Cisco Cisco Aironet 1400 Wireless Bridge Guía De Instalación

Do dress properly—shoes with rubber soles and heels, rubber gloves, long sleeved shirt or 
jacket.

If the assembly starts to fall, get away from it and let it fall. Remember, the antenna, mast, cable, 
and metal guy wires are excellent conductors of electrical current and may touch power lines.

If any part of the antenna system comes in contact with a power line, don’t touch it or try to remove 
it yourself. Call your local power company. They can remove it safely.

If an accident occurs with the power lines, call for qualified emergency help immediately.

Choosing a good mounting location for the bridge is important because it affects the reliability of the 
wireless link and maximum data rates it can support. The most important considerations are distance 
between bridges and clearance from obstacles.

In an environment without obstacles in the signal path, the maximum distance between bridges depends 
primarily on the type of antennas and the free space loss between them. Make sure your proposed 
mounting site is within range of the remote antenna. The bridge supports 54-Mbps data rates at distances 
of up to 7.8 miles and 6 Mbps at distances up to 15.5 miles when using the integrated 22.5-dBi antenna 
on both bridges. When using a 9-dBi omni antenna at the hub and an integrated 22.5-dBi antenna 
remotely, the bridge supports 54-Mbps at distances up to 2 miles. Cisco.com has a range calculation tool 
for outdoor bridges that helps you estimate the range for your specific installation. To access the tool go 
this URL: 

http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps458/prod_technical_reference09186a0
0800a912a.xls

.

The integrated antenna radiates and receives polarized radio signals. Polarization helps reduce 
interference because the antenna tends to reject cross-polarized signals from other sources. Therefore, 
you can solve some interference problems by changing the antenna polarization. For the link to operate 
correctly, two antennas at each end of the link must always be set for the same polarization, either 
vertical or horizontal.

The bridge mounting hardware accommodates either vertical or horizontal antenna polarization. For 
more information, see the 

.

A radio beam travels from one bridge to another in a straight line. Therefore, the path between the 
antennas must be free of major obstacles. The effects of obstacles and terrain, both along and near the 
path, have a significant bearing on the propagation of radio signals and can cause both interference and 
signal cancellation.

When choosing a site, consider the effects of the following common obstacles:

Trees and large plants