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Author Topic: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4  (Read 1230 times)

snadge

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Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« on: February 01, 2019, 05:44:54 PM »

well ive just installed a BT openreach NTE 5C (Mk2) with a Mk4 SSFP and low and behold I get similar sync rates, but look at this graph?

I think bitswapping activity is higher but have not checked yet...seems like it is - all other charts look ok - whats peoples thoughts on this? - stats below
         
            Downstream   Upstream
Line attenuation (dB):     14.1      0.0
Signal attenuation (dB):   Not available on VDSL2      
Connection speed (kbps):   78714      20000
SNR margin (dB):           6.3      9.6
Power (dBm):               3.6      3.5
Interleave depth:          1      1
INP:                       0      0
G.INP:                     Not enabled      Not enabled
Vectoring status:          5 (VECT_UNCONFIGURED)      

RSCorr/RS (%):             N/A      0.0379
RSUnCorr/RS (%):           N/A      0.0000
ES/hour:                   37.4      0


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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 54,000k <-> Snr: 6dB <-> Mode: Interleaving 1570 - INP=5 - gfrom solid 79 for 9 months to this!!

ejs

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #1 on: February 01, 2019, 05:57:36 PM »

Before doing anything else, I would check the raw bitloading data to see if the graph is a correct representation.
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snadge

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #2 on: February 01, 2019, 06:03:09 PM »

Before doing anything else, I would check the raw bitloading data to see if the graph is a correct representation.

yeah done that, fresh copy of DSL-stats in a new folder just to be sure and its the same - or is the data stored and collected from within a shared folder thats hidden? (windows)
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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 54,000k <-> Snr: 6dB <-> Mode: Interleaving 1570 - INP=5 - gfrom solid 79 for 9 months to this!!

ejs

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #3 on: February 01, 2019, 06:23:54 PM »

What I meant was that I wanted to see the raw text output of the "xdslctl info --Bits" command.

In any case, considering you're getting the full upstream speed with room to spare, I don't think it really matters.
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snadge

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #4 on: February 01, 2019, 06:36:16 PM »

ah I see, here is the attached data, what could cause this?

thanks
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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 54,000k <-> Snr: 6dB <-> Mode: Interleaving 1570 - INP=5 - gfrom solid 79 for 9 months to this!!

ejs

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #5 on: February 01, 2019, 07:12:00 PM »

OK the data matches the appearance of the graph.

I have no idea what could cause this. I'm guessing that something (presumably on the receiving end, so for the upstream, in the DSLAM) has gone into some weird state and whatever it is might go back to normal on a resync or after switching the modem off for a few hours, or it's doing something special I don't know about.

It seems unlikely that any type of noise could knock out alternate tones like that.
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snadge

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #6 on: February 01, 2019, 08:46:12 PM »

hmm.. as you know the only changes where swapping out an NTE5A for the newer NTE5Cmk2 - presumably something in the SSFP or NTE circuitry

the graph has sorted itself out - although it's a bit early to say it looks like CRC's and SwapsPerMin have been quite active, SPM has gone from an average of 12 to 35 (300% increase)

lots of swapping on upstream which wasnt normal?

thunder storms are brewing now lol


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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 54,000k <-> Snr: 6dB <-> Mode: Interleaving 1570 - INP=5 - gfrom solid 79 for 9 months to this!!

snadge

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #7 on: February 01, 2019, 09:03:32 PM »

CRC is up by 10x, the last 9 days averaged 30 per hour, the last 4 hours averaged 300 per hour
...time to switch back maybe?
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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 54,000k <-> Snr: 6dB <-> Mode: Interleaving 1570 - INP=5 - gfrom solid 79 for 9 months to this!!

burakkucat

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #8 on: February 01, 2019, 09:25:44 PM »

Granted that "those who know" dislike the NTE5C in terms of it construction and functionality but there is nothing that would account for the abnormal US bands you showed earlier.

I have to ask the question: If you did not examine the statistics and plots, would you have been aware of the abnormality from normal usage of the circuit?  :-\
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snadge

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #9 on: February 01, 2019, 09:34:21 PM »

Granted that "those who know" dislike the NTE5C in terms of it construction and functionality but there is nothing that would account for the abnormal US bands you showed earlier.

