Selecção de canal WiFi de 2,4 GHz quando todos os canais não sobrepostos estão cheios

Question

Para Wi-Fi de 2,4 GHz, se os canais 1-6-11 não sobrepostos estiverem totalmente lotados por vizinhos, devo selecionar os outros canais sobrepostos (2,3,4,7 etc.) ou mesmo selecionar o menos lotado de 1-6-11?

Observação: não tenho opção de atualizar para 5GHz por enquanto.

    

Answer 1

Sugere-se que selecione o menos lotado entre 1-6-11 Fonte (Aqui )
Se você for com qualquer outra coisa, poderá reduzir seriamente a largura de banda geral.

O seu roteador sem fio não tem essa opção de seleção automática de canais?

(Resumo do link fornecido)

Test Results

Cisco performed tests to see the interference in a four-channel environment. The tests were conducted with four Cisco Aironet 1200 access points and four Cisco Aironet 350 clients, all running 802.11b at 11 Mbps. To help simulate the physical separation between devices, the access points and clients were set at 5-mW transmit power and spaced about 10 feet apart.

The throughput was measured by the average of all four clients simultaneously passing a 50-MB file five times. In all combined tests there was one client to each of the four access points. In the stand-alone test for benchmark comparisons, all four access points and all four clients were on. However, only one client was in the process of sending a 50-MB file using FTP.

Testing included two different scenarios:

1. Four North American access points, two using channel 1, the third using channel 6, and the fourth using channel 11

Note In this model, the first two access points had to share the RF because they were on the same channel.

2. Four North American access points using channels 1, 4, 8, and 11

Table 1 displays the results of the two tests. Note that even when two access points shared channel 1, the overall performance was greater than in the four-channel scenario. This is because the CSMA protocol created a holdoff when the clients on the same channel decoded that the interference was another 802.11 signal. In the four-channel scenario, the client could not decode the interfering signal, reacted as if it was low-level noise rather than a holdoff, and sent the packet. This resulted in a collision and a retransmission on both clients.

Table 1 Result Summary Showing Average Throughput per Client

Channels / Throughput (KB)
1, 1, 6, and 11 / 601.1
1, 4, 8, and 11 / 348.9

Conclusion

Many have long recommended a three-channel approach to provide nonoverlapping channels. We still recommend such installations for 2.4-GHz WLANs, for both 802.11b and 802.11g technologies. A four-channel scheme can cause severe issues when the system is brought online and the number of users starts to increase.

In a four-channel design, the signal of one device is noise to another device. Even in a design where a channel 1 cell would never overlap a channel 4 cell, for example, you must still account for clients transmitting that are not in the same location as the access point. By looking at only the access points, you are ignoring the majority of radios in your network. Virtually all new radio deployments support 802.11g and/or 802.11a and thus OFDM, which has much more sideband energy than 802.11b.

If you design a system with four channels, the risk of interference between cells greatly increases, resulting in poor performance and lower throughput. As the volume of users and bandwidth needs increase, problems will slowly arise, making it necessary to resolve the issue at a later date. Start by using three nonoverlapping, noninterfering channels.

    

Answer 2

Os canais Wi-Fi lotados nunca são uma coisa boa.

Se você tem 2,4 Ghz e não tem opção de atualizar para 5 Ghz, é melhor configurar seu canal para um que tenha menos sobreposição. Você pode fazer isso na interface do seu roteador.

Usando um aplicativo chamado analisador Wifi, você pode ver quais canais estão sobrepostos no momento.

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Definir a opção para Auto fará um bom trabalho. Ele alternará automaticamente para canais diferentes e, às vezes, pode entrar em um canal lotado. Acho melhor poder verificar canais e alterá-los de vez em quando Se tiver problemas com o Wi-Fi.

p.s se você tiver adaptadores wi-fi externos, alguns deles talvez não consigam entrar em contato com você em outro canal. e.x meu adaptador não viu minha rede quando estava no canal 11 ou superior. É apenas algo para manter em mente.