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Author Topic: Lower than Expected IP Profile  (Read 2867 times)

jaydub

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Lower than Expected IP Profile
« on: February 18, 2021, 11:02:29 PM »

I have an IP Profile of 73.77 on an 80 Mbps sync and pull ~71Mbps on the TBB speed test.  I have no idea why the IP profile is set as low as it is.  Using a Broadcom modem on and ECI cabinet connected  to a BTw backhaul with IDNet.  Any ideas?

Number: 0xxxxxxxxxx
The current Downstream IP profile rate is: 73.77
The current Upstream IP profile rate is: 20
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jaydub

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Re: Lower than Expected IP Profile
« Reply #1 on: March 08, 2021, 12:47:19 PM »

I have just done a TBB speed check and now getting speeds of 74Mbps, so realised my IP profile must have changed.

Just checked the profile out using the Mouselike checker and am pleased to report that my IP profile appears to have been reset to what I think might be expected on an 80/20 line:

Number: 0xxxxxxxxxx
The current Downstream IP profile rate is: 77.42
The current Upstream IP profile rate is: 20

That works out at about 96.8% of the sync speed.

The only thing that I know has changed is that we had a momentary power cut yesterday.  Would that have been enough to reset the lP profile?

It's been stuck on 73.77 since early April 2019, so am slightly intrigued about what has precipitated the change.  Does anybody have any ideas?
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tiffy

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Re: Lower than Expected IP Profile
« Reply #2 on: March 08, 2021, 01:04:06 PM »

Any line re-synch or even a PPP session re-connect for whatever reason has the potential to change BRAS IP profile.
It would appear that DLM has now deemed your line to be currently capable of sustaining G.Inp Re-Tx low profile, hence the approx 97% DS data/synch ratio.
There does not seem to be a definitive opinion as to what criteria DLM applies with respect to DS Re-Tx profile selection but DS FEC error rate appears to be one of the main contenders.
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jaydub

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Re: Lower than Expected IP Profile
« Reply #3 on: March 08, 2021, 09:23:05 PM »

I'm an irregular stats gatherer and speed tester so it appears that my pervious speed test was on 10th February, so quite possibly nothing to do with yesterday's power cut.

Looking back at old stats it looks as though I have been on an INPRein of 0 the whole time I have been on IDNet's BTw backhaul.  I also don't appear to have had any downstream FECs, although I have logged up to ~250 per day on the upstream.

I guess we will have to put this down to the vagaries of DLM.
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tiffy

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Re: Lower than Expected IP Profile
« Reply #4 on: March 09, 2021, 08:52:02 AM »

From the limited stat's you report your line seems almost too good to be true.
80 Mbps DS synch on 80/20 service, very short line to cabinet, zero cross talk?
Zero DS FEC error rate, have never experienced this on the 3 VDSL-2 lines I monitor 24/7.

I try to limit my DS FEC error rate to approx. 10,000 errors/hour (avg. error rate/day) as reported by DSLStats by modem DS speed clamping in order to retain DS G.Inp Re-Tx low profile, found that this was necessary on my 40/10 service.

Assuming a DS synch of 80 Mbps on your line as you are reporting, I can see no other logical reason why your data/synch ratio changed from 92.2% to 96.8% as a result of the last re-synch other than a change of DS G.Inp Re-Tx profile from high to low.
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tubaman

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Re: Lower than Expected IP Profile
« Reply #5 on: March 09, 2021, 10:29:29 AM »

Are you really getting zero DS FECs as I didn't think that was possible in the real world. On a good day mine runs at circa 250k FECS per hour!
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jaydub

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Re: Lower than Expected IP Profile
« Reply #6 on: March 09, 2021, 10:35:08 AM »

Not sure it hasn't suffered from cross talk as the line used to have a max sync rate of about 104 Mbps downstream, which is now down to about 83 Mbps.

