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HP ProCurve Hub - Full/Half Duplex

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  • 1.  HP ProCurve Hub - Full/Half Duplex

    Posted Jul 06, 2001 10:43 AM
    We recently purchased a HP ProCurve Hub (J3294A). I am wondering why it does not support full duplex (especially for such a late model device). Could you explain the performance differences between Full and Half? Older (non-AutoSensing) NIC's need manual config when attached to this hub (they default to Full Duplex). Thanks - Steve


  • 2.  RE: HP ProCurve Hub - Full/Half Duplex

    Posted Jul 07, 2001 01:46 PM
    A hub just rebroadcasts all packets arriving at it. I would
    be surprised to see a hub supporting full duplex. The broadcast approach used by hubs does not allow full
    duplex communications.

    If you want full duplex you shoud get a switch. A switch
    will store and forward packets to the appropriate
    cards. It can read in incoming packet from a full duplex
    connection while sending a previously received packet
    to the same card.

    I have never encountered a card the defaults to full
    duplex. Many older cards only support half duplex
    as it is the original ethernet model. If you have to
    reset the cards, then they have been configured
    to full duplex mode at some time in the past.

    I use autodetect and only force duplex when I notice
    errors on the connection.


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