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Author Topic: Please help with interpreting my line stats  (Read 924 times)

zimmerling

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Please help with interpreting my line stats
« on: September 12, 2021, 11:08:02 AM »

I have been having problems with getting stable and consistent sync speeds for some time.

After contacting my ISP and a subsequent visit from Openreach engineer on 20 July, my download (not sync) speeds varied between 30 - 37 Mbps up until late August. Since then the sync speed has fallen back to 27 Mbps (download speed around 24 Mbps). Prior to the engineer's visit I was getting 15 Mbps.

Things are obviously better than they were at the start of the summer, but I'm wondering why the improvement I experienced during late July and August has not been maintained.

I have recently swapped out my OR supplied ECI modem for a Hauwei HG612 in order that I can get some stats (thanks to Kitz et al for making this possible).

I haven't yet got to grips with understanding the stats and would be grateful for any help and advice.

Code: [Select]
xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 6964 Kbps, Downstream rate = 38972 Kbps
Bearer: 0, Upstream rate = 6964 Kbps, Downstream rate = 32399 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 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): 8.6 6.0
Attn(dB): 23.9 0.0
Pwr(dBm): 12.3 1.2
VDSL2 framing
Bearer 0
MSGc: -6 26
B: 65 207
M: 1 1
T: 0 41
R: 6 6
S: 0.0640 0.9485
L: 9007 1805
D: 8 1
I: 72 107
N: 72 214
Q: 8 0
V: 6 0
RxQueue: 136 0
TxQueue: 34 0
G.INP Framing: 18 0
G.INP lookback: 31 0
RRC bits: 0 24
Bearer 1
MSGc: 90 -6
B: 0 0
M: 2 0
T: 2 0
R: 16 0
S: 10.6667 0.0000
L: 24 0
D: 1 0
I: 32 0
N: 32 0
Q: 0 0
V: 0 0
RxQueue: 0 0
TxQueue: 0 0
G.INP Framing: 0 0
G.INP lookback: 0 0
RRC bits: 0 0
Counters
Bearer 0
OHF: 0 170370
OHFErr: 0 5
RS: 1148472328 422570
RSCorr: 3831 4
RSUnCorr: 0 0
Bearer 1
OHF: 1147641 0
OHFErr: 0 0
RS: 6885479 0
RSCorr: 4 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 177068525 0
rtx_c: 4753 0
rtx_uc: 72144 0

G.INP Counters
LEFTRS: 12 0
minEFTR: 32391 0
errFreeBits: 163005826 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 1148515653 0
Data Cells: 1072453 0
Drop Cells: 0
Bit Errors: 0 0

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

ES: 12 139
SES: 10 0
UAS: 55 45
AS: 18434

Bearer 0
INP: 51.00 0.00
INPRein: 1.00 0.00
delay: 0 0
PER: 0.00 9.75
OR: 0.01 26.22
AgR: 32897.16 6990.26

Bearer 1
INP: 2.50 0.00
INPRein: 2.50 0.00
delay: 0 0
PER: 16.06 0.01
OR: 47.81 0.01
AgR: 47.81 0.01

Bitswap: 14186/14186 13/14

Total time = 1 days 8 hours 16 min 25 sec
FEC: 58728 1557
CRC: 564 151
ES: 12 139
SES: 10 0
UAS: 55 45
LOS: 1 0
LOF: 9 0
LOM: 0 0
Latest 15 minutes time = 1 min 25 sec
FEC: 5 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: 272 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 = 8 hours 16 min 25 sec
FEC: 5817 16
CRC: 562 12
ES: 10 11
SES: 10 0
UAS: 32 22
LOS: 1 0
LOF: 9 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 27170 1006
CRC: 2 81
ES: 2 76
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 5 hours 7 min 13 sec
FEC: 3831 4
CRC: 0 5
ES: 0 5
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0

[Moderator edited to wrap the statistics with [code][/code] tags.]
« Last Edit: September 12, 2021, 11:33:43 PM by burakkucat »
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g3uiss

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Re: Please help with interpreting my line stats
« Reply #1 on: September 12, 2021, 12:52:18 PM »

Your sync speed shows 32(799) not 27 ?
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tubaman

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Re: Please help with interpreting my line stats
« Reply #2 on: September 12, 2021, 01:54:03 PM »

I assume a Huawei cabinet as G.INP is active on the DS side.
I am wondering if, with a sync speed of 32399 and SNR 8.6, it's banded?
If you do a single resync does it sit at the exact same sync speed again, as that would confirm it?
 :)
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zimmerling

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Re: Please help with interpreting my line stats
« Reply #3 on: September 12, 2021, 06:26:41 PM »

Your sync speed shows 32(799) not 27 ?

