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[Ark]

Good evening all

I was wondering if someone could take a look over my stats, and see if I have anything to worry about. I see people talking about low SNRm values and yet mine appears to be uncommonly high. So was wondering if something is wrong, or anything else looks out of the ordinary.

I've been with Vodafone for about a week now (using their supplied router) however I picked up vmg8924 yesterday which I have unbranded and setup thanks to the wonderful information on these forums! Before this I was with BT using a w9980, which had started getting frequent disconnects in the evenings, but since I've been on vodafone and no longer using that router I've not had any disconnects.

I don't have any speed issues, and the connection appears to be stable.

Code: [Select]

Stats recorded 02 Aug 2018 19:48:56

DSLAM type / SW version: BDCM:0xb12d (177.45) / v0xb12d
Modem/router firmware:  AnnexA version - A2pv6F039v.d26a
DSL mode:                VDSL2 Profile 17a
Status:                  Showtime
Uptime:                  1 day 1 hour 50 min 26 sec
Resyncs:                0 (since 02 Aug 2018 19:21:52)

Downstream Upstream
Line attenuation (dB):  9.0 0.0
Signal attenuation (dB): Not monitored
Connection speed (kbps): 79999 20000
SNR margin (dB):        21.2 12.1
Power (dBm):            13.9 -5.7
Interleave depth:        16 1
INP:                    48.00 0
G.INP:                  Enabled Not enabled
Vectoring status:        1 (VECT_FULL)

RSCorr/RS (%):          0.0000 0.0000
RSUnCorr/RS (%):        0.0000 0.0000
ES/hour:                0 1.89

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 = 29707 Kbps, Downstream rate = 134945 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 79999 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):        21.3            12.1
Attn(dB):        9.0             0.0
Pwr(dBm):        13.9           -5.7

                        VDSL2 framing
                        Bearer 0
MSGc:           -6              20
B:              130             239
M:              1               1
T:              0               64
R:              8               0
S:              0.0000          0.3819
L:              21468           5028
D:              16              1
I:              139             120
N:              139             240
Q:              16              0
V:              14              0
RxQueue:                60              0
TxQueue:                15              0
G.INP Framing:          18              0
G.INP lookback:         15              0
RRC bits:               0               24
                        Bearer 1
MSGc:           186             -6
B:              0               0
M:              2               0
T:              2               0
R:              16              0
S:              5.3333          0.0000
L:              48              0
D:              3               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               1500826
OHFErr:         0               97
RS:             2861752256              4090495
RSCorr:         14              0
RSUnCorr:       0               0
                        Bearer 1
OHF:            5792311         0
OHFErr:         0               0
RS:             69506988                0
RSCorr:         0               0
RSUnCorr:       0               0

                        Retransmit Counters
rtx_tx:         16469           0
rtx_c:          3               0
rtx_uc:         0               0

                        G.INP Counters
LEFTRS:         0               0
minEFTR:        79999           0
errFreeBits:    113521168               0

                        Bearer 0
HEC:            0               0
OCD:            0               0
LCD:            0               0
Total Cells:    1428681981              0
Data Cells:     562863655               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:             0               86
SES:            0               2
UAS:            129             129
AS:             93056

                        Bearer 0
INP:            48.00           0.00
INPRein:        0.00            0.00
delay:          0               0
PER:            0.00            6.13
OR:             0.01            33.91
AgR:            80614.82        20033.74

                        Bearer 1
INP:            4.00            0.00
INPRein:        4.00            0.00
delay:          3               0
PER:            16.06           0.01
OR:             95.62           0.01
AgR:            95.62   0.01

Bitswap:        733/1130                496/498

Total time = 1 days 1 hours 53 min 5 sec
FEC:            14              0
CRC:            0               97
ES:             0               86
SES:            0               2
UAS:            129             129
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 8 min 5 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               1
ES:             0               1
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 1 hours 53 min 5 sec
FEC:            0               0
CRC:            0               7
ES:             0               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:            14              0
CRC:            0               90
ES:             0               80
SES:            0               2
UAS:            129             129
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 1 days 1 hours 50 min 55 sec
FEC:            14              0
CRC:            0               97
ES:             0               86
SES:            0               2
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0
 >
Any thoughts? I don't fully understand what I'm looking at so I could be worrying about nothing.

Thanks.

[skyeci]

nice line.. g.inp, full vectoring and maxed out at 79mb.. you must be very very close to the cab, like practically living on top of it...
wish it was my line. lucky you 

[Ark]

nice line.. g.inp, full vectoring and maxed out at 79mb.. you must be very very close to the cab, like practically living on top of it...
wish it was my line. lucky you 

Thanks, I could hit the cab with a shoe from my front door if I were so inclined The line comes in the back of the house though but yes practically on top of it, haha.

