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Crestron QM-MD5x1 QuickMedia™ Matrix Switcher/Mixer
CAUTION: Possible equipment damage if miswired.
NOTE: When installing network wiring, refer to the latest revision of the wiring
diagram(s) appropriate to your specific system configuration, available from the
Crestron website.
NOTE: Do not power up system until all wiring is verified. Care should be taken to
ensure data (Y, Z) and power (24, G) connections are not crossed.
When calculating the wire gauge for a particular Cresnet run, the length of the run
and the Cresnet power usage of each Cresnet unit to be connected must be taken into
consideration. If Cresnet units are to be daisy-chained on the run, the Cresnet power
usage of each network unit to be daisy-chained must be added together to determine
the Cresnet power usage of the entire chain. The length of the run in feet and the
Cresnet power usage of the run should be used in the following resistance equation
to calculate the value on the right side of the equation.
Resistance Equation
R = Resistance (refer to the following table).
L = Length of run (or chain) in feet.
P = Cresnet power usage of entire run (or chain).
R <
L x P
40,000
Where:
The required wire gauge should be chosen such that the resistance value is less than
the value calculated in the resistance equation. Refer to the table after this paragraph.
Wire Gauge Values
RESISTANCE (R) WIRE GAUGE
4
16
6
18
10
20
15
22
13
Doubled CAT5
8.7
Tripled CAT5
NOTE: All network wiring must consist of two twisted pairs. One twisted pair is
the +24V conductor and the GND conductor. The other twisted pair is the Y and Z
conductors.
NOTE: When daisy-chaining Cresnet units, strip the ends of the wires carefully to
avoid nicking the conductors. Twist together the ends of the wires that share a pin on
the network connector, and tin the twisted connection. Apply solder only to the ends
of the twisted wires. Avoid tinning too far up the wires or the end becomes brittle.
Insert the tinned connection into the Cresnet connector and tighten the retaining
screw. Repeat the procedure for the other three conductors.
NOTE: For larger networks (i.e., greater than 28 network devices), it may become
necessary to add a Cresnet Hub/Repeater (CNXHUB) to maintain signal quality
throughout the network. Also, for networks with lengthy cable runs, it may be
necessary to add a Hub/Repeater after only 20 devices.
Operations Guide - DOC. 6300 QuickMedia™ Matrix Switcher/Mixer: QM-MD5x1 • 15