You are quite right. Sorry about that. Last night the sync was 27. I ran the stats again just before posting earlier and, as I was in a hurry to go out, didn't think to check whether there had been any change.
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zimmerling

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Re: Please help with interpreting my line stats
« Reply #4 on: September 12, 2021, 06:37:12 PM »

I assume a Huawei cabinet as G.INP is active on the DS side.
I am wondering if, with a sync speed of 32399 and SNR 8.6, it's banded?
If you do a single resync does it sit at the exact same sync speed again, as that would confirm it?
 :)


Yes Huawei cabinet is about 700 metres away (approx 1.7 km to exchange as crow flies).

In the last three days I made two attempts at re-sync - the first I powered the modem down for approx 15 mins; the second I powered down for 60 minutes. On both occasions it re-synced at the same speed (i.e. 27 Mbps).

The uptick in sync overnight was not prompted by a resync attempt by me. Had I noticed the improvement, I would have held off posting.

I've probably run short of patience in the last few months and had assumed that my sync was going back down to where it started earlier in the summer (i.e. around 15 Mbps). If sync were to settle at 32, I'd be content.

Grateful for your input and g3uiss.


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spudgun

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Re: Please help with interpreting my line stats
« Reply #5 on: September 12, 2021, 09:37:05 PM »

I'd recommend leaving the line alone for a while and letting the line management do its thing.

Repost the stats next weekend and we'll have a better idea of what has happened over the last 7 days.

If the line is stable after a while, the line management might lower your SNR and you could get more speed.

Avoid temptation to reset etc. and it will be possible to offer a more informed opinion on what we are seeing next week.
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RealAleMadrid

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Re: Please help with interpreting my line stats
« Reply #6 on: September 13, 2021, 07:40:16 AM »

It does look like the line is banded at 32.4Mbps, so without CP intervention to request a DLM reset the speed is unlikely to change in the near future. Banding can be hard to get rid of once it has been applied, there could be a very long wait for DLM to remove it. :(
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zimmerling

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Re: Please help with interpreting my line stats
« Reply #7 on: September 13, 2021, 08:59:51 AM »

Thanks Spudgun and RealAleMadrid.

As suggested, I will repost line stats at the end of next weekend.

FYI ....

My FTTC service is advertised as "average download speed of 36 Mb" - I think a 'faster' service is available (subject to availability / line conditions). Until I raised a support call with my ISP this summer, my speeds had always been well below the advertised average and the advertised 'guaranteed minimum' for the service.

I'm not in the habit of re-syncing the connection. I have done it only three times this summer. The first occasion was back in July when I replaced my router. More recently (on 8th Sept) I swapped out the ECI modem for the Huawei model and disconnected for 15 minutes. When I noticed just over 24 hours later that sync was at exactly the same speed as before the modem swap, I decided to disconnect again - this time for an hour. On reconnecting the sync speed was again as before (27 Mbps). A further 24 hours later the connection / sync speed had been reset to 32 Mbps without any intervention on my part.

