Kitz Forum
Broadband Related => FTTC and FTTP Issues => Topic started by: jmacp on December 04, 2017, 09:11:14 PM
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Hi
Basically been installed for about a month spent the first week messing about with my line router etc. I managed to get high interleaving and a low sync speed as a result. During the past 2 weeks I have left the line alone except for the odd 30 minute reboot but it shows no improvement in interleaving status sync speed etc.
I am on an ECI cab so I have manually throttled the connection to 60mb / 20mb to hopefully get speeds up. I attach the line stats below hopefully someone can interpret them for me and let me know what my line is doing / comment on the quality of the line?
Thanks John
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 23601 Kbps, Downstream rate = 76876 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 59993 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): 7.7 6.5
Attn(dB): 14.7 0.0
Pwr(dBm): 12.7 5.1
VDSL2 framing
Bearer 0
MSGc: 14 150
B: 47 236
M: 1 1
T: 64 5
R: 14 16
S: 0.0255 0.3771
L: 19480 5410
D: 1273 1
I: 62 255
N: 62 255
Counters
Bearer 0
OHF: 114990554 583171
OHFErr: 97 94
RS: 3667623029 2537803
RSCorr: 270363 568
RSUnCorr: 3752 0
Bearer 0
HEC: 882 0
OCD: 35 0
LCD: 35 0
Total Cells: 216393831 0
Data Cells: 793594990 0
Drop Cells: 0
Bit Errors: 0 0
ES: 13 1161
SES: 0 0
UAS: 2418 307896
AS: 188122
Bearer 0
INP: 3.50 0.00
INPRein: 0.00 0.00
delay: 8 0
PER: 1.63 6.15
OR: 97.80 202.87
AgR: 60090.43 20203.27
Bitswap: 87025/87025 38/40
Total time = 1 days 4 hours 55 min 40 sec
FEC: 270363 568
CRC: 97 94
ES: 13 1161
SES: 0 0
UAS: 2418 307896
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 10 min 40 sec
FEC: 78 0
CRC: 0 0
ES: 0 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: 201 1
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 4 hours 55 min 40 sec
FEC: 18758 51
CRC: 0 10
ES: 0 9
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 121560 247
CRC: 55 41
ES: 4 36
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 2 days 4 hours 15 min 21 sec
FEC: 270363 568
CRC: 97 94
ES: 13 1161
SES: 0 0
UAS: 0 305478
LOS: 0 0
LOF: 0 0
LOM: 0 0
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Welcome to the Kitz forum. :)
I can't see anything of significance in that snapshot of the statistics you have posted. However others may do so.
Which modem/router are you using?
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HG 612 3b for info.
John
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Ah, thank you.
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What would be useful is if you could set up a monitoring system (a Raspberry Pi, for example) and then upload the data to MDWS (http://forum.kitz.co.uk/index.php/topic,14361.0.html).
With the sight of live, on-going, statistics our members with analytical minds should then be able to give you a technical description of your circuit's performance.
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Hi
Basically been installed for about a month spent the first week messing about with my line router etc. I managed to get high interleaving and a low sync speed as a result.
This part worry's me was this manual disconnections IE more than 20 per day ?
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HI
TBH I was restarting the line a lot during the first week so it is possible. During the past 2 weeks I think I've only restarted a few times 2/3 for 30 mins plus. I haven't been messing about with it at all. I manually applied 60/20 to try and get DLM to do something?
MDWS setup as per advice as jmacp.
Thanks
John
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No expert at this i would wait for a more seasoned reply but my comments below.
With you being around SNR 6db your manual speed limit is probably not enough to force the DLM to do anything. You are limiting to 60Mbs but your best speed is around 60Mbs.
For your attenuation 14.7db 60Mb is probably a bit below average. As ECI cab have no Ginp or 3db technologies it is certainly not bad though.
When you resync do you connect at a different speed each time? If you always connect at 59993 you are banded at this maximum speed. If your line conditions ever got better removing this banding is difficult (VERY difficult).
