81250 Datasheet, PDF (44/64 Pages) Keysight Technologies – Agilent ParBERT 81250 Parallel Bit Error Ratio Tester

Agilent E4832A ParBERT 675 Mb/s Data Module
Agilent E4838A ParBERT 675 Mb/s Generator Front-End
Agilent E4835A ParBERT 675 Mb/s Analyzer Front-End
Technical Specifications
E4832A 675 Mb/s
generator/analyzer module
This module holds any combina-
tion of up to two analyzer front-
end pairs (E4835A) and four gen-
erator front-ends (E4838A).
Clock module/data mode
The generator can operate in
clock mode or data mode. Clock
mode is achieved when the gen-
erator is assigned as a pulse port.
Data mode is achieved with
assigning it to a data port. In
clock mode it is a fixed duty
cycle of 50%. In data mode it is
NRZ format with variable delay.
The analyzer only works as a
data port whenever used with
variable sampling delay. The
sampling delay consists of two
elements: the start delay and the
fine delay. The fine delay can be
varied within ±1 period without
stopping.
The segment length resolution is
the resolution to which the
length of a pattern segment can
be set. The maximum memory
per channel of the E4832A can
be set in steps of 16 bits up to a
length of 2048 Kbit. If the 16-bit
segment length resolution is too
coarse, memory depth and
frequency can be traded.
Sub-frequencies
For applications requiring differ-
ent frequencies at a fraction of
the system clock, the ratio can be
divided or multiplied by 2, 4, 8,
or 16. This influences the
dependency between segment
length resolution and maximum
memory depth.
E4832A generator/
analyzer 675 Mbit/s
module
4 slots for the
front-ends
E4835A(1), E4838A
(1) Pairs occupy two
front-end slots of the
E4832A
Figure 27. E4832A module
Data capabilities
PRBS/PRWS and memory-based
data are defined by segments.
Segments are assigned to a gen-
erator, and for stimulating a pat-
tern. On an analyzer, it defines
the expected pattern which the
incoming data are compared to.
The expected pattern can contain
mask bits.
Fig 28. Wave diagram of E4832A generator
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ParBERT 81250 Main Overview