6
Cisco Aironet Dual-Band MIMO Wall-Mounted Omnidirectional Antenna (AIR-ANT2544V4M-R)
78-20770-01
Installation Notes
Installation Notes
Antennas transmit and receive radio signals which are susceptible to RF obstructions and common
sources of interference that can reduce throughput and range of the device to which they are connected.
Follow these guidelines to ensure the best possible performance:
•Install the antenna vertically and mount it with the cables pointing towards the ground.
•Keep the antenna away from metal obstructions such as heating and air-conditioning ducts, large
ceiling trusses, building superstructures, and major power cabling runs. If necessary, use a rigid
conduit to lower the antenna away from these obstructions.
•The density of the materials used in a building’s construction determines the number of walls the
signal can pass through and still maintain adequate signal strength. Consider the following before
choosing the location for your antenna:
–
Signals penetrate paper and vinyl walls with little change to signal strength.
–
Signals penetrate only one or two solid and pre-cast concrete walls without degrading signal
strength.
–
Signals penetrate three or four concrete and wood block walls without degrading signal
strength.
–
Signals penetrate five or six walls constructed of drywall or wood without degrading signal
strength.
–
Signals will likely reflect off a thick metal wall and may not penetrate it at all.
–
Signals will likely reflect off a chain link fence or wire mesh spaced between 1 and 1 1/2 in.
(2.5 and 3.8 cm). The fence acts as a harmonic reflector that blocks the signal.
•Install the antenna away from microwave ovens and 2-GHz cordless phones. These products can
cause signal interference because they operate in the same frequency range as the device to which
your antenna is connected.

Choosing a Mounting Location

The antenna should be mounted clear of any obstructions to the sides of the radiating elements.
Generally, the higher an antenna is above the floor, the better it performs. If possible, find a mounting
place directly above your wireless device to ensure the lead-in cable can be as short as possible.