30 março 2009

Novo roteador permite mais velocidade

Os roteadores e a maioria dos equipamentos wireless, atualmente, usam a especificação 802.11. Esse padrão foi adotado em 1999 por um consórcio de empresas para facilitar a compatibilidade.

A organização adotou o nome Wi-Fi, que acabou virando um sinônimo para redes sem fios.

Um sistema de letras identifica os avanços tecnológicos no Wi-Fi. O B, primeiro a se popularizar, tem velocidade de 11 Mbps, com 30 metros de alcance em média.

O padrão G, mais utilizado atualmente, tem velocidade de 54 Mbps (valor que dobra para 108 Mbps no caso do super G) e alcance médio de 150 metros.

O padrão mais avançado é o N, lançado em 2007. A velocidade passa para 300 Mbps. Em alguns roteadores o sinal chega até os 500 metros.

Os padrões mais avançados são compatíveis com os anteriores, mas não basta trocar o roteador: o aparelho que vai acessar a rede sem fio deve ser compatível com o padrão N para que ele usufrua de toda a capacidade.

A velocidade extra, porém, é praticamente irrelevante quando se trata da conexão com a internet, já que os planos residenciais geralmente não passam dos 12 Mbps.

Optar por roteadores de padrão N, portanto, vale mais a pena se o problema for mesmo a distância do sinal.

Também é válido se o objetivo for aumentar a velocidade da rede sem fio para melhorar a troca de dados entre computadores ou transmitir conteúdo do computador para uma TV, por exemplo.

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