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Author Topic: Slow upload connection speed on Infinity  (Read 482 times)

IcedKiwi

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Slow upload connection speed on Infinity
« on: August 14, 2019, 10:07:12 AM »

Hi All,

Anyone able to help shed some light on what may be causing my upload speed to be ~half of what it should/used to be?

When I first moved into the house, I used to get 17-18Mbps upload speed but for the past month or so,  it seems to have halved. I've got an unlocked HG612 modem and pulled the following stats. From my limited knowledge, the SNRM and attenuation seem pretty good. But do have interleave depth of 125 and INP 2.5.
Quiet line check seems OK, but only got cordless phones. Additionally the house doesn't seem to have a master socket, just all blank single faceplates. House was built in 2012 and guess it's been self installs since. I do have a filter in line. Don't notice any drop outs and modem is continuously on etc.

Haven't contacted BT yet, but thought I'd come here to see if anyone sees anything obvious or has ideas.
Unfortunately I haven't been monitoring stats continuously, so don't have much data at the moment to fall back on. But the BT dslchecker says I should expect 20-19 Mbps clean & impacted, but max observed speed of 10.13 on 2019-07-01

Thanks

Code: [Select]
DSLAM type / SW version: IFTN:0xb206 (178.6) / v0xb206
Modem/router firmware:  AnnexA version - A2pv6C038m.d24j
DSL mode:                VDSL2 Profile 17a
Status:                  Showtime
Uptime:                  1 day 19 hours 4 min 52 sec
Resyncs:                0 (since 13 Aug 2019 10:19:45)

Downstream Upstream
Line attenuation (dB):  10.6 0.0
Signal attenuation (dB): Not monitored
Connection speed (kbps): 70879 9907
SNR margin (dB):        6.3 6.1
Power (dBm):            -4.4 -4.4
Interleave depth:        1 125
INP:                    0 2.50
G.INP:                  Not enabled Not enabled
Vectoring status:        5 (VECT_UNCONFIGURED)

RSCorr/RS (%):          N/A 10.3051
RSUnCorr/RS (%):        N/A 0.0000
ES/hour:                2.19 0.07
Code: [Select]
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 9941 Kbps, Downstream rate = 71112 Kbps
Bearer: 0, Upstream rate = 9907 Kbps, Downstream rate = 70879 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): 6.3 6.2
Attn(dB): 10.6 0.0
Pwr(dBm): -4.4 -4.4

Bearer 0
INP: 0.00 2.50
INPRein: 0.00 0.00
delay: 0 8
PER: 1.78 11.41
OR: 107.55 21.03
AgR: 70986.70 9927.88


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kitz

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Re: Slow upload connection speed on Infinity
« Reply #1 on: August 14, 2019, 03:28:35 PM »

Quote
From my limited knowledge, the SNRM and attenuation seem pretty good.

The downstream is, but the upstream doesn't have any spare SNRM to allow you to sync at a higher rate.
A downstream line atten of 10.6 should give you sufficient for the upstream to get the full 20Mbps.

Interleave depth of 125 seems high yet INP is 2.5 with delay of 8 which is ok but indicates that there has been noise on the line.

Not quite sure what to make of that QLN graph and the steep dip at ~2150...  or more rather the surrounding increases.  QLN usually shows cross talk but that V is sharper than the usual broader spread more typical of crosstalk.   
 
There does appear to be something strange in U2.   Can you post your HLog and Bitloading graphs please.
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burakkucat

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Re: Slow upload connection speed on Infinity
« Reply #2 on: August 14, 2019, 06:36:26 PM »

Not quite sure what to make of that QLN graph and the steep dip at ~2150...  or more rather the surrounding increases.

<snip>
 
There does appear to be something strange in U2.   Can you post your HLog and Bitloading graphs please.

