Kitz ADSL Broadband Information
adsl spacer  
Support this site
Home Broadband ISPs Tech Routers Wiki Forum
 
     
   Compare ISP   Rate your ISP
   Glossary   Glossary
 
Please login or register.

Login with username, password and session length
Advanced search  

News:

Pages: 1 [2] 3

Author Topic: High FEC Count - ECI Equipped Cabinet  (Read 3181 times)

ktz392837

  • Reg Member
  • ***
  • Posts: 376
Re: High FEC Count - ECI Equipped Cabinet
« Reply #15 on: April 16, 2018, 11:30:06 AM »

Does anyone know if limiting sync speed is safe? 

The DLM or whatever doesn't start thinking that is the max speed of the line and start using it for diagnosing line problems or for setting the hand back thresholds?

Lowering your hand back thresholds would not be the best thing to do?

I have always been reluctant to apply a cap due to these concerns?

Thanks
Logged

Ixel

  • Kitizen
  • ****
  • Posts: 1072
Re: High FEC Count - ECI Equipped Cabinet
« Reply #16 on: April 16, 2018, 11:35:26 AM »

I think there's a risk it might apply banding itself if it sees the sync rate/SNR margin wildly fluctuate/change, which is probably why my first line is currently banded (for some reason it got re-synced much lower after the engineer did the second line at the cabinet, FTTC, and it has a much higher attainable rate).
Logged

tubaman

  • Kitizen
  • ****
  • Posts: 2137
Re: High FEC Count - ECI Equipped Cabinet
« Reply #17 on: April 16, 2018, 11:39:58 AM »

@hushcoden - have you actually rebooted as it doesn't appear to have cleared your cap. You're still stuck on a DS sync of 30k.
 :no:
Logged
BT FTTC 80/20 Huawei Cab - Netgear D6220

re0

  • Reg Member
  • ***
  • Posts: 359
Re: High FEC Count - ECI Equipped Cabinet
« Reply #18 on: April 16, 2018, 11:41:38 AM »

Does anyone know if limiting sync speed is safe? 

The DLM or whatever doesn't start thinking that is the max speed of the line and start using it for diagnosing line problems or for setting the hand back thresholds?

Lowering your hand back thresholds would not be the best thing to do?

I have always been reluctant to apply a cap due to these concerns?

Thanks

I can say that I honestly don't know, but I would also be rather concerned for the reasons you highlighted. As the DLM is always collecting stats, there is no reason to why it would not adjust estimates and handback in relation to the line's performance. But that's, to some degree, an assumption as I have no solid proof though it is plausible considering estimates do change based on conditions.

Perhaps someone here has read some BT documentation, but maybe they can't disclose the inner workings. :-\
Logged

hushcoden

  • Reg Member
  • ***
  • Posts: 149
Re: High FEC Count - ECI Equipped Cabinet
« Reply #19 on: April 16, 2018, 01:14:41 PM »

@hushcoden - have you actually rebooted as it doesn't appear to have cleared your cap. You're still stuck on a DS sync of 30k.
 :no:
Well, my line is 40/10 and now with cap is 30/10, correct?

Anyway, I will keep this cap for 48 hours and then I will reboot the ZyXEL and this should remove the cap...
« Last Edit: April 16, 2018, 01:16:48 PM by hushcoden »
Logged

tubaman

  • Kitizen
  • ****
  • Posts: 2137
Re: High FEC Count - ECI Equipped Cabinet
« Reply #20 on: April 16, 2018, 01:27:00 PM »

Ah, I misunderstood - you have just applied the cap (I was thinking you were trying to release it :-[).
Here's hoping it works.
 :)
Logged
BT FTTC 80/20 Huawei Cab - Netgear D6220

hushcoden

  • Reg Member
  • ***
  • Posts: 149
Re: High FEC Count - ECI Equipped Cabinet
« Reply #21 on: April 19, 2018, 08:29:08 PM »

So I've rebooted the rooter after 72 hours and it seems this made the trick  :graduate:

Code: [Select]
xdslctl info --stats
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 22531 Kbps, Downstream rate = 81398 Kbps
Bearer: 0, Upstream rate = 9995 Kbps, Downstream rate = 39970 Kbps

Link Power State:       L0
Mode:                   VDSL2 Annex B
VDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode(0x0)
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        17.5            16.0
Attn(dB):        15.0            0.0
Pwr(dBm):        1.6             1.6

                        VDSL2 framing
                        Bearer 0
MSGc:           19              219
B:              239             235
M:              1               1
T:              64              7
R:              0               16
S:              0.1911          0.7508
L:              10048           2717
D:              1               1
I:              240             255
N:              240             255

                        Counters
                        Bearer 0
OHF:            1801732         467794
OHFErr:         150             0
RS:             0               3695479
RSCorr:         0               0
RSUnCorr:       0               0

                        Bearer 0
HEC:            329             0
OCD:            0               0
LCD:            0               0
Total Cells:    425069939               0
Data Cells:     32990935                0
Drop Cells:     0
Bit Errors:     0               0

ES:             87              0
SES:            0               0
UAS:            30              30
AS:             5532

                        Bearer 0
INP:            0.00            0.00
INPRein:        0.00            0.00
delay:          0               0
PER:            3.06            11.87
OR:             65.16           151.62
AgR:            40035.61        10146.45

