User guide

• If the Half Rate Clock check box is selected, the multiplier of the clock multiplier
will be set automatically to 2 and the frequency sent to the clock multiplier is
Data Rate/2.
• If the Half Rate Clock check box is not selected, the multiplier of the clock
multiplier will be set automatically to 1 and Data Rate itself is sent to the box.
You can use the Termination check box to toggle between true differential DC
coupling and center tapped termination. In center tapped mode, you can specify
the termination voltage. The Termination fields are used to set the termination
voltage.
Multiplexer (N4876A) Window
The N4876A multiplexer doubles the pattern generator data rate by multiplexing
two pattern generator channels. It extends the variable generator data rate of J-
BERT N4903B up to 28.4 Gb/s.
The Multiplexer (N4876A) window contains the following elements:
The f/2 jitter defines how much 'mismatch' the period of odd/even bits at the
output of the MUX have.
If f/2 jitter is at 0, then the observed output period at the multiplexer is half the
input period.
Setting up External Instrument(s) 2
Agilent J-BERT N4903B High-Performance Serial BERT 55
Termination
f / 2 Jitter