Line stats

[dylan]

Hi all,

I've been having a play with my home network and put in a Thomson Speedtouch modem connected to an OpenWRT powered router in full bridge mode (PPPoE client on the router).

I'm not massively up on ADSL statistics though, so I wondered if anyone would cast their eye over these and give me some feedback?   I was a little concerned about the number of errors in the transfer statistics.

Cheers

Dyls

Code:

Modemstate                   :  Up
xDSL Type                    :  ADSL2+
xDSL Standard                :  ITU-T G.992.5
xDSL Annex                   :  Annex A
Uptime (days hh:mm:ss)       :  0 days, 0:07:09

Number of resets             :  1

Total Available Bandwidth           Cells/s           kbit/s
  Downstream                 :     27146            11510
  Upstream                   :      2412             1023

Intrinsic/Actual and Maximum Bandwidth %              kbit/s
  Downstream                 :       101            11396
  Upstream                   :        74             1371

Bearer Generic Info               Downstream        Upstream
INP          (DMT)           :         0.68             0.23
Delay        (ms)            :        10.94             1.73
R                            :         8               16
Margin       (dB)            :         6.0             13.5
Attenuation  (dB)            :        22.5             13.5
OutputPower  (dBm)           :         9.5             10.5

Vendor Chipset                      Local            Remote
  Country                    :        B5               B5
  Vendor                     :      BDCM             BDCM
  VendorSpecific             :      0000             4D54
  StandardRevisionNr         :        00               02
Vendor System
  Country                    :        0F               00
  Vendor                     :      TMMB             ----
  VendorSpecific             :      3C61             0000
  StandardRevisionNr         :        00               00


Transfer statistics
    Errors
      Received FEC           :        52
      Received CRC           :         0
      Received HEC           :         0
      Transmitted FEC        :     50049
      Transmitted CRC        :      8071
      Transmitted HEC        :      9806

     Near end failures since reset
      Loss of frame          :         0 failures
      Loss of signal         :         0 failures
      Loss of power          :         0 failures
      Errored seconds        :        10 seconds  

     Near end failures last 15 minutes
      Loss of frame          :         0 seconds
      Loss of signal         :         0 seconds
      Loss of power          :         0 seconds
      Errored seconds        :        10 seconds

     Near end failures current day
      Errored seconds        :        10 seconds

     Near end failures previous day
      Errored seconds        :         0 seconds

Here's a speedtest too..


And a pingtest (done over wifi)

[GarethG]

The recieve errors are pretty much OK, there are quite alot of transmit errors though. You tried using a different modem? Im not a fan of speedtoutch myself

[dylan]

The link has been up for 4 1/2 hours now. Transmitted errors seem to be holding steady but I'm now seeing a heck of a lot of received errors.

As I understand it, FEC is data which was received with an error but which was auto-corrected (and therefore didn't require retransmission).

    Errors
      Received FEC           :    113560
      Received CRC           :       604
      Received HEC           :       514
      Transmitted FEC        :     50049
      Transmitted CRC        :      8071
      Transmitted HEC        :      9806

[commandergc]

Thats normal when using interlaced mode which KC uses by default, their is nothing to worry about as FEC are corrected errors. I would be alarmed if the CRC errors started climbing rapidly though.

[dylan]

I've given the modem a reboot just to see if it syncs a little slower.

[dylan]

And here are the stats after a reboot. I notice the initial transmission errors are more or less the same so I suppose this must be something that happens as the/after the modem syncs up with the exchange and then gets stops.

Code:

Modemstate                   :  Up
xDSL Type                    :  ADSL2+
xDSL Standard                :  ITU-T G.992.5
xDSL Annex                   :  Annex A
Uptime (days hh:mm:ss)       :  0 days, 0:03:12

Number of resets             :  1

Total Available Bandwidth           Cells/s           kbit/s
  Downstream                 :     26200            11109
  Upstream                   :      2412             1023

Intrinsic/Actual and Maximum Bandwidth %              kbit/s
  Downstream                 :       101            10916
  Upstream                   :        74             1375

Bearer Generic Info               Downstream        Upstream
INP          (DMT)           :         0.71             0.23
Delay        (ms)            :        11.33             1.73
R                            :         8               16
Margin       (dB)            :         6.0             13.5
Attenuation  (dB)            :        22.5             13.5
OutputPower  (dBm)           :         9.5             10.5

Vendor Chipset                      Local            Remote
  Country                    :        B5               B5
  Vendor                     :      BDCM             BDCM
  VendorSpecific             :      0000             4D54
  StandardRevisionNr         :        00               02
Vendor System
  Country                    :        0F               00
  Vendor                     :      TMMB             ----
  VendorSpecific             :      3C61             0000
  StandardRevisionNr         :        00               00


