Jitter

1. Jitter generation:

A certain amount of jitter will appear at the output port of any network element (NE), even with an entirely jitter-free digital or clock signal applied to the input, effect known as jitter generation. The NE itself produces this intrinsic jitter, for example due to thermal noise and drift in clock oscillators and clock data recovery circuits. Output jitter is the total jitter measured at the output of a system, specified in unit intervals (UI). One UI corresponds to an amplitude of one clock period, independent of bit rate and signal coding, displays results as a peak-to-peak value or root mean square (RMS) value over a defined frequency range. Peak-to-peak results provide a better measure of the effect on performance, as the extremes can cause errors, whereas RMS values provide information about the average total amount of jitter.

2. Jitter tolerance (maximum tolerable jitter, MTJ):

A measurement that checks the resilience of equipment after the input of jitter, which is required to confirm that the NEs in the transmission system can operate error-free in the presence of worst-case jitter from preceding sections. Jitter tolerance is one of the most important characteristics of the clock recovery and input circuitry of network equipment.

3. Jitter transfer (jitter transfer function, JTF):

A measure of the amount of jitter transferred from the input to the output of the network equipment. JTF is important for cascaded clock recovery circuits in long-distance transmission systems with regenerators and line terminals. In addition, the jitter transfer measurement is required to confirm that cascaded NEs in the transmission system have not amplified the jitter.

Related Knowledge:

• BER and BERT
• What is Clock and Date Recovery?
• What is DDM/DOM?
• Half-Duplex Communication

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