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| Link Layer
Mechanisms |
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| Link
Level Retransmissions |
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| n | Link
level retransmission schemes retransmit a |
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| packet
at the link layer, if errors are detected |
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| n | Retransmission
overhead incurred only if errors |
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| occur |
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| – | unlike
FEC overhead |
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| In
general |
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| n | Use
FEC to correct a small number of errors |
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| n | Use
link level retransmission when FEC capability |
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| is
exceeded |
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