Bitswap:        243/243         0/0

Total time = 1 hours 32 min 42 sec
FEC:            0               0
CRC:            150             0
ES:             87              0
SES:            0               0
UAS:            30              30
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 2 min 42 sec
FEC:            0               0
CRC:            19              0
ES:             8               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 15 minutes time = 15 min 0 sec
FEC:            0               0
CRC:            67              0
ES:             28              0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 1 hours 32 min 42 sec
FEC:            0               0
CRC:            150             0
ES:             87              0
SES:            0               0
UAS:            30              30
LOS:            0               0
LOF:            0               0
LOM:            0               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
LOM:            0               0
Since Link time = 1 hours 32 min 11 sec
FEC:            0               0
CRC:            150             0
ES:             87              0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
Logged

hushcoden

  • Reg Member
  • ***
  • Posts: 149
Re: High FEC Count - ECI Equipped Cabinet
« Reply #22 on: April 24, 2018, 07:42:36 PM »

So unlucky... it seems my line doesn't like a delay=0 and INP=0, so after 5 days I am back to square one

Code: [Select]
> xdslctl info --stats
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    1
Last initialization procedure status:   0
Max:    Upstream rate = 22327 Kbps, Downstream rate = 88961 Kbps
Bearer: 0, Upstream rate = 9995 Kbps, Downstream rate = 39994 Kbps

Link Power State:       L0
Mode:                   VDSL2 Annex B
VDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode(0x0)
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        16.5            15.9
Attn(dB):        15.0            0.0
Pwr(dBm):        1.7             1.6

                        VDSL2 framing
                        Bearer 0
MSGc:           18              219
B:              31              235
M:              1               1
T:              64              7
R:              10              16
S:              0.0255          0.7508
L:              13200           2717
D:              1283            1
I:              42              255
N:              42              255

                        Counters
                        Bearer 0
OHF:            48701237                173611
OHFErr:         27              0
RS:             1521251008              885830
RSCorr:         320256          0
RSUnCorr:       234             0

                        Bearer 0
HEC:            41              0
OCD:            0               0
LCD:            0               0
Total Cells:    598865071               0
Data Cells:     109209334               0
Drop Cells:     0
Bit Errors:     0               0

ES:             3577            0
SES:            36              0
UAS:            70              60
AS:             119494

                        Bearer 0
INP:            3.50            0.00
INPRein:        0.00            0.00
delay:          8               0
PER:            2.45            11.87
OR:             78.26           151.62
AgR:            40072.04        10146.45

Bitswap:        4511/4513               0/0

Total time = 5 days 42 min 55 sec
FEC:            320256          0
CRC:            27              0
ES:             3577            0
SES:            36              0
UAS:            70              60
LOS:            1               0
LOF:            7               0
LOM:            0               0
Latest 15 minutes time = 12 min 55 sec
FEC:            3911            0
CRC:            2               0
ES:             1               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 15 minutes time = 15 min 0 sec
FEC:            3695            0
CRC:            3               0
ES:             1               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 42 min 55 sec
FEC:            16940           0
CRC:            5               0
ES:             2               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            215707          0
CRC:            18              0
ES:             9               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 1 days 9 hours 11 min 33 sec
FEC:            320256          0
CRC:            27              0
ES:             12              0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
Never mind, that's probably also due to the fact I am connected to the 'best in class' ECI cab  :crazy:
Logged

ejs

  • Kitizen
  • ****
  • Posts: 1761
Re: High FEC Count - ECI Equipped Cabinet
« Reply #23 on: April 24, 2018, 08:10:03 PM »

Have you tried a different modem, maybe even a Lantiq one?
Logged

Ixel

  • Kitizen
  • ****
  • Posts: 1072
Re: High FEC Count - ECI Equipped Cabinet
« Reply #24 on: April 25, 2018, 12:38:46 AM »

I'd definitely try another modem with a Lantiq/Infineon chipset. In my experience they work better in terms of error rates and tend to give the best latency too (up to a few milliseconds less than Broadcom on ECI DSLAM's) albeit at a cost of a slight reduction in attainable downstream sync rate.
Logged

hushcoden

  • Reg Member
  • ***
  • Posts: 149
Re: High FEC Count - ECI Equipped Cabinet
« Reply #25 on: April 25, 2018, 06:40:17 PM »

Right then, will try to find a second hand Vigor 130...

And one question: from the stats I see my line is Annex B, so does it mean I should flash the Vigor 130 with the Annex B firmware rather than with the Annex A one ?
Logged

ejs

  • Kitizen
  • ****
  • Posts: 1761
Re: High FEC Count - ECI Equipped Cabinet
« Reply #26 on: April 25, 2018, 08:06:47 PM »

Probably not, because that Draytek firmware is probably referring to the ADSL Annex.

ADSL Annex A is ADSL over POTS - what we use in the UK
ADSL Annex B is ADSL over ISDN

VDSL2 Annex A is bandplans for North America
VDSL2 Annex B is bandplans for Europe
Logged

hushcoden

  • Reg Member
  • ***
  • Posts: 149
Re: High FEC Count - ECI Equipped Cabinet
« Reply #27 on: April 25, 2018, 08:38:37 PM »

Thanks ejs, I will double-check but I remember I have seen stats of some member of the forum (UK based) where their line was VDSL2 Annex A  :-\
Logged

ejs

  • Kitizen
  • ****
  • Posts: 1761
Re: High FEC Count - ECI Equipped Cabinet
« Reply #28 on: April 25, 2018, 09:04:50 PM »

Unfortunately some devices can be rather ambiguous as to which annex they are referring to.
Logged

j0hn

  • Kitizen
  • ****
  • Posts: 1878
Re: High FEC Count - ECI Equipped Cabinet
« Reply #29 on: April 25, 2018, 09:30:47 PM »

Thanks ejs, I will double-check but I remember I have seen stats of some member of the forum (UK based) where their line was VDSL2 Annex A  :-\

We most definitely use VDSL2 Annex B Profile 17a in the UK.
A number of devices incorrectly report Annex A.
Logged
BT FTTC 55/10 ECI now Huawei cab
Zyxel VMG1312-B10A bridge mode with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin
Pages: 1 [2] 3
 

anything