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Author Topic: Badly hit by crosstalk  (Read 5774 times)

adslmax

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Badly hit by crosstalk
« on: May 14, 2019, 12:09:04 AM »

The line has suddenly resync by DLM caused my FTTC drop from 80/20 to 59/20 after nasty SNR drop to -0.5dB at 17:43. Probably down to crosstalk. But it went back to 80/20 after a short second. Probably installed a new line port due to my cabinet are in the waiting list this morning changed by follow that page.



« Last Edit: May 14, 2019, 12:16:32 AM by adslmax »
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adslmax

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Re: Badly hit by crosstalk
« Reply #1 on: May 14, 2019, 12:13:18 AM »

Old FTTC modem stats 6th May
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re0

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Re: Badly hit by crosstalk
« Reply #2 on: May 14, 2019, 12:20:47 AM »

That is certainly a nasty drop there. I don't think I've had a personal experience with the SNR dropping into negative figures on FTTC - except for when I had a Lantiq device in use. :D

Just keep an eye on it but it might just be a one-off. The DLM will play since it's not impacting your stats now. :)
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adslmax

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Re: Badly hit by crosstalk
« Reply #3 on: May 14, 2019, 12:52:15 AM »

There been one single of 85 errored secs at 17:43 in one go!

Scary!

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burakkucat

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Re: Badly hit by crosstalk
« Reply #4 on: May 14, 2019, 12:58:57 AM »

That really does look like a disturbance to the circuit, caused by work in the cabinet. I suspect the DLM will quite happily ignore that one event. And if you were not monitoring the statistics, you might not have even noticed the temporary degradation of the circuit's performance.
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re0

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Re: Badly hit by crosstalk
« Reply #5 on: May 14, 2019, 01:02:07 AM »

It may be scary, but nothing too worrying right now. I remember an old ADSL fault there once was, and ES would be quadruple figures on the downstream for quite a few hours during the day. Seeing massive red bars from DSLstats was scary! The connection seldom dropped since the SNR was around the target, but it was just unusable due to the sheer amount of CRCs.
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adslmax

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Re: Badly hit by crosstalk
« Reply #6 on: May 14, 2019, 01:02:53 AM »

Yes as the line was stable for 68 days until big bang with massive drop in SNR below 0.0dB never seen that in any FTTC. I guess you are correct burakkucat as DLM will ignore that one!
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kitz

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Re: Badly hit by crosstalk
« Reply #7 on: May 14, 2019, 01:11:41 AM »

That really does look like a disturbance to the circuit, caused by work in the cabinet. I suspect the DLM will quite happily ignore that one event. And if you were not monitoring the statistics, you might not have even noticed the temporary degradation of the circuit's performance.

I would tend to agree with everything said above.   
It's back to normal now - thankfully :)
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adslmax

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Re: Badly hit by crosstalk
« Reply #8 on: May 14, 2019, 01:16:08 AM »

Just been checked roadwork. There is work ongoing at my cabinet pcp 8

Information for Operational Teams
Highway Authority:    Telford and Wrekin Borough Council
Location:    S/O 74 WILLOWFIELD TELFORD TF7 5NT (cabinet 8)
Description:    Excavation to expose and repair buried telecoms plant in the footway.
Permit status:    Permit Granted
Works ref:    BC005DL1W00000IBZ2HHPJ01
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aesmith

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Re: Badly hit by crosstalk
« Reply #9 on: May 14, 2019, 11:47:44 AM »

There been one single of 85 errored secs at 17:43 in one go!
Scary!
85 in an hour isn't really much in terms of actual impact, other than what it might cause DLM to do.  I found no detectable slow down even with 70 CRC per minute (around 2800 ES per hour).
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adslmax

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Re: Badly hit by crosstalk
« Reply #10 on: May 14, 2019, 11:49:39 AM »

There seem five openreach engineers are working at the cabinet footpath at the moment (don't know what they are doing?)
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CarlT

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Re: Badly hit by crosstalk
« Reply #11 on: May 14, 2019, 03:06:25 PM »

Switch the monitoring off, leave the engineers alone and enjoy the Internet - they're fixing a fault as your Roadworks copy/paste says  :P

Quote
Description:    Excavation to expose and repair buried telecoms plant in the footway.

Digging to get to ducting, breaking ducting open, finding broken cable, splicing in new cable / moving services to unbroken and unused pairs in the existing cable.
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adslmax

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Re: Badly hit by crosstalk
« Reply #12 on: May 14, 2019, 04:02:20 PM »

The engineer told me off to stay away and no camera photo taken please by the BT footpath and cabinet!  ??? >:( It's a free country anyway.

Line been resync this lunchtime drop 80 to 62  :( :(

Thank alots DLM :( now been banded capped at 62Meg

Code: [Select]
Stats recorded 14 May 2019 16:03:49

DSLAM type / SW version: BDCM:0xa48c (164.140) / v0xa48c
Modem/router firmware:  AnnexA version - A2pv6F039g1.d24m
DSL mode:                VDSL2 Profile 17a
Status:                  Showtime
Uptime:                  2 hours 19 min 59 sec
Resyncs:                1 (since 14 May 2019 13:23:45)

Downstream Upstream
Line attenuation (dB):  12.7 0.0
Signal attenuation (dB): Not available on VDSL2
Connection speed (kbps): 62999 19999
SNR margin (dB):        5.3 9.3
Power (dBm):            12.5 0.7
Interleave depth:        16 1
INP:                    48.00 0
G.INP:                  Enabled Not enabled
Vectoring status:        5 (VECT_UNCONFIGURED)

Last Retrain Reason:    1
Last initialization procedure status:   0
Max:    Upstream rate = 26875 Kbps, Downstream rate = 62778 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 62999 Kbps

I checked my DSL Checker as handback now at 62.6 matched my sync rate 62Meg :(
« Last Edit: May 14, 2019, 04:12:43 PM by adslmax »
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re0

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Re: Badly hit by crosstalk
« Reply #13 on: May 14, 2019, 04:26:29 PM »

The engineer told me off to stay away and no camera photo taken please by the BT footpath and cabinet!  ??? >:( It's a free country anyway.
Bit unfair of them, if you were on public property. It's easier to just honour their request, however.

Line been resync this lunchtime drop 80 to 62  :( :(

Thank alots DLM :( now been banded capped at 62Meg
SNRM looks a bit too low to be only banded? Anyway, just wait for them to finish their works before acting upon this.
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adslmax

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Re: Badly hit by crosstalk
« Reply #14 on: May 14, 2019, 04:37:41 PM »

SNRM looks a bit too low to be only banded? Anyway, just wait for them to finish their works before acting upon this.

SNR went crazy today all over the place from 2dB to 7dB
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