Specifications

5
Jitter analysis (Option 200)
The “J” in DCA-J represents the ability to perform jitter analysis.
The 86100C is a Digital Communications Analyzer with jitter
analysis capability. The 86100C adds a fourth mode of operation
– Jitter Mode. Extremely wide bandwidth, low intrinsic jitter, and
advanced analysis algorithms yield the highest accuracy in jitter
measurements.
As data rates increase in both electrical and optical applica-
tions, jitter is an ever increasing measurement challenge.
Decomposition of jitter into its constituent components is becom-
ing more critical. It provides critical insight for jitter budgeting
and performance optimization in device and system designs.
Many communications standards require jitter decomposition for
compliance. Traditionally, techniques for separation of jitter have
been complex and often difficult to configure, and availability of
instruments for separation of jitter becomes limited as data rates
increase.
The DCA-J provides simple, one button setup and execution of
jitter analysis. Jitter Mode decomposes jitter into its constituent
components and presents jitter data in various insightful displays.
Jitter Mode operates at all data rates the 86100C supports,
removing the traditional data rate limitations from complex jitter
analysis. The 86100C provides several key attributes to jitter
analysis:
• Very low intrinsic jitter (both random and deterministic)
translates to a very low jitter noise floor which provides
unmatched jitter measurement sensitivity
• Wide bandwidth measurement channels deliver very low
intrinsic data dependent jitter and allow analysis of jitter on all
data rates to 40 Gb/s and beyond
• PatternLock triggering technology provides sampling efficiency
that makes jitter measurements very fast
• Firmware revision 8.0 allows for accurate jitter measurements
on signals with large RJ/PJ components (up to 0.7 UI)
Jitter analysis functionality is available through the Option 200
software package. Option 200 includes:
• Decomposition of jitter into Total Jitter (TJ), Random Jitter
(RJ), Deterministic Jitter (DJ), Periodic Jitter (PJ), Data
Dependent Jitter (DDJ), Duty Cycle Distortion (DCD), and Jitter
induced by Intersymbol Interference (ISI)
• •Variousgraphicalandtabulardisplaysofjitterdata
• Export of jitter data to convenient delimited text format
• Save / recall of jitter database
• Jitter frequency spectrum
• Isolation and analysis of Sub-Rate Jitter (SRJ), that is, periodic
jitter that is at an integer sub-rate of the bitrate
• Bathtub curve display in both Q and logBER scale
• Adjustable total jitter probability
Advanced EYE Analysis (Option 401)
Accurate Jitter Measurements on Long Patterns
When testing jitter performance against specifications, some
standards, such as 10 Gigabit Ethernet, often make use of long
patterns such as PRBS31. Longer patterns emulate actual data
traffic more accurately and can uncover more problems within a
device. However, these long patterns can be a challenge for many
instruments that measure jitter and estimate Total Jitter (TJ).
86100CU-401 addresses this challenge by making compliant jitter
measurements on long patterns, such as PRBS31 or live traffic.
Using powerful jitter analysis algorithms, the software measures
RJ, DJ, and calculates estimated TJ, on electrical or optical
signals.
Additionally, the application measures high probability jitter such
as J2 Jitter, sometimes referred to as “99% Jitter” or “all but 1%
of jitter”. It also measures J9 Jitter, defined at a BER of 2.5E-10.
Data Dependent Pulse Width Shrinkage (DDPWS), a component
of Data Dependent Jitter (DDJ), is also reported when the 86100C
DCA-J is equipped with 86100C-200 Enhanced Jitter Analysis.
Compliant Mask Testing using BER Contours
Another feature of 86100CU-401 is its ability to perform mask
testing using specifications BER-contours. This method of mask
testing is used when specifications, such as OIF-CEI 2.0 and XFP,
define mask test requirements based on a defined bit error ratio
for the link. While this type of mask can be modified and tested
using conventional mask testing techniques, the 86100C can now
perform compliant mask testing using both methods. Sampling
scopes, due to their unmatched signal fidelity, are the de facto
standard for mask testing.
Flexible Hardware Configuration
The software application runs on an external PC, or 86100C
DCA-J, running Microsoft Office Excel 2003/2007. It uses any
86100C DCA-J hardware configuration to perform a precision
waveform measurement and imports the data into MS Excel for
further processing. When performing jitter measurements on
high performance devices (RJ < 500 fs), the application is able to
leverage 86100C-200 Enhanced Jitter (Jitter Mode), well known
for its speed and accuracy. Alternatively, the application can also
operate standalone if Jitter Mode is not installed – the choice is
yours!
Overview of Infiniium DCA-J
Features