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2.4GHz vs 5GHz

いや、無線LANのことですが、今までその存在は知っていましたが、設定したことはありませんでした。

Time Capsule や Airmac Extream の無線LANは2.4GHz帯と5GHz帯の周波数両方に対応しており、また同時に使用することが可能です。

2.4GHz帯の方が壁などの障害物に強い一方で、5GHz帯の方が電子レンジやBluetoothなど近接する電波からの電波干渉を受けにくい特性があります。漠然と2.4GHz帯の方が通信範囲が広そうという理由で今まで2.4GHzで設定していましたが、5GH帯に変えてびっくり。

 Airmacユーティリティーのワイヤレスから設定します。ワイヤレスオプションの5GHzネットワーク名の前のチェックボックスにチェックを入れるだけです。

スクリーンショット 2012-03-30 10.41.34.png 

ファイルサーバへのRead/Writeのスピードを確認してみると、

2.4GHzで

スクリーンショット 2012-03-30 11.08.08.png

5GHzで

スクリーンショット 2012-03-30 11.08.16.png 

ちなみに、有線LAN(1G)だと256k blocksでRead/Writeともに80~90MB/sec程度なので、5GHzであれば1/10程度の低下に留まっています。

アクセスポイントからそれほど離れないのであれば、5GHz設定ですね。 

Apple AirMac Extremeベースステーション MB763J/A

Apple AirMac Extremeベースステーション MB763J/A

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