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cellular modem+irda+ppp: Linux vs. WinXP - Linux Setup, Configuration & Administration

Hi, I'm not sure if this is the proper group to ask this question, but I have a problem with the data transfer rate of the softmodem of my Nokia 6210 cellular. 1) Both, under Linux (SuSE 8.1 on a ThinkPad A31) and WinXP I have the softmodem configured as a standard AT modem. Under Linux I've done this via Yast2->Network/Basic-> Modem configuration. The serial port in both cases is the IR port (dev/ircomm0 under Linux) set to a baud rate of 115200. No special init strings other than 'ATZ' are sent to the modem. No HSCSD, GPRS or other ...

  1. #1

    Default cellular modem+irda+ppp: Linux vs. WinXP

    Hi,

    I'm not sure if this is the proper group to ask this
    question, but I have a problem with the data transfer
    rate of the softmodem of my Nokia 6210 cellular.

    1) Both, under Linux (SuSE 8.1 on a ThinkPad A31) and
    WinXP I have the softmodem configured as a standard AT
    modem. Under Linux I've done this via Yast2->Network/Basic->
    Modem configuration. The serial port in both cases is
    the IR port (dev/ircomm0 under Linux) set to a baud rate
    of 115200. No special init strings other than 'ATZ' are
    sent to the modem. No HSCSD, GPRS or other 'high speed'
    connections are sought for, i.e. a plain 9600 baud
    connection to the ISP is expected.

    2) Both, under Linux and WinXP connecting to the ISP
    works well. However, downloading several test-files
    shows, that the data transfer rate in the Linux case
    is >>> a factor of 6-8 *slower* <<< than under WinXP ?!?

    What is going wrong here ?
    Anyone had this experience before ?
    Is there any way to fix this / any diagnostic strategy
    to find the bottleneck / any special ppp option to
    speed up things ...? Any help would be most appreciated.

    Wolfram

    PS: In the 'Datarate Monitor' of the 'KInternet' Tool I
    have realized, that the B/s-rx graph on transfer through
    the cellular modem consists of equidistant very short,
    sharp spikes with rather long 'empty' periods. This looks
    very different from that graph for other modems. (maybe
    this is a clue?)

    Wolfram Brenig Guest

  2. #2

    Default Re: cellular modem+irda+ppp: Linux vs. WinXP

    hi everyone,
    i need help configuring my motorola mobile phone on linux ,(it's a
    gprs phone that i use to get connected to the net) in win xp it comes
    with a setup file, but in linux i can't figure how to install it, i
    use a serial port to connect it to the pc.
    thank you
    http://ginomd.sdf-eu.org Guest

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