TAILIEUCHUNG - MultiBooks - Tổng hợp IT - PC part 160

Tham khảo tài liệu 'multibooks - tổng hợp it - pc part 160', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Broadband transmission the data is modulates into a carrier wave. Broadband transmission has a much greater band width than baseband it can transmit sth like ten times as much in a given time LAN is one of the distributed processing designs - LAN are considered loosely coupled system processors are located in separate machines and communicate at relatively low speeds - LAN is the means by which distribution takes places regardless of what are distributed Chapter 10 DATA COMMUNICATIONS. Question 1. Write a short note of 1. Communication is an extensive subject in its own right encompassing not only data transmission but also sound and video transmission via telephone lines radio links and satellite links. 2. Multiplexing is a means of combining together data from several sources so that it can be transmitted along one comminication line 3. Front - end processing A front - end processor is usually a minicomputer or a microcomputer interposed between the main computer and the multiplexor Its purpose is to relieve the host computer from the bunden of communications housekeeping 4. Concentrators are device used to gather the bit from each terminal or group of terminal and hold them on buffer store unit until there are sufficient to justify forward transmission 5. Protocol is an agreement where by devices can communicate is a fully understand manner 6. Multidrop line multipoint line has several terminals on concentrator attached to it 7. Distributed data processing sys is one of which interconnected points at which processing power and storage capacity are availble Question 2. Fibre Optics Fibre optics is that data and other information is transmitted in the form of light through very fine glass fibres Ads - High bandwidth eg data transmission capacity - Low cross - talk eg interference between adjacent fibres - Low attenuation eg loss of signal strength - Freedom from interference from external electrical and electromagnetic equipment - High reliability - Safe because .

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