Agilent Technologies J-BERT N4903, User Manual

Page: 317 / 434

For more information see
•
“Intersymbol Interference” on page 320
Level Noise
Level noise affects the voltage amplitude of the eye opening.
The Serial BERT provides the Interference Channel option J20 to
simulate level variations by adding sinusoidal interference.
For more information see
•
“Crosstalk” on page 321
PLL Performance Test
Testing a PLL (or CDR) is not complete until the entire frequency range
of the PLL has been checked under worst-case conditions.
For this purpose, the Serial BERT provides the Jitter Tolerance
Characterization measurement.
For more information see
•
“Jitter Tolerance Characterization - Concepts” on page 338
PLL Standards and Compliance Tests
The Optical Internetworking Forum (OIF) as well as other institutions
have proposed standards for testing the performance of data receivers
and receiver circuits in the presence of jitter.
For this purpose, the Serial BERT provides the Jitter Tolerance
Compliance measurement. This measurement is available as an option
(option J12) which can be ordered together with the instrument or
retrofitted.
For more information see
•
“Jitter Tolerance Compliance - Concepts” on page 352
Understanding the Types of Jitter
The standards for jitter tolerance tests prescribe combinations of
certain jitter types. This section gives an overview of these types.
Jitter Tolerance Tests
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Agilent J-BERT N4903 High-Performance Serial BERT 317