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Author Topic: High QLN & Other Issues.  (Read 20383 times)

notaclue

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High QLN & Other Issues.
« on: July 19, 2014, 03:32:26 PM »

As a follow up to this post here: http://forum.kitz.co.uk/index.php?topic=14183.msg266556#msg266556

I've recently re-synced with the exchange at a much lower speed than normal. I used to get 18/2.
Here are my current stats.
Code: [Select]
Stats recorded 19 Jul 2014 15:28:05

DSLAM/MSAN type:           Not reported by modem
Modem/router firmware:     AnnexA version - A2pD030g.d22j
DSL mode:                  ADSL2+
Status:                    Showtime
Uptime:                    7 min 11 sec
Resyncs:                   0 (since 19 Jul 2014 13:42:24)
         
            Downstream   Upstream
Line attenuation (dB):     28.0      32.8
Signal attenuation (dB):   28.0      33.4
Connection speed (kbps):   5392      339
SNR margin (dB):           12.4      8.2
Power (dBm):               0.0      12.8
Interleave depth:          32      1
INP:                       1.05      0.60

RSCorr/RS (%):             0.1194      0.0307
RSUnCorr/RS (%):           0.0049      0.0000
ES/hour:                   0      0.47


I would like to note a couple of strange things. It's not reporting the dslam/msan current where it has before. I believe it started with an I.
Also my attenuation seems to change (Which from what I read is impossible?) Here is the log from today

Code: [Select]
         Down   Up

19 Jul 2014 13:42:30   28.0   35.6
19 Jul 2014 13:45:05   28.0   35.9
19 Jul 2014 13:49:05   28.0   35.0
19 Jul 2014 14:06:05   28.0   35.2
19 Jul 2014 14:14:06   10.5   4.9
19 Jul 2014 14:34:05   10.5   5.0
19 Jul 2014 14:37:05   28.0   34.8
19 Jul 2014 15:21:05   28.0   32.8


If anyone wants any specific graph or any other information I will gladly oblige.

It just re-synced after I posted this message. Here's the connection information with a lower attenuation

Code: [Select]
Stats recorded 19 Jul 2014 15:40:05

DSLAM/MSAN type:           Not reported by modem
Modem/router firmware:     AnnexA version - A2pD030g.d22j
DSL mode:                  ADSL2+
Status:                    Showtime
Uptime:                    3 min 47 sec
Resyncs:                   0 (since 19 Jul 2014 13:42:24)
         
            Downstream   Upstream
Line attenuation (dB):     10.5      4.9
Signal attenuation (dB):   10.5      4.8
Connection speed (kbps):   15975      1268
SNR margin (dB):           12.0      6.5
Power (dBm):               0.0      11.9
Interleave depth:          192      1
INP:                       1.06      0

RSCorr/RS (%):             0.0000      N/A
RSUnCorr/RS (%):           0.0000      N/A
ES/hour:                   0      0.60


My QLN is exactly the same as in the previous topic though...
« Last Edit: July 19, 2014, 04:29:27 PM by roseway »
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konrado5

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Re: High QLN & Other Issues.
« Reply #1 on: July 19, 2014, 04:26:09 PM »

So high attenuation changes indicate serious line fault. Could you attach your Hlog and SNR margin graphs?

Best regards
konrado5
« Last Edit: July 19, 2014, 04:28:44 PM by konrado5 »
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notaclue

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Re: High QLN & Other Issues.
« Reply #2 on: July 19, 2014, 04:32:03 PM »

Sure here is a couple. Ones from last night the other right now.

Here are your SNR graphs too.
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roseway

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Re: High QLN & Other Issues.
« Reply #3 on: July 19, 2014, 04:39:28 PM »

I hope you don't mind, but I've replaced your quote tags with code tags, which preserve the formatting better.

It certainly looks like a line fault. I note that you previously had 2 Mbps upstream speed. Do you have an annex M connection?

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  Eric

notaclue

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Re: High QLN & Other Issues.
« Reply #4 on: July 19, 2014, 04:46:52 PM »

I hope you don't mind, but I've replaced your quote tags with code tags, which preserve the formatting better.

It certainly looks like a line fault. I note that you previously had 2 Mbps upstream speed. Do you have an annex M connection?

I was unsure myself to use code or quote tags, I will keep that in mind when I post future statistics!

I can enable annex M from my router and it has been enabled/disabled.(Seems to make 0 difference to my attenuation or stability.) I'm honestly not that bothered about the speed I would like to return to my fast path profile, but as I understand it that wont happen until I get a stable connection which it seems to be able to do for the past few weeks. (Sorry if what I've typed is incoherent.)

As for a line fault, I should be able to hear this on a quiet line test? I have done several over the past few weeks and it can either be quiet or I get the odd crackle or pop. (One time I heard extremely faint voices and immediately reported it to BT, who said there was nothing wrong.)
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burakkucat

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Re: High QLN & Other Issues.
« Reply #5 on: July 19, 2014, 04:53:35 PM »

It's not reporting the dslam/msan current where it has before. I believe it started with an I.

Was it possibly Infineon:-\
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notaclue

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Re: High QLN & Other Issues.
« Reply #6 on: July 19, 2014, 04:58:09 PM »

It's not reporting the dslam/msan current where it has before. I believe it started with an I.

