Half-Duplex Gigabit Ethernet
Backward compatibility broke down when the 802.3 committee wrote the rules for gigabit hubs operating in a CSMA/CD environment. Some Ethernet protocol elements had to be changed to accommodate half-duplex Gigabit Ethernet.
Half-duplex Gigabit Ethernet is not used at the time of writing, but a description of the protocol elements is included for completeness. The discussion will uncover another reason that motivated vendors to implement only full-duplex Gigabit Ethernet—namely, the small diameter of a gigabit collision domain.
Modification to Frame Format for Half-Duplex Mode
Chapter 4, "The Classical Ethernet CSMA/CD MAC Protocol," presented one of the changes that was needed to implement CSMA/CD (half-duplex ...
Get Local Area High Speed Networks now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
