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[bazer]

with tt in my stats have a high dl attenuation of 41.5 db also snr various from 12 db to 8 db on a 12 db profile at moment trying to get tt to to an end to end line test as this is the only reliable test ive bee an electronic engineer for over 40 years look after all sorts of radio networks core networks for isps but dealing with talk talk is driving me mad this all started when the phone would work but would not ring and BT or did something I was a t.o. with BT as well long time ago but all I will say is BT love to say right when tested tt say they will send an engineer out but if no fault is found or wiring fault at my house will charge £50 and have to agree to a disclaimer,I have replaced the cable from  the front door to the BT box .
the box is latest BT open reach  type I have included stats etc any comments welcome baz ps i forgot to mention i cant stream tv most of the time get buffering etc and have to reboot router to get a decent connection which at times is very unstable

[burakkucat]

Hello bazer. Welcome to the Kitz forum.

I have looked at the graphs and data that you have provided. Predominately, everything looks satisfactory. The US SNRM graph looks to be a bit 'erratic' but as the data shown was only captured for a short period of time, that may just be an artefact.

What would be very useful to see is a complete 24 hours worth of RouterStats graphs for the DS & US SNRM. That way we can get a better feeling for how your line is performing.

It may possibly be that you are suffering from the effects of congestion in the back-haul, beyond the exchange, rather that a physical line fault between the TalkTalk MSAN and your CPE.

[bazer]

 Thanks for the reply talk talk have said they have passed this on to the network team and always comeback and say there is no problem with their network etc.
 As you say it could be back, haul problems etc but a neighbour can sync at eight Meg and he gets no buffering but he is with a different provider I will leave the line stats on for a longer time thanks baz

[bazer]

here are rx snr router stats

[bazer]

here are more line stats more to follow

[bazer]

and the last one thanks baz

[burakkucat]

Thank you for the graphs, baz.

Considering the DS graphs (Rx) first, they show the typical downward depression during the hours of darkness. However the daytime - night time delta is really quite small. As you are clearly on a profile that has set the DS target SNRM to 12 dB and that there is plenty of 'reserve' when fully depressed, it would be to your advantage to have the profile changed to that with a DS target SNRM of 9 dB (or even 6 dB).

The 'spikiness' of the US graphs (Tx) is somewhat unusual. However I am not too concerned with that, a.t.m.

Which modem/router are you using? Is it the TalkTalk supplied device or one you have obtained, independently?

I've just re-read your initial post and have noticed that you were, at one time, a BT TO.   Clearly there is nothing wrong with the internal wiring, your side of the NTP, but TalkTalk will not accept that. 

You will find that the support from the official TalkTalk Members' Forum [1] is far superior than their telephone support. If you are not already a member of the TT forum, I would suggest that you register there and then post a request asking one of the OCE's to make an adjustment to your profile, as mentioned above.

[1] http://www.talktalkmembers.com/forums/index.php

[bazer]

thanks for the reply at the moment im on my old netgear DG834PN with 109 firmware have a dlink dsl2680 from tt which I flashed with a dlink firmware also a netgear dg834 v3 and a Siemens router from tt which if I remember can sync at low rx s/ n r ,
one thing I have noticed is it that the router always  takes 2 attempts’ for the router to connect to the other adsl router in the exchange then shortly after that router syncs and the ppp light goes green is this normal its the same with the dlink router , it always has to go through the recycle loop twice to connect to the exchange they are normally fujitsu adsl modems in the exchange I also worked for Marconi as a commissioning engineer a good few years ago , im in the talk talk forum have asked to change target s/n profile to 9 db thanks again baz
ps here is some stas from the dg834pn



BusyBox v1.00 (2008.08.14-04:05+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

# adslctl info --stats
adslctl: ADSL driver and PHY status
Status: ShowtimeRetrain Reason: 8000
Channel: FAST, Upstream rate = 799 Kbps, Downstream rate = 6091 Kbps
Link Power State: L0
Mode:                   ADSL2+
Channel:                Fast
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):       11.2            12.7
Attn(dB):       41.5            19.9
Pwr(dBm):       0.0             13.0
Max(Kbps):      6976            784
Rate (Kbps):    6091            799
                        G.dmt framing
K:              191(0)          25
R:              0               0
S:              1               1
D:              1               1
                        ADSL2 framing
MSGc:           59              12
B:              190             24
M:              1               1
T:              1               4
R:              0               0
S:              0.9980          0.9900
L:              1531            202
D:              1               1
                        Counters
SF:             814921          777392
SFErr:          97              0
RS:             0               0
RSCorr:         0               0
RSUnCorr:       0               0

HEC:            74              0
OCD:            0               0
LCD:            0               0
Total Cells:    189893655               568192
Data Cells:     3652851         76873
Drop Cells:     0
Bit Errors:     0               0

