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Too slow, or just being greedy?

JackHennety
Newbie
Posts: 8
Registered: 23-01-2013

Too slow, or just being greedy?

I posted a question to PN about this, which I've since closed accepting their reasoning but it still bugs me.  I got fibre 80/20 in Feb, and for 6 glorious weeks or so had a PN profile of 78Mb, which delivered speed tests from various places of 70-74Mb.  Great.  Then one weekend in March I was mucking around moving things and turned the modem off 2 or 3 times within a fairly short period.
From that point on, the speed tests dropped by around 10Mb, so the best I ever get now is 64Mb.  A BTW test shows a profile of 69.61Mb; Plusnet's profile dropped to 68.2 where it's stayed since.  It's now 3 or 4 weeks since those modem restarts, so if it were DLM related I'd have though it'd have gone back to 'normal' by now.
Modem stats are as follows (on an up time of ~22hrs):
Attainable down/up:     84388     29854
SNR margin down/up: 6.2     15.1
Line Attenuation:     0     0   (yes, it says 0, even using xdslcmd via telnet - weird, though I am only a matter of a couple of hundred paces from the cabinet)
Line Rate:     71915     20000
CRC Errors:  20664
FEC Errors:     830
HEC Errors:     5149  
My Plusnet profile is "40M-80M Downstream, Interleaving Low - 10M-20M Upstream, Interleaving Off" according to their test data of 30th March, which was alongside a RADIUS graph.
Could the drop just be contention?  Is the drop happening at the same time I reset the modem a coincidence?
I know 64Mb is still pretty good, it's just a disappointment when I know it was better.  Tell me it all looks normal and I'll try and stop obsessing over it  Grin  
6 REPLIES
Bald_Eagle1
Grafter
Posts: 313
Registered: 24-06-2011

Re: Too slow, or just being greedy?

Quote from: JackHennety

Modem stats are as follows (on an up time of ~22hrs):
Attainable down/up:     84388     29854
SNR margin down/up: 6.2     15.1
Line Attenuation:     0     0   (yes, it says 0, even using xdslcmd via telnet - weird, though I am only a matter of a couple of hundred paces from the cabinet)


Try xdslcmd info --pbParams (the 2nd 'P' is intentionally upper case).
That will confirm Line & Signal attenuation per band:-

xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 2
Max: Upstream rate = 5646 Kbps, Downstream rate = 30460 Kbps
Path: 0, Upstream rate = 5646 Kbps, Downstream rate = 25845 Kbps
Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3959)
Medley Phase (Final) Band Plan
US: (0,95) (868,1207)
DS: (32,859) (1216,1963)
      VDSL Port Details      Upstream        Downstream
Attainable Net Data Rate:      5646 kbps        30460 kbps
Actual Aggregate Tx Power:        6.3 dBm          12.5 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB): 8.2 52.8   N/A   N/A 21.5 62.9 0.1
Signal Attenuation(dB): 8.2 52.0   N/A   N/A 21.5 62.9   N/A
        SNR Margin(dB): 6.2 6.0   N/A   N/A 6.2 6.5   N/A
        TX Power(dBm): -4.1 5.8   N/A   N/A 11.3 6.4   N/A



xdslcmd info --stats will give you lots of other info, such as 'true' FEC/CRC error counts (the modem's GUI mis-reports them), interleaving depth etc. etc. etc.
Community Veteran
Posts: 1,258
Thanks: 20
Fixes: 3
Registered: 22-06-2012

Re: Too slow, or just being greedy?

These are my speeds & I'm more than happy. Smiley


I can't believe that your quality of life will suffer over the loss of a couple of Mbs. Just remember dial up!!  Undecided
JackHennety
Newbie
Posts: 8
Registered: 23-01-2013

Re: Too slow, or just being greedy?

Quote from: tijara33
I can't believe that your quality of life will suffer over the loss of a couple of Mbs. Just remember dial up!!  Undecided

Just say it: you're being greedy  Smiley
Bald_Eagle1: Thanks for that.  That did give me a sensible attenuation I think (because I'm not entirely sure how to interpret this; feel free to enlighten me as to whether there's anything at all in the stats I posted that doesn't look normal):
      VDSL Port Details      Upstream        Downstream
Attainable Net Data Rate:      29834 kbps        82336 kbps
Actual Aggregate Tx Power:        6.8 dBm          13.1 dBm
============================================================================
  VDSL Band Status        U0      U1      U2      U3      D1      D2      D3
  Line Attenuation(dB):  4.4    20.8    30.7    N/A    11.1    25.8    39.3
Signal Attenuation(dB):  4.4    20.0    29.7    N/A    11.1    25.8    39.3
        SNR Margin(dB):  15.1    15.1    15.1    N/A    5.7    5.7    5.3
        TX Power(dBm): -4.4    -23.2    6.4      N/A    9.7    7.6    7.0
Community Veteran
Posts: 5,472
Thanks: 292
Fixes: 4
Registered: 11-08-2007

Re: Too slow, or just being greedy?

JackHennety
Newbie
Posts: 8
Registered: 23-01-2013

Re: Too slow, or just being greedy?

Grin
Community Veteran
Posts: 1,258
Thanks: 20
Fixes: 3
Registered: 22-06-2012

Re: Too slow, or just being greedy?

Nice one Purleigh!!  Grin