Crestron qm-ae Manuel D’Utilisation

QuickMedia™ Audio Extractor 

 

Crestron QM-AE 

As of the date of manufacture, the QM-AE has been tested and found to comply 
with specifications for CE marking and standards per EMC and 
Radiocommunications Compliance Labelling. 

          

 

NOTE:  This device complies with part 15 of the FCC rules. Operation is 
subject to the following two conditions: (1) this device may not cause harmful 
interference, and (2) this device must accept any interference received, including 
interference that may cause undesired operation.  

Network Wiring 

CAUTION:  In order to ensure optimum performance over the full range of 
your installation topology, Crestron Certified Wire, and only Crestron Certified 
Wire, may be used. Failure to do so may incur additional charges if support is 
required to identify performance deficiencies as a result of using improper wire. 

CAUTION:  Use only Crestron power supplies for Crestron equipment. Failure 
to do so could cause equipment damage or void the Crestron warranty. 

CAUTION:  Provide sufficient power to the system. Insufficient power can lead 
to unpredictable results or damage to the equipment. Please use the Crestron 
Power Calculator to help calculate how much power is needed for the system 
(

http://www.crestron.com/calculators

).

 

When calculating the length of wire for a particular Cresnet run, the wire gauge 
and the Cresnet power usage of each network unit to be connected must be taken 
into consideration. Use Crestron Certified Wire only. 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. If the unit is a home-run from a Crestron system power supply 
network port, the Cresnet power usage of that unit is the Cresnet power usage of 
the entire run. The wire gauge and the Cresnet power usage of the run should be 
used in the following equation to calculate the cable length value on the 
equation’s left side. 

40,000

Where:  

R x P

L <

L = Length of run (or chain) in feet.                                        
R = 6 Ohms (Crestron Certified Wire: 18 AWG (0.75 MM

2

))  

P = Cresnet power usage of entire run (or chain).

 

Make sure the cable length value is less than the value calculated on the right 
side of the equation. For example, a Cresnet run drawing 20 watts should not 
have a length of run more than 333 feet.   

NOTE:  All Crestron certified 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.