[VoIP] Minimal Electro-Mechanical Switches

[Steph Kerman]

Also, if one is not fixated on having a 7-digit system like Michael 
built that emulates local CO dialing, a 3-digit minimal system can be 
built consisting of a single LF, a single SEL and a single CONN.  Such a 
system need not exceed 23" width, a much more convenient form factor. 

A multi-path system can be fit in a 36" high, 18" deep, 24" wide 
"tombstone" cabinet.   If you are lucky enough to find 
Selector-Connectors, which function like a connector on lower levels 
which terminate on lines and like a selector on upper levels which serve 
outgoing trunks, you can fit it a 3 path system all in such a cabinet.  
A 3 path system with LFs and separate selectors and connectors needs a 
7' tall, 23" wide relay rack.  But this can be reduced to 36" height by 
using double-sided construction as most PBXs did.

Steph

John Novack wrote:
> Russ Price wrote:
>   
>> After I saw that little demo switch come up on eBay and end up with "reserve not met" on a final bid well north of $1000, it looks like I'll need plenty of quatloos to go with the round tuits and the real estate. :o)
>>     
> One could probably build one for less, if one's time has no value.
> Michael Carter was the owner/seller, and he values his time.
> The switch was bought by someone in Las Vegas NV, who said it was going 
> into a railroad Museum
>
> Several CNET members are either in the process or have built small 
> switches, so there is plenty of help available when the time comes.
> Hardest to find without building a repro will be tone plants.
> Chuck Richards had a series of articles in the TCI newsletter some years 
> ago on building a solid state int and tone plant.
> Michael Carter built one for the above switch.
>
>
> John Novack
>