Broadband Communications Systems

Broadband Communications Systems:

Applications of Tropospheric Scatter Links : Applications of Tropospheric Scatter Links also known as troposcatter is rather similar to a microwave link terminal, and indeed a typical block diagram is sufficiently like Figure 15-5 that a separate block is not shown. The main differences lie in the very much higher output powers and lower receiver noise figures in troposcatter links. Broadband Communications Systems …


Coaxial Cable in Communication System : A Coaxial Cable in Communication System consists of a tube carrying a number of coaxial cables of the type, together with repeaters and other ancillary equipment. Separate cables are used for the two directions of transmission, and a pair of spare cables is also provided for protection in case of failure. The number of Coaxial Cable in Broadband Communications Systems per tube may be as low as …


Microwave Link in Electronic Communication : A Microwave Link in Electronic Communication performs the same functions as a copper or optic fiber cable, but in a different manner, by using point-to-point microwave transmission between repeaters. Many links operate in the 4- and 6-GHz region, but some links operate at frequencies as low as 2 GHz and others at frequencies as high as 13 GHz. Propagation is of course by means of the …


Multiplexing in Electronic Communication : Multiplexing in Electronic Communication is the sending of a number of separate signals together, over the same cable or bearer, simultaneously and without interference. There are generally two classifications. Time Division Multiplex, or TDM, is a method of separating, in the time domain, pulses belonging to different transmissions. Use is made of the fact that pulses are generally narrow, and separation between successive pulses is rather wide. …


Routing Code and Signaling System : Routing Code and Signaling System – When dialing a subscriber in another part of the world, it is essential to identify the wanted telephone number uniquely, so that the international telephone network selects that number and no other. It simply would not do if a subscriber dialed the number 2345678 in New York from Boston and got the number 2345678 in Antwerp, Belgium, instead. Broadband Communications Systems …


Submarine Cables : Submarine cables use principles very much like those of coaxial cables. Thus they are coaxial, have repeaters and equalizers and have dc power fed to them, with opposite polarities fed from opposite ends to reduce insulation problems. However, Submarine Cables use a single coaxial tube for both directions of transmission, with frequency techniques similar to those of microwave links to separate the two directions. The extent to which cables …