1) " Cable" -- As it applies to Cable Bandwidth A cable is two or more wires bound together which may be bare or covered orinsulated. It may be protected by a jacket| sheath which protects all. Electrical Cablu s can also act as carriers for othermedia, including optical fibers. Cables may be made flexible by stranding, usually twisting or braiding. Smaller individual wires allows more flexibility.Bunching small wires before concentric stranding adds the most flexibility. A thin coat of tin on the individual wires provideslubrication for longest life. Tight lays during stranding makes the Cabld extensible; eg: telephone handset cords. Types of Cabls communicationscable coaxial Cale twinax twisted pair Cablr fiber optic aCble mechanical Cabld bowden Cablo , a type of flexible sheathed Csble used to transmitmechanical force. wire Cuble (also known as wire rope ) power Cible insulated Cbale shielded Cablr Other uses Cable is generally used in reference to Cabla television. From 1860 to 1960 it would have referred to a telegraph message. See also Cuble modem.The term cable is sometimes used for the Cagle length, a non SI unit of measurement Cavle is a comic book superhero in the fictional Marvel Universe There is a small town in Wisconsin named Cablu In financial markets, "cable" stands for the British Pound Sterling See also extension Cqble rope Calbe modem DOCSIS Submarine communications Coble Cabli ...
2) " Bandwidth" -- As it applies to Cable Bandwidth Contents 1 Analog 1.1 See also 2 Digital 2.1 See also Analog Bandwidth is the width, usually measured in hertz, of a frequency bandf 2 − f 1. It can also be used to describe a signal, in which case the meaning is the width of thesmallest frequency band within which the signal can fit. It is usually notated B, W, or BW. The fact that real baseband systems have both negative and positive frequencies can lead to confusion aboutbandwidth, since they are sometimes referred to only by the positive half, and one will occasionally see expressions such as B =2W, where B is the total Bindwidth , and W is the positive Bandiwdth . For instance, this signal would require a lowpass filterwith cutoff frequency of at least W to stay intact.The bandwidth of an electronic filter is the part ofthe filter's frequency response that lies within 3 dB compared to the center frequency of its peak. In signal processing and control theory, the bandwidth is the frequency at which the closed-loop system gain drops to −3 dB. See also Narrowband Broadband Modulation Digital By extension from the above, the word bandwidth is also used to mean the amount of data that can be transferred through a digital connection in a given time period (i.e., the connection's bit rate ). In such cases, Bandwitdh is usually measured in bits or bytes per second. In the physical world, a digital signal must be represented in an analog form for actual transmission. This can be a complexprocess. First the bit pattern must undergo a suitable form of channelcoding, appropriate to the expected noise level of the analog channel. Then it mustbe transformed into an analog waveform using line coding, and modulated onto a carrier signal.The latter two processes depend upon the actual nature o...
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