User guide

BER Location
BER Location - Concepts
The Serial BERT can be run in BER location mode. In this mode, the errors are not
counted on all bits of the data signal, but on a particular bit or block of bits in the
pattern. You can specify which bit position(s) are considered during the
measurement.
This allows, for example, to calculate the BER for the header bits or the payload of
a data stream exclusively.
BER Location - Procedures
To set up the BER location mode, do the following:
1
Click the BER Location menu item from the ED Setup submenu.
2
Select whether you want to locate errors on All Bits, on a particular Block of
bits, or on a Single Bit in the pattern.
N O T E
The Single Bit option is disabled in "8B/10B Comparison", "Bit Comparison without
PCIe3 SKPOS" and "Bit Comparison without USB3.1 SKPOS" error ratio modes.
If you select Block or Single Bit, enter the bit positions in the respective fields.
3
Click OK to finish the BER location mode setup.
BER Location - Reference
The Bit Error Location Mode dialog box offers the following options:
N O T E
The Single Bit option is disabled in "8B/10B Comparison", "Bit Comparison without
PCIe3 SKPOS" and "Bit Comparison without USB3.1 SKPOS" error ratio modes.
Setting up the Error Detector 5
Agilent J-BERT N4903B High-Performance Serial BERT 223