Crestron qm-ae Manuel D’Utilisation
Crestron QM-AE
QuickMedia™ Audio Extractor
QuickMedia Transport System
Using a new, proprietary signal routing solution, signals such as composite
video, S-video, RGBHV, audio, and microphone are all transported using a
single cable solution called QuickMedia (QM).
video, S-video, RGBHV, audio, and microphone are all transported using a
single cable solution called QuickMedia (QM).
The QM transport system port is capable of managing computer, video, and
audio signals simultaneously through one CresCAT-QM UTP (unshielded
twisted pair) wire, simplifying installations.
audio signals simultaneously through one CresCAT-QM UTP (unshielded
twisted pair) wire, simplifying installations.
Routing CresCAT-QM UTP cable is less expensive and much simpler than
routing multi-colored, multi-conductor coax cable. All Crestron products using
the QM transport system are capable of sending and receiving QM signals via
standard CresCAT-QM cable. Installation of any QM device is as simple as
installing one set of QM wires from output to input. Installations are flexible,
affordable, and fast.
routing multi-colored, multi-conductor coax cable. All Crestron products using
the QM transport system are capable of sending and receiving QM signals via
standard CresCAT-QM cable. Installation of any QM device is as simple as
installing one set of QM wires from output to input. Installations are flexible,
affordable, and fast.
The Crestron QuickMedia cable “CresCAT-QM” contains one CAT5E cable
and one Cresnet
and one Cresnet
®
cable in siamese jackets.
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.
(0.84 – 1.27 cm) when making a connection. The twists are critical to canceling
out interference between the wires.
The QuickMedia transport mechanism performs delay compensation on each
video input to compensate for signal skew, and frequency/bandwidth
compensation for cable length. Signal skew occurs when part of the signal is
delayed with respect to other signal components. The amount of skew largely
depends on the length and the design of the wire. Because CAT5 consists of
twisted pairs that are twisted together in the cable, unequal wire lengths are
created.
video input to compensate for signal skew, and frequency/bandwidth
compensation for cable length. Signal skew occurs when part of the signal is
delayed with respect to other signal components. The amount of skew largely
depends on the length and the design of the wire. Because CAT5 consists of
twisted pairs that are twisted together in the cable, unequal wire lengths are
created.
The maximum aggregate cable length from QM transmitter to QM receiver is
limited by the loss of bandwidth over long distances and the amount of available
skew compensation. A cable rated at 22 ns of skew per 100 meters (328 ft.)
means that a cable will have no more than a 22 ns difference between the fastest
and slowest RGB signals over 100 meters of cable.
limited by the loss of bandwidth over long distances and the amount of available
skew compensation. A cable rated at 22 ns of skew per 100 meters (328 ft.)
means that a cable will have no more than a 22 ns difference between the fastest
and slowest RGB signals over 100 meters of cable.
To determine the allowable maximum length of installed cable, the installer
must first perform a calculation based on the skew rating of the cable.
must first perform a calculation based on the skew rating of the cable.
Skew compensation is primarily relevant to RGB sources; however, any/all
video or VGA 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 particular to either Crestron and/or QuickMedia
systems. To ensure sufficient bandwidth to support signal resolutions up to
1600 x 1200, the maximum aggregate cable length should not exceed 328 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. Refer to page 9 for
additional QM network wiring information.
video or VGA 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 particular to either Crestron and/or QuickMedia
systems. To ensure sufficient bandwidth to support signal resolutions up to
1600 x 1200, the maximum aggregate cable length should not exceed 328 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. Refer to page 9 for
additional QM network wiring information.
Operations Guide – DOC. 6331
QuickMedia™ Audio Extractor: QM-AE ●
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