Matches in DBpedia 2015-10 for { ?s ?p "“Synchronization is as important as power at the cell site.”The quote above suggests that we can think of holdover in synchronization applications as analogous to running on backup power.Modern wireless communication systems require at least knowledge of frequency and often knowledge of phase as well in order to work correctly. Base stations need to know what time it is, and they usually get this knowledge from the outside world somehow (from a GPS Time and Frequency receiver, or from a synchronization source somewhere in the network they are connected to). But if the connection to the reference is lost then the base station will be on its own to establish what time it is. The base station needs a way to establish accurate frequency and phase (to know what time it is) using internal (or local) resources, and that’s where the function of holdover becomes important.Two independent clocks, once synchronized, will walk away from one another without limit. To have them display the same time it would be necessary to re-synchronize them at regular intervals. The periods between synchronizations is referred to as Holdover and performance under Holdover relies on the quality of the reference oscillator (usually an OCXO), the PLL design and the correction mechanisms employed."@en }
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- Holdover_in_synchronization_applications abstract "“Synchronization is as important as power at the cell site.”The quote above suggests that we can think of holdover in synchronization applications as analogous to running on backup power.Modern wireless communication systems require at least knowledge of frequency and often knowledge of phase as well in order to work correctly. Base stations need to know what time it is, and they usually get this knowledge from the outside world somehow (from a GPS Time and Frequency receiver, or from a synchronization source somewhere in the network they are connected to). But if the connection to the reference is lost then the base station will be on its own to establish what time it is. The base station needs a way to establish accurate frequency and phase (to know what time it is) using internal (or local) resources, and that’s where the function of holdover becomes important.Two independent clocks, once synchronized, will walk away from one another without limit. To have them display the same time it would be necessary to re-synchronize them at regular intervals. The periods between synchronizations is referred to as Holdover and performance under Holdover relies on the quality of the reference oscillator (usually an OCXO), the PLL design and the correction mechanisms employed.".