Agilent Technologies N4962A Guida Utente Pagina 38

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Operation
38
Serial BERT 12.5 Gb/s User Guide
Data Path
-
>
PRBS
¯¯¯¯
Invert
button
& light
Light indicates inverted PRBS generator
output:
OFF when PRBS bit stream is not
inverted;
ON when PRBS bit stream is
inverted.
Button
toggles the output inversion ON
and OFF.
Inverting the bit stream after training and
turning on the detector will result in a
BER measurement approaching 1E0.
OFF
Data Path
-
>
Disabled
Enabled
Thru
(none)
button
& 3
lights
Light indicates which data path
is
selected:
Disabled: IN/IN¯¯ connected to
error detector, PRBS generator is
disabled;
Enabled: IN/IN¯¯ connected to
error detector, PRBS generator is
enabled;
Thru: IN/IN¯¯ connected to
DataThru/DataThru¯¯¯¯¯¯ with some
path loss, PRBS generator is
enabled;
Button cycles between the data path
options.
Disabled
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