Luciano Chersanaz Ubnet Datacenter MikroTik User Meeting...
Transcript of Luciano Chersanaz Ubnet Datacenter MikroTik User Meeting...
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Luciano ChersanazUbnet Datacenter
Santa Cruz, ArgentinaMikroTik User Meeting – PERU 2012
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Temario:Ejemplo de diseño e implementación de una
estación base:
*análisis del estandar 802.11n
*modulación y código de esquema
*transmisión TDMA NV2
*ajuste, optimización, mejora ;
-criterios físicos sobre el sistema radiante
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802.11n Aprobado por la IEEE el 11 de septiembre de 2009
“Busca mejorar velocidades de transmisión, fiabilidad de comunicación, basándose en la mejora de modulación, codificación y
el procesado de señal”
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802.11nEficiencia Espectral: Capacidad de Shannon
C = B log2 (1 + S/N)
B es el ancho de banda del canal,
C es la capacidad del canal (tasa de bits de información bit/s)
S es la potencia de la señal útil (W, mW, etc.)
N es la potencia del ruido presente en el canal, (mW, μW, etc.) que trata de enmascarar a la señal útil.
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802.11nMejoras sustanciales :
Modulación : OFDM mejorado
MIMO : señales multiruta, multiplexado de división espacial (SDM) , diversidad por array.
Agregación de tramas
Canales en 40MHz
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802.11nOFDM : 1. Mejora en Ortogonalidad (secuencia Gold / Walsh más eficiente)
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802.11nOFDM :
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802.11nMIMO:
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802.11nMIMO:
1- SDM (Multiplexado por Division Espacial)
*multiruta
*subcanal independiente
*multiples receptores
* antena discreta según nro. cadenas
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802.11nMIMO:
2- SD: (Diversidad Espacial)
*comparte portadora
*mismo subcanal
*frames duplicados
USO: streaming, VoIP.
Throughput < Tolerancia fading / difracción, refracción
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802.11nAGREGACION DE TRAMAS
1. Mejora en capa MAC
2. Menor transmisión de encabezados
3. Reduce espacio entre tramas
Mayor EFICIENCIA DE TIEMPO DE AIRE!
“Airtime efficiency”
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802.11n 40MHz - MODO PCO (Phased Co-existence Operation)
La operación de coexistencia de fase, alterna dinámicamente, entre 40 y 20Mhz, según necesidad de Throughput, o inclusión de estaciones 802.11abg
REALMENTE NO ES UNA MEJORA!!!
“uso indebido genera gran gasto de espectro”
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MCS: Modulación y Código de Esquema
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TDMA – distribución por time-slot
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Conclusión:“El uso adecuado de la tecnología 802.11n en
combinación con Nv2, nos garantizará un airtime efficiency superior”
1. Mayor concurrencia de clientes simultaneos
2. Mayor Throughput
3. Menor Latencia ante gran ocupación del medio
4. Tolerancia a interferencias por Nodo Oculto
5. Menor degradación ante estaciones problemáticas
6. Adaptación a degradaciones del medio (RF)
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Pero … ¿Qué es adecuado?
Antes de saberlo… Pasemos a conocer a nuestro instalador estrella!!!
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¿Qué huésped del hotel se ve beneficiado con este tipo de
instalación?
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EJEMPLOS PARA NO IMITAR!!!
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EJEMPLOS PARA NO IMITAR!!!
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Optimizando nuestra infraestructura
1-Ecualización: Reducir potencia de emisión (Tx)
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Optimizando nuestra infraestructura
2-Alocación de canales: Estación Base o Micro-sectorizado
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3- Delimitación de área y cálculo de downtilt
Optimizando nuestra infraestructura
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Optimizando nuestra infraestructura
4- Configuración de banda y modo de operación
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Optimizando nuestra infraestructura
5- Elección de data rates / modulación / nro cadenas
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Optimizando nuestra infraestructura
5- Elección de data rates / modulación / nro cadenas
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Optimizando nuestra infraestructura
5- Elección de rata rates / modulación / nro cadenas
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Manos a la obra!
“Espero que la presentación halla sido de su agrado …Ahora es buen tiempo para poner en práctica
estos tips”
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