On the issue of banding and resets, when the OR engineer came in July he said that he had 'reset' my line. For a month after this, I was getting download speeds (not sync - on ECI modem so line stats) of between 30 and 37 Mbps. When the speed dropped in mid-August my ISP said that there was a 'line profile mismatch' and that they were asking OR to correct this - not at all clear what this meant, but it seemed to have little or no impact, which is why I ended up on Kitz.
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Alex Atkin UK

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Re: Please help with interpreting my line stats
« Reply #8 on: September 13, 2021, 05:12:31 PM »

It does look like the line is banded at 32.4Mbps, so without CP intervention to request a DLM reset the speed is unlikely to change in the near future. Banding can be hard to get rid of once it has been applied, there could be a very long wait for DLM to remove it. :(

Moreover, it seems much MUCH harder to get rid of on ECI rather than Huawei.  Both my lines are banded now for no obvious reason, my Zen line in particular has always been rock-solid stable.  Though to be fair, they are both banded at a point where 6dB SNRm is achieved, but I can't manually push them lower.  Makes me wonder if on ECI they consider going below 6dB as a reason to band the line.
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burakkucat

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Re: Please help with interpreting my line stats
« Reply #9 on: September 13, 2021, 05:24:25 PM »

My FTTC service is advertised as "average download speed of 36 Mb" . . .

That will be based upon either the Openreach 40/10 Mbps or the Openreach 55/10 Mbps product.

As an example, here follows the first 19 lines of the statistics for my FTTC service which is based on the Openreach 40/10 Mbps product --

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 = 15603 Kbps, Downstream rate = 44311 Kbps
Bearer: 0, Upstream rate = 9997 Kbps, Downstream rate = 40000 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 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):        7.5             9.2
Attn(dB):        16.3            0.0
Pwr(dBm):        13.3            7.1

<snip>

Notice how the downstream and upstream SNRM are both greater than the 6 dB target, the Bearer 0 line shows the circuit is synchronised at 40/9.9 Mbps and the Max line (which is just an estimate) shows the circuit could "give a little bit more".
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zimmerling

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Re: Please help with interpreting my line stats
« Reply #10 on: September 20, 2021, 11:26:43 AM »

As spudgun suggested, I am reposting my stats.

As far as I can see, nothing much has changed and my download (not sync) speeds seem to have settled at around 23 Mbps. This is much lower than the advertised average of 36 Mbps and slower than the 30 - 37 Mbps that I was getting for around 5 weeks in mid summer. However, it is just a little above the minimum guaranteed speed set by the ISP.

Code: [Select]
xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 1
Last initialization procedure status: 0
Max: Upstream rate = 6964 Kbps, Downstream rate = 38844 Kbps
Bearer: 0, Upstream rate = 6964 Kbps, Downstream rate = 32399 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 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): 8.5 6.0
Attn(dB): 23.9 0.0
Pwr(dBm): 12.3 1.2
VDSL2 framing
Bearer 0
MSGc: -6 26
B: 65 207
M: 1 1
T: 0 41
R: 6 6
S: 0.0640 0.9485
L: 9007 1805
D: 8 1
I: 72 107
N: 72 214
Q: 8 0
V: 6 0
RxQueue: 136 0
TxQueue: 34 0
G.INP Framing: 18 0
G.INP lookback: 31 0
RRC bits: 0 24
Bearer 1
MSGc: 90 -6
B: 0 0
M: 2 0
T: 2 0
R: 16 0
S: 10.6667 0.0000
L: 24 0
D: 1 0
I: 32 0
N: 32 0
Q: 0 0
V: 0 0
RxQueue: 0 0
TxQueue: 0 0
G.INP Framing: 0 0
G.INP lookback: 0 0
RRC bits: 0 0
Counters
Bearer 0
OHF: 0 1558236
OHFErr: 37 690
RS: 1895638760 3095648
RSCorr: 1536058 1699
RSUnCorr: 0 0
Bearer 1
OHF: 44810521 0
OHFErr: 0 0
RS: 268862755 0
RSCorr: 599 0
RSUnCorr: 0 0

Retransmit Counters
rtx_tx: 177156724 0
rtx_c: 67242 0
rtx_uc: 72249 0

G.INP Counters
LEFTRS: 51 0
minEFTR: 32391 0
errFreeBits: 509459985 0

Bearer 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 1894975197 0
Data Cells: 306962692 0
Drop Cells: 0
Bit Errors: 0 0

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

ES: 25 768
SES: 10 0
UAS: 55 45
AS: 719787

Bearer 0
INP: 51.00 0.00
INPRein: 1.00 0.00
delay: 0 0
PER: 0.00 9.75
OR: 0.01 26.22
AgR: 32897.16 6990.26

