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Tspec and Rspec (Traffic and Reservation Specs)
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Tspec has two incarnations: Receiver_Tspec in Resv messages and Sender_Tspec in Path messages
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Tspec is is a description of the traffic pattern for which service is being requested
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Tspec is one side of a "contract" between the data flow and the service.
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Service module agrees to provide a specific QoS if and only if the flow's data traffic remains conformant to the Tspec
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Example: upper bound on the peak rate
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