W2641A Datasheet, PDF (4/8 Pages) Agilent(Hewlett-Packard) – DisplayPort Test Point Access Adapter

DisplayPort source testing
The DisplayPort Physical Layer Compliance Test Specification (CTS) covers
source tests such as level verification, pre-emphasis level, skew, jitter, data
eye, transition time and many other parameters. When you pair W2641A TPAs
with Agilent’s DSO90000 Infiniium 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
configurations 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 certification
to make sure you’ve taken care of problems in advance.
DisplayPort AUX channel testing
The DisplayPort specification 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 Compliance Test Specification 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 Agilent 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 fixture
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 so-called 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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