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[burakkucat]

. . . did a quiet line test and it was very quiet, does it have to be a corded phone to do these tests or will dect phone work as thats what I used.

When performing a QLT, it is always advisable to use a classic, wired phone (plugged directly into the 'test socket' of the NTE5/A) as the use of a cordless phone could result in a false positive.

In this case you have observed a 'good silence', so I don't think the test needs to be repeated with a wired phone.

[NewtronStar]

In this case you have observed a 'good silence', so I don't think the test needs to be repeated with a wired phone.

thankyou very much BC  I really should buy one of them incase of powercuts and on that note
when our electric went off in March for 32 hours (SnowStorm) and when it did come back on the HG612 had it's highest sync ever line rate of 32Mbps and attainable rate of 35600, very strange unless the FTTC Cab also had a power outage and did a line reset for all customers. 

[NewtronStar]

If you want my experience, see here http://forum.kitz.co.uk/index.php/topic,12593.0.html
This assumes that the noise resulted in multiple resyncs within a short time-frame of < 24 hrs.  This seems likely, as if it only induced increased error rates, then recovery may be much less than that.

Cheers I was looking into your thread a few days ago, I just don't know my DLM has been very kind to me over the year and could do three reboots of the HG612 in 12 hours just for testing purposes and I got away with it , but as this is my first time the DLM has been not so kind to me and Modem has been in sync for 2-3 months (no manual reboots) by me until this last week when I notice this cap ! it looks like my hands are tied at the moment by the DLM or a fault and I don't look forward to try and explain to BT I lost 4Mbps in a week as I don't think it would warrant an investication 

[NewtronStar]

Well its looking good and two weeks to the day since the slow speed arrived the DLM has increased my path downstream rate and interleaving has gone down. 
Still waiting for the IP profile to change to 28Mbps !

[Bald_Eagle1]

With a sync speed of 28556 Kbps, your IP Profile should be around 27.64 Mbps (96.79% of sync speed.

If it is still lower than that, a ROUTER (not modem) disconnect/reconnect should update it accordingly.

Retrain Reason was 2, which indicates an 'on the fly' DLM initiated resycnc.
These are often too quick to be noticed by the IP Profile updating system & need user intervention to initiate a new PPP session via the ROUTER.

[NewtronStar]

With a sync speed of 28556 Kbps, your IP Profile should be around 27.64 Mbps (96.79% of sync speed.

If it is still lower than that, a ROUTER (not modem) disconnect/reconnect should update it accordingly.

Retrain Reason was 2, which indicates an 'on the fly' DLM initiated resycnc.
These are often too quick to be noticed by the IP Profile updating system & need user intervention to initiate a new PPP session via the ROUTER.

Yeap your spot on with the IP profile BE1 So all in all it looks like it takes the DLM two weeks to increase the IP profile when it's dectected noise on the line, as this is my first and hopefully last encounter with the DLM    i'll know what to look out for and the HG612 WinGraphs will be on permanently but not the PC sorry 
and Cheers for all the help

[gab81]

Gentlefolk,

Our experiences suggest that those lines that have had a fixed cap applied usually on 15, 20, 25, 30 or 35 Mbps are permanently fixed until a BT Openreach engineer has visited with his test instrument and then (s)he remembers to "reset the DLM".

Why some lines are capped at those values and some not still remains a mystery - at least to me.

Kind regards,
Walter

hi there

my line (40/10) seems to be "capped" down at 35000 since a few weeks, however i had a few ping changes and upload speed too.....current stats:

Max:    Upstream rate = 10993 Kbps, Downstream rate = 46708 Kbps
Path:   0, Upstream rate = 9995 Kbps, Downstream rate = 35000 Kbps

============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  0.1     7.4     10.4     N/A    4.4     10.2    18.3
Signal Attenuation(dB): 0.1     7.4     10.4     N/A    4.4     10.2    18.3
        SNR Margin(dB):   6.5     6.9     6.2      N/A    8.6       8.6      8.2
       TX Power(dBm): -11.3   -128.0  -8.4     N/A    9.8       7.4      0.6

worth to wait some more weeks rather than calling Sky and asking for a profile reset? this past friday ping went down to an awesome 5-6ms from 13ms which i had previously, so DLM is doing "something" but i wouldn't like if they might mess up the ping....

thanks
Gab

[Bald_Eagle1]

Hi gab81 & welcome to the Kitz forum.


