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PBX (private branch exchange), also called subscriber PBX, is a telephony PBX within a company that isn’t public. The PBX MD110 was a huge export success for Ericsson.PBX is also called subscriber PBX and comes in diffrent sizes.The connection in a PBX goes through internet or ISDN.Up until the 1980s, Televerket has monopoly on PBX.It can be divided into two categories automatic and manual.It’s a telephone PBX for for companies and authorities.The acronym PBX stands for private branch exchange.How PBXs will look in the future is hard to predict. The faster development goes the more automized society will become. The manual PBX is going out of fashion, at least in Sweden. Modern automatic PBXs consist of software. Subscriber PBX can be divided into two categories – manual and automatic. The connection goes through internet or ISDN. A PBX can have various connections as well as mains (also called central mains). It’s a PBX for authorities and companies and isn’t as of yet available for the general public. PBX stands for private brand exchange and is also called subscriber PBX. Below we’re about to take a closer look at PBX and figure out what it actually is and how it works.