Pixel Accurate Reclocking - Lightware UBEX-PRO20-HDMI-F110 User Manual

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10. Technologies 10. Technologies
HDCP v1.4 Source and HDCP v2.2 Sink
The below example is the reversal of the previous case. An HDCP v1.4
compliant source sends a signal with HDCP v1.4 encryption. The
signal is switched to an HDCP v2.2 compliant sink device. In this case
the outgoing signal has to be encrypted with the highest supported
encryption level towards the sink, as the Lightware device and the sink
are both HDCP v2.2 compliant. The HDCP v2.2 standard does not
allow keeping the original HDCP v1.4 encryption level on the output.
What Kind of Signal Will be on the Output of the Lightware Device?
See below table that summarizes the possible cases:
HDCP v1.4
Incoming Signal Compatible Sink
on the Output
HDCP v1.4 HDCP v1.4
HDCP v2.2
HDCP v1.4
(convertible)*
HDCP v2.2 (not
Black screen
convertible)*
* Stream type 0: the video stream allows to convert the signal to apply
a lower level of encryption.
** Stream type 1 (High-value content): the video stream does not allow
to convert the signal.
UBEX series – Extender Application Mode – User's Manual UBEX series – Extender Application Mode – User's Manual
10.3. Pixel Accurate Reclocking
Signal reclocking is an essential important procedure in digital signal
transmission. After passing the reclocking circuit, the signal becomes
stable, jitter-free, and can be transmitted over more equipment like
processors, or event controllers. Without reclocking, sparkles, noise,
and jaggies appear on the image.
Lightware's sophisticated Pixel Accurate Reclocking technology
fixes more problems than general TMDS reclocking. It removes not
only intra-pair skew but inter-pair skew as well. The Pixel Accurate
Reclocking circuit eliminates the following errors:
Intra-pair skew
Skew between the + and - wires within a differential wire pair (e.g.
Data2- and Data2+). It's caused by different wire lengths or slightly
different wire construction (impedance mismatch) in DVI cable. It
results in jitter.
HDCP v2.2.
Compatible Sink
on the Output
HDCP v2.2
Inter-pair skew
HDCP v2.2
Skew between two differential wire pairs in a cable. It is caused by
different wire pair lengths or different number of twists in the DVI
HDCP v2.2 cable. Too much inter-pair skew results color shift in the picture or
sync loss.
Applied F-series endpoint firmware package: v1.4.1 | Applied R-series endpoint firmware package: v1.4.1 | LDC software: v1.34.0b2
Jitter
Signal instability in the time domain. The time difference between two
signal transitions should be a fixed value, but noise and other effects
cause variations.
Noise
Electromagnetic interference between other electronic devices such
as mobile phones, motors, etc. and the DVI cable are coupled onto the
signal. Too much noise results in increased jitter.
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