I have to ask the question: If you did not examine the statistics and plots, would you have been aware of the abnormality from normal usage of the circuit?  :-\

SHAKES HEAD  :lol:

was gunna swap back before DLM took charge and noticed I somehow managed to get the A and B wires in the wrong way...sigh!  best leave it for the experts lol....   yeah I would have spotted the increase most very likely as the AVERAGES page stuck out like a sore thumb.

on the correct polarity... I get a much lower yield....however, there was an approx 0.5db increase in noise before we went down, now:

Code: [Select]
Line attenuation (dB):  14.1 0.0
Signal attenuation (dB): Not available on VDSL2
Connection speed (kbps): 77249 20000
SNR margin (dB):        6.3 9.2
Power (dBm):            3.8 3.7
Interleave depth:        1 1
INP:                    0 0
G.INP:                  Not enabled Not enabled
Vectoring status:        5 (VECT_UNCONFIGURED)

RSCorr/RS (%):          N/A 0.0000
RSUnCorr/RS (%):        N/A 0.0000
ES/hour:                37.6 0.97

think I'm just gunna pop the old gear back in and cal it a day - been tested to bits and the best connection was on an old NTE5A with a dongle filter on the flat cable lol..... I will do it late tonight or morning when line is quietest and pop that NTE5C in the drawer.
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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 54,000k <-> Snr: 6dB <-> Mode: Interleaving 1570 - INP=5 - gfrom solid 79 for 9 months to this!!

burakkucat

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #10 on: February 01, 2019, 09:45:58 PM »

b*cat smiles, enigmatically.  :)

. . . noticed I somehow managed to get the A and B wires in the wrong way...sigh!  best leave it for the experts lol....

The polarity is irrelevant both for telephony and the broadband service. (The latter is just low power radio frequency transmission over a metallic pathway. Which is high frequency AC.  ;)  )

The perfectionist kitteh would set his DMM to DC volts and connect the positive probe to a good earth. The negative probe would be applied to each wire of the pair . . . the wire showing the greater voltage is the B-wire, the wire showing the lesser voltage is the A-wire.
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snadge

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #11 on: February 01, 2019, 10:08:11 PM »

b*cat smiles, enigmatically.  :)

The polarity is irrelevant both for telephony and the broadband service. (The latter is just low power radio frequency transmission over a metallic pathway. Which is high frequency AC.  ;)  )

The perfectionist kitteh would set his DMM to DC volts and connect the positive probe to a good earth. The negative probe would be applied to each wire of the pair . . . the wire showing the greater voltage is the B-wire, the wire showing the lesser voltage is the A-wire.

ahh sounds familiar actually, now you mention it (polarity) ..my mind is stale on the subject as I've been away from it for eons  :) - that sounds like an Invitation B'Kat he!  ;) - I just so happen to have a Digital MM in my bedroom somewhere, I will go and fish it out - nice to know..be even better not too forget hehe :)
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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 54,000k <-> Snr: 6dB <-> Mode: Interleaving 1570 - INP=5 - gfrom solid 79 for 9 months to this!!

snadge

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #12 on: February 02, 2019, 12:52:04 AM »

I couldn't get the MM working, broke... put the old setup back and back to 78.5 and all stats back to normal - boohooo to NTE5C+SSFPmk4, it seems I can't claw back that last bit as I have had it at 79.9 before
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Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 54,000k <-> Snr: 6dB <-> Mode: Interleaving 1570 - INP=5 - gfrom solid 79 for 9 months to this!!

burakkucat

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #13 on: February 02, 2019, 01:26:06 AM »

Does that 1.4 Mbps really matter to your usage of the circuit? I suggest not.

But it would, to me. For this is what I use --

[bcat ~]$ speedtest-cli --simple
Ping: 57.15 ms
Download: 4.20 Mbit/s
Upload: 1.05 Mbit/s
[bcat ~]$
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snadge

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Re: Strange Upstream SNR/Bit-Loading graph on NTE5C Mk2 + SSFP Mk4
« Reply #14 on: February 02, 2019, 01:57:15 AM »

Does that 1.4 Mbps really matter to your usage of the circuit? I suggest not.

But it would, to me. For this is what I use --

[bcat ~]$ speedtest-cli --simple
Ping: 57.15 ms
Download: 4.20 Mbit/s
Upload: 1.05 Mbit/s
[bcat ~]$


kinda do feel bad when I see that - ouch!  taken for granted such speeds nowadays
Logged
Zyxel VMG8924-B10A <-> PlusNET <-> Eci DSLAM
Sync: 54,000k <-> Snr: 6dB <-> Mode: Interleaving 1570 - INP=5 - gfrom solid 79 for 9 months to this!!