[GreenKeys] GreenKeys] Re: i-Telex machine question

[Wa3frp]

Message: 4
Date: Sun, 29 Nov 2015 17:18:28 +0100
From: Henning Treumann <df3oe.henning at googlemail.com>
To: GreenKeys <GreenKeys at mailman.qth.net>
Subject: [GreenKeys] i-Telex machine question
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	<CAGcpztg6rK2+HBTw0Bt_SsDzTuaEQ=k8NpSZas-bvXak5NawSA at mail.gmail.com>
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The Western Union Telex Network in the USA was built around the Siemens TWM-2, TW-39, TWK-4 and TW-56 exchange protocols.

Therefore, there was no automatic timer switch for an line idle. 

It makes economic sense to keep the billing pulse counts incrementing!  And, why break a perfectly good connection in case an operator was distracted or otherwise busy.  

All of the Western Union Call Control Units, using both loop and polar line modes were configured to start the associated machine on an incoming call.  The machine would only turn off (disconnect) when a long space signal was received, but I can no longer remember if that was 1, 2 or 3 seconds.

There may be situations where teleprinters in the United States had the automatic timer switch but not in the Western Union Telex Network.  The same was true for the CNCP Telex Network in Canada.

I do have a complete Western Union Telex machine, a Teletype Model 28 ASR with answerback = WUTPAM CHIL,  Telex Number 834328 that could interface to your network via the Internet. I did consider this in a prior time but the cost of the interface board was expensive. 

73

Russ - former WU Telegraph Telex Manager for Pennsylvania, New Jersey and Delaware (1969 - 1985)

>Is it common that they are fitted with an automatic timer switch?
>I myself have a couple of machines in my collection that
>were in use at US Army Germany, Siemens  T37 and Lorenz Lo15s
>(all USTTY alphabet), all of them have an automatic timer sitch for
>switching off mains after about a minute of idle.
>So I wonder if this was normal or an extra in your (not Telex) networks.

 
Russ - WA3FRP
wa3frp at aol.com

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