[TUHS] Known Specimens of Pre-5ESS UNIX Telephone Switching Software?
Sebastien F4GRX
f4grx at f4grx.net
Wed Sep 27 02:07:34 AEST 2023
Hello,
You beat me to it! I was about to reply that the Connections Museum of
Seattle would have more info about this, or know people who do.
This video of their channel shows a 3ESS software boot :
https://www.youtube.com/watch?v=k865-VjWUk8
Sebastien
Le 26/09/2023 à 04:20, Kevin Bowling a écrit :
>
>
> On Mon, Sep 25, 2023 at 6:25 PM segaloco via TUHS <tuhs at tuhs.org> wrote:
>
> Hello, my studies lately bring me to the question: Are there any
> extant examples of telephone switching software, built on UNIX,
> from the various parts of the Bell System prior to the
> introduction of the 5ESS and 3B20D? My focus veers earlier as
> some 5ESS/3B20D/DMERT technology is still in active use, that
> sleeping dragon can lie.
>
>
> Your best bet may be to contact Sarah Autumn at the Connections
> Museum, they have a 1ESS and 3ESS.
> http://www.telcomhistory.org/connections-museum-seattle-exhibits/electronic-switching/
>
> I don't remember if they have the 1A variant but they should have the
> BSPs for all of this which would give you a lot of what you are after.
>
> What's gotten me curious is reading about 1ESS in a BSTJ volume I
> picked up, noting the particulars on how previous concerns of
> manual and electro-mechanical systems were abstracted into
> software. Even without surviving examples, were previous systems
> such as the 1ESS central control ever ported to or considered for
> porting to UNIX, or was the hardware interface to the telco lines
> too specific to consider a future swap-out with, say, a PDP11
> running arbitrary software? Columbus's SCCS (switching, not
> source code) also comes to mind, although all I know that survives
> of that is the CB-UNIX 2.3 manual descriptions of bits and pieces.
>
> By the way, it's funny, I have UNIX to thank for my current
> experiments with telephones and other signalling stuff, what with
> making me study the Bell System more generally. It's starting to
> come full circle in that I want to take a crack at reading
> dialing, at least pulse, into some sort of software abstraction on
> a SBC that can, among other things, provide a switching service on
> top of a UNIX-like kernel. I don't know what I'd do with such a
> thing other than assign work conference call rooms their own phone
> numbers to dial with a telephone on a serial line...but if I can
> even get that far I'd call it a success. One less dependency on
> the mobile...
>
> - Matt G.
>
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