Telecommunications - 20/02/2007 23:38:00 Telecommunications...

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20/02/2007 23:38:00 Telecommunications     Definition o System in which data or info. Are sent over some type of  transmission medium Helps us get information from one area to another Sender a receiver and a communication medium Sender   (communication Medium)  Receiver o This is input   processing    output o Same idea Communicating with many Communication medium     anything that carries an electron signal and  interfaces between a sending and  receiving  device.  Computer = data Voice = telephone Medium = signal  Device = modem  This is the system it goes through The importance is the input output processing  Media types    
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Twisted pair wire cable (telephone) Coaxial cable (cable and telephone) Satellite  Fiber optics –(higher speed and smaller)  used now in new home developments – but  expensive Microwave transmission (no cable, high speed) Cellular transmission (mobile users) Infrared transmission (unobstructed line of sight, Move  and reinstalled) You need to know what your asking for  – need to understand what each does  – what do you want  o – specific to you  Divided into 2 broad categories Guided transmission: o Comm. Signals are guided along a solid  medium  Wireless o Comm. Signals are set over airwaves Transmission Media Twisted copper wire  o EARLIEST USE OF MEDIA o TWISTING MINIMIZES THE  INTERFERANCE o SUCEPTIBLE TO STORM DAMAGE o HIGH MAINTENANCE COST
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o DETERIORATION o HIGH FREQUENCY LOSS o SPEED AND DISTANCE LIMITATIONS -  CAN’T HANDLE NEW SERVICES e.g. DSL o Advantages: Used for telephone service Widely available  o Disadvantages: Transmission speed and distance  limitations Coaxial Cable  o HOLLOW COPPER CYLINDER o  SINGLE WIRE CONDUCTOR o LARGE BANDWIDTH o   TRANSMITS AT A VERY HIGH  FREQUENCY o   LOW SIGNAL LOSS OR DISTORTION o   MODERATLY EXPENSIVE o advantages: Cleaner and faster data transmission  than twisted pair wire o Disadvantages: More expensive than twisted pair  wire  Microwave  o TEMPORARY USE TO RESTORE  DOWNED SERVICE
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o CAN SPAN OBSTACLES  SUCH AS  LARGE BODIES OF WATER AND ROUGH  TERRAIN o 20 - 30 MILE RANGE (LINE OF SITE) o  CAN CARRY THOUSANDS OF VOICE  CHANNELS    o TRANSMITS AT HIGH FREQUENCY  RANGE o RELIABILITY DEPENDANT ON 
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This note was uploaded on 07/12/2010 for the course MIS 311 taught by Professor Cleveland during the Spring '10 term at University of Texas at Austin.

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Telecommunications - 20/02/2007 23:38:00 Telecommunications...

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