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Conference 7.286::fddi

Title:FDDI - The Next Generation
Moderator:NETCAD::STEFANI
Created:Thu Apr 27 1989
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2259
Total number of notes:8590

2030.0. "FDDI DEFEA-DA Connecting 2 Alphas NT" by KERNEL::WILTSHIREA (Good frames, Bad frames...) Fri May 03 1996 06:13

     Hi All,
          If you connect 2 Alpha 2100 with DEFEA-DA (dual channel) FDDI
        cards, should both lights be green ?
    
        ie Does NT support 'full duplex' ? or does it only
        use one channel and have the second channel as a backup ?
    
        Thanks Andy
    
    ps:cross posted to windows-nt notes
T.RTitleUserPersonal
Name		DateLines
2030.1STRWRS::KOCH_PIt never hurts to ask...Fri May 03 1996 08:2910
    
    You're confusing apples with oranges.
    
    Full duplex has nothing to do with multiple controllers.
    
    I've been told NT supports multiple controllers, but it depends on what
    protocol you are using over the cards. What protocols are you using?
    
    You'll have to find out from the windows-nt notesfile whether NT
    supports full duplex.
2030.2NETCAD::STEFANIFri May 03 1996 11:3126
    >>      If you connect 2 Alpha 2100 with DEFEA-DA (dual channel) FDDI
    >>    cards, should both lights be green ?
    
    If you connect the two DEFEA-DA adapters point-to-point using *two*
    fiber crossover cables, you need to connect the A port of one adapter
    to the B port of the other and vice-versa.  If you do this properly,
    all four LED's (two on each NIC) should be solid green.
    
    >>    ie Does NT support 'full duplex' ? or does it only
    >>    use one channel and have the second channel as a backup ?
    
    It's not Windows NT that supports full-duplex, but rather, it is a
    function of the NIC.  In the case of the DEFEA products, yes, we
    support FDDI full-duplex under Windows NT.  When you install the
    driver, or use the Configure option to display the dialog box you'll
    see an option for enabling full-duplex.  Once you set this and reboot
    the system, the adapter will try to go into full-duplex and will
    succeed if it's connected point-to-point with another similarly enabled
    FDDI NIC, or the Digital GIGAswitch/FDDI.
    
    FDDI full-duplex works on both SAS and DAS adapters, the "trick" is to
    make sure that you have two MACs and that both end nodes support
    full-duplex.  It's not correct to say that one channel is used and
    another is backup.
    
    - Larry