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Use Cases

Use Cases. TICTOC BOF– 70 th IETF 4 December 2007. Yaakov (J) Stein. Three Cases. The proposed charter specifies three use cases: Service Provider (SP) network well engineered on-path support walled garden security 1588 preferred General network (e.g. public Internet)

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Use Cases

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  1. UseCases TICTOC BOF– 70th IETF 4 December 2007 Yaakov (J) Stein

  2. Three Cases The proposed charter specifies three use cases: • Service Provider (SP) network • well engineered • on-path support • walled garden security • 1588 preferred • General network (e.g. public Internet) • best effort network behavior • no on-path support • security suspect • NTP preferred • Interworking case • on one side - SP network • on other side - general network We need to consider frequency and time distribution

  3. Service Provider Network Well engineered • Connection oriented (CO) or explicitly routed • Low packet loss • Low Packet Delay Variation (PDV) On-path support • Synchronous Ethernet (Sync-E) • Boundary clocks • Transparent clocks Walled garden security • core network elements under strict control • client access limited and has well-defined interfaces This is the environment where • 1588 • Sync-E combined with 1588 is preferred

  4. General Network Best effort network behavior • packet loss • PDV and outliers No on-path support • PDV degrades frequency recovery • ranging requires minimum gating Security suspect • false clock sources This is the environment where NTP is widely deployed

  5. SP network General network 1588? NTP? time source client IWF master Interworking Case Both types of network present NTP and 1588 have roughly similar semantics • establish local frequency reference • ranging with minimum gating • control loop algorithms but different syntax • message types • timestamp format (TAI/UTC, resolution) In principle, always possible to recreate time source and redistribute

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