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[The World of Cryton: *ELITE*]
The Numbering Plan
by
Terminus
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Dial Telephone Service has many prerequisites,but none are more fundamental
than a numbering plan.This numbering plan establishes the structure within
which dialing procedures can be applied.It must accomodate:
o All authorized address devices
o All users,including those concerned with system testing and maintenance.
Dialing must follow a prescribed sequence.First there may be a need for one
or more prefix digits; next, the address must be transmitted; and finally a
suffix may apply.The basic address format ( used in North America ) consists of
10 digits with a 3-3-4 subdivision,corresponding to (1) the numbering plan area
code,(2) the central office code,and (3) the station number. With
international direct distance dialing (IDDD),standards become a matter of
global concern.In 1964,a CCITT study established 11 digits as a preferred
maximum length for international numbers.The following world assignments have
been made:
1 Canada,United States
2 Africa
3,4 Europe
5 Central and South America
6 South Pacific
7 Soviet Union
8 North Pacific
9 Far and Middle East
0 Spare
But there is no standardization in the way the dialing is done for inter-
national connections.Germany,Switzerland,and Italy use '00' to access an
international line,and '0' to access a national long distance (area code)
number.Correspondingly,France uses '19' and '16' followed by the inter-
national or area code.
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