Do you have any snapshot/ongoing graphs (recent and from before the capped 35 Mbps) for us to have a look at along with the full contents of the --pbParams & --stats data?


You do seem to have very low attainable rates (Max) for such low attenuation values.

Surprisingly, there isn't that much spare SNRM either & TX power looks rather low at first glance.

[gab81]

Hi gab81 & welcome to the Kitz forum.


Do you have any snapshot/ongoing graphs (recent and from before the capped 35 Mbps) for us to have a look at along with the full contents of the --pbParams & --stats data?


You do seem to have very low attainable rates (Max) for such low attenuation values.

Surprisingly, there isn't that much spare SNRM either & TX power looks rather low at first glance.

many thanks for the warm welcome, here's fresh stats just collected 5 mins ago (i don't have any old graphs since i unlocked recently) and yeah i can almost see the fibre cab from my window :-)

# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max:    Upstream rate = 11025 Kbps, Downstream rate = 46712 Kbps
Path:   0, Upstream rate = 9995 Kbps, Downstream rate = 35000 Kbps

Link Power State:       L0
Mode:                   VDSL2 Annex B
VDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                    Down            Up
SNR (dB):       8.5             6.5
Attn(dB):        0.0             0.0
Pwr(dBm):     12.0           -6.6
                        VDSL2 framing
                        Path 0
B:              239             235
M:              1               1
T:              64              7
R:              0               16
S:              0.2182          0.7508
L:              8799            2717
D:              1               1
I:              240             255
N:              240             255
                        Counters
                        Path 0
OHF:            9162486         1297178
OHFErr:         100             169
RS:             0               3574665
RSCorr:         0               1259
RSUnCorr:       0               0

                        Path 0
HEC:            52              0
OCD:            0               0
LCD:            0               0
Total Cells:    2159532391              0
Data Cells:     69434444                0
Drop Cells:     0
Bit Errors:     0               0

ES:             1217            1764
SES:            28              0
UAS:            341             341
AS:             32116

                        Path 0
INP:            0.00            0.00
PER:            3.49            11.82
delay:          0.00            0.00
OR:             59.57           152.21

Bitswap:        1915            481

Total time = 1 days 13 hours 45 min 41 sec
FEC:            0               0
CRC:            8930            0
ES:             1217            1764
SES:            28              0
UAS:            341             341
LOS:            0               0
LOF:            0               0
Latest 15 minutes time = 41 sec
FEC:            0               0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Previous 15 minutes time = 15 min 0 sec
FEC:            0               0
CRC:            1               0
ES:             1               11
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Latest 1 day time = 13 hours 45 min 41 sec
FEC:            0               0
CRC:            140             0
ES:             118             192
SES:            0               0
UAS:            126             126
LOS:            0               0
LOF:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            0               0
CRC:            2154            0
ES:             205             331
SES:            7               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Since Link time = 8 hours 55 min 15 sec
FEC:            0               1259
CRC:            100             169
ES:             82              141
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0

# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max:    Upstream rate = 11035 Kbps, Downstream rate = 46712 Kbps
Path:   0, Upstream rate = 9995 Kbps, Downstream rate = 35000 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959) (2792,4083)
Medley Phase (Final) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959) (2792,4083)
       VDSL Port Details       Upstream        Downstream
Attainable Net Data Rate:      11035 kbps         46712 kbps
Actual Aggregate Tx Power:    -   6.6 dBm          12.0 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  0.1     7.4     10.4     N/A    4.4     10.2    18.3
Signal Attenuation(dB): 0.1     7.4     10.4     N/A    4.4     10.2    18.3
        SNR Margin(dB):   6.1     7.0      6.3      N/A    8.6     8.6     8.1
        TX Power(dBm): -11.3   -128.0  -8.4      N/A    9.8     7.4     0.6

# xdslcmd info --show
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max:    Upstream rate = 11025 Kbps, Downstream rate = 46712 Kbps
Path:   0, Upstream rate = 9995 Kbps, Downstream rate = 35000 Kbps

