*********Re: [GreenKeys] Re: Bell System History

Sat May 8 03:55:17 EDT 2004

looking for examples of early bell datasets for the museum.

Thanks Ed Sharpe archivist for SMECC

Please check our web site at
 http://www.smecc.org
to see other engineering fields, communications and computation stuff we
buy, and by all means  when in Arizona drop in and see us.

address:

 coury house / smecc
5802 w palmaire ave
glendale az 85301

----- Original Message ----- 
From: "Don Robert House" <[email protected]>
To: <[email protected]>
Cc: "Ed Hickey" <[email protected]>; "Bob Liddy" <[email protected]>; "Bob Cnota"
<[email protected]>; "Ken Clinkman" <[email protected]>; "Bill Henry"
<[email protected]>; "Phil Schelinski" <[email protected]>; "Steve
Kissinger" <[email protected]>; "Warren Brader"
<[email protected]>; "David Weil" <[email protected]>;
<[email protected]>
Sent: Friday, May 07, 2004 6:13 PM
Subject: [GreenKeys] Re: Bell System History

> Thanks Ben,
>
> Did you have any experience with the 205B dataset for secure voice or
> maybe it was secure data.  What was AUTODIN?
>
> Don
>
> >More trivia from Autovon.   You are correct in that the extra four
> >buttons were FO, F, I, P.  However, this was a later version.    The
> >four buttons were as follows:
> >
> >                                    Early     Meaning        Later
Meaning
> >                 Top:            SF        Super Flash     FO
> >Flash Override
> >                                      F          Flash
> > F        Flash
> >                                      I           Immediate        I
> >Immediate
> >                Bottom:        P         Priority                P
> >Priority
> >
> >There were five levels of precedence.  If you just picked up the
> >handset and dialed a call, the precedence level was routine.  If
> >things were OK, your call would go through.   However, if we were in
> >a nuclear war, and some of the network had been bombed out, you
> >might not get dial tone.  Or maybe you would get dial tone, but then
> >a fast busy after dialing.  In this case, you punched P before the
> >call, which bumped you up to Priority.   And so forth on up to the
> >highest of the five levels, originally called Super Flash, and later
> >Flash Override.  It was felt that the term "Super Flash" had too
> >much Buck Rogers in it.
> >
> >If the network was congested, and you came in at a higher level of
> >precedence, you might cause a lower level call to be disconnected.
> >At the time of disconnection, a tone was injected to the original
> >call so they would know why they had been dumped.
> >
> >The original network had four each 4-wire switching centers, and
> >each telephone homed on two offices, which was a neat trick.
> >Equipment at your base would decide, when you went off hook, which
> >CO your call would be routed to, and the other CO got a data message
> >telling it that you were busy off-hook.   This was probably an early
> >form of CCIS or SS7.  The whole idea was that one of the four
> >switches could get nuked out, and all of the stations on Autovon
> >could still talk with each other, although with reduced trunk
> >capacity.
> >
> >The locations of the four CO's were, and probably still are, secret.
> >The trunks went on coaxial cable buried at least four feet down,
> >over routes which were also secret.  The story was that the CO
> >machine were at least two stories underground, making them
> >impervious to all but a direct hit from a nuke.
> >
> >Ben Stephens=
> >
>
>
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