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The system was originally known as the Post Office Telephone Service or '''Post Office Telephone System''' in many countries. The term was dropped as telephone services were removed from the control of national Post Office s. POTS services include:
With the advent of electronic telephone exchanges and computerisation during the 1970s and 1980s, a raft of new network services became available. These had been termed PANS for '''pretty advanced network''' (or '''new''') '''services''' by some in the Industry , although that term has never really caught on. The services offered include:
and a number of other similar services. The new services were made possible by the introduction of the support network for the ISDN as well as raised Consumer expectations from services offered on Mobile Telephone s. One thing to note is that while Modems capable of operating at up to 56 kbit/s are available to most users, most telephone companies do not guarantee service to that speed on POTS lines as these were not meant to be Data lines. Unfortunately, this is not normally spelled out explicitly leading to unnecessary repair calls. SEE ALSO
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