User guide

The frequency range of sinusoidal interference is limited (see the technical
specifications).
One of four modes can be chosen for sinusoidal interference:
• Common: Requires that a differential data signal is generated and connected
to P1/P1 or P2/P2 of the Interference Channel.
In common mode, both components of the differential data signal are
amplitude-modulated with the same sinewave. This adds common mode noise.
• Differential: Requires that a differential data signal is generated and connected
to P1/P1 or P2/P2 of the Interference Channel.
In differential mode, both components of the differential data signal are
amplitude-modulated, one with the normal sinewave, the other with the
inverted sinewave. This adds differential noise.
• Single-ended normal: Modulates the data signal that is connected to P1 or P2
of the Interference Channel.
• Single-ended complement: Modulates the data signal that is connected to
P1 or P2 of the Interference Channel.
Jitter Tolerance Characterization
Jitter Tolerance Characterization - Concepts
During a jitter tolerance characterization test, jitter is applied sequentially at a
number of frequency points in the frequency range of interest.
The receiver checks for the onset of transmission errors and increments/
decrements the jitter amplitude using a control algorithm, re-testing for errors at
one frequency point until the target BER threshold is found. This is repeated for
each subsequent jitter frequency step to provide a plot of the DUT tolerance.
Jitter Tolerance Tests 8
Agilent J-BERT N4903B High-Performance Serial BERT 433
Frequency
Mode