Was it possibly Infineon:-\

IFNS or something which I believe is Infineon. It was curious to me as last night it reported it as now it won't. :S

I've just re-synced again at a lower speed (I've also done a QLT and this time there is a constant crackle that wont abate.)
Here's the full telnet stats rather than just the stats page.
Code: [Select]
adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 8000
Max:    Upstream rate = 652 Kbps, Downstream rate = 2948 Kbps
Path:   0, Upstream rate = 322 Kbps, Downstream rate = 2867 Kbps

Link Power State:       L0
Mode:                   ADSL2+
TPS-TC:                 ATM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        11.5            12.9
Attn(dB):        22.0            7.3
Pwr(dBm):        0.0             13.0
                        ADSL2 framing
MSGc:           60              11
B:              87              14
M:              2               16
T:              1               3
R:              16              10
S:              1.9418          23.2558
L:              791             86
D:              16              1
                        Counters
SF:             19533           16890
SFErr:          0               15
RS:             644532          53836
RSCorr:         467             16
RSUnCorr:       0               0

HEC:            5               8
OCD:            0               0
LCD:            0               0
Total Cells:    2116217         235322
Data Cells:     4036            2762
Drop Cells:     0
Bit Errors:     0               848

ES:             359             250
SES:            191             5
UAS:            633             633
AS:             313

INP:            1.29            0.46
PER:            16.02           18.53
delay:          7.76            5.81
OR:             32.95           7.33

Bitswap:        0               0

Total time = 2 hours 43 min 12 sec
FEC:            134924          4739
CRC:            8569            680
ES:             359             250
SES:            191             5
UAS:            633             633
LOS:            18              0
LOF:            160             0
Latest 15 minutes time = 13 min 12 sec
FEC:            5598            461
CRC:            1200            42
ES:             58              18
SES:            43              0
UAS:            162             162
LOS:            4               0
LOF:            36              0
Previous 15 minutes time = 15 min 0 sec
FEC:            10787           1728
CRC:            2446            157
ES:             72              33
SES:            52              2
UAS:            148             148
LOS:            5               0
LOF:            44              0
Latest 1 day time = 2 hours 43 min 12 sec
FEC:            134924          4739
CRC:            8569            680
ES:             359             250
SES:            191             5
UAS:            633             633
LOS:            18              0
LOF:            160             0
Previous 1 day time = 0 sec
FEC:            0               0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Since Link time = 5 min 13 sec
FEC:            467             16
CRC:            0               15
ES:             0               6
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
 >


I very much appreciate the help I have received.

As a side note, could this possibly be the symptoms of my router giving up the ghost? I've ordered a new one just to be sure. (It is DSLstats compatible I believe.)
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boost

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Re: High QLN & Other Issues.
« Reply #7 on: July 19, 2014, 06:07:28 PM »

Does the QLT without the modem attached to the line sound any different?

What are the chances your pair is flapping in the wind between your house and the PCP? :D
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notaclue

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Re: High QLN & Other Issues.
« Reply #8 on: July 19, 2014, 06:20:45 PM »

Does the QLT without the modem attached to the line sound any different?

What are the chances your pair is flapping in the wind between your house and the PCP? :D

The QLT is done with a corded phone straight into the test socket, nothing else connected.

(PCP = Telephone pole?) I expect that to happen, but a sudden large degradation of quality I do not :(
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boost

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Re: High QLN & Other Issues.
« Reply #9 on: July 19, 2014, 06:28:47 PM »

The green box thing (Primary Connection Point?) or whatever the immediate ish termination points are from your house to the cab.

I saw a line gain (improve) by 9dB DS attenuation the other day when OR merely re-affirmed the connection at the cab. He said he did nothing at first until I mentioned the huge line improvement...
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notaclue

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Re: High QLN & Other Issues.
« Reply #10 on: July 19, 2014, 06:36:56 PM »

Do all lines no matter the distance from the exchange to go a PCP?
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roseway

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Re: High QLN & Other Issues.
« Reply #11 on: July 19, 2014, 06:40:42 PM »

Quote
(I've also done a QLT and this time there is a constant crackle that wont abate.)

If that's done without any other equipment connected, then it's almost certainly an intermittent line fault. To be certain you ought to remove the NTE5 faceplate and plug the telephone into the test socket. This would remove the possibility of any internal wiring affecting the result. The next thing will be to report the problem to your ISP, but make sure that you collect plenty of data first.

Quote
Do all lines no matter the distance from the exchange to go a PCP?

Most do, but a smallish proportion are connected directly to the exchange.
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notaclue

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Re: High QLN & Other Issues.
« Reply #12 on: July 19, 2014, 06:47:26 PM »

Quote
(I've also done a QLT and this time there is a constant crackle that wont abate.)

If that's done without any other equipment connected, then it's almost certainly an intermittent line fault. To be certain you ought to remove the NTE5 faceplate and plug the telephone into the test socket. This would remove the possibility of any internal wiring affecting the result. The next thing will be to report the problem to your ISP, but make sure that you collect plenty of data first.

Quote
Do all lines no matter the distance from the exchange to go a PCP?

Most do, but a smallish proportion are connected directly to the exchange.

All the equipment is plugged into the test socket. (The faceplate has never been installed. and all QLT tests are done with the corded phone plugged into the test socket without any filters)
What data should I collect? Should I perhaps post on the BT community forums?

I think my line goes directly to the exchange is there anyway I can dis/prove this?
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konrado5

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Re: High QLN & Other Issues.
« Reply #13 on: July 19, 2014, 06:58:00 PM »

I'm curious what type of fault causes such Hlog, SNR margin fluctuations, attenuation fluctuations.
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roseway

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Re: High QLN & Other Issues.
« Reply #14 on: July 19, 2014, 07:26:11 PM »

Quote
I think my line goes directly to the exchange is there anyway I can dis/prove this?

If you select the 'Address checker' option here: https://www.btwholesale.com/includes/adsl/main.html , one of the pices of information it provides is which cabinet you're connected to (or not).
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