Test handset for suppressors

"Test handset for suppressors" (issue 1 or 1a) used by the Federal Post Office in the period 1952 to 1985.

Telecommunications technician from Telekom Malaysia with test equipment on a cable distributor .

The test handset for interference suppressors , also known as test telephones, is mainly used by telephone interference suppressors (later professional titles: telecommunications technician , communications electronics technician , system computer scientist, electronics technician for information and system technology) for debugging landline connections and to isolate errors, but also by employees of telecommunications construction for testing of the telephone network . Because of the shape of the housing, the Bundespost's Issue 1 test handset was also commonly referred to as the “bone”.

It differs in its circuit structure from the hand-held testing device for exchanges in that it also has a number switch on the back of its handset body, which is small in historical devices, or a keypad for newer devices , with which calls can be established via two-wire connections. Next to this is a switch to turn the test phone on or off. A three-wire connection cable with banana plugs at the ends allows a connection to be established from extensions or their connection lines . For this purpose, the third wire is routed through a push button located on the side of the handset testing device, which, when actuated, can give earth impulses to the respectively required speech wire if the third wire is earthed.

To protect against mechanical damage and moisture, older test handsets were covered with a thick protective rubber cover. Newer devices are made of a robust plastic.

literature

• Manual dictionary of electrical telecommunications , 2nd edition, volume 2; P. 1317
• Instruction sheets of the German Federal Post Office Issue B telecommunications
  • Werner Reis ( FTZ ): The new handset testing at the Deutsche Bundespost ; Volume 42, Issue No. 5, 1989; Pp. 135-143
  • Frank Ostheimer (Deutsche Telekom Center for Terminal Devices , Darmstadt): ISDN test telephone 93i ; Volume 49, Issue 7, 1996; Pp. 350-362
• Wolfgang Harderich; Frank Ostheimer: ISDN test telephone , in: telekom praxis , issue 2/1995; Pp. 27-34.

Web links

Commons : Lineman's handset  - collection of pictures, videos and audio files

• Vendor / manufacturer of handheld testers

Individual evidence

1. ↑ ^{a b} Concise dictionary of electrical telecommunications; 2nd edition, volume 2; P. 1317.
2. ↑ The new handset testing at the Deutsche Bundespost; P. 135.