Agilent Technologies J-BERT N4903, User Manual

Page: 332 / 434

You can specify your own setup or choose one of the predefined settings.
You can choose one of four predefined settings:
•
CUSTom: The individual parameter values apply.
•
CEI6G: Meant for CEI 6 Gbit/s tests: PRBS data rate is 1.1 Gbit/s, the
PRBS polynomial is 2
9
-1, the low-pass filter is 100 MHz.
• CEI11G: Meant for CEI 11 Gbit/s tests: PRBS data rate is 2 Gbit/s,
the PRBS polynomial is 2
11
-1, the low-pass filter is 200 MHz.
•
Gaussian: Preset values for Gaussian distribution: PRBS data rate is
2 Gbit/s, the PRBS polynomial is 2
31
-1, the low-pass filter is 100 MHz.
Enter an appropriate Data Rate . Refer to the technical specifications.
The maximum peak-to-peak Amplitude is limited by the free capacity of
the 200
+
ps delay line.
The PRBS polynomial can be chosen from a list. Available are eight
polynomials, from 2
7
-1 up to 2
31
-1.
The bounded uncorrelated jitter source is equipped with four low-pass
filters with cut-off frequencies at 20, 50, 100, and 200 MHz. One of these
filters is always active.
Periodic Jitter Parameters
Periodic jitter (PJ) is characterized by
• Amplitude
• Frequency
7
Jitter Tolerance Tests
332 Agilent J-BERT N4903 High-Performance Serial BERT
Setting
Data rate
Amplitude
PRBS
Filter