There certainly is something odd occurring in the US2 band. I don't recall ever seeing a QLN plot with a similar shape.  ???
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d2d4j

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Re: Slow upload connection speed on Infinity
« Reply #3 on: August 14, 2019, 07:11:58 PM »

Hi

I could be wrong, and as there is no master nte in place then I suspect something has been plugged into one of phone sockets

I would go around the house and unplug all things plugged into any/all of phone outlets (including dect phones)

Turn off hg612 - leave 30 minutes (unless you don’t want to and risk dlm intervention)

Change the filter for a new one (if you have one)

Turn hg612 on

Check stats from hg612

It may not make any difference but should help by excluding any devices in the line bring it down

Many thanks

John
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IcedKiwi

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Re: Slow upload connection speed on Infinity
« Reply #4 on: August 14, 2019, 07:38:11 PM »

Thanks All,
HLog and Bitloading graphs below to see if they shed any extra light

Hi
I could be wrong, and as there is no master nte in place then I suspect something has been plugged into one of phone sockets
I would go around the house and unplug all things plugged into any/all of phone outlets (including dect phones)
Turn off hg612 - leave 30 minutes (unless you don’t want to and risk dlm intervention)
Change the filter for a new one (if you have one)
Turn hg612 on
Check stats from hg612
It may not make any difference but should help by excluding any devices in the line bring it down
Many thanks
John

You could be on to something.. DECT phone is plugged in upstairs into another socket, and I think just directly into the socket and not a filter if that makes a difference. Modem is downstairs and with a filter. Will give it a shot unplugging and seeing if it makes a difference.
To confirm correct strategy:
  • Filter everything?
  • Filter only phones?
  • Filter only modem?


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fat jez

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Re: Slow upload connection speed on Infinity
« Reply #5 on: August 14, 2019, 07:48:40 PM »

filter everything that has something plugged into it.
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IcedKiwi

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Re: Slow upload connection speed on Infinity
« Reply #6 on: August 14, 2019, 07:52:42 PM »

filter everything that has something plugged into it.
Thanks for confirming it's user error! Hopefully get it sorted once filtering the phone again. Will keep posted
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d2d4j

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Re: Slow upload connection speed on Infinity
« Reply #7 on: August 14, 2019, 08:26:33 PM »

Hi

I would unplug everything leaving just the hg612 plugged into a new filter

Then test to see if it makes any difference

If it does, when plugging all devices back in (using a filter), does it lower the base test above.

If it does, unplug all devices and singular plug each device back in and test as you go, until you find the device causing the loss

Many thanks

John
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IcedKiwi

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Re: Slow upload connection speed on Infinity
« Reply #8 on: August 14, 2019, 08:40:58 PM »

Hi
I would unplug everything leaving just the hg612 plugged into a new filter
Then test to see if it makes any difference
If it does, when plugging all devices back in (using a filter), does it lower the base test above.
If it does, unplug all devices and singular plug each device back in and test as you go, until you find the device causing the loss
Many thanks
John
Thanks John, will order a couple of new filters and then start looking at my base and any impact of the other stuff plugged in with filters.
Cheers,
Scott
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IcedKiwi

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Re: Slow upload connection speed on Infinity
« Reply #9 on: August 14, 2019, 08:53:23 PM »

In my impatience, I pulled the phone out and now just got the HG612 with the existing filter.
Didn't disconnect the modem for the 30 minutes which therefore trigger a retrain by the looks of it.
Instant speed boost on the upstream so think we've tracked down the main issue and now just got to optimise...
Thanks all - Will keep posted
Code: [Select]
xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 16578 Kbps, Downstream rate = 71736 Kbps
Bearer: 0, Upstream rate = 16631 Kbps, Downstream rate = 71739 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): 6.3 6.1
Attn(dB): 9.7 0.0
Pwr(dBm): -5.0 -5.0
VDSL2 framing
Bearer 0
MSGc: 18 14
B: 239 79
M: 1 1
T: 22 43
R: 0 16
S: 0.1065 0.1531
L: 18032 5016
D: 1 209
I: 240 96
N: 240 96
Counters
Bearer 0
OHF: 1057412 283373
OHFErr: 0 0
RS: 0 1483056
RSCorr: 0 1060
RSUnCorr: 0 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 257149478 0
Data Cells: 91341082 0
Drop Cells: 0
Bit Errors: 0 0

