Cs with on-board oscillators requiring low frequency fundamental crystals are commonplace but now IC frequency multipliers require the higher frequencies of third overtone crystals.
Pure Spectrum is a trademark used by Connor-Winfield to define that the “Pure Spectrum” line of oscillators and the modules containing these oscillators, use only fundamental or 3rd overtone quartz crystal technology.
Aging is the change in crystal frequency over time. This frequency change over the life of the part has to be accounted for in the application.
The use of different crystal cuts in frequency control applications result in different performance.
Choosing the right GPS timing solution is essential for 4G base station reliability and performance.