Thomas Kunz
Systems and Computer Engineering
377
Link Layer Mechanisms
Link Level Retransmissions
Link Level Retransmissions
nLink level
retransmission schemes retransmit a packet at the link layer, if errors are
detected
nRetransmission
overhead incurred only if errors occur
–unlike FEC overhead
In general
nUse FEC to
correct a small number of errors
nUse link level
retransmission when FEC capability is exceeded