Link Power State:       L0
Mode:                   VDSL2 Annex B
VDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        8.5             6.5
Attn(dB):        0.0             0.0
Pwr(dBm):        12.0           -6.6
                        VDSL2 framing
                        Path 0
B:              239             235
M:              1               1
T:              64              7
R:              0               16
S:              0.2182          0.7508
L:              8799            2717
D:              1               1
I:              240             255
N:              240             255
                        Counters
                        Path 0
OHF:            9224113         1315419
OHFErr:         100             172
RS:             0               428678
RSCorr:         0               1270
RSUnCorr:       0               0

                        Path 0
HEC:            52              0
OCD:            0               0
LCD:            0               0
Total Cells:    2174057474              0
Data Cells:     69435177                0
Drop Cells:     0
Bit Errors:     0               0

ES:             1217            1767
SES:            28              0
UAS:            341             341
AS:             32332

                        Path 0
INP:            0.00            0.00
PER:            3.49            11.82
delay:          0.00            0.00
OR:             59.57           152.21

Bitswap:        1956            481

and all this with a ping of 5-6ms which is pretty awesome.

following graphs, they are not on 24/7 though..

thanks a lot!
Gabrio

[gab81]

here stats:

[gab81]

btw something interesting, i just realized that in the last graphs i collected earlier today, the green lines were not there in the frequencies, it seems like it's populating those blanks now.... good or bad?

see this one, 12.00 today:

[Bald_Eagle1]

We can see from your Band Plans that you are connected to an ECI DSLAM.

QLN & Hlog data is only collected during the training stage when a connection syncs/resyncs & remains static until the next resync.
SNR & Bitloading is constantly monitored & updated (unless using the new 35m BLOB, when Bitloading also remains static until the next resync).

ECI DSLAMS occasionally send upstream data at a resync (shown green), whereas Huawei DSLAMS never send it.
So, occasionally seeing US data in the current (snapshot) graphs is actually a good thing.


Looking at your Hlog graph, apart from it being slightly wavy in the higher frequency D3 band, I can't see any issues & it confirms very low attenuation per frequency tone.

However, your QLN graph does show quite a high level of background 'noise'. No doubt hence the low SNR, SNRM & Attainable rate values.
I would usually have expected SNRM values to be around 20 (or more) for your 40 Mb connection i.e. loads of scope for stability & higher speeds.



Your connection is currently operating on fastpath for DS & US (D: = 1 for both), which probably explains the low ping times.
Impulse Noise Protection is zero for US & DS, as is delay.


We can see quite a few errored seconds though, along with fairly low values of CRC/HEC errors.

On their own, that doesn't look too bad, but they do seem quite high for a connection with such low attenuation values.


It's a pity you don't have any older stats for comparison, so it's impossible to say if the highish background noise etc. is a recent issue.

That may well be the cause of the 35 Mbps capping, although I have read somewhere that Sky customers are placed on more 'stable' (lower speed) profiles than other FTTC users.
I can't confirm that as fact though.


If possible, I would try to allow monitoring 24/7, at least for a few days, in order to obtain a longer term picture of your connection's performance/statistics before pursuing anything with Sky.

The connection must have resynced yesterday (possibly around 3:00 pm)?
Was that initiated by yourself (maybe via a modem reboot, power cycle or disconnecting from/reconnecting to the master socket)?

If you wished to use the attached updated GRAPH6.exe in place of the original one, it will provide connection up time at the time the data is collected.

The first program update is also now due, possibly this week or next.
It will provide a bit more data along with collecting the ongoing stats a little more efficiently etc.

[gab81]

We can see from your Band Plans that you are connected to an ECI DSLAM.

QLN & Hlog data is only collected during the training stage when a connection syncs/resyncs & remains static until the next resync.
SNR & Bitloading is constantly monitored & updated (unless using the new 35m BLOB, when Bitloading also remains static until the next resync).

ECI DSLAMS occasionally send upstream data at a resync (shown green), whereas Huawei DSLAMS never send it.
So, occasionally seeing US data in the current (snapshot) graphs is actually a good thing.


Looking at your Hlog graph, apart from it being slightly wavy in the higher frequency D3 band, I can't see any issues & it confirms very low attenuation per frequency tone.

