[VoIP] Spotted On Ebay

Mon Feb 4 00:26:51 CST 2008

So long as its are operational you should be able to make something out of 
the large uniselector.

You might be able to make a subscribers linefinder but you would really need 
more then one.

With a bit of imagination you could possibly wire it so you have  an 
extension connected to some of  the set of contacts around the edge .
Then with some relays for subscriber line relay and cut off relay. You could 
wire it so when any extension is picked up the uniselector hunts until
it finds that extension.  Then it connects to your one final selector 
allowing you to have a two digit numbering system for your telephone 
exchange.

Another use maybe in what they call a pulse set.  These are normaly where 
the ring tones, dial tones etc can be feed to different contatcs on the 
uniselector.
For example on one set of contacts around the outside you might wire the 
contacts together in certain groups to give ring tone cadence.  Eg 5 
contacts next to each other might be wired to the ring tone and each other 
then the next two aren't then the next 5 are etc.  So for five steps the 
wiper tag has ring tone on it you can use to ring the called phone.  The 
next two give silence then 5 steps give ringing etc
You get the idea.

But if no one has told you already try and get hold of a book called 
"telephony"  volume 2 Automatic Exchange systems by Atkinson .  There are 
earlier editions known by the authors name Herbert, Proctor.  An edition 
from 1960's or '70's will be a great help to you.  Apparently it use to be 
the bible for exchange technicians.
It goes through explanations of different basic circuits in the exchange 
such as hunting, testing, holding circuits, how selectors work etc.

It is well worth getting hold of a copy you will learn a lot from it and can 
use it to help you design a basic mini exchange.
You may have to use one of those international secondhand book sellers on 
the web.
But if you buy one book to help you, you need Atkinson.

I am still hunting for parts to build a model exchange myself.  But as I am 
a volunteer in Telecommunications at a museuem I get to play with old gear 
and have experienced techs around me to teach me.

Good luck I look forward to calling into your exchange.

Brent

----- Original Message ----- 
From: "Mad Mark" <madmanmarkau at hotmail.com>
To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
Sent: Monday, February 04, 2008 6:09 PM
Subject: Re: [VoIP] Spotted On Ebay

>
> Yeah, I'm in Oz, so shipping is fairly cheap. I'll bid on them - if they 
> don't work/can't be used, they can always go into my collection as show 
> pieces or something.
>
> And I believe the seller doesn't know too much about them. I *think* (s)he 
> is auctioning off his/her deceased uncles possessions, and is not into 
> telephone equipment themselves.
>
> Thanks.
>
>> Date: Sun, 3 Feb 2008 23:56:33 -0500
>> From: stfkerman at jps.net
>> To: voip at ckts.info
>> Subject: Re: [VoIP] Spotted On Ebay
>>
>> My thoughts are that the photos are so small that even though I am
>> somewhat familiar with British equipment and highly familiar with North
>> American equipment, IMO not enough can be determined about them to be
>> confident that they would be useful.
>>
>> Very specific details about these kinds of parts determines whether they
>> will fit a specific application.   If you had seen these earlier and
>> gotten more info from the seller, that might have given more certainty.
>>
>> Are you in Oz, such that they would not need to be shipped
>> internationally?  I should add that I don't know what the exchange rate
>> is so I can't judge the pricing.
>>
>> Steph
>>
>> Mad Mark wrote:
>> > Someone on the CNET-UK-I mailing list spotted these items on E-Bay:
>> >
>> > 130193124276
>> > 130193124377
>> > 130193124440
>> >
>> > I'm just wondering if they could be used in conjunction with my 
>> > Strowger 2000-type rotary final selector, to maybe construct some kind 
>> > of frankenswitch. There's only about 4:30 left on the auctions, so I'm 
>> > hurrying.
>> >
>> > Any thoughts, anyone?
>> >
>> >
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