... | @@ -386,21 +386,31 @@ reconfiguration seem to be inline in WR and AVB. (**ToFinish**) |
... | @@ -386,21 +386,31 @@ reconfiguration seem to be inline in WR and AVB. (**ToFinish**) |
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### Critical-data-wise
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### Critical-data-wise
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In short, WR is a corner case of AVBg2 where all the end stations in a
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logic network (VLAN) register to the same stream, thus a stream in WR is
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defined by VLAN. WR adds sophisticated Forward Error Correction (FEC),
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at a cost of latency deterioration, to spare network components
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(switches) and still provide fault-tolerance of critical data stream to
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component failure. This is because WR it is foreseen for large scale
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networks.
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WR does not foresee dynamic stream reservation -- it is assumed that
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WR does not foresee dynamic stream reservation -- it is assumed that
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there are two kinds of data: (1) critical (so called Control Messages,
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there are two kinds of data: (1) critical (so called Control Messages,
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CMs) and (2) non-critical (Best-effort, BE). All critical data is
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CMs) and (2) non-critical (Best-effort, BE). It is again, a corner case
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treated equally and share the same resources which are allocated to it
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of AVBg2 where there would be Class A stream (critical data) and
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(a very limited number of CM streams is foreseen). The distribution
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best-efford data. All critical data is treated equally and share the
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characteristics of the CMs in WR is also different then streams in AVB.
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same resources which are allocated to it (a very limited number of CM
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In WR, the critical data stream is supposed to be broadcast within VLAN,
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streams is foreseen). The distribution characteristics of the CMs in WR
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thus a stream is propagated to all the end stations within a VLAN: a
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is different then usual streams in AVB. In WR, the critical data stream
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particular case of such solution is to define VLAN for a stream between
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is supposed to be broadcast within VLAN, thus a stream is propagated to
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two end stations. Still, separate VLAN-streams do not have separate
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all the end stations within a VLAN: a particular case of such solution
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resources. On the other hand, WR critical data one-to-many stream seems
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is to define VLAN for a stream between two end stations. Still, separate
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to be a corner case of AVB stream.
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VLAN-streams do not have separate resources. On the other hand, WR
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critical data one-to-many stream seems to be a corner case of AVB
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stream.
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In WR, the critical data is encoded using Forward Error Correction to
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In WR, the critical data is encoded using Forward Error Correction to
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prevent loss of data critical due to data corruption (bit error
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prevent loss of critical data due to data corruption (bit error
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rate/switch malfunction) and to allow dynamic network redundancy while
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rate/switch malfunction) and to allow dynamic network redundancy while
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providing undisturbed critical data stream. In AVBg2 simplicity
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providing undisturbed critical data stream. In AVBg2 simplicity
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prevails:
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prevails:
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