Cisco Cisco Aironet 1522 Lightweight Outdoor Mesh Access Point Guide De Montage
20
Tip
When power is not readily available during a site survey, use an unrestricted power supply
(UPS) to temporarily power the mesh link.
(UPS) to temporarily power the mesh link.
Consider the following operating and environmental conditions when performing a site survey:
•
How far is your wireless link?
•
Has a previous site survey been conducted?
•
Do you have a clear Fresnel zone between the access points or radio line of sight?
•
What is the minimum acceptable data rate within the link?
•
Do you have the correct antenna?
•
Do you have access to both of the mesh site locations?
•
Do you have the proper permits, if required?
•
Do you have a partner? Never attempt to survey or work alone on a roof or tower.
•
Have you configured the access points before you go onsite? It is always easier to resolve
configurations or device problems first.
configurations or device problems first.
•
Do you have the proper tools and equipment to complete your survey?
Avoiding Damage to Radios in a Testing Environment
The radios on outdoor units (bridges) have higher transmit power levels than radios on indoor units
(access points). When you test high power radios in a link, you must avoid exceeding the receiver’s
maximum receive input level. At levels higher than the normal the receiver’s operating range, packet
error rate (PER) performance is degraded. At even higher levels, the receiver can be permanently
damaged.
(access points). When you test high power radios in a link, you must avoid exceeding the receiver’s
maximum receive input level. At levels higher than the normal the receiver’s operating range, packet
error rate (PER) performance is degraded. At even higher levels, the receiver can be permanently
damaged.
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.
least 25 ft (7.6 m) to avoid PER degradation.
Note
These distances assume free space path loss and are conservative estimates. Required
separation distances for damage and performance degradation levels in actual
deployments will be less due to non line-of-sight propagation conditions.
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.