October 2012
Intermediate to advanced
160 pages
2h 49m
Chinese
Content preview from 802.11n技術手冊
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第一章
度（Transmission Speed）的一半。在 802.11b 中，11 Mbps 的傳輸速度提供了 5 至 6
Mbps 的傳輸量。在 802.11a/g 中，54 Mbps 的傳輸速度則提供了 25 至 30 Mbps 的傳
輸量。802.11n 的目標就是為了增進協定的效率，使傳輸速度的增進不再為協定的負擔
（Overhead）所困。
802.11n 發展中的第一個主要里程碑是第二版草案（Draft）。雖然有些產品是依據
802.11n 草案 1.0 所生產，但互通性卻不是始終如一的。在解決第一版草案的 12,000 個
評論後，一個更強固的第二版草案在 2007 年初產生了。藉由移除許多不明確的部份，
草案 2.0 有了預期的高度互通性。在同一時期，Wi-Fi 聯盟（Wi-Fi Alliance）啟動了一
個認證計畫以驅動當時新興的 802.11n 標準的互通性。這個認證計畫相當的成功。在
2008 年夏季的會員大會中，圖 1-1 中的蛋糕是這個認證計畫成功的有形（並且是好吃
的）證據。
圖 1-1 802.11n 草案 2.0 的慶祝蛋糕
記得 802.11n 最終在 2009 年 9 月被批准時，我正在澳洲進行訪問，得知了這個預料中的
消息，就是 802.11n 已經被標準委員會所認可。作為一份 500 頁的規格書，在進入出版
程序前有許多的工作要進行。在我參與 802.11 工作小組所得到的紀念品中，圖 1-2 的滑
鼠墊是其中喜愛的紀念品之一。把它留在身邊，以提醒我把事情做對比把事情儘速處理 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.