FrontRow Lasso, Installer'S Manual

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12
Step 4:
Plan your installation (Sensors)
The FrontRow Lasso system uses infrared light to transmit the voice signal from the microphone to the sensor in the
ceiling/wall sensors. Proper placement of the sensors is critical for optimal system performance.
SENSOR CABLE
The sensor cables are sensitive to electrical noise.
• DO NOT use a splitter with the sensor cable.
• AVOID routing the sensor cable next to other cables or electrical systems (e.g., other electrical conduit, Ethernet
cable, video cable, fluorescent light ballast, etc.). Leave at least 6 in. (15cm) space around the sensor cable.
• Excess cable can be coiled, tied and placed safely in a plenum space. DO NOT place the sensor coil near other
cables or electrical systems (e.g., other electrical conduit, Ethernet cable, video cable, fluorescent light ballast, etc.).
• Local regulations may require plenum-rated cable if used in a plenum space.
• FrontRow recommends using the factory-supplied sensor cables; however, if you need to shorten or
lengthen cables to meet the needs of a specific job, observe the following guidelines for best results:
Sensor Mounting
• DO NOT mount the ceiling sensor or wall sensors in
direct sunlight as it will greatly reduce performance.
• The ceiling sensor must have a clear view of the
coverage area and must be mounted parallel
to the floor to function optimally (see figure). If
drop lights are used in the room, wall sensors or
IR speakers may be a better option. Or, a drop
mount* may be used to lower the ceiling sensor.
Light
Fixture
Ceiling Sensor
Orientation and
coverage optimized
*
*drop mount
not supplied by FrontRow
Classroom
Ceiling
Sensor
X Sensor performance reduced:
Not parallel to floor AND blocked
by light fixtures.
Ceiling Sensor Installation
Sensor cable
Receiver
Amplifier
Interference and IR Coverage
• Adjacent classrooms that use FrontRow infrared systems can interfere with each other if the rooms are
separated by windows. The windows allow the infrared light to “escape” from the classroom only to be picked
up by the sensors in the adjacent classroom, causing interference and “cross talk”. Be sure to recommend
window coverings to the greatest extent practical when using the system.
• Infrared light reflects better off of white and glossy surfaces. The ceiling sensor can be placed to help provide
coverage in areas where the signal may be weak due to insufficient infrared reflection.
Sensor symbols:
= ceiling sensor
= wall sensor
SENSOR TYPE GUIDELINE EXAMPLES
IR Speakers only
Ceiling sensor only
IR Speaker with
1 ceiling sensor
Lengths can differ by
up to 40ft/12m
Lenths can differ by
up to 30ft/9m
Ceiling sensor cable
can be 25ft shorter
than up to 50ft longer
than the
shortest IR
Speaker cable
Combo A is 50 feet
•
Combo B is 10 feet
Combo A is 70 feet
•
Combo B is 30 feet
Ceiling Cable A is 50 ft
•
Ceiling Cable B is 20 ft
Ceiling Cable A is 50 ft
•
Ceiling Cable B is 80 ft
Ceiling Cable A is 40 ft
•
Ceiling Cable B is 10 ft
Combo A is 50 ft
•
Combo B is 50ft
•
Ceiling Cable is 25ft
Combo A is 50 ft
•
Combo B is 50ft
•
Ceiling Cable is 100ft
Combo A is 50 ft
•
Combo B is 25ft
•
Ceiling Cable is 75ft
Combo A is 30 ft
•
Combo B is 60ft
•
Ceiling Cable is 80ft
CAVEATS: Avoid lengths >100ft/30.5m
•
Any extensions must be RG-59U with at least 90% shielding (double
recommended) with proper connectors
•
FrontRow is not responsible for performance when cables are altered.