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traditional telecoms | how it works
Traditional telecoms work in much the same way. Desk phones are connected to a pbx (private branch exchange), which is a phone system that connects internal telephones to an external PSTN (public switched telephone network) line, normally an ISDN30, via a telephone exchange. The PBX connects internal extensions with outside callers using integrated software and incorporates capabilities such as voice mail, call transferring and call statistics. PBX systems are traditionally leased or bought outright and are major pieces of capital expenditure or major monthly charge.
Company computers are traditionally linked to a broadband line, which allows internal computers access to the internet. The internet connection is through the telephone exchange which then links to web sites and other computers in the same way that telephone calls are routed.
Mobile phones, when switched on, connect to the nearest base station. As you move around you may get closer to another base station in another cell. When this happens, the network automatically switches your phone to the other base station. If the base station that your phone is switched to is already working to its full capacity it cannot take in your signal. If this happens you may get a drop out for a short while and your phone will not work in that area. Dropped calls can also happen when you are in an area where cells do not overlap.