By way of comparison, my stats from January:

Code: [Select]
dsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 24119 Kbps, Downstream rate = 84004 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 79987 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):        6.9             9.1
Attn(dB):        6.5             0.0
Pwr(dBm):       -11.7           -11.7

                        VDSL2 framing
                        Bearer 0
MSGc:           18              150
B:              239             236
M:              1               1
T:              23              5
R:              0               16
S:              0.0955          0.3771
L:              20104           5410
D:              1               1
I:              240             255
N:              240             255

                        Counters
                        Bearer 0
OHF:            999266789               1429544
OHFErr:         698             835
RS:             0               499127
RSCorr:         0               4635
RSUnCorr:       0               0

                        Bearer 0
HEC:            2254            0
OCD:            1               0
LCD:            1               0
Total Cells:    810395526               0
Data Cells:     1876953224              0
Drop Cells:     0
Bit Errors:     0               0

ES:             530             547
SES:            0               0
UAS:            29              29
AS:             1652923

                        Bearer 0
INP:            0.00            0.00
INPRein:        0.00            0.00
delay:          0               0
PER:            1.65            6.15
OR:             116.09          202.87
AgR:            80103.09        20203.27

Bitswap:        1969/1969               162/162

Total time = 19 days 3 hours 9 min 12 sec
FEC:            0               4635
CRC:            698             835
ES:             530             547
SES:            0               0
UAS:            29              29
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 9 min 12 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
Previous 15 minutes time = 15 min 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
Latest 1 day time = 3 hours 9 min 12 sec
FEC:            0               40
CRC:            4               9
ES:             3               6
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            0               242
CRC:            33              37
ES:             28              25
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 19 days 3 hours 8 min 43 sec
FEC:            0               4635
CRC:            698             835
ES:             530             547
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0

and from yesterday:

Code: [Select]
adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 24078 Kbps, Downstream rate = 82607 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 79987 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):        6.8             9.0
Attn(dB):        6.6             0.0
Pwr(dBm):       -11.7           -11.7

                        VDSL2 framing
                        Bearer 0
MSGc:           18              150
B:              239             236
M:              1               1
T:              23              5
R:              0               16
S:              0.0955          0.3771
L:              20104           5410
D:              1               1
I:              240             255
N:              240             255

                        Counters
                        Bearer 0
OHF:            75886921                1320617
OHFErr:         49              54
RS:             0               49349
RSCorr:         0               350
RSUnCorr:       0               0

                        Bearer 0
HEC:            157             0
OCD:            0               0
LCD:            0               0
Total Cells:    2125762709              0
Data Cells:     113103767               0
Drop Cells:     0
Bit Errors:     0               0

ES:             41              36
SES:            0               0
UAS:            28              28
AS:             125530

                        Bearer 0
INP:            0.00            0.00
INPRein:        0.00            0.00
delay:          0               0
PER:            1.65            6.15
OR:             116.09          202.87
AgR:            80103.09        20203.27

Bitswap:        119/119         37/37

Total time = 1 days 10 hours 52 min 38 sec
FEC:            0               350
CRC:            49              54
ES:             41              36
SES:            0               0
UAS:            28              28
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 7 min 38 sec
FEC:            0               3
CRC:            1               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:            0               15
CRC:            1               2
ES:             1               1
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 10 hours 52 min 38 sec
FEC:            0               127
CRC:            19              23
ES:             17              16
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 24 hours 0 sec
FEC:            0               223
CRC:            30              31
ES:             24              20
SES:            0               0
UAS:            28              28
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 1 days 10 hours 52 min 9 sec
FEC:            0               350
CRC:            49              54
ES:             41              36
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0

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jaydub

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Re: Lower than Expected IP Profile
« Reply #7 on: March 09, 2021, 10:38:03 AM »

Are you really getting zero DS FECs as I didn't think that was possible in the real world. On a good day mine runs at circa 250k FECS per hour!

I have either got 0 downstream FECs or my VMG1312-B10A is misreporting.

I went through a lot of historical DSLStats data yesterday evening and couldn't see any downstream FECs being reported on any of the stats I looked at.
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tubaman

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Re: Lower than Expected IP Profile
« Reply #8 on: March 09, 2021, 11:19:55 AM »

I have either got 0 downstream FECs or my VMG1312-B10A is misreporting.

