Crestron
QM-WMC
Wall Plate Media Center
Resistance Equation
R = Resistance (refer to table below).
L = Length of run (or chain) in feet.
PF = Power factor of entire run (or chain).
R < L x PF
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
following table.
Wire Gauge Values
RESISTANCE (R)
WIRE GAUGE
4
16
6
18
10
20
15
22
13
Doubled CAT5
8.7
Tripled CAT5
NOTE:
All Cresnet wiring must consist of two twisted-pairs. One
twisted pair is the +24V conductor and the GND conductor and the other
twisted pair is the Y conductor and the Z conductor.
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 plug and tighten the retaining
screw. Repeat the procedure for the other three conductors.
NOTE:
When using Crescat-QM wiring, a cable containing 4 wire pairs
is included for making QuickMedia connections.
QuickMedia Wiring
The Crestron QuickMedia cable (sold under the name “Crescat-QM”)
contains one CAT5E cable and one Cresnet cable in siamese jackets.
Installation of any QuickMedia device is as simple as installing one set of
Operations & Installation Guide - DOC. 6237A
Wall Plate Media Center: QM-WMC
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