ES:             56              0
SES:            0               0
UAS:            34              0
AS:             13217

INP:            0.00            0.00
PER:            16.21           17.82
delay:          0.24            0.24
OR:             32.06           8.08

Bitswap:        2563            8

Total time = 3 hours 41 min 7 sec
SF  = 814921
CRC = 97
LOS = 0
LOF = 0
ES  = 56
Latest 1 day time = 3 hours 41 min 7 sec
SF  = 814921
CRC = 97
LOS = 0
LOF = 0
ES  = 56
Latest 15 minutes time = 11 min 7 sec
SF  = 41188
CRC = 1
LOS = 0
LOF = 0
ES  = 1
Previous 15 minutes time = 15 min 0 sec
SF  = 55474
CRC = 1
LOS = 0
LOF = 0
ES  = 1
Previous 1 day time = 0 sec
SF  = 0
CRC = 0
LOS = 0
LOF = 0
ES  = 0
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF  = 55536
CRC = 3
LOS = 0
LOF = 0
ES  = 3
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF  = 55475
CRC = 8
LOS = 0
LOF = 0
ES  = 3
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF  = 55474
CRC = 4
LOS = 0
LOF = 0
ES  = 4
Showtime Drop Reason:   8000
Last Retrain Reason:    8000
#
#
#
#

[burakkucat]

   Hmm . . .

I've had a look at the statistics from your DG834PN and there is nothing present that 'jumps out at me' to indicate a line fault.

As for the device taking two 'discovery' cycles before viable sync is attained with the remote MSAN, that is something I have also observed. In my case, when I use either a 2Wire 2700HG, 2700HG-B, 2700HGV or 2701HGV-C the attempts can be seen in the log. It first tries with ADSL2+ and then drops back to ADSL2 -- as the latter is deemed to be more appropriate for my line. 

[bazer]

ok thanks for your help i have asked tt forum to change profile to 9 db target see how  we go then thanks baz old alltime wise i hope comms engineer

[burakkucat]

   You're welcome.

[bazer]

hi there i have had the line profile changed to a target of 9 db

here are some ping times and trace routs

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\barrie>ping www.google.com

Pinging www.google.com [173.194.67.106] with 32 bytes of data:

Reply from 173.194.67.106: bytes=32 time=16ms TTL=46
Reply from 173.194.67.106: bytes=32 time=15ms TTL=46
Reply from 173.194.67.106: bytes=32 time=16ms TTL=46
Reply from 173.194.67.106: bytes=32 time=16ms TTL=46

Ping statistics for 173.194.67.106:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 15ms, Maximum = 16ms, Average = 15ms

C:\Documents and Settings\barrie>



Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\barrie>ping www.google.com

Pinging www.google.com [173.194.67.106] with 32 bytes of data:

Reply from 173.194.67.106: bytes=32 time=16ms TTL=46
Reply from 173.194.67.106: bytes=32 time=15ms TTL=46
Reply from 173.194.67.106: bytes=32 time=16ms TTL=46
Reply from 173.194.67.106: bytes=32 time=16ms TTL=46

Ping statistics for 173.194.67.106:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 15ms, Maximum = 16ms, Average = 15ms

C:\Documents and Settings\barrie>

[bazer]

and last ones  thanks again baz

[broadstairs]

I've been following this thread with interest as I am a TT customer as well and have slightly higher attenuation than you indicating I am a bit further from the exchange but I achieve a rock solid 8600mbps on a 6db 24meg profile, so you should also be able to achieve slightly better than I do with your slightly lower attenuation. I do know from what you have said that you have a selection of routers. My experience with my TT line is that my Netgear was not as good as my D-Link 2740B and now that has started to fail I have an Huawei HG612 from ebay setup for my ADSL2+ line and that works a treat and the snrm does not drop much below 4db during the peak evening time and recovers to about 6.4db during the day. The HG612 has been up for nearly a month with no drops at all.

I am be mistaken but I think your stats earlier on showed you may be on a fast path profile which I think might not be as stable as an interleaved one (Channel: Fast in the stats). I wonder if it might be worth getting that changed, max speed might drop a little but if it is more stable then you could try a 6db profile.

Stuart

[burakkucat]

I'm going to agree with Broadstairs Stuart. From what we see of your DS SNRM graphs, the line should easily cope with a target margin of 6 dB and if it is not using interleaved mode, I would recommend having it enabled.

I am another TT customer and have requested that the DLM be switched off for my line, along with being placed on the 8ISNR6 profile.

Using a Huawei HG612 as a modem/two port router, I have reduced the DS target margin by two to 4 dB. By doing all of the above, I now have the line performing at its best --

Code: [Select]

# xdslcmd info
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 940 Kbps, Downstream rate = 6016 Kbps
Path: 0, Upstream rate = 940 Kbps, Downstream rate = 5820 Kbps

#