostInitRetr: 1
FailedRetr: 6
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
Retr: N/A
HostInitRetr: N/A
FailedRetr: N/A
Latest 1 day time = 4 min 13 sec
FEC: 25819 1602
CRC: 0 0
ES: 0 1055
SES: 0 18
UAS: 227 1988794
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 1
HostInitRetr: 1
FailedRetr: 6
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
Retr: 0
HostInitRetr: 0
FailedRetr: 0
Total time = 4 min 13 sec
FEC: 25819 1602
CRC: 0 0
ES: 0 1055
SES: 0 18
UAS: 227 1988794
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 1
HostInitRetr: 1
FailedRetr: 6
============================================================================

Yes, it shouldn’t connect on both …. either something wrong your end, possibly a DSLAM port issue …. or, as an incredibly rare fault, a rectified split pair.

I’d suggest your best course of action would be to report the fault via your service provider, and see if they can get Openreach to come and test your service, and rectify any faults they find.

Hi, yes i spoke with my ISP this morning...

I showed them the status with modem on ADSL active, they rebooted the modem remotely and it switched to VDSL sync (as below)

They told me there appears to be a line fault and will get openreach to investigate, and will book that in, hopefully it just as simple issue in at DSLAM.

Thanks for your help, it has helped me as my ISP kept going on about wifi being my problem, it took a couple of attempts to move off being a wifi issue



============================================================================
VDSL Training Status: Showtime
Mode: VDSL2 Annex B
VDSL Profile: Profile 17a
G.Vector: Disable
Traffic Type: PTM Mode
Link Uptime: 0 day: 0 hour: 7 minutes
============================================================================
VDSL Port Details Upstream Downstream
Line Rate: 7.388 Mbps 43.221 Mbps
Actual Net Data Rate: 7.194 Mbps 43.128 Mbps
Trellis Coding: ON ON
SNR Margin: 9.4 dB 6.1 dB
Actual Delay: 4 ms 12 ms
Transmit Power: - 1.4 dBm 13.1 dBm
Receive Power: -16.1 dBm 0.1 dBm
Actual INP: 4.0 symbols 7.0 symbols
Total Attenuation: 14.7 dB 12.8 dB
Attainable Net Data Rate: 13.867 Mbps 58.605 Mbps
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 11.0 13.4 18.0 N/A 9.5 14.7 19.2
Signal Attenuation(dB): 10.8 13.0 17.9 N/A 10.6 14.6 19.2
SNR Margin(dB): 11.0 10.0 9.3 N/A 5.9 6.1 6.1
Transmit Power(dBm):- 7.3 -35.1 - 2.7 N/A 9.6 7.2 7.4
============================================================================

VDSL Counters

Downstream Upstream
Since Link time = 7 min 53 sec
FEC: 660238 1246
CRC: 0 0
ES: 0 1055
SES: 0 18
UAS: 0 2024956
LOS: 0 0
LOF: 0 0
LOM: 0 0
Retr: 0
HostInitRetr: 0
FailedRetr: 0
Latest 15 minutes time = 8 min 31 sec
FEC: 660238 1246
CRC: 0 0
ES: 7 1055
SES: 7 18
UAS: 30 2024986
LOS: 0 0
LOF: 7 0
LOM: 0 0
Retr: 1
HostInitRetr: 0
FailedRetr: 0
Previous 15 minutes time = 15 min 0 sec
FEC: 533 0
CRC: 0 0
ES: 2 0
SES: 2 0
UAS: 0 0
LOS: 1 0
LOF: 2 0
LOM: 0 0
Retr: N/A
HostInitRetr: N/A
FailedRetr: N/A
Latest 1 day time = 10 hours 23 min 31 sec
FEC: 704837 2848
CRC: 0 0
ES: 9 2110
SES: 9 36
UAS: 279 4013802
LOS: 1 0
LOF: 9 0
LOM: 0 0
Retr: 2
HostInitRetr: 1
FailedRetr: 6
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
Retr: 0
HostInitRetr: 0
FailedRetr: 0
Total time = 10 hours 23 min 31 sec
FEC: 704837 2848
CRC: 0 0
ES: 9 2110
SES: 9 36
UAS: 279 4013802
LOS: 1 0
LOF: 9 0
LOM: 0 0
Retr: 2
HostInitRetr: 1
FailedRetr: 6
============================================================================

In the meantime - does your router give you the option to choose your connection method? I remember the old Sky Hubs used to do both and you could tell it to try VDSL only. Might give you a little relief, as it will just drop an ADSL connection

Yeah, i did try to disable it, but then it wouldn't connect at all, i've got two routers and one of them just refuses to connect to VDSL at all. It generally hold the connect for a reasonable time, and most of the time it connects back to VDSL.

More than likely that it's the CPE that is defaulting to ADSL when there's no connection.