計算機專業(yè)英語的課文與翻譯(已修改)
2025-04-16 01:50 本頁面
【正文】 Unit 8 Computer NetworkingText 1 Data CommunicationsThe end equipment can be puters, printers, keyboards, CRTs, and so on. They are either generates the digital information for transmission or uses the received digital data. This equipment generally operates digital information internally in word units.DTE is data terminal equipment. A station controller (STACO) is the corresponding unit at the secondaries. At one time, the DTE was the last piece of equipment that belonged to the subscriber in a data link system. Between the DTEs, first is the modem, and then is the munications equipment. The munication equipment is owned and maintained by Telco. Data munications equipment (DCE) accepts the serial data stream from the DTE. And DCE converts it to some form of analog signal suitable for transmission on voicegrade lines. At the receive end, the DCE performs the reverse function. It converts the received analog signal to a serial digital data stream. The simplest form of DCE is a modem (modulator/demodulator) or data set. At the transmit end, the modem can be considered a form of digitaltoanalog converter. While at the receive end, it can be considered a form of analogtodigital converter.參考譯文數(shù)據(jù)通信終端設備可以是計算機、打印機、鍵盤、CRT等。它們可以生成要發(fā)送的數(shù)字信息，也可以使用所接收的數(shù)字數(shù)據(jù)。這種設備通常在內(nèi)部以字為單位處理數(shù)字信息。DTE一般稱為數(shù)據(jù)終端設備。輔助設備一方的相應設備是工作站控制器（STACO）。同時，DTE也是數(shù)據(jù)鏈路系統(tǒng)中屬于用戶端的最后一個設備。在兩個DTE之間，先是調(diào)制解調(diào)器，接著是屬于Telco電話公司維護的通信設備。數(shù)據(jù)通信設備（DCE）從DTE接收串行數(shù)據(jù)流，并將其轉換成適合于在語音線路上發(fā)送的某種模擬信號形式。在接收端，DCE完成相反的功能，把接收到的模擬信號轉換成串行數(shù)字數(shù)據(jù)流。最簡單的DCE是調(diào)制解調(diào)器或數(shù)據(jù)傳送機。在發(fā)送端，調(diào)制解調(diào)器可以視為一種數(shù)/模轉換器，而在接收端則可視為一種模／數(shù)轉換器。Text 2 Architecture of Computer Networks Computer network is a plex unit, it consists of two or more connected puting units. It is used for the purpose of data munication and resource sharing. Design of a network and its logical structure should ply with a set of design principles. They include: the organization of functions, the description of data formats and procedure. In the following two sections we will discuss two important network architectures, the OSI reference model and the TCP/IP reference model.(1) the OSI reference model The OSI (open systems interconnection) model was created by the ISO. This model is a foundation for paring protocols。 However, more protocols deviate from the rules set up by the OSI model.The OSI model has seven layers. Note that the OSI model itself is not a network architecture. It
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