Extron Electronics DVI 201xi Tx User Guide - Manual (Page 20)

DVI signals run at very high frequency and are especially susceptible to bad video
connections, too many adapters, or cables that are too long. To avoid loss of an image or
introduction of image jitter:
z z The DVI cable on the input to the transmitter or the output from the receiver should not
exceed 10 feet (3 m).
z z Use only cable designed for DVI signals.
z z Limit or avoid the use of adapters, patch panels, or couplers with the input DVI cables,
the output DVI cables, and/or the twisted pair cables. Additional links in the chain will
reduce signal integrity and overall cable length performance.
z z Always turn on the display before the DVI video source in order for the source to retrieve
the DDC from the display.
The source device must be able to obtain EDID information when it is being powered on,
it may not be able to send a video signal or the signal may have the wrong resolution or
refresh rate.
z z Ensure that the DDC are configured correctly for the EDID source (see DDC Switches on
page 6 and Configuring EDID on page 10).
z z The source device must be powered on after the display device providing the EDID
source has been powered on.
Incorrect color or tint — Ensure that the twisted pair cables are terminated correctly and to
the same standard on both ends of the cable (see
Terminating shielded cable on page 7).
Display device displays a flashing black or blue screen, snow or other distortion — A
device that is not HDCP compliant may be receiving HDCP-encrypted signals.
The DVI 201xi Tx is only compatible with High-Bandwidth Digital Content Protection (HDCP)
signals when the EDID Minder is disabled. HDCP signals can be passed through to only one
display (remote or local) and only that display will show the signal correctly.
Signal on local monitor but not on remote display — Check that both output devices
(local and remote) can handle resolutions equal to or greater than the EDID source.
DVI 201xi Tx • Configuration and Operation 14