ES: 138 7
SES: 30 0
UAS: 74 52
AS: 1866

Bearer 0
INP: 0.00 2.50
INPRein: 0.00 0.00
delay: 0 8
PER: 1.76 6.60
OR: 108.85 24.20
AgR: 71847.34 16654.94

Bitswap: 0/0 92/92

Total time = 1 days 5 hours 51 min 18 sec
FEC: 0 151461
CRC: 16943 14
ES: 138 7
SES: 30 0
UAS: 74 52
LOS: 1 0
LOF: 9 0
LOM: 6 0
Latest 15 minutes time = 6 min 18 sec
FEC: 0 287
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: 0 365
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 = 5 hours 51 min 18 sec
FEC: 0 10338
CRC: 12126 6
ES: 29 3
SES: 22 0
UAS: 48 26
LOS: 1 0
LOF: 9 0
LOM: 6 0
Previous 1 day time = 24 hours 0 sec
FEC: 0 39756
CRC: 125 1
ES: 38 1
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 31 min 5 sec
FEC: 0 1060
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
#
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d2d4j

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Re: Slow upload connection speed on Infinity
« Reply #10 on: August 14, 2019, 08:59:54 PM »

Hi

Excellent news

Login to the hg612 and turn off QoS. This should give you upto 18.5 up

Many thanks

John
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burakkucat

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Re: Slow upload connection speed on Infinity
« Reply #11 on: August 14, 2019, 10:05:48 PM »

Your Hlog plot shows the presence of that unfiltered telephone (as a bridging-tap). That was your problem.  :)

Don't force a circuit re-train but just wait for one to occur and then look at the new Hlog plot. Compare it with the one you have shown in "Reply #4" and all will become apparent.

You say the property was a 2012 new build . . . I wonder if an XNTE had been fitted by the builder, including all wiring into the property. I realise that the XNTE was discontinued as of November 2011 but perhaps the builder had already been issued with XNTEs for the development under the NewSites scheme. (The XNTE is currently documented in BT SIN 470, Issue 3.0, April 2018.) Please take a look outside your property and see if you have such a unit fitted.

There is a distinct possibility that the builder wired all the internal sockets in a star fashion (or multi-star fashion) rather than the preferred daisy-chain. That would account for the bridging-tap defect noted in the Hlog plot (shown in "Reply #4").

Quote from: BT SIN 470
2. Service Outline
2.1 General

Openreach does not install External NTE’s anymore even at residential new build
developments to terminate the copper pair. This SIN provides details relevant to CPs
regarding External NTEs.
BT reserves the right at its absolute discretion to elect whether or not to install an External
NTE.

2.2 Service Availability
The External NTE (XNTE) was used on NewSites developments since 2007. Due to being
incompatible with FTTC and FTTP it is now withdrawn however some current XNTEs may
remain in situ until faulty or vistited by an engineer. When visited the internal NTE5C must
be fitted instead by converting the first extension socket served after the XNTE which now
needs to be re-wired as the new “Mastersocket” using an NTE5C. This is easily done by
bypassing crimping through within the XNTE and terminating the cable from the XNTE to
the NTE5 backplate and terminating all further extensions to the NTE5 frontplate.

3. Ceasing usage
From November 2011 the External NTE will no longer be provided at NewSites. Housing
developers will instead install an internal NTE5. All existing External NTEs will remain in
place until faulty or removed if an End User changes to an incompatible service.

If all my above postulations are true, you will ideally require the services of an Openreach technician to:
  • By-pass the components in the XNTE.
  • Fit a new NTE5 within your property.
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kitz

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Re: Slow upload connection speed on Infinity
« Reply #12 on: August 14, 2019, 11:59:39 PM »

Quote
Your Hlog plot shows the presence of that unfiltered telephone (as a bridging-tap).
Yup agreed.  Hlog shows bridge tap symptoms...  which is turn is reflected in the bitloading graph .
Faulty filters are usually one of the most common causes which will cause problems with the upstream.

Quote
I could be wrong, and as there is no master nte in place then I suspect something has been plugged into one of phone sockets

Good spot John.

As b*cat says it would be interesting to see the new hlog
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