Cisco AIR-BR1410A-A-K9 - Aironet 1410 Wireless Bridge Deployment Manual page 30

3. Power Level – This is the transmitter power setting and is configurable so that the power
can be set appropriately when using higher gain antennas or configuring for really short links
that don't need or require the maximum transmitter power.
4. Data rate – This is the radio data rate, as the data rate is configured to a lower value the
Bridge receiver sensitivity increases permitting further distances.
5. Antenna – When a directional antenna is used, it can focus the radio energy into a
particular direction (known as gain and is expressed in dBi).This value in dBi represents the
increase over an isotropic or (zero gain) antenna. Generally speaking, the lower the gain the
lower the distance and less directional the signal is.
6. Other Antenna – Allows you to manually enter the gain of a non-Cisco antenna or one
that does not appear in the drop down options.
7. Cable Loss / Length – Cisco antennas at 5 GHz have 4.9 Ft of cable and are designed to
connect directly to the 1400 Series Bridge. Should you wish to add to this cable length (not
recommended) you can enter in the loss of the non-Cisco supplied cable as well as the
length.
8. Effective Isotropic Radiated Power – Displayed so the installer can verify compliance
with their countries rules and regulations.
9. Environmental conditions – Allows terrain and atmospheric conditions to be defined so
they can be considered in the distance calculation.
10. Maximum Distance – Displayed in Miles and Kilometers
11. Earth Bulge at above distance – Given a distance this will display how much line of sight
disappears due to the curvature of the Earth. Displayed in Feet and Meters.
12. Fresnel Zone Clearance – Given the distance this is the height of the actual Fresnel Zone.
Displayed in Feet and Meters.
13. Required Antenna Height Above Obstructions – Given Earth Bulge, and estimated
Fresnel Zone Clearance this is how high the antennas should be above ground. Displayed in
Feet and Meters.
14. Recommended Fade Margin – The value displayed in dB Cisco that recommends taking
into account many factors including environmental conditions.
Copyright © 2004 Cisco Systems, Inc. All rights reserved.
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