Extron-electronics DVI 201 User Guide User Manual download pdf (Page 32)

Technical Points for Digital Video and Content Protection Encryption

• Digital Visual Interface (DVI) is a digital video format that was created by the

computer industry in 1999.

• High Deﬁnition Multimedia Interface (HDMI

) is a multimedia format that was

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 DVI 201 fully supports either format,

regardless of the connector type on the video source and display. See Reference

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 DVI 201 actively buffers the HDCP key.

Troubleshooting

DVI signals run at a very high frequency and are especially susceptible to bad video

connections, too many adapters, or cables that are too long. To avoid the loss of an image

or introduction of image jitter, follow these guidelines:

• The DVI cable on the input to the transmitter or the output of the receiver should not

exceed 10 feet (3 m).

• Use only cable designed for DVI signals.

• Limit or avoid the use of adapters or patch points between the transmitter and receiver.

• If the display exhibits a ﬂashing black or blue screen, snow, or other distortion, a non-

HDCP compliant display may be receiving an HDCP-encrypted signal.

Check for an HDCP problem by ejecting the DVD from the player. If the display

distortion stops and the DVD menu or screen saver image is clear, the problem is

HDCP-related.

• If image artifacts are present, the TP cable may be the cause. Extron recommends

DTP26 cable.

• The DVI 201 works as described in point-to-point applications. Do not use any

additional adapters, patch panels, or couplers with the input DVI cables, output DVI

cables, and twisted pair cables. Additional links in the signal chain can result in the

reduction of signal integrity and overall cable length performance.

DVI 201 • Installation and Operation 28

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Extron-electronics DVI 201 User Guide User Manual Page 32

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