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Crestron TPS-GA-TPI Isys
®
G-Series Touchpanel Interface
Operations Guide – DOC. 6501 Isys
®
G-Series Touchpanel Interface: TPS-GA-TPI • 13
CresCAT-QM Cable
CresCAT-QM
Cable
NOTE: Do not untwist the two wires in a single pair for more than 1/3-1/2”
(0.84-1.27 cm) 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 the TPS-GA-TPI and
terminating at QM endpoint such as a TPS-12G/15G-QM-L 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-MD7x2 or other QM switchers). Refer to the following diagram when
configuring a QM network.
NOTE: The aggregate length from transmitter to receiver cannot have a delay skew
or more than 22 ns.