¿Qué es una Wireless LAN?

Provee todas las características y beneficios de las tecnologías LAN tradicionales como Ethernet y Token Ring, pero sin las limitaciones de los cables.

Como las LAN, las redes Wireless (Inalámbricas) requieren un medio físico para transmitir las señales:

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En lugar de usar UTP, las redes Wireless usan:
  • Luz infraroja (IR).
    • 802.11 incluye una especificación IR.
    • Limitaciones, se bloquea fácilmente, no hay realmente productos 802.11 (IrDA).
  • Radio Frecuencias (RFs)
    • Puede penetrar la mayoría de obstrucciones de oficinas.
  • Las redes Wireless usan bandas de frecuencia de 2.4 GHz y 5 Ghz.
  • Bandas ISM (Industria, Scientific, Medical) sin licencia.
  • WLANs use the 2.4 GHz and 5-GHz frequency bands.
  • ISM (Industry, Scientific, Medical) license-free (unlicensed) frequency bands.
  • S-Band ISM
    • 802.11b and 802.11g:  2.4- 2.5 GHz
  • C-Band ISM
    • 802.11a:  5.725 – 5.875 GHz

802.11 y la alianza Wi-Fi

Funciones importantes de IEEE 802.11 Y WIFI alliance

  • Diseña especificaciones para WLAN de alto rendimiento.
  • Seguridad inalámbrica, interoperabilidad y calidad de servicio QoS.

Certificación WIFI alliance

  • Asegura la interoperabilidad a nivel de usuario: productos de los fabricantes.
  • La comprobación exitosa merece un “sello de aprobación”.