I went through a lot of historical DSLStats data yesterday evening and couldn't see any downstream FECs being reported on any of the stats I looked at.

I doubt it's misreporting as they aren't known for that. Clearly a very good line indeed.
 :)
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j0hn

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Re: Lower than Expected IP Profile
« Reply #9 on: March 09, 2021, 12:43:57 PM »

I doubt it's misreporting as they aren't known for that. Clearly a very good line indeed.
 :)

It's a fastpath line.

FEC isn't enabled on the Downstream*

*Unless using a Lantiq chipset modem.
« Last Edit: March 09, 2021, 08:53:02 PM by j0hn »
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jaydub

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Re: Lower than Expected IP Profile
« Reply #10 on: March 09, 2021, 01:19:30 PM »

It's a fastpath line.

FEC isn't enabled on the Downstream.

That would explain it.

I am lucky to live so close to the cabinet, not so lucky in that it is an ECI cabinet and my QLN graph might be considered leas than ideal
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tiffy

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Re: Lower than Expected IP Profile
« Reply #11 on: March 09, 2021, 04:55:53 PM »

Quote
It's a fastpath line.

FEC isn't enabled on the Downstream.

Ahh, didn't know that, never been in a position to monitor a fastpath line.

From your stats, note your DS attenuation is 6.5 dB, the ECI cabinet must be practically beside your residence?
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burakkucat

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Re: Lower than Expected IP Profile
« Reply #12 on: March 09, 2021, 05:22:55 PM »

. . . my QLN graph might be considered leas than ideal

It's not perfect but nor is it bad. I'd call it quite reasonable.

How does the corresponding Hlog plot look for your circuit?
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Alex Atkin UK

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Re: Lower than Expected IP Profile
« Reply #13 on: March 09, 2021, 05:47:54 PM »

It's a fastpath line.

FEC isn't enabled on the Downstream.

That can't be right:
Code: [Select]
Profile: 17a
Trellis: D: ON / U: ON
Bitswap: D: ON / U: ON
G.INP: D: Not Enabled / U: Not Enabled
Virtual Noise Support: D: Not Supported / U: Not Supported
Attain Data Rate: 77.608 Mb/s / 24.456 Mb/s
Actual Data Rate: 67.000 Mb/s / 20.000 Mb/s
Impulse Noise Prot: 0.0 sym / 0.0 sym
Interleave Delay: 0.0 ms / 0.0 ms
NFEC: 255 / 255
RFEC: 16 / 16
LSYMB: 17979 / 5410
Interleave Depth: 1 / 1
Interleave Block: 255 / 255
LPATH: 0 / 0
Line Attenuation: 11.7dB / 13.3dB
Signal Attenuation: 11.8dB / 13.1dB
Noise Margin: 5.5dB / 7.3dB
Transmit power: 13.8dBm / 1.3dBm
FECS: 1248 / 184938
ES: 50 / 20752
SES: 0 / 1
LOSS: 0 / 0
UAS: 57 / 57
HEC: 0 / 0
CRC_P: 0 / 0
CRCP_P: 0 / 0
15m Code Violations: 0 / 0
15m FEC Errors: 0 / 0
1d Code Violations: 3 / 116
1d FEC Errors: 36 / 422
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j0hn

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Re: Lower than Expected IP Profile
« Reply #14 on: March 09, 2021, 08:45:11 PM »

That can't be right:

His stats clearly show it is.

Quote
VDSL2 framing
                        Bearer 0
MSGc:           18              150
B:              239             236
M:              1               1
T:              23              5
R:              0               16

A small amount of FEC on the upstream, none on the downstream.

Only Lantiq chipsets devices add FEC on the downstream on fastpath.
Broadcom and others (Mediatek for 1) do not.

Revised my post above to avoid confusion.
« Last Edit: March 09, 2021, 08:53:58 PM by j0hn »
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Talktalk FTTP 550/75 - Speedtest - BQM
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