[skyeci]

rural cab ?..

you have nothing to worry about I feel. I'm fact I'm jealous lol

[Ark]

Yep, installed in 2016 to move EO lines. The exchange is also practically next to my back garden

This is the first time I've had a proper look at stats for my line, so was just hoping everything is alright. With this new hardware I haven't seen any issues, but the old w9980 was disconnecting practically every evening so was hoping it hadn't caused any problems.

Thank you for your input

[j0hn]

Your SNRM is so high simply because you have lots of spare/headroom.

Max:    Upstream rate = 29707 Kbps, Downstream rate = 134945 Kbps

Those figures and the low 9dB attenuation show you have a very short line.

You have working vectoring also, which is pretty rare in the UK.
We see it mainly on longer rural lines and it will be enabled in your cabinet to increase the speeds of those furthest from the cabinet.

The 80Mb cap OpenReach impose on FTTC means your line won't really appreciate the benefit from vectoring as you're so close to the cabinet you would probably still get the full 80/20 without it.

Do you have a single combined "All In One" fibre cabinet or a separate PCP and FTTC cabinet outside your exchange?
You would no doubt get maximum rates from any future G.Fast rollout.

[johnson]

Given your line has vectoring you also have insurance from crosstalk degrading your sync over time, though I guess the 55mbps of headroom on your attainable probably does that too!

Do you know if you are in a BDUK area, there is a map you can look at here:
https://www.gov.uk/guidance/broadband-delivery-uk

Would be interested to know if you were, or maybe openreach use it on EO line conversions? Just a thought.

[Ark]

Your SNRM is so high simply because you have lots of spare/headroom.

Those figures and the low 9dB attenuation show you have a very short line.

You have working vectoring also, which is pretty rare in the UK.
We see it mainly on longer rural lines and it will be enabled in your cabinet to increase the speeds of those furthest from the cabinet.

The 80Mb cap OpenReach impose on FTTC means your line won't really appreciate the benefit from vectoring as you're so close to the cabinet you would probably still get the full 80/20 without it.

Do you have a single combined "All In One" fibre cabinet or a separate PCP and FTTC cabinet outside your exchange?
You would no doubt get maximum rates from any future G.Fast rollout.

Ah ok, so high snrm is nothing to worry about It's a separate PCP and FTTC cab, I was expecting an AIO style when they started work but there are two separate enclosures.

Given your line has vectoring you also have insurance from crosstalk degrading your sync over time, though I guess the 55mbps of headroom on your attainable probably does that too!

Do you know if you are in a BDUK area, there is a map you can look at here:
https://www.gov.uk/guidance/broadband-delivery-uk

Would be interested to know if you were, or maybe openreach use it on EO line conversions? Just a thought.

Yes, my area was upgraded under the Fastershire project.

Thanks for the input both, nice to know it appears I have nothing to worry about either now or possibly in the future!

[johnson]

Ah thanks for the info!

I also have vectoring but on a long crappy line, get around 27mbps on a good day.

I guess you have not had any disconnections since you got the VMG8924 as its only been a day, and you are not likely to get one for some time if at all given how high your SNRM is, but... After vectoring was enabled on my line and when using VMG8324/8924 or VMG1312s with any of the later firmware versions I experienced this odd behaviour when a "hot" reconnect i.e. a disconnect either due to noise or DLM changes that was not accompanied by a modem reboot happened, where it would sync at near enough exactly half of what it was at previously, so from 26mbps to 13mpbs. The attainable after these strange resyncs would also halve. It was like the modem was suddenly only seeing half of the available bins/frequencies/phase angles or something, this would also be accompanied by the vectoring stats in DSLStats going up by exactly half for the "statuses sent" eg from symetrical like this:

Total error samples Ethernet pkts sent: 149762
Total error samples Ethernet pkts discarded: 0
Total error samples statuses sent: 149762
Total error samples statuses discarded: 0

to this:

Total error samples Ethernet pkts sent: 80447
Total error samples Ethernet pkts discarded: 0
Total error samples statuses sent: 62301
Total error samples statuses discarded: 0

A power cycle of the router and the new sync would immediately go back to the normal full speed.

I eventually found a solution to this with the zyxel modems by including a newer dsl_phy.bin from a different modem.

So if you ever get a sync like this at half your normal speed don't panic, a modem reboot will fix it.

If you ever feel brave and want to test if this happens with all vectored lines on these modems (as I said I have tried 8324/8924 & 1312) you could by pulling the phone cable from the modem and forcing a resync without rebooting the modem. Though I totally understand if you never felt the need.