A different modem may be better suited to your line. IIRC for my line (an ECI cab and slightly worse attenuation) a Zyxel 8324 had many less errors than a HG612 but the ECI modem had better sync speeds. I did post a comparison a bit ago. Every line is different though so no guarrentees but there are certainly better chipsets than what's in the Hg612 now.
The All User Stats on MDWS is great to compare your line with others. Sort by DSLAM and Attn and see how you compare.
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I agree regarding the SNRM, DLM is unlikely to do anything (improvements if you're banded) unless it's much higher. HG612's certainly have been known to produce intermittent blips of packet loss on lines connected to ECI DSLAM's, so I would only recommend using HG612's with ECI DSLAM's as a method to get detailed statistics about your connection.
I would recommend swapping to either a DrayTek Vigor (I use the 2860 currently on 'vector4' firmware which has a newer modem firmware) or an ECI /r modem, both of which have the same chipset vendor as the ECI DSLAM. The former however will give you some statistics about your line, where the latter won't really (easily) unless it happens on be on LEDE firmware. In my experience, for my own connection (which is strange), the DrayTek performs the best in terms of stability. Slightly less attainable speed but I believe that's due to the fact the HG612 doesn't appear to use reed solomon coding 'R' on the downstream when on fastpath where the DrayTek does (and probably any other modem using an Infineon/Lantiq chipset). The unlocked ECI /r with LEDE firmware showed the same instability as the HG612, as did a Zyxel when I tried that too, so unless your line is good/reasonable then I don't feel I can recommend devices with a Broadcom chipset. An ECI /r on the standard locked or unlocked non-LEDE firmware should be fine though. You can also adjust the downstream SNRM target offset between -5 to +5 dB on the DrayTek, which is nice if you want to try and squeeze more speed or have more stability on your connection.
Your attainable rates may well be a little lower than average as previous reply stated. For comparison, my downstream attenuation is 16 dB and I'm getting an attainable rate of 82117 downstream (probably nearer to around 90000 if I didn't have reed solomon coding 'R', and yes I am on fastpath) and 24090 upstream last I checked. I'm curious to know what your DSLAM's (line card actually) firmware version is, generally I believe most ECI connections are on 0xb206 but there are some which are on 0xd086 like me. You can fetch this with 'xdslcmd info --vendor' (without quotes) if connected to the modem via telnet, or alternatively on DSLstats on one of the tabs (Stats?) though I can't remember the exact name of the tab.
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Vendor Info Just reading through replys taking in info ATM
John
# xdslcmd info --vendor
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 23567 Kbps, Downstream rate = 77112 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 59993 Kbps
ChipSet Vendor Id: IFTN:0xd086
ChipSet VersionNumber: 0xd086
ChipSet SerialNumber:
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+1 recommend you get a Vigor. I used a bunch of BDCM based modem/routers and frequently got interleaved. Since getting a Vigor 130 I have always been on FastPath, and see less than 30 ES per day!
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INP 3.5 isnt Interleave High. 4.5 is High.
Delay is only 8ms so your DLM profile is probably Interleaving Low.
Last time I was interleaved it took DLM a couple of weeks to remove it.
Because the line is currently interleaved the max attianable show by your router is vastly over inflated.
Your SNRm is 7.7, so based on a target SNRM of 6.3dB, your max attainable is more like 66/67/68 Mbps if the line wasn't interleaved.
Re the BCM -v- Lantiq chipset debate. I'm on an ECI cab and the BCM chips have always performed much better on my line.
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With regards to the comments about the HG612 paired with an ECI cabinet, I couldn't disagree more.
The HG612 3B performed better on my ECI line than 3 different Lantiq chipsets I tried. Only newer Broadcom chipsets have outperformed the HG612 (both ZyXELs).
I think a couple members may have read your snrm back to front. It's 7.7dB, not 6dB, so a nice capped margin.
You appear to have low interleaving. It's usually a minimum of 10-11 days till DLM removes this.
Your ES numbers are very low.
Your FEC numbers average out low enough for interleaving to drop.
I would leave everything as is. Give it a week or 2 and the line should revert to fastpath. Failing that increase your cap to 55Mb.
