Crestron
CAT5 Wiring
Reference
Guide
QuickMedia Cable – CRESCAT-QM
The QuickMedia receiver performs frequency compensation on each video input to
compensate for skew. Signal skew occurs when part of the signal is delayed with
respect to other signal components. The amount of skew largely depends on the
length of the QuickMedia cable. Unequal wire lengths are created because CAT5
consists of twisted pairs that are twisted together in the cable.
The total accumulated skew from QM transmitter to QM receiver must not exceed 15
ns (nanoseconds). Crestron recommends a cable with a rating of less than or equal to
15 ns over its entire length.
For example, if using a cable with a rating of 15 ns/100 meters (100 meters = 328
feet), connecting the QM-WMC/QM-WMIC QM transmitter with 150 ft. of cable to
a QM-MD7x2 switcher, and then using another 150 ft. to connect the QM-RMCRX
receiver, the accumulated skew over the entire 300 feet should not exceed 15 ns.
QuickMedia allows composite and S-video resolutions of 800 x 600 to 1600 x 1200
at 60 Hz. Longer lengths of cable may experience a loss of bandwidth when viewing
at high video resolutions.
The pin assignment is based on the EIA/TIA 568B RJ-45 Jack standard.
Reference Guide – DOC. 6137A
Crestron CAT5 Wiring
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