evanescent
发表于 2025-3-23 12:32:31
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混合
发表于 2025-3-23 15:56:40
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bromide
发表于 2025-3-23 18:41:28
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exquisite
发表于 2025-3-23 23:48:51
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小教堂
发表于 2025-3-24 04:58:35
Introduction,This text is concerned with the way computer-based information is transferred over long distances, and with the organisation of the communication system to meet various needs.
GRIN
发表于 2025-3-24 09:14:46
Transmission in Wires,The point at which computer communications and electronic data transmission overlap is in the transmission of data in wires. Virtually all computer communications involve the use of wire. The few exceptions are very high speed transfers using waveguides, optical fibres and radio frequencies.
执
发表于 2025-3-24 11:01:30
The Telephone Network as a Medium,The previous chapter made the distinction between the medium used to carry information and a channel, which is a logical path from sender to receiver through which the information is passed. A channel is implemented in one or more media. Probably the most important communications medium for computer communications is the telephone system.
罐里有戒指
发表于 2025-3-24 17:26:16
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Gossamer
发表于 2025-3-24 20:22:40
Character Terminal Networks, The primary motivation for grouping the bits into characters rather than say computer words, was the early need to communicate between character-oriented devices (such as teletypes, displays and printers) and the computer. The growth of interactive computing has led to the widespread use of network
共栖
发表于 2025-3-25 02:09:59
Simple Message-based Techniques,his chapter require more intelligent terminals that are capable of more complex communication, but still involve the use of a central computer system. There are two main types of device used on message-based networks: these are page mode VDUs and remote job entry stations. At the end of the chapter