By K.V. Prasad
Ideas of electronic verbal exchange platforms & desktop Networks is designed as a textbook for classes on electronic verbal exchange structures, facts verbal exchange, laptop networks, and cellular computing. half I offers with key subject matters equivalent to info conception, transmission media, coding, mistakes correction, multiplexing, a number of entry, service modulation, PSTN, and radio verbal exchange. half II is going directly to hide the networking recommendations, the ISO/OSI protocol structure, Ethernet LAN, X.25 protocol, and TCP/IP protocol. ultimately, half III covers cellular computing, together with radio paging, mobile cellular, GPS, CTI, unified messaging, and multimedia verbal exchange. beneficial summaries, lists of supplementary info, references, and workouts on the finish of every bankruptcy make the e-book a finished source for a person pursuing a occupation in telecommunications and information verbal exchange.
· presents accomplished insurance of electronic communique, info communique protocols, and cellular computing · Covers electronic communications platforms, info verbal exchange protocols, laptop networking, cellular computing, and convergence applied sciences, together with PSTN, RS232, Signaling procedure No. 7, ISDN, body Relay, WAP, 3G Networks, and Radio Paging · encompasses a word list of vital phrases, a dictionary of universal acronyms, in addition to references, evaluate questions, workouts, and initiatives for every bankruptcy · "In short" and "Notes" sections offer convenient, at-a-glance info · contains diagrams and different visible aids to enhance textual descriptions and analyses
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1 Radio Spectrum Electrical communication is achieved by using electromagnetic waves, that is, oscillations of electric and magnetic fields in free space. The electromagnetic waves have two main parts: radio waves and light waves. Distinguishing between radio waves and light waves reflects the technology used to detect them. The radio waves are measured in frequency (Hz), and the other types of waves in terms of wavelength (meters) or energy (electron volts). The electromagnetic spectrum consists of the following: Radio waves : 300GHz and lower (frequency) Sub-millimeter waves : 100 micrometers to 1 millimeter (wavelength) Infrared : 780 nanometers to 100 micrometers (wavelength) Visible light : 380 nanometers to 780 nanometers (wavelength) Ultraviolet : 10 nanometers to 380 nanometers (wavelength) X-ray : 120eV to 120keV (energy) Gamma rays : 120 keV and up (energy) The radio spectrum spans from 3kHz to 300GHz.
This is a very high data rate, and this coding technique is not suitable for digital transmission of video. A number of video coding techniques have been proposed to reduce the data rate.
This digital signal representation for various types of information is the topic of this chapter. 1 TEXT MESSAGES Text messages are generally represented in ASCII (American Standard Code for Information Interchange), in which a 7-bit code is used to represent each character. Another code form called EBCDIC (Extended Binary Coded Decimal Interchange Code) is also used. To transmit text messages, first the text is converted into one of these formats, and then the bit stream is converted into an electrical signal.