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Author Topic: Poor ADSL2+ speed rates?  (Read 16460 times)

sheepfarmer

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Re: Poor ADSL2+ speed rates?
« Reply #45 on: May 08, 2016, 11:52:23 AM »

...and BOOM! The SNR margin has just dropped without me doing anything from 9.9db to 1db downstream and 14.2db to 13.2db upstream.

Will do the second test later, but I reckon that a call to my ISP for a suspected REIN problem is in order. I'll let the HG612 keep running to see if it can hold the 1db SNR margin.
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aesmith

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Re: Poor ADSL2+ speed rates?
« Reply #46 on: May 08, 2016, 03:36:22 PM »

What's a little odd is that the change doesn't seem to have resulted in errors, unless your router/modem doesn't report errors.    There's a sudden increase in FECs, otherwise I'm be starting to wonder if the change in NM was actually real.
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sheepfarmer

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Re: Poor ADSL2+ speed rates?
« Reply #47 on: May 09, 2016, 07:58:57 AM »

What's a little odd is that the change doesn't seem to have resulted in errors, unless your router/modem doesn't report errors.    There's a sudden increase in FECs, otherwise I'm be starting to wonder if the change in NM was actually real.
Yeah, when the SNR margin destructing interference is present the FECs shoot right up into their thousands, though there are few or no CRC or HEC.

I didn't get a chance to test the SNR margin when the interference was on yesterday, hopefully I'll get a chance this evening.
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kitzuser87430

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Re: Poor ADSL2+ speed rates?
« Reply #48 on: May 09, 2016, 10:39:52 AM »

Is there any reason you are not uploading your stats 24/7....I can't seem to get a good handle on your stats without this; and by the way FEC's in the thousands is not really important, if they were in the 10's of thousands then there MAY be a problem.

Ian
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Dray

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Re: Poor ADSL2+ speed rates?
« Reply #49 on: May 10, 2016, 01:39:28 PM »

Would moving back to a VDSL connection be an easy fix?
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sheepfarmer

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Re: Poor ADSL2+ speed rates?
« Reply #50 on: May 11, 2016, 11:55:28 AM »

Is there any reason you are not uploading your stats 24/7....I can't seem to get a good handle on your stats without this; and by the way FEC's in the thousands is not really important, if they were in the 10's of thousands then there MAY be a problem.

Ian
Hi Ian. I don't leave my computer running 24/7 which is why the stats aren't up then. As for the FEC's, it is getting up to the tens of thousands if not hundreds of thousands IIRC, but I'll need to wait until the interference is back again before I demonstrate that.

Baa!

Would moving back to a VDSL connection be an easy fix?
Probably, but the interferer on the line would likely still be there?  :-\
I'm quite happy with ADSL2+ provided I could get something like 12Mb/s down and 1Mb/s up, 38Mb/s down is a bit wasted on me for the extra expense it would incur. If this proposed 18/2 VDSL2 trial is something I might get offered, I'd be interested though.
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sheepfarmer

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Re: Poor ADSL2+ speed rates?
« Reply #51 on: May 11, 2016, 12:02:42 PM »

Well this was interesting, earlier this morning I was doing a resync on the line and for whatever reason it went into VDSL2 mode! I didn't think this was possible unless you were specifically connected at the cabinet D-side?

Anyway, it threw up the following stats...

Code: [Select]
Stats recorded 11 May 2016 11:21:23

DSLAM/MSAN type:        BDCM:0xa48c / v0xa48c
Modem/router firmware:  AnnexA version - A2pv6C038m.d24j
DSL mode:                VDSL2 Profile 17a
Status:                  Showtime
Uptime:                  7 min 35 sec
Resyncs:                0 (since 11 May 2016 11:17:57)

Downstream Upstream
Line attenuation (dB):  50.9 0.0
Signal attenuation (dB): Not available on VDSL2
Connection speed (kbps): 8065 8519
SNR margin (dB):        7.1 6.0
Power (dBm):            12.1 7.6
Interleave depth:        4 4
INP:                    46.00 50.00
G.INP:                  Enabled Enabled
Vectoring status:        5 (VECT_UNCONFIGURED)

RSCorr/RS (%):          0.0004 0.0000
RSUnCorr/RS (%):        0.0000 0.0000
ES/hour:                0 0

