Crystal/Oscillator/Resonator Oven-Controlled Crystal Oscillator (OCXO) Surface Acoustic Wave Oscillator (Active) Surface Acoustic Wave Resonator (Passive) Ceramic Resonator (Passive) Temperature-Compensated Crystal Oscillator (TCXO) Passive Crystal Oscillator Voltage-Controlled Crystal Oscillator (VCXO) Active Crystal Oscillator Other Crystals/Oscillators/Resonators Preprogrammed Oscillator