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The
preemption issue is directly linked with the data rates that RPR will support,
but not exclusively. It is also linked with the services that RPR will provide
at lower rates. My opinion is that delay and jitter bounded committed services
will be implemented over high rate RPR rings (1G and up). Some users may choose
to apply RPR for lower rates to provide these services, but those will be
limited to LAN applications that are more tolerant.
Since
for high rates, even with jumbo frames, preemption does not provide a
substantial (compared with the implementation complication) jitter and delay
gain, we should avoid it.
Note
that this does not preclude using RPR at lower rates for applications that do
not require committed delay and jitter guarantees.
Leon
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