Network connection stuck at 100Mbps (Gigabit card installed)...


  1. Posts : 1
    Windows 7 64Bit Pro
       #1

    Network connection stuck at 100Mbps (Gigabit card installed)...


    Hi all,

    I cannot work out what could be causing a network card to only connect at 100mbps (full duplex).

    The setup of the office is as follows:
    WAN -> Router = 100Mbps Fibre
    Router -> Switch = 1000Mbps port
    Switch -> Patch Panel = Cat5e Cable (Switch port configured to Auto)
    Patch Panel -> Floor Port = Cat5e Cable
    Floor Port -> PC = Cat5e Cable but PC will only register 100Mbps

    I have tried to set the PC to 1000Mbps Full Duplex through the NIC Properties page.
    I have tried forcing the Switch to broadcast at 1000Mbps on the relevant port.
    Either of the above just show no network connection when set to 1000Mbps.

    I have tried changing the network cables.

    I have disabled and re-enabled the NIC from the BIOS.

    I have uninstalled the NIC driver from windows (inc. deleting the files) and then allowing windows to install the driver fresh, followed by a windows update for a newer driver version.

    Despite all the above, the PC will not connect at 1000Mbps.

    The PC is a Lenovo M90z, Win 7 Pro x64, 4GB RAM.
    NIC Card: Intel 82578DM Gigabit Network Connection.

    Any ideas on what to do?
      My Computer


  2. Posts : 21
    Ultimate x64
       #2

    I see this all the time. Sorry to say but without replacing the switch its unlikely you will ever be able to solve it (and yes it is likely some device son that same switch will work at gig and others wont). Problem with the switches is some of them don't seem to broadcast their capabilities in the correct fashion, so although it may be able to do 1000FD the PC does not recognise this as a valid mode and will fall to the next fastest option.

    what you can try, is disable auto negotiation on both the NIC and the switch and select 1000FD mode. If the link wont come up in this mode you have hit the end of the road.
      My Computer


 

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