TAILIEUCHUNG - Programmable Logic Controller plant through MMI Part 11

Tham khảo tài liệu 'programmable logic controller plant through mmi part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | New Applications Using PLCs in Access Networks 123 band. Next is the noise that appears on the other pair but at the same end of the cable as the source of interference Cook et al. 1999 as shown in Fig. 1. Crosstalk transmitter Near-End Cable receiver Fig. 1. Illustration of Next Fext is the noise that appears on another pair but at the opposite or far end of the cable to the source of noise Cook et al. 1999 . Fext is less harmful than Next since it is mitigated because the distance between the source and the noise receiver. Fig. 2 is an example of Fext. Crosstalk transmitter Cable Pair 1 Pair 2 Far-End Receiver Fig. 2. Illustration of Fext Techniques such as DSM dynamic spectrum management and MIMO multiple-input multiple-output schemes try to find a controlled injection of spectrum in DSL systems so that the resulting crosstalk can assume acceptable performance values Starr et al. 2003 Odling et al. 2009 . Wireless Broadband Networks WBN A large number of wireless technologies exist and other systems still being under design. These technologies can be distributed over different network families based on a system scale Nuaymi 2007 A wireless personal area network WPAN is a data network used for communication among data devices close to one person A wireless local area network WLAN is a data network used for communication among data devices computer telephones printer and personal digital assistants PDAs . This network covers a relatively small area like a home an office or a small campus or part of a campus 124 Programmable Logic Controller A wireless metropolitan area network WMAN is a data network that may cover up to several kilometres typically a large campus or a city A wireless wide area network WWAN is a data network covering a wide geographical area as big as the Planet. WWANs are based on the connection of WLANs allowing users in one location to communicate with users in other locations. There are many applications for wireless networks. One of the .

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