Cisco Aironet 1520 Series Manual de introducción - Página 21
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To avoid receiver damage and PER degradation, you can use one of the following techniques:
• Separate the omnidirectional antennas by at least 2 ft (0.6 m) to avoid receiver damage or by at
least 25 ft (7.6 m) to avoid PER degradation.
These distances assume free space path loss and are conservative estimates. Required
Note
separation distances for damage and performance degradation levels in actual
deployments will be less due to non line-of-sight propagation conditions.
• Reduce the configured transmit power to the minimum level.
• Use directional antennas and keep them pointed away from each other.
• Cable the radios together using a combination of attenuators, combiners, or splitters to achieve a
total attenuation of at least 60 dB.
For a radiated test bed, the following equation describes the relationships among transmit power,
antenna gain, attenuation, and receiver sensitivity:
txpwr + tx gain + rx gain - [attenuation due to antenna spacing] < max rx input level
Where:
txpwr = Radio transmit power level
tx gain = transmitter antenna gain
rx gain = receiver antenna gain
For a conducted test bed, the following equation describes the relationships among transmit power,
antenna gain, and receiver sensitivity:
txpwr - [attenuation due to coaxial components] < max rx input level
Under no circumstances should you connect the antenna port from one access point to the
Caution
antenna port of another access point without using an RF attenuator. If you connect
antenna ports you must not exceed the maximum survivable receive level of 0 dBm. Never
exceed 0 dBm or damage to the access point can occur. Using attenuators, combiners, and
splitters having a total of at least 60 dB of attenuation ensures that the receiver is not
damaged and PER performance is not degraded.
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