Q1. What is the "Jitter" and it's significance?

Q2. What is the "Spurious mode" ?

Q3. What is the "AT-CUT" ?

Q4. What is the application of X'tal and Oscillator?

...............................................................................................................................

Q1. What is the "Jitter" and it's significance? 

A: Jitter is short-term variations of the significant instants of a digital signal from their ideal positions in time. The expected edges in a digital datastream never occur exactly where desired. Defining and measuring the timing accuracy of those edges (jitter) is critical to the performance of synchronous communication systems.   

................................................................................................................................

Q2. What is the "Spurious mode" ?     

A:One of the undesired modes of vibration of a piezoid. Usually refers to one of the inharmonic overtone modes. (Spur-Contraction of spurious mode) 

...............................................................................................................................

Q3. What is the "AT-CUT" ?    

A: A plate cut from a crystal of quartz in such a way that the plate contains the X-axis and makes an angle of about 35 1/4° which the optic axis on the r side.      

...............................................................................................................................

Q4. What is the application of X'tal and oscillator?        

A: 

Crystal

Digital camera, wireless, computers, interface cards, telephones, pagers, remote controllers, GPS, A/V products.

Oscillator

Wireless, computers, GPS, A/V products, etc.

VCXO

Modems, ADSL, wireless base stations, switching equipment, etc.

TCXO/VCTCXO

Cell phones, wireless base stations, precision apparatus, GPS, etc.

Saw Filter

Wireless transceiver, cell phones, etc.