Bearer 1
INP: 2.50 0.00
INPRein: 2.50 0.00
delay: 0 0
PER: 16.06 0.01
OR: 47.81 0.01
AgR: 47.81 0.01

Bitswap: 541564/541588 1931/1944

Total time = 1 days 11 hours 5 min 38 sec
FEC: 1590955 3252
CRC: 601 836
ES: 25 768
SES: 10 0
UAS: 55 45
LOS: 1 0
LOF: 9 0
LOM: 0 0
Latest 15 minutes time = 5 min 38 sec
FEC: 484 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: 1233 0
CRC: 0 1
ES: 0 1
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Latest 1 day time = 11 hours 5 min 38 sec
FEC: 85109 18
CRC: 2 17
ES: 1 17
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Previous 1 day time = 24 hours 0 sec
FEC: 241857 902
CRC: 11 70
ES: 4 63
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0
Since Link time = 8 days 7 hours 56 min 27 sec
FEC: 1536058 1699
CRC: 37 690
ES: 13 634
SES: 0 0
UAS: 0 0
LOS: 0 0
LOF: 0 0
LOM: 0 0

[Moderator edited to wrap the data with [code][/code] tags.]
« Last Edit: September 20, 2021, 05:07:20 PM by burakkucat »
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Weaver

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Re: Please help with interpreting my line stats
« Reply #11 on: September 20, 2021, 12:52:39 PM »

Downstream SNRM is high, hence the slowness, some noise being picked up.
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RealAleMadrid

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Re: Please help with interpreting my line stats
« Reply #12 on: September 20, 2021, 02:27:58 PM »

@zimmerling. The line is still banded at 32.4Mbps, with that sync speed your download throughput should be around 91% of that figure as you are on Re-tx high, the higher level of G.Inp error correction. So you should be getting about 29.4 Mbps not 23Mbps which is rather low.
Have you contacted your CP (ISP) about the banding.

@Weaver the SNRM is high because the line is capped at 32.4 Mbps if the banding was removed it would sync at a higher speed.
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spudgun

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Re: Please help with interpreting my line stats
« Reply #13 on: September 20, 2021, 06:42:55 PM »

The good news - the line seems stable at its current settings as there have been no dropouts during the week.

DLM shows no sign of doing anything (on a normal line you might have expected it to have picked up on the stability and tried dropping the SNR to see if it could get more speed and maintain stability). Of course, DLM could have decided long ago that this is the best profile for your line as it is unstable if it goes lower on the SNR.

I would entirely agree that the line is stuck on 'banded' at its current levels and only way to address this is now to speak with your ISP to see what they can do about getting the DLM reset to see if that fixes things. It is possible, of course, that you will end up exactly where you are now as there may be something in your external line conditions or internal wiring that causes instability at higher speeds, but you have got nothing to lose by speaking with your ISP.
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zimmerling

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Re: Please help with interpreting my line stats
« Reply #14 on: September 20, 2021, 07:01:30 PM »

I raised a ticket with my ISP back in June when speed (download) was just below 15 Mbps.

Since that ticket was opened there has been an Openreach engineer's visit in July. He stripped an old  junction box of its terminal board / pcb and bonded the incoming line directly to the line that feeds the master socket. He also reported that he had reset the line (which I assume meant that he had reset the DLM).

Following this visit I had download speeds in excess of 30 Mbps for over a month. Then the speed started to drop again. I reported back to the ISP and they said that the incorrect line profile had been applied to the service and that they would ask Openreach to correct this. This was duly done but I have seen no improvement.

The ticket is still open with the request from the ISP to me to monitor line and report back any issues. That was three weeks ago. Since then I swapped out the ECI modem for the Huawei so that I could get some stats rather than just relying on download speeds. Having got the Huawei running, I came here for advice.

It looks like I need to go back to the ISP and request a DLM reset, although I'm not sure what I can say to support that request. One difficulty I have with them is that the download speed is now just about at the minimum guaranteed level (i.e. they may say that the line is running within specified limits).


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