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Operation
3.19 Bit Error Rate Tests
3.19.1
Setting up a Basic BER Test
1. Set the clock frequency and pattern generator data rate.
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Figure 26. Delay relationship
A bit error rate (BER) test is performed by driving the pattern generator
output into a DUT and back into the input of the error detector. Each bit
of the detector internal reference pattern is compared to the input bit
stream, and each mismatch is recorded as an error. The BER represents
the ratio of total number errors detected to total number of bits
received. For example, 1 error bit out of 1,000,000 total bits would
result in a BER of 1e-6 (1/1,000,000).
The N4960A serial BERT 17 and 32 Gb/s can be set up to run BER tests
using the front panel, remote SCPI commands, or N4980A multi-
instrument BERT software.
Regardless of the method used to set up a BER test, the following
describes the setup requirements.
The pattern generator data rate is based on the clock frequency
setting. Due to the half rate clock architecture of the remote
heads, the clock frequency setting is half that of the remote
heads.
Keysight N4960A Serial BERT 17 and 32 Gb/s User Guide
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