Crestron QM-DA Specifications download pdf (Page 12)

QuickMedia™ Distribution Amplifier Crestron QM-DA

The aggregate cable length of a signal path originating at a QM transmitter and

terminating at a QM receiver 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.

QM Network Topology

TPS-12G/15G-QM-L

QM-TX

Origination Points Endpoints

Midpoints

QM-FTDC

QM-DAQM-MD7x2

TPS-12G/15G-QM-L

Installation

Ventilation

The QM-DA should be used in a well-ventilated area. The venting holes should not

be obstructed under any circumstances.

To prevent overheating, do not operate this product in an area that exceeds the

environmental temperature range listed in the table of specifications. Consider using

forced air ventilation and/or incrementing the spacing between units to reduce

overheating. Consideration must be given if installed in a closed or multi-unit rack

assembly since the operating ambient temperature of the rack environment may be

greater than the room ambient temperature. Contact with thermal insulating materials

should be avoided on all sides of the unit.

Rack Mounting

The QM-DA can be mounted in a rack or stacked with other equipment. Two “ears”

are provided with the QM-DA so that the unit can be rack mounted. These ears must

be installed prior to mounting. Complete the following procedure to attach the ears

to the unit. The only tool required is a #2 Phillips screwdriver.

8 • QuickMedia™ Distribution Amplifier: QM-DA Operations Guide – DOC. 6547A

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Crestron QM-DA Specifications Page 12

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