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Unshielded Twisted Pair has been designed for use in voice applications and local area networks. Because of the relatively low cost, this cable is widely used and is available in several different performance categories
The first thing you would notice about PBX, which stands for Private Branch Exchange, and PABX, which stands for Private Automatic Branch Exchange, is the presence of the word automatic. This gives a hint on how the two differ from each other. Basically, a PABX is just a type of PBX that is automated.
PBX is a very old concept in telephony that started long before electronics were involved in it. In its earliest days, As technology evolved, new improvements were a PABX was created for the new automated system while PBX was used to identify the older manual system.