How to know duplex mode?

Discussion in 'Windows XP Networking' started by njem, Nov 1, 2010.

  1. njem

    njem Guest

    How can I know if a given wired connection is in full or half duplex?
    I know how to check the settings but most adapters are set to auto-
    negotiate and I don't know what was negotiated. Some switches will
    tell you on their status lights but there's got to be a way to query a
    system and get it to say if it's running in full or half. I"ve
    searched everywhere and just find tons of answers about how to change
    settings on a card. That doesn't give me a way to check the current
    state. Thanks.
     
    njem, Nov 1, 2010
    #1
    1. Advertisements

  2. njem <> wrote in
    news:
    m:

    > How can I know if a given wired connection is in full or half
    > duplex? I know how to check the settings but most adapters are set
    > to auto- negotiate and I don't know what was negotiated. Some
    > switches will tell you on their status lights but there's got to
    > be a way to query a system and get it to say if it's running in
    > full or half. I"ve searched everywhere and just find tons of
    > answers about how to change settings on a card. That doesn't give
    > me a way to check the current state. Thanks.
    >


    That detail is buried in the driver details. AFAIK, there is no
    standard Windows driver interface that extracts this information from
    whatever manufacturer's network card/driver that you use. Having said
    that, I believe that *some* manufacturer's drivers generate a System
    Log message declaring this information that you can look up using the
    Event Viewer (Start -> Run -> "eventvwr.msc"). For example, my
    computer has an Intel network card/chipset and I see the following
    Information message in my System Event log at startup:

    Intel(R) 82567LM Gigabit Network Connection Link has been established:
    100Mbps full duplex.

    HTH,
    John
     
    John Wunderlich, Nov 1, 2010
    #2
    1. Advertisements

  3. njem

    njem Guest

    >  For example, my
    > computer has an Intel network card/chipset and I see the following
    > Information message in my System Event log at startup:
    >
    > Intel(R) 82567LM Gigabit Network Connection Link has been established:
    > 100Mbps full duplex.


    Excellent idea. I just checked a few systems and most had some similar
    report. One with an Intel NIC gives a generic report about connecting
    but no details.

    Thanks.
     
    njem, Nov 2, 2010
    #3
    1. Advertisements

Want to reply to this thread or ask your own question?

It takes just 2 minutes to sign up (and it's free!). Just click the sign up button to choose a username and then you can ask your own questions on the forum.
Similar Threads
  1. Cliff
    Replies:
    0
    Views:
    273
    Cliff
    Jul 30, 2003
  2. Darren Robertson

    Full Duplex or not Full Duplex that is the question?

    Darren Robertson, Nov 10, 2003, in forum: Windows XP Networking
    Replies:
    2
    Views:
    1,037
    Hans-Georg Michna
    Nov 11, 2003
  3. PawsForThought

    Full Duplex vs Half Duplex

    PawsForThought, Aug 16, 2005, in forum: Windows XP Networking
    Replies:
    5
    Views:
    2,016
    PawsForThought
    Aug 17, 2005
  4. Conan Kelly

    Checking Duplex mode?

    Conan Kelly, Aug 25, 2006, in forum: Windows XP Networking
    Replies:
    3
    Views:
    3,309
    Chuck
    Aug 28, 2006
  5. lywwing

    How to know network port running half or full duplex

    lywwing, Nov 30, 2007, in forum: Windows XP Networking
    Replies:
    0
    Views:
    300
    lywwing
    Nov 30, 2007
Loading...

Share This Page