User's Manual

Power Consumption, Connections and Power Supplies I P/N 709C011101 I Page 11
2.5 Power Consumption, Connections and Power
Supplies
2.5.1 Power Safety Instructions
SAFETY WARNINGS
When installing or selecting the power supplies:
• It is required to install a circuit breaker of 7.5A for the DC supply circuit.
• Be sure to disconnect all power sources before servicing.
• Calculate the required power according to the requirements of the specific installation and
then determine the configuration of the power supplies. The required DC cables will then be
determined by the selected PS configuration.
• Use only UL approved power supplies
• AC and DC power supply cables – only use the power cords supplied with the units
2.5.2 Types of Power Supplies
CMA supplies various power supplies that can be installed in a rack or mounted on a wall,
depending on your configuration.
2.6 Installation Conventions
Some of the basic installation conventions are listed below for the QX system:
• QX - usually placed in the communication shaft or closet of a corresponding floor so they
can be easily located. Each QX unit can typically cover a floor of up to 30,000 sq ft.
• Fiber optic cable - bundled fibers are terminated into the Base Units/Optical Control Hubs
in the main communication room. The fibers are then routed to each coverage locations
where individual fibers terminate into splice boxes. The splice box couples the installed fiber
into the remote units. Enough spare fibers should be installed to take into account future
expansion of the system.
• For remote power supply configuration - cable bundles are routed from the main
communication room and individual wire pairs are terminated into the power feed of
individual units.
By providing power from a single distribution point, maintenance can be reduced and UPS
backup can be easily provided. The maximum distance from the source to the termination
spot is 1000 feet using 18 gauge wires.
In many locations local codes do not require power to be run through conduit if 100 watts
or less is used. Please consult the regulations in your local jurisdiction prior to deploying
remote power. When power cables require distances greater than 1000 feet 14 or 16
gauge wire may be used.
• On each floor - the antennas are connected to the Service Combiner Unit (SCU) using
coax cables.