Code: [Select]
xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 8652 Kbps, Downstream rate = 6188 Kbps
Bearer: 0, Upstream rate = 8519 Kbps, Downstream rate = 8065 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 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): 7.1 6.0
Attn(dB): 50.9 0.0
Pwr(dBm): 12.1 7.6
VDSL2 framing
Bearer 0
MSGc: -6 -6
B: 146 146
M: 1 1
T: 0 0
R: 16 16
S: 0.5780 0.5472
L: 2256 2383
D: 4 4
I: 163 163
N: 163 163
Q: 4 4
V: 1 1
RxQueue: 28 32
TxQueue: 7 8
G.INP Framing: 18 18
G.INP lookback: 7 8
RRC bits: 24 24
Bearer 1
MSGc: 90 58
B: 0 0
M: 2 2
T: 2 2
R: 16 16
S: 10.6667 16.0000
L: 24 16
D: 1 1
I: 32 32
N: 32 32
Q: 0 0
V: 0 0
RxQueue: 0 0
TxQueue: 0 0
G.INP Framing: 0 0
G.INP lookback: 0 0
RRC bits: 0 0
Counters
Bearer 0
OHF: 0 0
OHFErr: 0 0
RS: 3136460 3325923
RSCorr: 11 1
RSUnCorr: 0 0
Bearer 1
OHF: 28389 28440
OHFErr: 0 0
RS: 169961 113761
RSCorr: 0 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 13309 0
rtx_c: 8 0
rtx_uc: 0 0

G.INP Counters
LEFTRS: 0 0
minEFTR: 8063 8521
errFreeBits: 56083 58851

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 6671061 0
Data Cells: 969 0
Drop Cells: 0
Bit Errors: 0 0

Bearer 1
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 0 0
Data Cells: 0 0
Drop Cells: 0
Bit Errors: 0 0

ES: 82 94
SES: 55 0
UAS: 1087 1032
AS: 456

Bearer 0
INP: 46.00 50.00
INPRein: 1.00 1.00
delay: 0 0
PER: 0.00 0.00
OR: 0.01 0.01
AgR: 8106.54 8562.89

Bearer 1
INP: 2.50 4.00
INPRein: 2.50 4.00
delay: 0 0
PER: 16.06 16.06
OR: 47.81 31.87
AgR: 47.81 31.87

Bitswap: 20/20 19/19

Total time = 1 days 19 hours 56 min 6 sec
FEC: 5881921 1
CRC: 2447 129
ES: 82 94
SES: 55 0
UAS: 1087 1032
LOS: 5 0
LOF: 45 0
LOM: 0 0
Latest 15 minutes time = 11 min 6 sec
FEC: 168 1
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 126 126
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 15 minutes time = 15 min 0 sec
FEC: 0 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 60 60
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 19 hours 56 min 6 sec
FEC: 1643629 1
CRC: 445 15
ES: 10 8
SES: 10 0
UAS: 253 243
LOS: 1 0
LOF: 9 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 2337462 0
CRC: 1 5
ES: 1 5
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 7 min 35 sec
FEC: 11 1
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
#
Code: [Select]
xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 8645 Kbps, Downstream rate = 6188 Kbps
Bearer: 0, Upstream rate = 8519 Kbps, Downstream rate = 8065 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3959)
Medley Phase (Final) Band Plan
US: (871,1205) (1972,2706)
DS: (33,859) (1216,1961) (2793,3597)
  VDSL Port Details   Upstream   Downstream
Attainable Net Data Rate:      8645 kbps      6188 kbps
Actual Aggregate Tx Power:        7.6 dBm      12.1 dBm
====================================================================================
  VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
  Line Attenuation(dB): 46.2 47.7 52.7 N/A N/A 47.1 51.7 62.8
Signal Attenuation(dB): N/A 47.4 53.4 N/A N/A 47.1 51.5 63.0
        SNR Margin(dB): N/A 6.1 6.0 N/A N/A 7.1 7.1 7.1
         TX Power(dBm): N/A 2.7 5.9 N/A N/A 8.9 7.7 4.4
#
Code: [Select]
xdslcmd info --vectoring
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 8652 Kbps, Downstream rate = 6188 Kbps
Bearer: 0, Upstream rate = 8519 Kbps, Downstream rate = 8065 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps
Vectoring state: 5
VCE MAC Address: 0:0:0:0:0:0
Total error samples Ethernet pkts sent: 0
Total error samples Ethernet pkts discarded: 0
Total error samples statuses sent: 0
Total error samples statuses discarded: 0
#
Code: [Select]
Line attenuation (dB)    U0 U1 U2 U3 U4 D1 D2 D3
11 May 2016 11:18:24 46.2 47.7 52.7 N/A N/A 47.1 51.7 62.8

