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FTTC stats

Community Veteran
Posts: 1,606
Thanks: 20
Registered: 29-06-2010

FTTC stats

Hi
I've had FTTC since 28/5/14. The Quinn's installer who fitted it said I was first on the cabinet, so I have to assume a number of new users since then may have impacted my service, but it does not appear that I am getting my full capacity downstream. The installer had great difficulty getting a line test - took 14 tries to get a result, which was 68.something down. I was delighted by that - my ADSL service had been somewhat flaky, and I'm aware that my cabinet is a fair distance away.
Estimated and current line speeds from the member centre:
Estimated line speed:
    69Mb (Download speed could vary depending on line conditions. Estimates are the maximum speeds that your phone line can support. These speeds are dependent on the package you choose.) - Checked on 2014-05-03 02:03:00
Current line speed:
    54.2 Mb
BTW speedtester attached.
Screenshot of Modem Stats also attached. Over 500 million FEC errors in 5 days - is that excessive? I've no idea, but on the face of it certainly seems so. The other figures that concern me is the attainable rate vs. the synch rate - how can there be more than 8000Kbps of a difference?
The connection stays up for days at a time as opposed to when I was on ADSL and connection was dropping sometimes several times a day. I have a theory about that...
Here in Inverness they are installing flood alleviation measures along the banks of the River Ness. This has meant extensive road works and road closures over the last couple of years. Guess which route my line takes from the exchange to the cab?  Undecided
I suspect that may have been the source of my ADSL performance dropping from on average 16Mbps to about 12Mbps over the same sort of period.
At the moment, I'm not looking to treat this as a fault, but I would like to see the results of a GEA test, such as I've seen on other threads, so I can confirm the figures produced by HG612 stats. [1]
[1] I've also got a thread open on he Kitz forums about this, but Bald_Eagle, presumably a very busy Haliaeetus leucocephalus, hasn't yet replied to my posting from a couple of days ago, hence my bringing this here.
(And in any case, Bald Eagles can't get me a GEA test... )
32 REPLIES
Community Veteran
Posts: 1,606
Thanks: 20
Registered: 29-06-2010

Re: FTTC stats

Oops - forgot the second attachment...
xreyuk
Grafter
Posts: 231
Registered: 23-05-2014

Re: FTTC stats

Attainable rate vs sync rate is normal.
My attainable rate is 50Mbps, but I get around 46Mbps maximum. Why? DLM. Max attainable is a calculation based on what the router can see about your line. Various stats such as attenuation etc will allow it to calculate max attainable. However, your line attenuation is different to your signal attenuation, as signal attenuation is interference. If you can login to the HG612 modem via telnet, you can run a couple of commands to find out more information.
If you're willing to give that a go, we can have a more in depth look?
I'd take a look at the BT estimator now, and see what your line estimate is. On the face of it, it looks as though you should be getting higher speeds. You can check here https://www.dslchecker.bt.com. Plusnet last checked your line in May, so it's possible that BT have change their estimate because more people have jumped on the cabinet.
Even if more people have jumped on the cabinet, your throughput on the tester is far lower than your IP Profile. Did you do the test via Ethernet or WiFi?
Community Veteran
Posts: 1,606
Thanks: 20
Registered: 29-06-2010

Re: FTTC stats

The BTw estimate is still the same and the attachment is from a check taken on 17th May, before I upgraded.
All testing via ethernet.
What telnet commands do you want me to try?
Community Veteran
Posts: 6,824
Thanks: 1
Registered: 27-10-2012

Re: FTTC stats

Didn't you have problems with your line and ADSL also?
Community Veteran
Posts: 1,606
Thanks: 20
Registered: 29-06-2010

Re: FTTC stats

Yes, but the FTTC connection is far more stable - the only drops I get now are when I initiate them myself, for example when I upgraded the modem firmware about a week ago. I was suspicious of the D side at first, but now the E side is fibre I'm much more suspicious that the cause of my previous woes was the flood defence works mentioned in my OP causing me E side problems instead...
xreyuk
Grafter
Posts: 231
Registered: 23-05-2014

Re: FTTC stats

If you can telnet in, can you try the 2 following commands:
xdslcmd info --show
xdslcmd info --pbParams
Community Veteran
Posts: 1,606
Thanks: 20
Registered: 29-06-2010

