Siemens Telex TWK

[WA3FRP]

Hier sind die Fotos von einer Reihe von Telex verwandten Artikeln aus meiner Sammlung.

Jeder Artikel steht im Zusammenhang mit dem Siemens TWK Telex Exchange.

Erinnern Sie sich an irgendwelche dieser Einzelteile?

[WA3FRP]

Since there have been no replies, I will tell you about each item.

The first picture is of the key that was used to lock and unlock the Siemens modules in the TWK exchange,

The second, third and fourth pictures are of the counter that was used for local exchange traffic studies. For example, a technician could use the counter to determine the number of times a Telex subscriber was busy when an incoming call was received. These traffic studies were important for both the Telex customer and the Western Union Sales organization. Other uses for the counter were times when all trunks were busy and a customer requested to make an outgoing call. If all trunks were busy, the customer would not receive a dial light.

The last two pictures are of the magnets and cleaning tools for the Siemens TWK exchange ESK relays. The magnets were used to force operation of a relay, when in maintenance mode, in order to locally troubleshoot a module problem. The cleaning tools were used to clean the relay contact, which were open to the air.

For additional information on the Siemens TWK-4 Telex exchanges, please see this article from the Western Union Technical Review in July 1966:

http://massis.lcs.mit.edu/archives/tech ... 3/p096.htm

and

http://massis.lcs.mit.edu/archives/tech ... 3/p097.htm

and

http://massis.lcs.mit.edu/archives/tech ... 3/p098.htm

and

http://massis.lcs.mit.edu/archives/tech ... 3/p099.htm

and

http://massis.lcs.mit.edu/archives/tech ... 3/p100.htm

and

http://massis.lcs.mit.edu/archives/tech ... 3/p101.htm

and

http://massis.lcs.mit.edu/archives/tech ... 3/p102.htm

and

http://massis.lcs.mit.edu/archives/tech ... 3/p103.htm

and

http://massis.lcs.mit.edu/archives/tech ... 3/p104.htm


I wonder if any of these exchange have survived in a museum.

73

Russ WA3FRP

[DF3OE]

Hi Russ,
I think, this system was only for export and never in use in Germany.

[WA3FRP]

I wonder then if any Telex exchanges built by Siemens in the 1960's and 1970's using the ESK relay technology are now in museums or private hands. The TW39 was an excellent exchange and I managed one of those exchanges in Pittsburgh Pennsylvania USA but it was eventually replaced because the Telex subscriber count exceeded the capacity of the exchange. Other than the TWK-56, the TWK-3 and the TWK4, there also was the TWK-D exchange. However, I recall that the TWK-D was only a trunk to trunk exchange and did not have the capability to also handle customer connections. It would be interesting for me to find out what the Telex exchange technology, used in Germany in the 1960's, the 1970's and the 1980's, represented and if any of those German exchanges survived until today.