[GreenKeys] switch mounting systems

[Joe Stevens]

There are steel bars with holes, tapped 12-24, usually horizontally 
mounted in a standard relay rack.  There are steel frames with the 
same unit mounting dimensions in 1A2 key systems and some other 
subscriber equipment cabinets.  The multi-voltage power supply I 
mentioned that puts our ringing, 24 vdc, 10 vac, and 18vac will mount 
on this system.  The bars are 6.5 inches from screw center-to-center 
and have 15 holes along the bar per 6.5 inches for about 11mm 
spacing.  Wescom, Telco Systems and others made all sorts of units 
that would mount on these bars.  Perhaps someone else could 
contribute a bit of history or some more info.  What's with that 
weird hole spacing?  That supply on ebay is shown on it's side. It 
would mount with the mounting tabs on top and bottom.  One could 
fabricate such a system by drilling some small angle aluminum.  I've 
never seen a source for the original bars that mount in 19 inch racks 
but I'll bet someone has a stash in their closet...

You might want to investigate http://www.switchersquarterly.org

     ...j0e  WL7AML

At 09:44 AM 2/11/2009, amourdutigre wrote:
>Hi again,
>
>I have noticed that on the ring signal supplies that they all seem 
>to have the same type of mounting dimensions. Example is this E-bay 
>item 200280976107. Is that some sort of Western Electric standard? I 
>remember as a teen seeing surplus "relay racks" being advertised in 
>the backs of electronics magazines, long before there were any such 
>things as network servers and the like.
>
>Just curious....(I know that this is a TTY forum, but there is so 
>much in common between TTY, Telegraph and telco systems.)
>
>Thank you in advance
>
>Joe KB0TXC
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