Re: FTTC stats

Here goes - make of it what you will...
Welcome Visiting Huawei  Home Gateway
Copyright by Huawei Technologies Co., Ltd.
Login:admin
Password:
ATP>sh
#
BusyBox v1.9.1 (2013-06-01 18:30:08 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.
# xdslcmd info --show
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status:  0
Max:    Upstream rate = 16400 Kbps, Downstream rate = 62048 Kbps
Bearer: 0, Upstream rate = 16396 Kbps, Downstream rate = 56125 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):        5.3            5.9
Attn(dB):        21.4            0.0
Pwr(dBm):        12.3            6.4
                        VDSL2 framing
                        Bearer 0
MSGc:          18              23
B:              51              237
M:              1              1
T:              64              64
R:              12              16
S:              0.0295          0.4618
L:              17368          4400
D:              1099            1
I:              64              127
N:              64              254
                        Counters
                        Bearer 0
OHF:            279361551      1222912
OHFErr:        6955            147
RS:            2796946365      38928
RSCorr:        641423969      980
RSUnCorr:      476268          0
                        Bearer 0
HEC:            117380          0
OCD:            3026            0
LCD:            3026            0
Total Cells:    1269400538      0
Data Cells:    214005673      0
Drop Cells:    0
Bit Errors:    0              0
ES:            829            140
SES:            1              0
UAS:            3786            3786
AS:            529129
                        Bearer 0
INP:            3.00            0.00
INPRein:        0.00            0.00
delay:          8              0
PER:            1.89            7.41
OR:            101.36          31.27
AgR:            56226.36        16427.16
Bitswap:        356578/356578  26995/26995
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status:  0
Max:    Upstream rate = 16407 Kbps, Downstream rate = 61876 Kbps
Bearer: 0, Upstream rate = 16396 Kbps, Downstream rate = 56125 Kbps
Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3959)
Medley Phase (Final) Band Plan
US: (7,32) (871,1205) (1972,2776)
DS: (33,859) (1216,1961) (2793,3695)
                  VDSL Port Details Upstream                Downstream
Attainable Net Data Rate:          16407 kbps              61876 kbps
Actual Aggregate Tx Power:            6.4 dBm              12.3 dBm
====================================================================================
        VDSL Band Status                U0              U1              U2              U3              U4              D1              D2
D3
  Line Attenuation(dB):  6.0    33.9    51.4    N/A    N/A    16.2    43.1    66.3
Signal Attenuation(dB):  6.0    33.0    50.6    N/A    N/A    18.0    42.8    66.8
                SNR Margin(dB):  5.9    5.9    5.9      N/A    N/A    5.1    5.1    5.1
                TX Power(dBm): -3.9    -8.0    6.0      N/A    N/A    9.1    7.8    4.4
xreyuk
Grafter
Posts: 231
Registered: 23-05-2014

Re: FTTC stats

Thanks mate
Looking at that, you're on a pretty high interleaving level on your downstream. If you look at the 'D', that shows interleaving, and 1099 is a pretty high, 1 (like shown in your upstream) is the fast path setting. You have a standard level of Impulse Noise Protection (INP), which is put on to try and reduce noise on the line, so it's possible you may have a small level of noise from somewhere. The 'delay' of 8 on the downstream is an 8ms delay.
Your error counts on the downstream are low, and so are your errored seconds (ES) compared to your available seconds (AS). Your unavailable seconds (UAS) is quite high however, that number should be a lot lower, that is beyond my skills, and might be worth a hop over to the kitz forum with these stats.
Your line is pretty much operating at the highest speed it will as you can see by your SNR values of 5.3dB downstream, and 5.9dB upstream (it'll aim for 6dB).
Looking at your line attenuation compared to signal attenuation, there is something causing a bit of noise on your DS 1 (downstream) channel. Your line attenuation is 16.2dB but your signal is 18dB.
If you go over to kitz forums, they'll be able to give you more information such as the DSLAM you're connected to, and whether you can access all of the upstream/downstream channels.
Your stats look pretty okay to me, your 'unstableness' is not being cause by the router disconnecting and reconnecting as your AS shows an uptime of 6 days. Something else is causing your slow speeds on the speed tester, as those results are definitely not right.
For future reference, if the 'retrain reason' is 0, it usually means a genuine resync, or router reboot. If it's 1, it's a resync triggered by DLM.
Community Veteran
Posts: 1,606
Thanks: 20
Registered: 29-06-2010

Re: FTTC stats

Cheers for that - the info is very comprehensive, it's just a pity there are so many TLAs (and OLAs!) and I now feel enlightened, at least as to AS and UAS...
I've already got a thread going on the Kitz Forum where I'm getting some sage advice, so armed with all of this can I repeat my request to the Digital Care Team for a GEA test, please?
TIA...  Cool
Plusnet Staff
Plusnet Staff
Posts: 6,346
Thanks: 31
Fixes: 5
Registered: 26-11-2011

Re: FTTC stats

Sure - the detail is attached to this post.
Chris Pettitt
Cloud Environments Engineer
Community Veteran
Posts: 1,606
Thanks: 20
Registered: 29-06-2010

Re: FTTC stats

Thanks for that Chris. Didn't expect a reply on this till Monday - doing a spot of overtime?
Anyone know what Egress and Ingress Code Violations are, and if they might indicate a problem?
I'm still getting red speedtest reults from BTw - should I raise a speed fault?
Plusnet Staff
Plusnet Staff
Posts: 6,346
Thanks: 31
Fixes: 5
Registered: 26-11-2011

Re: FTTC stats

The 'Egress/Ingress Code Violations' are very similar to errors that are seen on ADSL circuits. The problem is, we can't see why the line might be erroring, for example, we can't see your 'Mean Time Between Errors' to try and gauge how often the errors are occuring.
We're pushing for a report from our suppliers which would provide us with 15 minute updates for FTTC lines which would help us identify trends, especially important for fault finding. In my opinion, I'd raise a fault as you're seeing errors on the lien which is the likely cause for the lower sync.
Chris Pettitt
Cloud Environments Engineer
Community Veteran
Posts: 1,606
Thanks: 20
Registered: 29-06-2010

Re: FTTC stats

Thanks Chris - I've raised Question #88558206, but it gives
Broadband Troubleshooter error
There's been a problem with our automated troubleshooting process.
Don't worry, our Faults Team will investigate it and be in touch. We'll aim to contact you within 24 hours.
[INTERNAL]Failure of Circuit Check
amongst other notes.
I await the test results with bated breath...
Plusnet Staff
Plusnet Staff
Posts: 6,346
Thanks: 31
Fixes: 5
Registered: 26-11-2011

Re: FTTC stats

There aren't any weekend engineers available unfortunately, I've passed you the ticket back for your further availability.
Chris Pettitt
Cloud Environments Engineer