Cisco Aironet 1570 Series Руководство по установке оборудования - Страница 7

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Chapter 2

Preparing for Installation

Safety Instructions for Antennas and Radios

Warning

In order to comply with radio frequency (RF) exposure limits, see

Conformity and Regulatory

your local regulatory domain. Statement 339

Warning

Do not locate the antenna near overhead power lines or other electric light or power circuits, or

where it can come into contact with such circuits. When installing the antenna, take extreme care

not to come into contact with such circuits, because they may cause serious injury or death. For

proper installation and grounding of the antenna, please refer to national and local codes (for

example, U.S.: NFPA 70, National Electric Code, Article 180, Canada: Canadian Electrical Code,

Section 54). Statement 1052

Warning

Only trained and qualified personnel should be allowed to install, replace, or service this

equipment. Statement 1030

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 maximum

receive input level for the receiver. At levels above the normal 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:

•

Note

OL-32138-01

When installing your antenna, follow these guidelines:

–

Do not use a metal ladder.

–

Do not work on a wet or windy day.

–

Do dress properly—wear shoes with rubber soles and heels, rubber gloves, and a long-sleeved

shirt or jacket.

If the assembly starts to drop, move away from it and let it fall. Because the antenna, mast, cable,

and metal guy wires are all excellent conductors of electrical current, even the slightest touch of any

of these parts to a power line completes an electrical path through the antenna and the installer.

If any part of the antenna system should come in contact with a power line, do not touch it or try to

remove it yourself. Call your local power company to have it removed safely.

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

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 separation

distances for damage and performance degradation levels in actual deployments are less if

conditions are not non-line-of-sight

Cisco Aironet 1570 Series Outdoor Access Point Hardware Installation Guide

Information", to find the safe operating distance as required for

Safety Instructions for Antennas and Radios

Appendix B, "Declarations of

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