The North American Numbering Plan, 22-October-1947
- 56 years ago on this date, 22-October-1947, Harold J. Ryan of AT&T dated
and issued a memo titled:
"Numbering Plan Area Arrangements -- Toll Area codes -- Letter to all
General Traffic Managers -- attached Map and List of Codes".
There had been several preliminary plans drafted for automating the
long-haul switching and routing of telephone calls in the US and Canada
including a numbering/dialing plan, *before* October 1947, some of the
plans were about routing and switching hierarchy/etc., and equipment
installation (Crossbar, Card-Translators, etc); There were about three
different draft attempts at a numbering plan in the early/mid 1940s,
but it was Mr. Ryan's MEMO of 22-October-1947 that included the map and
list of the original 86 area codes of the US and Canada, in the format
that was actually impelemented and built-upon over the next 50+ years.
So, while there WERE some earlier plans which ultimately were "evolved"
into the "finalized" draft of October 1947, it was on 22-October-1947
that one "could" say that the North American *NUMBERING* Plan, of area
codes as we have known them as they have developed and further evolved
of the decades, was "born".
I prepared a report on this and the 56-some years of developement of the
NANP, and posted it to the TELECOM Digest. Pat sent it out late Tuesday
night/early Wednesday morning (US/Canada times).
I'm not going to re-post it here because it is well over 35-KB, although
it is only done as *PURE ASCII* .txt! ... But for those interested....
it can be found at the "Telecom Digest Online", as well as
comp.dcom.telecom (moderated) Usenet Newsgroup. I don't have the
"exact" addresses at TD-Online nor at Usenet (c.d.t), but Pat did
email it as a sequential numbered issue (v.22 n.712) for those who
receive TD as an emailed "Digest",
AND it can be viewed/downloaded/printed (as v.22, n.712) from the
TELECOM-Digest Archives site:
Pat also put a copy into the Archives as a "report":
and in the Archives under "History":
And Pat (or Lisa) also "mirrors" Telecom Digest at Yahoo as well as the
Yahoo Group "telecom-news". My NANP 56th anniversary report at:
Mark J. Cuccia
mcuccia (at) tulane (dot) edu
New Orleans LA USA