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| Link
Level Retransmissions |
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| In-order
delivery |
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| n | Not
all connections benefit from retransmissions |
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| or
ordered delivery |
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| – | audio |
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| n | Need
to be able to specify requirements on a per- |
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| packet
basis |
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| – | Should
the packet be retransmitted? How many times? |
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| – | Enforce
in-order delivery? |
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| n | Need
a standard mechanism to specify the |
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| requirements |
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| – | open
issue (IETF PILC working group) |
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