User guide

N4970A Operation Overview
PRBS Generator 10 Gb/s User Guide 11
2 N4970A Operation Overview
The N4970A is a Pseudo Random Bit Stream (PRBS) generator with an
internal clock that can be factory set from a selection of frequencies around
10 GHz, and can also be user-
configured to use a 0.05 to 12.5 GHz clock signal
from an external source.
The N4970A features low jitter, fast rise and fall times, and a clean eye
pattern. The source provides five selectable pattern lengths and three
selectable mark densities. The N4970A comes in an easy to use compact
(3.5 x 3.5 x 1.0 inch) package.
The PRBS generator provides the "clean eye" needed to evaluate the
performance of optical system components or complete systems, e.g.
SONET/SDH, 10 Gb/s ethernet, XAUI, etc.
2.1 Features
•
Single-frequency clock source
• Wide operating range, up to 12.5 Gb/s (external clock)
• RMS jitter ~ 1.0 ps
• Fast rise/fall times
• Small size: 3.5" x 3.5" x 1"
• Multiple output patterns: 2
7
-1, 2
10
-1, 2
15
-1, 2
23
-1, 2
31
-1
• Multiple mark ratios: 1/2, 1/4, 1/8
• Differential outputs