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  2. Synchronous Ethernet - Wikipedia

    en.wikipedia.org/wiki/Synchronous_Ethernet

    The SSM encoded within the TLV is a four-bit field whose meaning is described in ITU-T G.781. Synchronization architectures [ edit ] A general requirement for SyncE was that any network element (NE) should have at least two reference clocks, and in addition, Ethernet interfaces must be able to generate their own synchronization signal in case ...

  3. Source-specific multicast - Wikipedia

    en.wikipedia.org/wiki/Source-specific_multicast

    Source-specific multicast. Source-specific multicast ( SSM) is a method of delivering multicast packets in which the only packets that are delivered to a receiver are those originating from a specific source address requested by the receiver. By so limiting the source, SSM reduces demands on the network and improves security.

  4. Clock synchronization - Wikipedia

    en.wikipedia.org/wiki/Clock_synchronization

    Clock synchronization. Clock synchronization is a topic in computer science and engineering that aims to coordinate otherwise independent clocks. Even when initially set accurately, real clocks will differ after some amount of time due to clock drift, caused by clocks counting time at slightly different rates.

  5. Saint Louis University Hospital - Wikipedia

    en.wikipedia.org/wiki/Saint_Louis_University...

    Saint Louis University Hospital (SLU Hospital) is a 356-bed [1] non-profit, research and academic medical center located in St. Louis, Missouri, United States, providing tertiary care for the east Missouri region. The medical center is a part of the SSM Health System and is affiliated with the Saint Louis University School of Medicine. [2]

  6. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Doomsday Clock - Wikipedia

    en.wikipedia.org/wiki/Doomsday_Clock

    Doomsday Clock. The Doomsday Clock is a symbol that represents the likelihood of a human-made global catastrophe, in the opinion of the members of the Bulletin of the Atomic Scientists. [1] Maintained since 1947, the clock is a metaphor, not a prediction, for threats to humanity from unchecked scientific and technological advances.

  8. Clock network - Wikipedia

    en.wikipedia.org/wiki/Clock_network

    The "program clock" is a timer that can be programmed with punched paper tape to ring bells or turn machines on and off at preprogrammed times. A clock network or clock system is a set of synchronized clocks designed to always show exactly the same time by communicating with each other. Clock networks usually consist of a central master clock ...

  9. Deep Space Atomic Clock - Wikipedia

    en.wikipedia.org/wiki/Deep_Space_Atomic_Clock

    The Deep Space Atomic Clock ( DSAC) was a miniaturized, ultra-precise mercury-ion atomic clock for precise radio navigation in deep space. DSAC was designed to be orders of magnitude more stable than existing navigation clocks, with a drift of no more than 1 nanosecond in 10 days. [3] It is expected that a DSAC would incur no more than 1 ...

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