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N4970A Operation Overview
2.2 N4970A System Overview
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The N4970A provides a Pseudo Random Bit Stream (PRBS) referenced to
either the factory-set internal clock frequency or an external clock (0.05 GHz
to 12.5 GHz). The N4970A generates a bit stream equal to the clock
frequency, eg: 9.95328 GHz = 9.95328 Gb/s (SONET 10G).
The PRBS pattern length and mark density features can be selected by the
user. The pattern length and mark density settings are indicated on the front
panel of the N4970A.
When the N4970A is used in conjunction with a digital communications
analyzer, accurate high resolution measurements of electrical and optical
components or systems can be performed.
For R&D applications the N4970A source provides the engineer with a fast
rise/fall time, low jitter data stream which is useful in the development of
datacom/telecom products. Accurate repeatable eye pattern measurements
provide a valuable development tool for evaluating and comparing the
performance of design, or components.
The small size of the N4970A (3.5 x 3.5 x 1.0 inch) allows close placement to
DUT eliminating losses and distortion from long cables. The N4970A factory-
set internal clock can be used to eliminate the need for additional test
equipment clock signal generator or oscilloscope trigger divider.
In the manufacturing environment, the N4970A source provides a cost
effective solution for evaluating and tuning communication systems such as
SONET/SDH, 10 Gb/s Ethernet, fiber channel, XAUI, etc.
PRBS Generator 10 Gb/s User Guide
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