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UCSF RF Design Standards

Frank Guerra's picture

BACKGROUND

This section is intended to define the current RF design standard for UCSF.

 

I. Operating Frequencies (RF channels)

Wireless infrastructure is configured as dual band environment. 2.4 GHz and 5 GHz band. The standard configuration is to have all APs broadcasting in both channels simultaneously.

  1. 2.4 GHz band
  • Use only none overlapping channels are used
  • Valid channels are 1, 6 and 11
  • No 40 MHz channels
  1. 5 GHz band
  • Use only none dynamic frequency selection (none DFS) channels
  • Valid channels are 36, 40, 44, 48, 149, 153, 157, 161 and 165
  • Valid 40MHz channels pair
    • 36 – 40
    • 44 – 48
    • 149 – 153
    • 157 – 161
  • Although channel 165 is configured in the controllers, it will never be assigned to any APs due to no valid 40 MHz channel.
  • No 80 MHz channels
  1. Channel Management
  • No manual channel assignments should be done unless there are specific requirements
  • All channel assignment for APs are to be done by the controllers using technology of automatically managing RF spectrum.
  • Aruba Adaptive Radio Management (ARM) should be enabled to automatically assign channels for APs
  •  

II. RF coverage and RF redundancy

  1. RF Coverage
  • All deployments should be voice grade wireless network
  • Standard measurement should be based on AirMagnet or Ekahau survey tools
  • Cells coverage to support a minimum data rate of 11 Mbps
  • RF signal should be minimum of -65 dBm
  • Signal-to-noise ratio (SNR) should be minimum of 25 dBm
  • A minimum of 20% overlap of adjacent cell coverage, where coverage is provided

III. For RF redundancy

  • RF redundancy is required for 5 GHz band and not required for 2.4 GHz band
  • At least 2 RF signals that are better than -65 dBm should be heard from any points within the coverage area.
  • The redundant signals should be from different access points on different channels
  • If an area might only requires one AP for coverage, it is recommended to install two APs on none-overlapping channels for redundancy and load balancing
  1. RF Channel Contention
  • Signals of same channel should maintain 19 dBm separation

IV. Access point standard

  • For new installs or refresh, standard access point model is
    • Aruba AP-225 for indoor
    • Aruba AP-224 for outdoor or wherever directional antenna is required.
  • For existing location, Aruba AP-105 and AP-135 still be supported.
  • For buildings with Voice over WIFI and applications that required roaming, all access points are to be the same AP model for entire building
  • Others building, all access points within the same floor or coverage area are to be the same AP model

CAMPUS WIRELESS REFRESH MAIN PAGE