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802.11g #53

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# Modelo (Raspberry Pi 3 B)

- Classificação: placa
- Nome técnico: Raspberry Pi 3 B
- Ano de lançamento: 2016

É a terceira geração da linha de placas que foram um dispositivo compacto (em tamanho similiares a um cartão bancário) que entregam um mini PC de baixo custo, que pode ser utilizados para os mais variados projetos, despertando mais interesse nos desenvolvedores de softwares livres. O sistema Operacional fica instalado no cartão micro SD.

## Características:

### Arquitetura: ARM

### Conjunto de instruções: ARMv6

### CPU

- Clock: 1.2 GHz - Cortex-A53 64-bit - Broadcom BCM2837
- Cache: 32kB Level 1 and 512kB Level 2
- Núcleos: 4

### GPU

- Clock: 400 MHz
- Cache:
- Núcleos: 2

### Memória

- Tipo: DDR2
- Tamanho: 1 GB

### GPIO

- Quantidade: 40
- Tipos:

### Recursos

- Bluetooth: 4.2
- Rede: Ethernet 10/100 Mbit/s e WIFI 2,4 GHz/ 5 GHz IEEE 802.11 802.11 - BCM43438

## Fotos

![Raspeberry Pi 3B](imgs/raspberrypi3b_1.png)

![Raspeberry Pi 3B](imgs/raspberrypi3b_2.png)

![Raspeberry Pi 3B](imgs/raspberrypi3b_3.png)



## Referências

[1-WIKIPEDIA](https://pt.wikipedia.org/wiki/Raspberry_Pi)

[2-WIKIPEDIA](https://en.wikipedia.org/wiki/Raspberry_Pi_Foundation)

[3-RASPEBERRYPI.ORG](https://www.raspberrypi.org/products/raspberry-pi-3-model-b/)

[4-RASPEBERRYPI.ORG](https://www.raspberrypi.org/documentation/usage/gpio/)




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# Modelo (IR, NFC, TCP, Multicast, CoAP)

- Classificação: Protocolo
- Concepção: n/a
- Lançamento: 2003

Descrição: Uma evolução do padrão 802.11, usado para comunicação sem fio. O 802.11g trouxe aumento da velocidade utilizando a mesma banda, apresenta um hardware novo, onde a disposição dos bits na camada física proporcionaram esse aumento de velocidade. É compatível com anteriores.

## Características

### Tecnologia

- Alcance: 38 m em ambientes fechados / 140 m ao ar livre
- Velocidade: 54 MBit/s padrão de 2,4 GHz
- Protocolos: 802.11g

### Modulção

- OFDM
- Tecnologia BPSK

### Exemplo de uso

WiFI

![Canal](imgs/802-11g.png)
![Banda](imgs/802-11g_2.png)

## Referências

[File:2.4 GHz Wi-Fi channels (802.11g WLAN).svg](https://en.wikipedia.org/wiki/File:2.4_GHz_Wi-Fi_channels_(802.11g_WLAN).svg)
[IEEE 802.11g-2003](https://en.wikipedia.org/wiki/IEEE_802.11g-2003)
[Orthogonal frequency-division multiplexing](https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing)
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