Scaling CSMNCD to lGb/s with Frame Bursting
Mart L. Molle, Mohan Kalkunte, J. Kadambi · 1997
In Gigabit Ethernet, the round-trip propagation delay can be much greater than the transmission time for a minimum length frame. In this paper, we describe some changes to the Ethernet CSMNCD medium access control algorithm that allow CSMtVCD to be used in this case. First, carrier extension is used to increase the slot time without requiring a corresponding increase to the minimum frame length. Second, frame bursting is introduced so that a host may transmit more than one frame without releasing control of the channel, in a manner that increases the eflciency for small frames without changing its oneframe-at-a-time service interface. Using simulation, we show that CSMNCD with carrier extension and frame bursting operating on I Gb/s links provides a signijkant performance increase over 100 Mb/s Fast Ethernet. These changes are being adopted by the IEEE 802.32 task force, which is currently defining the standard for Gigabit Ethernet.