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Wireless Networking Types 無線網絡類型
In addition to Wi-Fi networks, there are other wireless options that exist, such as Bluetooth and infrared. These types of technologies are usually used for Personal Area Networks (PANs) in order to connect (or pair) two devices in an ad hoc manner.
除了Wi-Fi網絡外，還存在其他無線選項，例如藍牙和紅外線。這些類型的技術通常用於個人區域網（PAN），以便以臨時方式連接（或配對）兩個設備。
Bluetooth radio is used to connect many kinds of devices, including mice, keyboards, remotes, smartphones, tablets, printers, projectors, and many others. Just as USB replaced most cables between devices and the workstation, Bluetooth replaces most previous wireless technologies for personal area networks (like infrared). Bluetooth does not require direct line of sight between connected devices. Bluetooth is a low-speed, short-range networking technology that comes in three classes. Class 1, which is not common, can transmit up to 100 meters. Class 2, the most common Bluetooth in use today, can travel up to 10 meters. Class 3, a very short-range variant, only goes one meter. Bluetooth can operate at up to three Mbps, which in today’s modern computer networks is considered extremely slow.
藍牙無線電用於連接多種設備，包括鼠標，鍵盤，遙控器，智能手機，平板電腦，打印機，投影儀等。就像USB取代了設備與工作站之間的大多數電纜一樣，藍牙也取代了個人區域網（例如紅外線）中以前的大多數無線技術。藍牙不需要所連接設備之間的直接視線。藍牙是一種低速，短距離網絡技術，分為三類。不常見的1類可以傳輸100米。第2類，是當今使用的最常見的藍牙，可以傳輸10米。3級是一種非常短距離的變體，只能行駛一米。藍牙可以以高達3 Mbps的速度運行，這在當今的現代計算機網絡中被認為是非常慢的。
Infrared existed before Bluetooth and was a short-range, low-speed, line-of-sight communication path. It was heavily used to connect personal digital assistants (PDAs) and wireless mice and keyboards. Not common in contemporary computers, it was replaced almost entirely by Bluetooth, but some machines keep an integrated infrared sensor for backward compatibility. If you have a need for infrared, but it isn’t included on your machine, you can add an infrared sensor through a USB adapter.
紅外技術早於藍牙技術就已存在，它是一種短距離，低速，視線通信的路徑。它被大量用於連接個人數字助理（PDA）和無線鼠標和鍵盤。在當代計算機中並不常見，它幾乎已完全被藍牙取代，但某些機器保留了集成的紅外傳感器以實現向後兼容性。如果您需要紅外線，但您的機器中沒有紅外線，則可以通過USB適配器添加紅外線傳感器。
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