Kitz Forum

Broadband Related => ADSL Issues => Topic started by: konrado5 on April 03, 2014, 06:23:22 PM

Title: Stable connection despire very low SNR margin-puzzle
Post by: konrado5 on April 03, 2014, 06:23:22 PM
From 5 days I have SNR margin 0.4-0.9 dB because I have tweaked my SNR margin. I am surprised I haven't got any disconnections and not very much CRC errors and ES on fast path without Impulse Noise Protection. I have about 100-200 errored seconds and slight more CRC errors. How is it possible?

Best regards
konrado5
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: konrado5 on April 03, 2014, 06:28:32 PM
Followint there are CRC graphs.
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: konrado5 on April 03, 2014, 09:47:32 PM
My SNR margin has just raised to 1.1 dB.
Code: [Select]
adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 8000
Max:    Upstream rate = 1244 Kbps, Downstream rate = 20560 Kbps
Path:   0, Upstream rate = 1233 Kbps, Downstream rate = 17835 Kbps

Link Power State:       L0
Mode:                   ADSL2+
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):       1.2             6.8
Attn(dB):       24.5            14.6
Pwr(dBm):       18.5            12.2
                        ADSL2 framing
MSGc:           51              16
B:              211             37
M:              1               1
T:              3               3
R:              0               0
S:              0.3797          0.9774
L:              4466            311
D:              1               1
                        Counters
SF:             31394831                395195
SFErr:          14907           0
RS:             0               0
RSCorr:         0               0
RSUnCorr:       0               0

HEC:            6391            0
OCD:            194             0
LCD:            0               0
Total Cells:    4260441931              2782487094
Data Cells:     219127906               256798841
Drop Cells:     0
Bit Errors:     0               10403

ES:             14413           184
SES:            1               0
UAS:            107             785
AS:             509690

INP:            0.00            0.00
PER:            16.23           16.12
delay:          0.09            0.24
OR:             28.08           10.91

Bitswap:        121176          21
Best regards
konrado5
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: burakkucat on April 03, 2014, 10:34:39 PM
There is very little to be said . . . other than "Thank you for showing us the graphs."

You are clearly blessed with a very stable circuit.  :)  I don't think anyone in the UK would be able to use a broadband circuit with the target SNRM set as low as 1 dB.  :-\
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: konrado5 on April 03, 2014, 10:39:54 PM
It is surprising it is such stable despire poor Hlog.
Best regards
konrado5
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: konrado5 on April 04, 2014, 08:46:05 PM
I've just tweaked my SNR margin slight more and I have 0.0-0.1 dB and about 1000 ES per hour.

Best regards
konrado5
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: konrado5 on April 05, 2014, 01:54:51 PM
BER test at SNR margin 0.1 dB:
Code: [Select]
Test Time (sec):    360
Total Transferred Bits:    0x00000001611FB100
Total Error Bits:    0x0000000000000C18
Error Ratio:    5.23e-07
Best regards
konrado5
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: kitz on April 06, 2014, 03:19:34 PM
Quote from: konrado5 on April 04, 2014, 08:46:05 PM
I've just tweaked my SNR margin slight more and I have 0.0-0.1 dB and about 1000 ES per hour.


*speechless*

Why on earth have you done that?   :-\
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: konrado5 on April 06, 2014, 03:41:07 PM
Quote from: kitz on April 06, 2014, 03:19:34 PM
Quote from: konrado5 on April 04, 2014, 08:46:05 PM
I've just tweaked my SNR margin slight more and I have 0.0-0.1 dB and about 1000 ES per hour.


*speechless*

Why on earth have you done that?   :-\
To test.
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: Black Sheep on April 06, 2014, 04:13:46 PM
Quote from: kitz on April 06, 2014, 03:19:34 PM
Quote from: konrado5 on April 04, 2014, 08:46:05 PM
I've just tweaked my SNR margin slight more and I have 0.0-0.1 dB and about 1000 ES per hour.


*speechless*

Why on earth have you done that?   :-\

Konrado ...... although you are 'barking', you do put a smile on my face. I think you also make Kitz consume TWO bottles of plonk a day, rather than the obligatory one !!. Keep experimenting.  ;) ;D ;D ;D
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: neilius on April 06, 2014, 06:54:48 PM
Good man, rules are made to be broken.   >:D
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: GigabitEthernet on April 06, 2014, 08:22:04 PM
Oh Konrado, you do make me laugh :D.

If I'm feeling sad, I just open a Konrado thread and I can't help but laugh :lol:.

Thanks buddy ;).
Title: Re: Stable connection despire very low SNR margin-puzzle
Post by: GigabitEthernet on April 06, 2014, 08:22:38 PM
Quote from: kitz on April 06, 2014, 03:19:34 PM
*speechless*

Why on earth have you done that?   :-\

LOL. I just laughed very hard :D.

 :lol: :lol: :lol: :lol: :lol: