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              深圳市金維通訊技術有限公司
              電話交換機程控電話交換機威譜電話交換機國威電話交換機...網點分布:深圳 廣州 中山 佛山 珠海 惠州

              什么叫交換器?它有哪些分類?


              交換器又稱為交換機(英文:Switch,意為“開關”)是一種用于電信號轉發的網絡設備。它可以為接入設備的任意兩個網絡節點提供獨享的電信號通路,交換器其實就是一種交換式的集線器。交換器與集線器(HUB)在網路內的功用大致相同,其間最大的差異在于交換器的每個埠(port)都享有一個專屬的頻寬并具備資料交換功能,使得網路傳輸效能得於同一時間內所能傳輸的資料量較大;而集線器為則是所有的埠(port)共享一個頻寬。


              交換機按用途一般分為以太網交換機,電話語音交換機、光交換機等。
              電話程控交換機

                  交換機的起初是人工交換。當電話被發明后,只需要一根足夠長的導線,加上末端的兩臺電話,就可以使相距很遠的兩個人進行語音交談。
                        電話增多后,要使每個擁有電話的人都能相互通信,我們不可能每兩臺電話機之間有拉上一根線。于是人們設立了電話局,每個電話用戶都接一根線到電話局的一個大電路板上。當A希望和B通話時,就請求電話局的接線員接通B的電話。接線員用一根導線,一頭插在A接到電路板上的孔,另一頭插到B的孔,這就是“接續”,相當于臨時給A和B拉了一條電話線,這時雙方就可以通話了。當通話完畢后,接線員將電線拆下,這就是“拆線”。整個過程就是“人工交換”,它實際上就是一個“合上開關”和“斷開開關”的過程。因此,把“交換”譯為“開關”從技術上講更容易讓人理解。

                人工交換的效率太低,不能滿足大規模部署電話的需要。隨著半導體技術的發展和開關電路技術的成熟,人們發現可以利用電子技術替代人工交換。電話終端用戶只要向電子設備發送一串電信號,電子設備就可以根據預先設定的程序,將請求方和被請求方的電路接通,并且獨占此電路,不會與第三方共享(當然,由于設計缺陷的緣故,可能會出現多人共享電路的情況,也就是俗稱的“串線”)。這種交換方式被稱為“程控交換”。而這種設備也就是程控交換機”又被稱為“語音交換機”。
                 由于程控交換的技術長期被發達國家壟斷,設備昂貴,我國的電話普及率一直不高。隨著當年華為、中興通訊等企業陸續自主研制出程控交換機,電話在我國得到迅速地普及。
                 目前,語音程控交換機普遍使用的通信協議為七號信令(Signalling System No.7)

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