Roller connector
Roller plugs (also known as roller plugs or plugs 27 ) have been used in Germany since the 1930s to connect telephones and teleprinters . They were installed until the 1960s and were later replaced by the junction box connector (ADoS). Roller plugs were also used in radio technology and could be found on the headset of the switchboard staff . The plug connection is very robust, reliable and convenient to use because it - like the jack plug - cannot be inserted incorrectly.
In Austria it was installed - possibly only after the " Anschluss " in 1938 - until the early 1970s and then replaced by the ADo-8. It was used for the chargeable option of having several sockets for one telephone with a whole connection. Otherwise, the device was permanently attached to a junction box and company connections to the auxiliary box.
Connector - ADoS ZB 27
The telephone reel plug connection socket plug central battery 27 consists of three mutually insulated metal rings with increasing diameter, the fourth pole is on the inside as a hollow contact. This four-pole plug creates a plug connection for the two speech wires of a telephone set (ab) , it also has an earth wire and a second alarm clock connection.
| connection | meaning | Wire color |
|---|---|---|
| a | Line La of the subscriber line | White |
| b | Line Lb of the subscriber line | brown |
| c | Earth conductor ( inquiry button ) | yellow |
| W2 | Output for additional alarm clock | green |
Socket - ADo ZB 50
The matching junction box "ADo ZB 50" (old designation W 34) has a switching output for one of the speech wires for connecting several junction boxes in series. When not plugged in, the voice wire is looped through; when plugged in, the connection is interrupted so that the following socket is de-energized.
| connection | meaning | Wire color |
|---|---|---|
| a | Line La the ab interface of the subscriber line | red |
| b | Line Lb of the ab interface of the subscriber line | black |
| c | Earth conductor ( inquiry button ) | yellow |
| W2 | Exit for second alarm clock | White |
| a1 | switched line a to the second socket | red |
Individual evidence
- ↑ Michael Brandes: Sheet writer Siemens T37g (slim keyboard, year of construction 1952). Image gallery. In: Fernschreibamt Hausneindorf (old page). August 5, 2013, accessed May 15, 2019 .
- ↑ RFT - perforated tape transmitter T 53 (year of construction 1977, inventory no .: 33406). In: Object and photo database online in the museum in the Runden Ecke Leipzig. Citizens Committee Leipzig eV, accessed on May 15, 2019 .
-
↑ a b Gerhard Bröderbauer: telephones with bakelite. In: Historical Telephones. Retrieved on May 15, 2019 (a) Desk apparatus 121 - Austrian Post and Telegraph Administration ÖPT - built in 1950 - Schrack, Vienna;
b) Desk apparatus 121 - Austrian Post and Telegraph Administration ÖPT - built in 1958 - Schrack, Vienna;
c) Desk apparatus W48 - Deutsche Bundespost - built in 1963 - Siemens- / Schuckertwerke AG;
d) As an extension with earth button: Tesla T65S desk phone - Deutsche Post (GDR) - built in 1968 - Tesla Werke, Prague).
literature
- Telecommunications Technology Handbook - Basic Series - Volume 6. Deutsche Postgewerkschaft - Main Board - Publishing House, Frankfurt 1973.
See also
- Telephone socket
- TAE , telephone connection unit
- RJ-XX - Western plug (US standard)
- Telephone desk set
