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CCNP Wireless Quick Reference: How to Collect Information for the Wireless Site Survey

Contents

  1. Identify Customer Requirements
  2. Common Needs for Common Verticals

Chapter Description

Conducting a wireless site survey is the final step of a carefully planned journey. This chapter helps you prepare for this site survey by listing the pieces of information that you need to collect before meeting your customer and planning the survey itself.

Common Needs for Common Verticals

Although there may be infinite variations of what type of usage your client intends for the wireless network, some verticals have “typical” needs, related to the history of wireless in this vertical. Table 1-1 shows popular choices for some wireless markets. Notice that all three technologies work well. Table 1-1 only reflects common choices.

Table 1-1. Popular Choices for Common Wireless Verticals

Vertical

802.11a

802.11b/g

802.11n

Manufacturing

 

X

X

Warehousing

 

X

X

Retail

 

X

X

Transportation

 

X

X

Financial institution

 

X

X

Hospitality

 

X

X

Healthcare

X

X

X

Enterprise office

X

X

X

Higher education

X

X

X

Use this section as a guideline to help your client determine the coverage required.

Manufacturing

Wireless coverage is used to help optimize the production cycle. The environment and machinery typical of this type of environment present several constraints:

  • Multipath: Metallic I-beam, conveyor belts, chain-link fences, metallic shelves, or the goods themselves might be important sources of radio frequency (RF) reflection.
  • Moving objects: APs and antennas must be out of reach from moving devices such as forklifts that might accidentally knock them down while moving goods.
  • Interferences: Electric engines in machinery can be a source of conflicting RF signal that might impact the industrial, scientific, and medical (ISM) band.
  • Mounting: Manufacturing environments often use high-ceiling facilities with metallic walls. Mounting APs may be difficult on the walls (where power may not be possible) or on the ceiling (sometimes too high to provide good coverage for devices on the ground using basic antennas).

Cell overlap typically needs to be 10 percent to 15 percent to overcome RF issues. Also, make sure that your customer understands how wireless will be used. Do you need to cover spot areas, or roaming paths? Are these paths changing over time? What throughput and latency are needed?