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networking:wireless_topic:wi-fi_standards:wi-fi_4-8 [2026/02/03 13:56] – [SNR — Signal-to-Noise Ratio] apereznetworking:wireless_topic:wi-fi_standards:wi-fi_4-8 [2026/03/25 03:00] (current) aperez
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 SNR = 20 dB → Fair link quality SNR = 20 dB → Fair link quality
  
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-**Antonio Perez   /  Network Engineer  / Saint Francis School **  
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 {{ :networking:wireless_topic:unlicensed-spectrum-and-channel-allocations_6-ghz.png?1000 |}} {{ :networking:wireless_topic:unlicensed-spectrum-and-channel-allocations_6-ghz.png?1000 |}}
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 +{{ :networking:wireless_topic:wi-fi_standards:the-5.9ghz-portion-of-5ghz-wi-fi-6-band.jpg?600 |}}
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 +**La paradoja de alta densidad:**
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 +  Con 40/80 MHz tienes canales más anchos pero solo 9 canales disponibles → 8.7 APs compitiendo por el mismo espacio de radio → contención masiva → los APs pasan más tiempo esperando turno que transmitiendo → throughput real de 12 Mbps.
 +  Con 20 MHz tienes canales más angostos pero 25 canales disponibles → 3.1 APs por canal → mucho menos contención →    cada AP transmite libremente → throughput real sube a 40-60 Mbps.
 +   La tasa PHY (lo que negocia la NIC) baja de 300 Mbps a 144 Mbps — eso es lo que ves en la asociación. Pero la   tasa real que llega al usuario sube, porque el canal está disponible para transmitir en lugar de estar bloqueado    por interferencia co-canal.
 +  La analogía simple: prefiero una autopista de 2 carriles sin tráfico que una de 4 carriles con 9 carros por carril frenando constantemente.
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 **The Industrial, Scientific, and Medical (ISM)** frequency bands are designated radio frequency bands as defined by the ITU Radio Regulations. These frequency bands were set aside for RF use for purposes other than telecommunications. **The Industrial, Scientific, and Medical (ISM)** frequency bands are designated radio frequency bands as defined by the ITU Radio Regulations. These frequency bands were set aside for RF use for purposes other than telecommunications.
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 +**{{ :networking:wireless_topic:wi-fi_standards:the-history-and-future-of-wi-fi_po_en_3609-6206-82_v0300.pdf |The-history-and-future-of-wi-fi}}**
  
 +{{pdfjs 46em >:networking:wireless_topic:wi-fi_standards:the-history-and-future-of-wi-fi_po_en_3609-6206-82_v0300.pdf}}
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networking/wireless_topic/wi-fi_standards/wi-fi_4-8.1770127014.txt.gz · Last modified: by aperez

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