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                                                                                                                                                                                                              文章詳情

                                                                                                                                                                                                              速率和寬帶是什么,應該如何區分

                                                                                                                                                                                                              日期:2022-07-25 21:20
                                                                                                                                                                                                              瀏覽次數:62
                                                                                                                                                                                                              摘要:但是網絡接口的設計者已經能夠開發編碼方案,如脈沖幅度調制(PAM)和DSQ128,


                                                                                                                                                                                                              說到銅纜,你可能聽說過6類的帶寬是250MHz,6類的帶寬是500MHz(帶寬通常打印在電纜護套上。)這造成了大量的混亂,因為我們認為網絡上的帶寬是以Mb/s或Gb/s表示的。我們的想法并沒有錯——您的6A類電纜的工作帶寬可能為500 MHz,而您的網絡的帶寬可能為10 Gb/s。

                                                                                                                                                                                                              那么,有同學會問為什么類別電纜帶寬定義為Mhz?這是個好問題。兆赫是波每秒循環的頻率或速率,1赫茲等于每秒1個循環,1兆赫等于每秒100萬個循環。速度與頻率的關系有點復雜,但簡單來說,需要更高的頻率來承載更多的數據位每個數據位在載波頻率上被編碼,并且每秒可以發送的數據量取決于有源設備的信號編碼方案。

                                                                                                                                                                                                              早在第5類的時代,帶寬和數據速率是一樣的——100兆赫的電纜可以傳輸100兆字節/秒。但是網絡接口的設計者已經能夠開發編碼方案,如脈沖幅度調制(PAM)和DSQ128,以超越帶寬與數據速率的簡單1:1關系,到Cat 6問世時,他們已經能夠通過一根帶寬為250mhz的電纜驅動10gbps這種方法是NBASE-T如何能夠從5e類電纜中獲得2.5甚至5 Gbps,以及您的電纜供應商如何在不重新布線的情況下,為您提供更快的網速。

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