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There is a
working prototype: the CCSDS
File
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Delivery
Protocol (CFDP).
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Architecturally
very similar to IPN.
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International
standard, four experimental implementations.
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Baselined for
Deep Impact mission, potentially others.
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But CFDP was
designed to support individual space
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flight missions,
not to serve as the infrastructure for a
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permanent,
general-purpose network.
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Addressing scheme
is simple but limited.
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Application,
transport, network, and reliable link layers are
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combined into a
single protocol, which only does file transfer.
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Specification of
proposed IPN protocols is under way.
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