dB =10log P1 P2
dB =10log P1 P2
dB =10log P1 P2
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! Eliminates collision detection timing<br />
restrictions<br />
! Micro segmentation<br />
! Two major components in a switch<br />
! Forwarding logic<br />
! I/O ports<br />
! IEEE 802.1 defines forwarding logic<br />
! Examines incoming frame<br />
! Transfers it to the correct port<br />
! More details later<br />
117<br />
! Distributed (token) control<br />
! Commonly ring topology, but may be bus<br />
! Tokens are special bit patterns within packets<br />
! Tokens continue to circulate even if there is no<br />
traffic to transmit<br />
! Stations wishing to transmit, remove the token<br />
! All stations are responsible for identifying and<br />
accepting messages addressed to them<br />
! Additionally they must forward all other messages<br />
! Once a station has finished transmitting, it replaces<br />
the token into circulation<br />
119 120<br />
118
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