System Operation; Technical Points For Digital Video And Content Protection Encryption - Extron electronics HDMI 201 User Manual

System Operation

After the transmitter, the receiver, and their connected devices are powered up, the system
is fully operational. If any problems are encountered, ensure all cables are routed and
connected properly.
NOTE: Ensure that the video source and display selected for the DDC are properly

Technical Points for Digital Video and Content Protection Encryption

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connected to the transmitter/receiver pair, and that the transmitter, the receiver,
and the display have power applied before power is applied to the video
source. If all other devices are not turned on before the video source, the
image may not appear.
Digital Visual Interface (DVI) is a digital video format that was created by the
computer industry in 1999.
High Definition Multimedia Interface (HDMI
created by the consumer video industry in 2003.
о The HDMI format is built onto the DVI format, adding digital audio and control
while reducing the size of the connector.
о
The HDMI format is likely to replace the DVI format in the near future.
о With passive adapters, the HDMI format is backward compatible with the DVI
format.
With Extron adapters, cables, or both, the HDMI 201 fully supports either format,
regardless of the connector type on the video source and display. See
Information
for part numbers.
High-bandwidth Digital Content Protection (HDCP) is an encryption method that
protects copyrighted digital entertainment material that uses DVI video.
о
HDCP is generated by video player hardware, enabled by the video content.
о The HDCP key is transmitted with the Display Data Channel (DDC).
о
The DDC signal line was designed for the low data rate of the DDC; the HDCP key
rate is much higher.
Without active buffering, an HDCP key signal can travel only a short distance. The
display may properly receive the digital video signal, but not the HDCP key. Without
the key, the display cannot decrypt the video signal. Symptoms of undecrypted video
may include a flashing black or blue screen or "snow".
With active buffering, an HDCP key signal can travel as far as other signals to
ensure proper decryption.
The HDMI 201 actively buffers the HDCP key.
) is a multimedia format that was
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HDMI 201 • Installation and Operation
Reference
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