However, your QLN graph does show quite a high level of background 'noise'. No doubt hence the low SNR, SNRM & Attainable rate values.
I would usually have expected SNRM values to be around 20 (or more) for your 40 Mb connection i.e. loads of scope for stability & higher speeds.



Your connection is currently operating on fastpath for DS & US (D: = 1 for both), which probably explains the low ping times.
Impulse Noise Protection is zero for US & DS, as is delay.


We can see quite a few errored seconds though, along with fairly low values of CRC/HEC errors.

On their own, that doesn't look too bad, but they do seem quite high for a connection with such low attenuation values.


It's a pity you don't have any older stats for comparison, so it's impossible to say if the highish background noise etc. is a recent issue.

That may well be the cause of the 35 Mbps capping, although I have read somewhere that Sky customers are placed on more 'stable' (lower speed) profiles than other FTTC users.
I can't confirm that as fact though.


If possible, I would try to allow monitoring 24/7, at least for a few days, in order to obtain a longer term picture of your connection's performance/statistics before pursuing anything with Sky.

The connection must have resynced yesterday (possibly around 3:00 pm)?
Was that initiated by yourself (maybe via a modem reboot, power cycle or disconnecting from/reconnecting to the master socket)?

If you wished to use the attached updated GRAPH6.exe in place of the original one, it will provide connection up time at the time the data is collected.

The first program update is also now due, possibly this week or next.
It will provide a bit more data along with collecting the ongoing stats a little more efficiently etc.

hi

thanks a lot for the very detailed answer, wish there was a guide to understand all parameters!!! I will leave it for a few days and post data let's say wednesday. I can tell something is changing though, U SNR is going up for one band, in fact attainable sync is slowly going up too, right now it's 11057. D SNR also changing a bit and attainable sync is on 46860 - 47000ish right now.

i did test the background noise some weeks ago with that special phone number and the voice said "i detect little noise, your line is OK". can't remember the number....

and yes, connection resynced yesterday, i "tried" to change SNR with the "configure" parameter but nothing happened, tried twice, didn't work, didn't touch it anymore.

thanks
Gabrio

[Bald_Eagle1]

thanks a lot for the very detailed answer, wish there was a guide to understand all parameters!!! I will leave it for a few days and post data let's say wednesday. I can tell something is changing though, U SNR is going up for one band, in fact attainable sync is slowly going up too, right now it's 11057. D SNR also changing a bit and attainable sync is on 46860 - 47000ish right now.

i did test the background noise some weeks ago with that special phone number and the voice said "i detect little noise, your line is OK". can't remember the number....

I suppose that must be a Sky number.
I use the usual BT 17070 number for my Plusnet connection, but it doesn't mention anything about detected noise levels.

and yes, connection resynced yesterday, i "tried" to change SNR with the "configure" parameter but nothing happened, tried twice, didn't work, didn't touch it anymore.

That does work with the HG612 modem, but only when used with an ADSL connection.
DLM fully controls a number of things for VDSL2 (FTTC) connections, the SNR tweak being one of them that has no effect.

 

[gab81]

thanks a lot for the very detailed answer, wish there was a guide to understand all parameters!!! I will leave it for a few days and post data let's say wednesday. I can tell something is changing though, U SNR is going up for one band, in fact attainable sync is slowly going up too, right now it's 11057. D SNR also changing a bit and attainable sync is on 46860 - 47000ish right now.

i did test the background noise some weeks ago with that special phone number and the voice said "i detect little noise, your line is OK". can't remember the number....

I suppose that must be a Sky number.
I use the usual BT 17070 number for my Plusnet connection, but it doesn't mention anything about detected noise levels.

and yes, connection resynced yesterday, i "tried" to change SNR with the "configure" parameter but nothing happened, tried twice, didn't work, didn't touch it anymore.

That does work with the HG612 modem, but only when used with an ADSL connection.
DLM fully controls a number of things for VDSL2 (FTTC) connections, the SNR tweak being one of them that has no effect.

Got it, yes i have a sky phone number and yeah that's the number, i just tried it and Zoe was quite happy, i tried the test 1) success and the 4) echo/noise, she said "there is no echo on your line and there is very little noise, your line is working properly. tried this like 4 times, same result.

thanks
Gab