Signal attenuation (dB) U0 U1 U2 U3 U4 D1 D2 D3
11 May 2016 11:18:24 N/A 47.3 53.2 N/A N/A 47.1 51.5 63.0
11 May 2016 11:19:24 N/A 47.2 53.4 N/A N/A 47.1 51.5 63.0
11 May 2016 11:20:23 N/A 47.3 53.2 N/A N/A 47.1 51.5 63.0
11 May 2016 11:21:23 N/A 47.3 53.3 N/A N/A 47.1 51.5 63.0
11 May 2016 11:22:23 N/A 47.1 53.3 N/A N/A 47.1 51.5 63.0
11 May 2016 11:23:23 N/A 47.4 53.4 N/A N/A 47.1 51.5 63.0
11 May 2016 11:24:23 N/A 47.3 53.3 N/A N/A 47.1 51.5 63.0
11 May 2016 11:26:23 N/A 47.3 53.4 N/A N/A 47.1 51.5 63.0
11 May 2016 11:27:23 N/A 47.2 53.3 N/A N/A 47.1 51.5 63.0
11 May 2016 11:28:23 N/A 47.2 53.4 N/A N/A 47.1 51.5 63.0

...It couldn't possibly be that Openreach are experimenting with VDSL2 from the exchange, or that I caught a crossed wire somewhere, perhaps both? Feel free to make use of those stats what you will.
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gt94sss2

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Re: Poor ADSL2+ speed rates
« Reply #52 on: May 11, 2016, 12:34:10 PM »

Openreach are not allowed to run FTTC from the exchange- doing so would breach the UK Network Access Frequency Plan.

If you put your number in https://www.dslchecker.bt.com/ what does it say - specifically the text about jumpers under the main table?

If you had fibre before, I am guessing your cabinet is not very busy so Openreach switched off the FTTC service but left the hardware attached (i.e. if you were moving home and the new owners wanted fibre) - either that or they now plan to reallocate the port.
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sheepfarmer

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Re: Poor ADSL2+ speed rates?
« Reply #53 on: May 11, 2016, 12:50:40 PM »

Hi, I had a VDSL2 service from Plusnet before I migrated to the Phone Co-op ADSL2+ service. Putting my phone number into the BT checker won't work as it's now on an LLU circuit (MFP?), and using the address checker gave no clues to jumpers on the line.

Edit: Thing about the DP point seems to be irrelevant.
« Last Edit: May 11, 2016, 12:55:09 PM by sheepfarmer »
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gt94sss2

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Re: Poor ADSL2+ speed rates?
« Reply #54 on: May 11, 2016, 12:58:08 PM »

DP = Distribution Point (for instance a telegraph pole)

Some places such as flats may have DP's inside the buildings.
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burakkucat

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Re: Poor ADSL2+ speed rates?
« Reply #55 on: May 11, 2016, 05:20:33 PM »

The VDSL2 signal appearing on the circuit will have to be the a result of a fault -- probably contact with another VDSL2 enabled circuit.

When a G.Dmt/ADSL2/ADSL2+ circuit is converted to VDSL2, a low-pass filter will then be present between the DLSAM & the E-side cable to stop the high frequency xDSL signals travelling back towards the exchange and, more importantly, to prevent the E-side cable acting as a bridging tap across the pair.

When a VDSL2 circuit is converted to G.Dmt/ADSL2/ADSL2+ the tie-pairs to the fibre cabinet are disconnected in the PCP and a plain D-side to E-side jumper is reinstated. That step has to be performed, otherwise the G.Dmt/ADSL2/ADSL2+ signal from the exchange will be blocked by the low-pass filter in the fibre cabinet and not reach the EU.
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sheepfarmer

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Re: Poor ADSL2+ speed rates?
« Reply #56 on: May 11, 2016, 06:12:01 PM »

Thanks for the explanation burakkucat.  :cool:

BTW I'll leave the laptop running overnight for uploading stats to MWDS for anyone looking to have a peek - my current FEC error rate is around 1200-1400 per minute.
« Last Edit: May 11, 2016, 06:54:49 PM by sheepfarmer »
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sheepfarmer

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Re: Poor ADSL2+ speed rates?
« Reply #57 on: May 11, 2016, 09:40:19 PM »

I'm going to have to retire the MDWS uploads for now unfortunately, however I did the same appliance test with the interference present that I did on Sunday when there was no interference and again there was no shift in the downstream (1.3db) or upstream (13.8-14db) SNR margins. I reckon a call to my ISP to suggest a REIN problem is in due course as I can pretty much rule out something in my home causing this problem.
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sheepfarmer

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Re: Poor ADSL2+ speed rates?
« Reply #58 on: November 07, 2016, 05:03:16 PM »

It's six months since I last posted here, and in the end I've kind of given up on it as whatever is causing the SNR to drop would seem like an impossible task to trace. I did over the summer hold out that when the neighbours were on holiday that the interference would stop but alas it didn't. Also the RF environment is quite a noisy one so the 612 kHz test doesn't be that useful :(

Thanks to everyone who helped me on this thread, sadly I don't know how many people are suffering from this interference as it could be just myself and a few others on the DP or in the worst case scenario it could be everyone connected to the same cabinet as me! I'll settle with 8Mb down & 1Mb up that I currently have which is adequate.
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