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Keysight Technologies
W2641A DisplayPort
Test Point Access Adapter
Data Sheet
Connect to your DisplayPort device to make
physical layer parametric measurements
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02 | Keysight | W2641A DisplayPort Test Point Access Adapter - Data Sheet
Emerging standards for consumer
electronic devices and entertainment equipment provide for higher
screen resolutions than ever
before, which meets the market
need for the highest computer
monitor viewing quality possible.
High screen resolutions necessitate higher link rates which place
new demands on the source,
sink and media such as cable or
PC boards. This electrical signal
environment makes measurement
of physical layer parameters even
more important and at the same
time, more dif cult. The Keysight
Techologies W2641A DisplayPort
test point access adapter provides unrivaled convenience and
performance.
DisplayPort standard
The evolution of the DisplayPort
standard, sponsored by VESA1, was
driven by demand for higher-resolution
and less-expensive computer displays. Computer industry insiders
have long believed that the industry
would ultimately shift to all digital
at-panel displays, and DisplayPort is
the digital transport interface stan-
dard that nally promises to supplant
the popular VGA CRT monitor. The
low-prole DisplayPort connector is
ideal for crowded back panels, motherboard designs able to drive multiple
monitors, and portable equipment
that offers uncompromised viewing.
The DisplayPort connector has been
designed to support the high DisplayPort bit rates now and in the future. It
is likely that DisplayPort will become
the primary video interface for desktop
and laptop personal computers, and
it may ultimately be used in consumer
electronics equipment such as DVD
players.
The DisplayPort standard covers a
wide range of screen resolutions and
physical congurations. It outlines
tests for the high-speed digital signals
for source and sink testing, low-frequency control path (the AUX channel),
link -layer and protocol verication
such as HDCP (high bandwidth content
protection) and media evaluation.
Impedance vs location can be analyzed on your DisplayPort designs
1. Video Electronics Standards Association (www.vesa.org)
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03 | Keysight | W2641A DisplayPort Test Point Access Adapter - Data Sheet
Test point access adapters
Test point access adapters (TPA)
should be as transparent as possible
to each measurement, connect to a
wide range of test product form factors, and have the exibility to measure several parameters. The W2641A
TPAs have low loss, very good impedance characteristics and low intra-pair
and inter-pair skew to provide the high
signal delity connection required.
These TPAs have been designed to
conveniently connect to DisplayPort
receptacles without obstructing cables or presenting a footprint near the
device under test greater than the DisplayPort receptacle connector itself.
W2641A DisplayPor t test point access
adapters provide the widest bandwidth and best performance on the
market, thus enabling you to see the
nuances of your source eye diagrams,
printed circuit board and connector
impedance proles and evaluate your
DisplayPort sink performance.
Pair a W2641A TPA with a Keysight N49 03A J-BERT or 81250 ParBERT for DisplayPort sink validation.
Use the Keysight 86100 C and 86100D digital communication analy zer
with a W2641A TPA for transmission line impedance analysis.
Use a Keysight Inniium DSO90000 or DSOX90000 Series oscilloscope with a W26 41A TPA for DisplayPort source validation.
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04 | Keysight | W2641A DisplayPort Test Point Access Adapter - Data Sheet
DisplayPort source testing
The DisplayPort Physical Layer Com-
pliance Test Specication (CTS) covers
source tests such as level verication,
pre-emphasis level, skew, jitter, data
eye, transition time and many other
parameters. When you pair W2641A
TPAs with Keysight Technologies’
Inniium 90000 or 90000 X-Series
oscilloscopes and the U7232A DisplayPort compliance test software, you will
have uncompromised accuracy and
unrivaled simplicity in characterizing
your source design. The TPA’s excellent
performance enables you to clearly see
nuances in the transmitted pattern and
determine how to improve the performance of the source and channel. The
U7232A DisplayPort compliance test
software automates measurements of
the multitude of parameter congurations possible in DisplayPort devices
and provides you with an extensive
report on how the devices have performed. The U7232A is designed for
use in validation and compliance labs
so you can use the full measurement
suite before you submit your devices to
a DisplayPort Authorized Test Center
for certication to make sure you’ve
taken care of problems in advance.
DisplayPort AUX channel
testing
The DisplayPort specication includes
a special channel, the AUX channel, which is used to dynamically
coordinate the link source and sink.
The W2641A exposes this differential
lane that operates at 1 Mbs with two
connections available: one using the
standard SMP connectors used in the
high-speed lanes and another on a
digital interface header. Also available
on the digital interface header are
power supply lines and the hot plug
detect (HPD) line, which can also be
probed for noise measurements, triggering, etc.
