[VoIP] Another WE question

[Jayson Smith]

Hello,
So, I get the picture, there was never a WE set with sixteen buttons that
wasn't designed for Autovon, right? From what Lucky225 had said, I thought
maybe there was. Obviously an Autovon phone would probably be much more
expensive than the $10.50 plus shipping I paid for my 2500 set, and I don't
know how I'd use one, with it being four-wire. Interesting discussion
though!
Jayson.

----- Original Message ----- 
From: "John R. Covert" <john_reads_cnet_via_archives at covert.org>
To: "CNET" <voip at ckts.info>
Sent: Friday, March 16, 2007 11:01 AM
Subject: [VoIP] Another WE question


> >Autovon was a 4W network
>
> Although Autovon was a 4W network, 99.99% of Autovon calls were
> placed by "users", not "subscribers".  Users did not have special
> phones at all.  Autovon "users" accessed the network by dialing "8"
> from the PBX or Centrex serving the military installation.  So even
> though every 202 OXford x-xxxx number at the Pentagon also had the
> Autovon number 22x-xxxx, not one of those phones was a four-wire
> phone.
>
> Only Autovon "subscribers" on direct Autovon lines running directly
> out of the hardened Autovon switches would have been arranged for
> 4-wire operation.  Thus the four-wire phones were rare, and would
> almost always be an additional, separate phone except in those rare
> places where no PSTN access was needed (since there was no direct
> PSTN access from Autovon, one always had to ask a base operator
> somewhere to extend the call as a courtesy).
>
> I think the 3568 phones could be arranged so that the 4-wire
> capability was only in effect on certain keys, so that it was
> possible to have both 2-wire PBX and direct Autovon lines on
> the same set in the same key system, but I never saw this done,
> which is not to say that somewhere with  direct lines on a
> large number of desks this was not done.
>
> Every phone with a type 66 Autovon keypad which I ever saw was
> a 3568, even if there was only a single line on the phone.  There
> were a few special arrangements in tactical consoles wherewould be a type
66 keypad in the console connected to some sort
> of custom arrangement.
>
> The lines in the Autovon switch were class-marked with the
> highest priority authorized for use.  The mere presence of the
> "FO" button on the phone did not mean that phone could place a
> call using it, since Flash Override was reserved to "(1) The
> President of the United States, Secretary of Defense and Joint
> Chiefs of Staff, (2) Commanders of unified and specified commands
> when declaring either Defense Condition One or Air Defense
> Emergency and other national authorities the President may
> authorize."  It should be noted that the whole precedence system
> has been redesigned and the precedences renamed.
>
> A four-wire arranged phone still did all of its loop signalling
> on a standard loop circuit which carried the transmit (from the
> phone) path; this was connected to the network in the normal
> manner.  The four-wire difference was that the receive path
> went directly (through only surge protection) to the receiver.
> I'm pretty sure the 3568 sets also had a small local side-tone
> generation circuit to provide a natural feel.  Switching was
> provided by specially modified No. 5 Xbar and a special version
> of the No 1 ESS.
>
> I may have located a source of 3568 sets through Google.  The
> date of the blog entry I found was last December, and I'm
> trying to contact the blogger.
>
> There may have been a phone in temporary production called the
> 3500, but it was a 1954 cross between a model 300 and model
> 500.
>
> /john
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