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

Sat May 8 04:03:24 EDT 2004

Hi

Is early pre 103 / 201 era or do they count as early?

Just wondering ....

	Bob Camp
	KB8TQ

On May 7, 2004, at 10:55 PM, ed sharpe wrote:

> 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.
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>
> ----- 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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