Wireless Design Principles

 

 

 

  • Wireless Signal Mesured in dBm ( Power referenced against one Milliwatt )
  • Range is roughly -30dBm to -90dBm
    • -30dBm = Max Achievable ( not desired ).
    • -67dBm = Mininum for real-time Apps.
    • -80dBm = Minimum for communication.
  • Noise is always a challenge
  • Signal to Noise Ratio ( SNR ) = ( SignalNoise ) = Value
    • Mininum SNR of 25 is needed for real-time apps.

Wireless Channel Selection: 2.4Ghz and 5Ghz

  • 15% – 20% overlap required for seamless roaming.
  • -67dBm at cell edges for real-time traffic.
  • Multi-floor should be a 3D design.
  • 2.4Ghz means fewer clean channels (1 – 11).
  • 5Ghz means less range.

Site Survey tips:

  • Identify the “Customer Style” you’re dealing with.
  • Determine coverage area and key locations ( Good and bad ).
  • Do a “floorplan-based WAP map”- Preliminary design.
  • Install Waps.
  • Do a “Boots on the ground” site survey, floorplan in-hand.
  • Make adjustments ( Move WAPs, add Maps) to achieve data rates.
  • Document everything you’ve done.

Add a Comment

Your email address will not be published.


CAPTCHA Image
Reload Image