By Ray Horak
This ebook will offer a accomplished survey of telecommunications applied sciences and providers, at a cheap point of technical intensity, and within the author's detailed plain-English, common sense type. contemporary advancements in know-how to be explored will comprise: energy Line provider (PLC) extensive over energy Line (BPL) Passive Optical community (PON) 802.11g a number of enter a number of Output (MIMO) 802.16 & WiMAX This paintings will extend at the dialogue of a couple of different know-how subject matters that experience develop into matters of larger curiosity within the final 3 or 4 years because the book of Communications platforms and Networks, third version and competing works: Fiber Optics garage zone Networks (SANs) electronic Subscriber Line (DSL) CATV Networks instant Bluetooth mobile 2.5G & 3G photographs Video Ring Tones & Ring-Back Tones Voice over web Protocol (VoIP) IP PBX IP Centrex consultation Initiation Protocol (SIP) vs. H.323 law & Convergence Divestiture and Revestiture, Mergers and Acquisitions (M&A)
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Example text
Wired networks no longer are just supplemented by wireless network technologies but in many applications are now being challenged by them, especially where portability and mobility are advantageous. In fact, there now are more cellular phones in the world than there are wireline phones, and a great many people now use cellular phones as their primary and even sole telephone. Government regulation of monopolies has yielded to free market competition, a trend that began in 1984 with the Modified Final Judgment (MFJ) in the United States.
Some form of electromagnetic energy is employed to represent the data, usually through a physical medium, such as a copper wire or a glass fiber. A wireless medium, such as radio or infrared light, also may be employed. Additionally, a number of intermediate devices are typically involved in setting up a path for the information transfer and for maintaining adequate signal strength. The information transfer must be established and maintained at acceptable levels in terms of certain key criteria such as speed of connection, speed of information transfer, speed of response, freedom from error, and, finally, cost.
Traditionally, such a circuit was provisioned through the use of two copper pairs, one for transmission ( forward path, or upstream path) and 10 FUNDAMENTALS OF THE TECHNOLOGY: CONCEPTS AND DEFINITIONS one for reception (reverse path, or downstream path); such a circuit is known as physical four-wire. However, current technology accommodates four-wire transmission over a single physical link or path and over a variety of transmission media, including twisted-pair, coaxial cable, or fiber-optic cable.
