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By Scott CrandellTelecommunications - T1sDigital transmission is what T1s are all about T1s are the wanted access in thelocal loop They provide multiple services simultaneously over the same medium withthe ability to have WATS international virtual networking private networking andswitched data services T1 circuits have grown from point to point links for privatenetworks to switched and dedicated access services T1s have been used for decadeswith their attributes and functionality keeping them still in use in the industry today Starting in 1960 multiplexing started with only two users that were multiplexed on onecarrier facility More and more copper was added to the local loop till1970 when a line per subscriber became too expensive and industry turned toward thetechnology of the T1 The name T1 came from ATT in the 1960s and wassomething just to name the technology till the name was picked up to describe the digitaltransmission line What the T1 did was allowed 24 voice channels onto a singlefour-pair wireMinoli The industry decided to switch to T1s because the costsavings of having 24 channels with less lines used and the room for expansion Though the switch between massive amounts of copper to T1 solved some problems the lineswere not very usable due to technology still using analog signals Digital finallystarted being used in the 1970s because it helped eliminate noise in the circuitfollowed quickly by PBX that realized the potential of the digital technology Multtiplexing for analog and digital were both used but analog used space division wheredigital used time division Since price between the two types of multiplexing wassimilar industry started to switch to digital time division multiplexing Instead ofusing cross-point technology with analog digital multiplexing was used which allowed aneight contact circuit connection be converted to a single serial datastream andtransmitted over the same copper wire Minoli Digital multiplexing uses something called pulse coke modulation The signal issampled 8000 times per second and made into 8 bits Every channel contains 64K bps withis
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