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Author Topic: 12 days after 80/20 install - help please - possible line fault  (Read 53925 times)

GigabitEthernet

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #120 on: June 05, 2012, 09:52:43 AM »

Did it look like this ?? Best picture I can find atm.

No. It was much smaller and it was yellow.
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Black Sheep

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #121 on: June 05, 2012, 09:58:07 AM »

 ??? Have to admit, I don't think I've ever seen one of those that you mention then. B*Cat will probably have one in his Cattery though ?? ;)
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snadge

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #122 on: June 05, 2012, 03:05:48 PM »

what is difference between EXFO and JDSU
what is WOOOOOSHHHH!! (I heard one of the lads mention it to me when I explained about DMT Tool showing the SNR & BitLoading spectrum)

BS you should start your own BTo training academy lol  :D
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Aquiss - 900/110/16ms - TP-Link AR73

eliw

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #123 on: June 05, 2012, 03:09:27 PM »

Latest forced resync - as SNRM dropped to around 4.0 and would not move from thee for 2 days ... DS is kinda normal but out put power on US has now dropped to around 3.4 (from 4.7) which is resulting in US attainable rates of around 8mb instead of the previous 10mb..

Anyone care to comment about why the sudden drop in US ?
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snadge

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #124 on: June 05, 2012, 03:22:17 PM »

Latest forced resync - as SNRM dropped to around 4.0 and would not move from thee for 2 days ... DS is kinda normal but out put power on US has now dropped to around 3.4 (from 4.7) which is resulting in US attainable rates of around 8mb instead of the previous 10mb..

Anyone care to comment about why the sudden drop in US ?

someone better than me will reply soon.... BUT, it could be spectral shaping due to line conditions, i.e. the Dslam is detecting a build up of crosstalk and therefore reduces output power across the related pairs in an attempt to keep stability and fair speed for all??  just a guess...im not that familiar with mode of operation with FTTC
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Aquiss - 900/110/16ms - TP-Link AR73

Bald_Eagle1

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #125 on: June 05, 2012, 04:14:14 PM »


Anyone care to comment about why the sudden drop in US ?


A comparison of your before & after pbParams data may give some indication.
My DS band plan has changed slightly, quite recently, which does appear to have coincided exactly with a large increase (20dB or so) of US attenuation on the higher US band plan.

I can't use any of the higher band plan frequencies anyway due to general attenuation values, but this recent change does appear to have hit both DS & US sync speeds.

« Last Edit: June 05, 2012, 05:56:09 PM by Bald_Eagle1 »
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eliw

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #126 on: June 05, 2012, 06:52:11 PM »

Seems like att and everything else is the same .. a lot less errors today tho.
All the resyncs during the past week (I think 5) were done by myself...

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Bald_Eagle1

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #127 on: June 05, 2012, 08:24:28 PM »

I can't see anything obvious from your graphs.

Your latest resync was in the early hours though, when SNR would be at its lowest.
Things may improve (speed-wise) if you forced a resync/reboot at say between noon & 14:00.

Unfortunately, unlike ECI DSLAMs, the Huawei DSLAMS don't appear to report graphable US SNR, QLN & Hlog data, so we are unable to see if there have been any negatively impacting US changes.
(Although pbParams suggests that not much has changed).

Your SNRM tailing off & staying low still seems very much akin to what I was seeing on my connection, right up until the SSFP was replaced & the connection between the underground feed cable & DP was repaired.

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eliw

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #128 on: June 05, 2012, 10:00:51 PM »

Ok check this out now ... I have not done anything since the last resync...
Just have a look at my US SNRM ... baffling crap all this.

And how about this for a ping with Interleave turned off ! :)

Code: [Select]
Pinging bbc.com [212.58.241.131] with 32 bytes of data:
Reply from 212.58.241.131: bytes=32 time=72ms TTL=239
Reply from 212.58.241.131: bytes=32 time=75ms TTL=239
Reply from 212.58.241.131: bytes=32 time=75ms TTL=239
Reply from 212.58.241.131: bytes=32 time=75ms TTL=239

Ping statistics for 212.58.241.131:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 72ms, Maximum = 75ms, Average = 74ms

I'm turning the router and modem off and leaving them off for a good hour.
« Last Edit: June 05, 2012, 10:04:21 PM by eliw »
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Bald_Eagle1

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #129 on: June 05, 2012, 11:26:45 PM »

US Attainable Rate is back up to more or less 10Mb too.

It does seem like quite a noisy line/duff filter issue (going off my not identical, but very similar recent experience).

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eliw

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #130 on: June 05, 2012, 11:36:37 PM »

BE I have actually noticed that restarting my modem when the SNRM has rockbottomed ie - sometime around midnight is the best to achieve the highest sync rate (no clue why but empirically correct), I did it a couple of time around 1-2pm and it was 2 megs lower on average.

Anyway here are my stats just after restart (for some reason started with 4000 CRCs - which normally is the 24h count). Very entertaining watching your modem stats all day LOL

Ping to BBC back to 10ms

Can't wait till FTTP on demand...

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Bald_Eagle1

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #131 on: June 05, 2012, 11:50:09 PM »

All very strange.

Do you see much difference in your QLN & Hlog graphs depending on what time of day or night the connection resyncs or you reboot the modem etc?

These only ever change during the training phase of a resync & the data remains until the next retrain.

Noisy daytime business machinery interference, or milking machines etc. if rurally located?
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burakkucat

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #132 on: June 06, 2012, 01:47:03 AM »

??? Have to admit, I don't think I've ever seen one of those that you mention then. B*Cat will probably have one in his Cattery though ?? ;)

Attached is a poorly focused picture of a SA9083. I'll have to try to capture a better image of the one I have in my grotto (at The Cattery) via my flat-bed scanner.  :)

They definitely do not have an 8M marked at the right-hand end of the scale.  :-\

I don't recognise the description of the device in question.  :no:
« Last Edit: June 06, 2012, 01:49:52 AM by burakkucat »
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Black Sheep

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #133 on: June 06, 2012, 06:37:07 PM »

what is difference between EXFO and JDSU
what is WOOOOOSHHHH!! (I heard one of the lads mention it to me when I explained about DMT Tool showing the SNR & BitLoading spectrum)

BS you should start your own BTo training academy lol  :D

The 2 HHT's (EXFO & JDSU) are very, very similar in what they do, it's just the way in which the data/results are presented that is different. We (BT) use two different manufacturers, in order that there is no monopolising and susbsequent price-hike in spare parts.

WHOOSH is a remote monitoring tool of BT DSL circuits (Not LLU's). It is a great bit of kit, especially when diagnosing REIN faults. I would be on here all night if I was to explain all its metrics, suffice to say its probably the best tool we have to view a circuits history, and when used in conjunction with a HHT at the EU's premises. 
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Black Sheep

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Re: 12 days after 80/20 install - help please - possible line fault
« Reply #134 on: June 06, 2012, 06:38:11 PM »

Whoops, missed a bit ............ WHOOSH can not show 'bit-loading'. That has to be done in a 'live' situation, not historically.
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