For QoS-active link-layer media the packet scheduler is responsible for negotiation with the link layer to obtain the QoS requested by RSVP.
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Mapping to the link layer QoS may be accomplished in a number of possible ways; the details will be medium-dependent. On a QoS-passive medium such as a leased line, the scheduler itself allocates packet transmission capacity. The scheduler may also allocate other system resources such as CPU time or buffers.
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