DisplayPort sink testing
The DisplayPort Physical Layer Com-
pliance Test Specication stipulates
a receiver tolerance test regimen
where the digital data is transmitted
with phase jitter having sinusoidal
and random characteristics, as well
as a calibrated channel degradation
(called intersymbol interference, or
ISI). The signal parameters, such as
jitter quantity and level, vary according to the bit rate being tested. These
signals can be injected to a DisplayPort sink from Keysight sources such
as the N4903A JBERT and the 81250
ParBERT through the W2641A.
For the calibration of the sink test setup, a complementary receptacle test
xture is needed. This is available as a
third party product BIT-DP-RTF-0001
from BitifEye Digital Test Solutions,
(see www.bitifeye.com). The same
product is needed for testing socalled tethered devices, i.e. devices
such as monitors with DisplayPort cables inseparably connected to them.
To facilitate automated measurements
and process control, the N5990A test
automation software platform offers
automated DisplayPort compliance
and characterization tests.
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05 | Keysight | W2641A DisplayPort Test Point Access Adapter - Data Sheet
DisplayPort device
connection
The W2641A connects directly into
a DisplayPort receptacle connector such as found on graphic cards,
motherboards and on PCs. The xture
was designed to reduce possibility of
interference to other connectors and
cable types. Even so, there are always
connection congurations where interference is seen or where perpendicular
entry to the W2641A is inconvenient or
impossible. To address some of these
conditions, the W2641A DisplayPort
Adapter xture comes with highly
exible cables with constant imped-
ance characteristics even when acutely
bent. A diagram of such a test setup
is shown below and the impedance
difference is shown adjacent. It is clear
that no degradation in measurement
accuracy is seen.
Extra convenience in connection is
afforded by the addition of the N5460A
cables, which have a right angle SMP
connection. These are phase matched
to less than 2ps and have superior
impedance and loss characteristics.
DisplayPort media testing
The W2641A Test Point Adapter can
also be used to evaluate motherboard
trace layout and connector design by
connecting to a DisplayPort receptacle
connector. With this connection a vector network analyzer or a TDR may be
used to evaluate your design. To aid in
this analysis, TRL calibration structures
are provided for de-embedding the
xture – such a de-embed process will
move the reference plane of measurement to the plug pins of the mated
connection (receptacle mated with the
adapter’s plug) to afford the utmost
accuracy.
Less than 1% impedance change for bent cable
W2641A with N5460A SMP right angle cable
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06 | Keysight | W2641A DisplayPort Test Point Access Adapter - Data Sheet
W2641A test accessories
Model number Description
N5460A Phase matched pairs: right-angle SMP
to SMA male (recommended, options)
E4809-23801 Cable plug-in tool (optional) 1
E4809-23802 Cable removal tool (required for right angle
SMP cables)
N4235-61602 Phased matched pair: SMP to SMA cables (stan-
dard replacement cables for W2641A)
Quantity
1, 2, 4
1
2, 4, 8
Test accessories
Model number Description
11667B Power splitter, DC to 26.5 GHz, 3.5-mm (f) connectors
11636B
8493B Coaxial attenuator (3, 6, 10, 20 or 30 dB), DC to 18 GHz, SMA con-
1250-1158 SMA (f - f) adapter, DC to 18 GHz
1250-1159 SMA (m - m) adapter, DC to 18 GHz
Power divider, DC to 26.5 GHz, 3.5-mm (f) connectors
nector
1250-1397 Right-angle adapter, SMA (m - m)
1250-1741 Right-angle adapter, SMA (f - m)
1250-1698 SMA tee adapter (m, f, f), DC to 12.4 GHz
1250-1694 SMA (m) to SMA (f) Adapter
15442A Cable kit, four 90-cm (36-inch) SMA (m - m) cables
15443A Matched cable pair, two 90-cm (36-inch) SMA (m - m) cables,
propagation delay within 25 ps
1810-0118 SMA (m) 50 Ω termination
33SMA-Q50-0-4 SMA push-on adaptors from S.M. Electronics (or equivalent)
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07 | Keysight | W2641A DisplayPort Test Point Access Adapter - Data Sheet
Related literature
Publication title Publication type Publication number
Infiniium 90000 Series Oscilloscopes
and 1160 Series Probes
U7232A DisplayPort Compliance Test
Software
Keysight m ethod of impleme ntation for
DisplayPor t sink compliance test
N4903A JBERT Data Sheet 5989-2899EN
N4915A-006 DisplayPort ISI generator Data Sheet 5989-8688EN
ParBERT TMDS generator Data Sheet 5989-5537EN
N5990A Test automation software Data Sheet 5989-5483EN
Infiniium 90000 X-Series oscilloscopes Data sheet 5990 - 5271EN
86100D Technical Specifications Data sheet 5990-5824EN
Data Sheet 5989-7819EN
Data Sheet 5989-7198EN
Application Note 59 8 9 -9147EN
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08 | Keysight | W2641A DisplayPort Test Point Access Adapter - Data Sheet
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Published in USA, July 31, 2014
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