Manual resyncs will never trigger DLM to relent, only to apply harsher interleaving/banding. Completely leave the line as is and it will relent on no time.
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I waited 5 weeks for dlm to remove interleaving and delay. it did not even though error free. I capped my sync to 54mb, 8 days it was gone. I then powered the modem on/off and my sync return to my normal value. if dlm does not let go then cap your sync till it does..
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Can I ask why you capped your sync at 54 ?
John
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Can I ask why you capped your sync at 54 ?
To get DLM to remove interleaving and delay
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to get as little errors as poss on the ds so dlm would relent. It was only a temporary cap until I went back to fastpath (I lost fastpath for an unknown spell of errors) at which point powering the modem off/on cleared the cap..
now back to 71 on the ds and it's bee fine since.
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The OP is already capping at 60Mb to try and get DLM to relent.
I think he meant is there any particular reason why you capped at 54Mbps.. ie why you chose 54Mbps to cap at.
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You mean why that particular speed was chosen?
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I'm interested too. Is 55mbps a magical threshold? Not trying to be funny -- it's a well-advertised BT retail "upto" quantity. Was it just plucked out of the air?
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You mean why that particular speed was chosen?
Ahuh... that's how I read the question he was asking.
Jmacp said in his first post "I have manually throttled the connection to 60mb / 20mb to hopefully get speeds up." so he obviously already knows about the use of temporary capping to try get DLM to take action quicker.
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Hi
Let me clarify I was asking why 55mb is there a reason ? Or do you just choose as fast a speed as you think your line will be good at ?
Thanks
John
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The lower the cap, the less ES/FEC the line will have.
There's no specific number to set a cap at.
To shake my interleaving (which had been on the line for 9 months despite being ILQ green for all that time) I had to get my ES down you under 20 per 24 hours.
Your ES are in the single digits so I think your cap is sufficient. Give it 10-11 days from applying the cap to see if interleaving drops.
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Hi
Bit of a strange one..
Got up this morning at the DS and US SNRM DB had both shot up..
I have done 2 restarts but now sync at near enough 80/20 any ideas regard this sudden increase?
xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 31365 Kbps, Downstream rate = 93292 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 79479 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): 6.2 12.5
Attn(dB): 14.6 0.0
Pwr(dBm): 12.7 4.8
VDSL2 framing
Bearer 0
MSGc: 12 150
B: 55 236
M: 1 1
T: 64 5
R: 14 16
S: 0.0224 0.3771
L: 24976 5410
D: 1419 1
I: 70 255
N: 70 255
Counters
Bearer 0
OHF: 11707289 2065149
OHFErr: 3 2
RS: 2247623423 1024381
RSCorr: 45256 15
RSUnCorr: 3 0
Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 1932946746 0
Data Cells: 32171001 0
Drop Cells: 0
Bit Errors: 0 0
ES: 1 1563
SES: 0 0
UAS: 27 313662
AS: 12649
Bearer 0
INP: 3.00 0.00
INPRein: 0.00 0.00
delay: 8 0
PER: 1.08 6.15
OR: 133.27 202.87
AgR: 79612.21 20203.27
Bitswap: 5546/5546 0/0
Total time = 3 hours 31 min 16 sec
FEC: 45256 15
CRC: 3 2
ES: 1 1563
SES: 0 0
UAS: 27 313662
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 15 minutes time = 1 min 16 sec
FEC: 486 0
CRC: 0 0
ES: 0 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: 4851 0
CRC: 0 0
ES: 0 0
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 3 hours 31 min 16 sec
FEC: 45256 15
CRC: 3 2
ES: 1 1563
SES: 0 0
UAS: 27 313662
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 = 3 hours 30 min 49 sec
FEC: 45256 15
CRC: 3 2
ES: 1 1563
SES: 0 0
UAS: 0 313635
LOS: 0 0
LOF: 0 0
LOM: 0 0
#
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So capping worked.
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I dont know TBH still got interleaving on its just the Sync rates have shot up due to much better SNRM values ?
John