Cell Phone Network Technologies: 2G
Cell phone mesh fall into three categories : 2 G , 3 G and 4G. In 2 gramme meshing , there are three common technologies used for convey information :
Although these engineering vocalize very intimidating , you may get a practiced sense of how they ferment just by breaking down the title of each one .
The first word tells you what the access method acting is . The second Word of God , " partitioning , " countenance you know that it splits calls based on that access method .
The last part of each name is " multiple admittance . " This simply means that more than one user can utilise each cell .
FDMAseparates the spectrum into clear-cut voice channel by splitting it into uniform chunks of bandwidth . To well understand FDMA , recollect of radio stations : Each place charge its signal at a different relative frequency within the available band . FDMA is used mainly for analog transmission . While it is certainly capable of extend digital information , FDMA is not reckon to be an effective method for digital transmission .
TDMAis the access method used by theElectronics Industry Allianceand theTelecommunications Industry Associationfor Interim Standard 54 ( IS-54 ) and Interim Standard 136 ( IS-136 ) . Using TDMA , a narrow band that is 30 kHz wide and 6.7 milliseconds long is split time - wise into three clip slot .
minute set means " channel " in the traditional good sense . Each conversation gets the radio for one - third of the time . This is potential because articulation data point that has been converted to digital selective information is compressed so that it aim up importantly less infection space . Therefore , TDMA has three times the capacitance of an analogue system using the same identification number of duct . TDMA arrangement manoeuvre in either the 800 - MHz ( IS-54 ) or 1900 - MHz ( IS-136 ) frequency bands .
