Specifications

QuickMedia™ Distribution Amplifier Crestron QM-DA-2
CresCAT-QM Cable
CresCAT-QM
Cable
NOTE: Do not untwist the two wires in a single pair for more than 1/3-
1/2” (8–12 mm) when making a connection. The twists are critical to
canceling out interference between the wires.
The aggregate cable length of a signal path originating at a QM
transmitter and terminating at a QM receiver (with a QM-DA-2 in
between) must not exceed 450 feet (137 meters). Video signals may
experience a loss of quality over very long lengths of cable. This
phenomenon is due to the added resistance and capacitance of longer
cable lengths and is not peculiar to either Crestron and/or QuickMedia
systems. To ensure sufficient bandwidth, the maximum aggregate cable
length should not exceed 450 feet. The use of lower-resolution signals
may allow increased cable length but must be tested by the installer with
the sources to be used. The QM pin assignment is based on the EIA/TIA
568B RJ-45 Jack standard.
NOTE: When transmitting S-video, luminance uses the green video
pathway and chrominance uses the red video pathway. When transmitting
composite video, the signal is carried on the blue video pathway.
NOTE: When using CresCAT-QM wiring, four additional wires are
included for making Cresnet connections
.
When connecting multiple QM devices, the route between a QM
origination point (transmitter) and a QM endpoint (receiver) cannot have
more than two midpoints (e.g. QM-DA-2, QM-MD7x2 or other QM
8 • QuickMedia™ Distribution Amplifier: QM-DA-2 Operations Guide – DOC. 6918A