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MCSE Notes for Ethernet 100.
Quick Reference Guide to Auto-Negotiation
13.4 Auto-Negotiation Priorities
When two Auto-Negotiation devices with multiple capabilities are connected together, they find their highest performance mode of operation based on a priority table. The Auto-Negotiation protocol contains a set of priorities which result in the devices selecting their highest common set of abilities.
The priorities are listed in the table below in a ranking from the highest to
the lowest. The full duplex mode of operation is given higher priority than
the original (half duplex) Ethernet, since the full duplex system can send
more data than a half duplex link operating at the same speed. Therefore if
the devices at both ends of the link can support full duplex operation, and
if they also both support Auto-Negotiation of this capability, then they
will automatically configure themselves for the higher performance full
duplex mode. 
The table shows that if both devices on the link can support, for example, 10BASE-T and 100BASE-TX, then the Auto-Negotiation protocol at both ends will connect using the 100BASE-TX mode instead of 10BASE-T.
Quick Reference Guide to Auto-Negotiation - 25 MAY 96 [Next] [Previous] [Top] [Copyright] [Books About Ethernet]
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