Transfer statistics
    Errors
      Received FEC           :      1880
      Received CRC           :        18
      Received HEC           :        16
      Transmitted FEC        :     50049
      Transmitted CRC        :      8071
      Transmitted HEC        :      9813

     Near end failures since reset
      Loss of frame          :         0 failures
      Loss of signal         :         0 failures
      Loss of power          :         0 failures
      Errored seconds        :        10 seconds

     Near end failures last 15 minutes
      Loss of frame          :         0 seconds
      Loss of signal         :         0 seconds
      Loss of power          :         0 seconds
      Errored seconds        :        10 seconds

     Near end failures current day
      Errored seconds        :        10 seconds

     Near end failures previous day
      Errored seconds        :         0 seconds

[GarethG]

I don't think ill be much help on this one, try taking the router out of the equasion and also plugging the net into the master 'Test' socket if you have one.

Otherwise try another modem with the same setup as above, test point and no router.

The actual line stats seem pretty good, although some modems are better at working at lower dB signals than others. I don't think thats your problem thought?

You could also try asking Karoo to cap your sync speed of both up/down. They usually do line tests before changing this, but if they don't ask them to perform some, just to make sure the line itself is up to their standards.

[dylan]

Hi, thanks for the advice.

To be honest the router is pretty much out of the equation because the reporting comes direct from the modem. This is set up as a full bridge, so all the Thomson has to do is deal with keeping the ADSL up. Speedtouch modems tend to have a good reputation according to Kitz.

Just ran the stats through 'BlueEther's Stats Checker' (pretty cool tool eh?) and here's what they come out with...

According to the extended info from the stats checker "The firmware on your Thompson Speedtouch has a bug in it that miss-represents the FEC up errors, please ignore these errors."

BlueEther's stats checker at http://adsl.tin2tin.net thinks my line is made of pretty standard wiring that could have seen better days.
Can you help me fix my line?

http://adsl.tin2tin.net/yourstats.php?statsID=151892

Please submit your stats with at least 6 hours uptime for the best results.
If your line is too unstable to gain 6 hours then here is an interpretation of the submitted stats:
Down sync is low (56% of the theoretical maximum).
You are on ADSL2+
SN margins vary by too much.
Attenuation looks normal.
The power values are out.
There are some FEC errors.

Code:

Uptime: 0h 17m 41s
Modulation: ADSL2+ - Interleaved on Annex A
(Up Stream) / (Down Stream)
Sync: 1375 / 11072
Data Transferred: /
Attenuation: 13.5 / 22.5
SN Margin: 13.5 / 6
Power: 10.5 / 9.5
Vendor: ---- BDC / TMMB BDC
Modem: TG585v7
LoF: 0 / 0
LoS: 0 / 0
Error Sec.: 0 / 0
FEC: 50049 / 8591
CRC: 8071 / 72
HEC: 0 / 0

[GarethG]

Ahh pretty neat, if you aren't getting new errors after the initial connect errors you shouldn't have any problems. Everything else looks good

[dylan]

Here's the line now...

BlueEther's stats checker at http://adsl.tin2tin.net thinks my line is made of some Welsh hill farmers old fence.
Can you help me fix my line?

http://adsl.tin2tin.net/yourstats.php?statsID=151942

Down sync is low (55% of the theoretical maximum).
You are on ADSL2+
SN margins vary by too much.
Attenuation looks normal.
The power values are out.
There are Lots of FEC errors.
There are CRC errors.

Code:

Uptime: 8h 52m 06s
Modulation: ADSL2+ - Interleaved on Annex A
(Up Stream) / (Down Stream)
Sync: 1367 / 10944
Data Transferred: /
Attenuation: 13.5 / 23
SN Margin: 13 / 5.5
Power: 10.5 / 9.5
Vendor: ---- BDC / TMMB BDC
Modem: TG585v7
LoF: 0 / 0
LoS: 0 / 0
Error Sec.: 0 / 0
FEC: 50054 / 3939525
CRC: 8099 / 54286
HEC: 0 / 0

[miken]

Looks to be syncing pretty slow for the attenuation, I get 15Mbps @ 29 db with ~6 db snr

[dylan]

Looks to be syncing pretty slow for the attenuation, I get 15Mbps @ 29 db with ~6 db snr

What type of modem are you using Miken?

[miken]

Netgear DG834GT (stock Netgear firmware), used it for years could do with something with 802.11n for streaming HD to laptops but most of the computers are on a gigabit wired network.

[Adrian]

Is there anything else plugged in that could be sapping your SNR off?

[dylan]

Just a dect phone. The modem is connected by way of micro filter to the main telephone socket along with that.

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