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Author Topic: Lots of TCP transmissions and a few Drops  (Read 1853 times)

jam3s

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  • Posts: 1
Lots of TCP transmissions and a few Drops
« on: March 13, 2012, 10:02:14 AM »

Hello All

I seem to be having experiencing alot of TCP retransmissions and small drops out in the middle of VoIP calls. I dont think there is any congestion as I have removed all computer from the link and I am still having the small drops within my calls. (the calls dont disconnect).   

I have just looked at my DSL statistics and I can see a lot of errors, Are these errors just normal or quite high?

Thanks for any help,

James

Physical Layer Statistics:

  Modem state:                                   up
  Up time (Days hh:mm:ss):                       0 days, 15:54:08
  xDSL Standard:                                 ITU-T G.992.5
  xDSL Annex:                                    Annex M US 56
  Channel Mode:                                  Interleaved

  Number of reset:                               3

  Chipset Vendor info (G.994.1):                 Local          Remote
    Country code:                                B500           B500
    ID:                                          BDCM           IFTN
    Specific:                                    0000           71BE

  System Vendor info (showtime):                 Local          Remote
    Country code:                                0F00           0000
    ID:                                          TMMB           ----
    Specific:                                    3C61           0000

  Bearers generic info                           DS             US
    Payload rate [Kbps]:                         11961          1539
    Attenuation [dB]:                            40.0           22.8
    Margins [dB]:                                6.1            5.8
    Output power [dBm]:                          0.0            12.3

    Number of bearers:                           1
    Bearer 0                                     DS             US
      INP [DMT symbols]:                         1.11           1.07
      Delay [ms]:                                7.98           7.94
      Depth []:                                  64             0.00
      R:                                         14             0

G.997.1 Statistics (Current):

  Failures:
    Line failures                                Near end
      Loss of signal (LOS):                      22
      Loss of frame (LOF):                       26
      Loss of power (LPR):                       0

  Performance monitoring:
    Line PM:                                     Near end
      Error second (ES):                         2107

    Channel PM:                                  Near end       Far end
      Bearer 0:
        Code Violation (CV):                     7476           4
        FEC:                                     1255004        361

    ATM data path PM:                            Near end       Far end
      Bearer 0:
        HEC violation count (HEC):               669699         N/A

G.997.1 Statistics (last 15 minutes):

  Failures:
    Line failures                                Near end
      Loss of signal (LOS):                      0
      Loss of frame (LOF):                       0
      Loss of power (LPR):                       0

  Performance monitoring:
    Line PM:                                     Near end
      Error second (ES):                         18

    Channel PM:                                  Near end       Far end
      Bearer 0:
        Code Violation (CV):                     7476           4
        FEC:                                     1255004        361

    ATM data path PM:                            Near end       Far end
      Bearer 0:
        HEC violation count (HEC):               669699         N/A

G.997.1 Statistics (last 24 hours):

  Failures:
    Line failures                                Near end
      Loss of signal (LOS):                      0
      Loss of frame (LOF):                       0
      Loss of power (LPR):                       0

  Performance monitoring:
    Line PM:                                     Near end
      Error second (ES):                         211

    Channel PM:                                  Near end       Far end
      Bearer 0:
        Code Violation (CV):                     7476           4
        FEC:                                     1255004        361

    ATM data path PM:                            Near end       Far end
      Bearer 0:
        HEC violation count (HEC):               669699         N/A
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coolsnakeman

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  • Posts: 421
    • IT Support Belfast
Re: Lots of TCP transmissions and a few Drops
« Reply #1 on: March 14, 2012, 12:02:36 PM »

Errors building on a broadband connection will cause latency which will cause your voip to be patchy. I would suggest you change the filter over making sure aswell that all sockets associated with that broadband number are also filtered and monitor the errors on that connection. If they continue to build then your going to have to start removing 1 piece of equipment of the line monitoring the errors after each device is removed. If you break it down to just a filter and the router connected into the master socket and the errors are still building i would suggest you move the router into the BT test socket. To do this you need to unscrew the 2 screws off the socket and remove the lower half of the front faceplate. In behind there to the right hand side is your BT test socket. Connected your filter into this and connect your router into the filter and monitor the errors. If they continue to build then try and get the hold of another router if at all possible and monitor with that. If it is still the same then contact your broadband service provider telling them everything you have done and request an SFI visit. If you are with BT it will be a boost engineer and you will be advised of possible charges but if you have proved the issue not to being your own equipment it wouldn't be much for you to worry about. Engineer will then come out and break the rest of the network down to try and locate where those errors are generating from. Good luck and let us know how you get on. Troubleshooting is all the same even when your having voip problems. We do have openreach engineers that are on this so they might beable to shed a bit more light to your issues.

Regards
Gary
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