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    數據中心綜合布線要考慮哪些因素?

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    文章出處:唯康信息
    發表時間:2019-08-21
          如今,綜合布線已成為數據中心建設和運營日益重要的課題。那么在數據中心的綜合布線中我們需要考慮到哪些因素呢?需要注意哪些方面呢?今天就讓我們來看一下。
    1、線纜長度
           傳統的無源銅纜主要用于連接單個機架內的設備(機架內連接)。根據銅纜類型和應用情況,它們的距離通常限制在7-10米。
          相比之下,有源銅纜在每一端的連接器中安裝電子器件或光學器件,從而使有源銅纜能夠克服大多數的物理距離限制。
          在有源銅纜布線的情況下,在銅纜兩端的電子元件可以增強、均衡和處理進入銅纜的信號,另一端的電子元件則將它們恢復到原始水平,允許適合使用的電纜距離在機架內和機架之間(機架間)。
          在有源光纜中,連接器將電信號轉換為光信號,反之亦然,可以傳輸更長的距離,并提供數據中心配置更大的靈活性。
    2、線纜屬性
          在同等數據速率的情況下,光纜比銅纜更輕、更薄,不需要屏蔽。光纜通常重量較輕,體積較小,彎曲半徑更小。光纖的這些優勢提供了數據中心配置的更多靈活性。
    3、冷卻和氣流的考慮因素
          大量電纜的體積會對連接設備的冷卻效率、壽命,以及機架和數據中心設施的冷卻要求和功耗產生重大影響。在這方面,更加輕薄的光纜具有明顯的優勢。
    4、功耗
          與數據中心的處理器和其他組件或風扇和冷卻設施相比,線纜消耗的電力相對較少。但隨著這些系統越來越節能,人們對線纜能耗的關注度也越來越大。
          通常情況下,通過無源銅纜傳輸所消耗的能量和所需的功率與其長度直接相關。無論是銅纜還是光纜,在不考慮其長度的情況下,都有固定的功耗。最后,光纜在長距離傳輸方面有著眾所周知的優勢。
    5、電磁干擾(EMI)
          無論是無源銅纜還是有源銅纜的電磁輻射都高度依賴于制造商的質量標準,而銅質電纜的連接器和導體都會產生電磁干擾(EMI)。第三方無源銅纜的低成本通常很有吸引力,但它們的電磁干擾(EMI)特性可能難以預測。使用有源光纜時,電磁干擾(EMI)只能來自電纜末端連接器內的組件,因為光纜本身不會發出電磁輻射。
          一般來說,這些光學元件的設計和屏蔽要比銅纜的設計和屏蔽更加精細。因此,從電磁的角度來看,光纜往往更為優越。
    其他需要考慮的問題
    在制定數據中心布線決策時,人們可能需要了解以下一些其他注意事項:
    1、成本
           銅的價格可能會出現波動(見圖表),但隨著產量的增加和技術的不斷改進,光纖電纜的成本也正在下降。一些分析表明,當考慮部署、冷卻和能耗等壽命成本時,光纖解決方案更具成本效益。從長期來看,銅價正在上漲。
    2、板載與基于電纜的均衡
           在電纜內進行信號處理和均衡,而不是在連接的端口內進行具有一些優點。如前所述,不同長度的線纜可能具有不同的操作特性。因此,在線纜內執行這些功能有利于將連接的設備與距離相關的配置或性能問題進行隔離。
     
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