October 2012
Intermediate to advanced
160 pages
2h 49m
Chinese
Content preview from 802.11n技術手冊
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第七章
是什麼在你的網路上 ?
本書的不少讀者可能喜歡網路技術，很單純地只是喜歡網路技術的利益，而且速度是它
本身的獎勵。不過對於大部分的電腦使用者，使用網路是完成工作的一種方式，因此網
路必須支援各類型設備以驅動設計。在整本書的設計部分，我將假設你已經決定投入
802.11n。不過你可能早已經做出決定了，因為就算你的 802.11a/g 網路已經全速運行，
使用者仍然會抱怨速度太慢了，也或許你可以改藉由 802.11n 設備增加範圍。或許它可
能就像是將價格曲線拉平一樣的簡單。當 802.11n 的 AP 首次推出，它們的售價明顯地
高於 802.11a/g 的設計產品，而至今你已經很難發現只支援 802.11a/g 的企業級設備，本
書假設你已經決定將 802.11n 做為你的核心技術，其可能是基於以下幾點原因：
峰值速度（Peak speed）/ 傳輸量（Throughput）
許多應用需要能夠提供最高速度的前提條件，醫院是最早採用 802.11 無線區域網路
技術的單位，因為病人們需要這些醫療技術無時無刻圍繞著他們，而且無線的連結
性可以賦予圖像藉由電子路由傳輸的能力。我與一所最早使用 802.11a 於放射醫療
車的醫院合作過，其好處是一些詳細的 X 光圖像在放射師與急診室之間的轉移可以
有很高的資料速率。許多需大量資料傳輸的應用轉移到 802.11n 將會有更大的優勢，
各種影像的應用更顯得合適，在資料傳輸方面也不需限定，以檔案為基礎（file-
based）的傳輸方式才能受惠於 802.1 ...
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