... | @@ -155,11 +155,20 @@ Improvements to AVB Gen 1: |
... | @@ -155,11 +155,20 @@ Improvements to AVB Gen 1: |
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- communication recovery (RSTP)
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- communication recovery (RSTP)
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- \[re-\]synchronization (802.1AS)
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- \[re-\]synchronization (802.1AS)
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- \[re-\]reservation of stream (802.1Qat)
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- \[re-\]reservation of stream (802.1Qat)
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- Ultra-low latency for critical traffic,
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- Ultra-low latency for critical traffic
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[page 8](http://www.ieee802.org/1/files/public/docs2011/new-avb-KimNakamura-automotive-network-requirements-0311.pdf)
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- maximum latency: 100us over 5 AVB bridge hops @ 100Mb or 1Gbps
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- maximum latency: 100 over 3 bridge hops @ 100Mb or 1Gbps
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([page 2](http://www.ieee802.org/1/files/public/docs2011/new-avb-nakamura-automotive-backbone-requirements-0907-v02.pdf))
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- requires resource
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reservation
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- guaranteed and topology independent latency
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- main network characteristics: max 32 devices (switches+nodes),
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links of 24m, max network span: 30m (details:
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[page 2](http://www.ieee802.org/1/files/public/docs2011/new-avb-nakamura-automotive-backbone-requirements-0907-v02.pdf))
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- traffic characteristics: "control data" size (payload): ~256
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bytes, max of 32 "control streams", "normal data" size
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(payload): ~1500 bytes (details:
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[page 2](http://www.ieee802.org/1/files/public/docs2011/new-avb-nakamura-automotive-backbone-requirements-0907-v02.pdf))
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### P802.1ASbt: Timing and Synchronization for Time-Sensitive Applications
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### P802.1ASbt: Timing and Synchronization for Time-Sensitive Applications
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