Abstract
UNTIL a few years ago, practically all trunk telephone working was done on a delay basis. The principle involved an extravagant method of operating, namely, the segregation of trunk mains into small groups, each of which was controlled by a telephonist. In the Engineering Supplement to the Siemens Magazine of March, Mr.?.?, Humphries gives an instructive discussion of the whole subject, laying stress on automatic equipment as an aid to trunk switching. With such an aid, a telephonist can occupy her time fully with other switching duties during a waiting period, and need concern herself with a waiting call only after receiving a signal that a free trunk is available. Remotely controlled automatic switches provide the telephonist with access to a multitude of all trunks. An analysing device in the automatic unit automatically determines which course should be followed. The telephonist leaves the circuit in this waiting condition and proceeds with other work, the supervisory lamp on the trunk side of the connexion giving a fleeting signal every six seconds to remind her that there is a call awaiting completion.
Article PDF
Rights and permissions
About this article
Cite this article
Automatic Equipment in Trunk Telephone Working. Nature 147, 742 (1941). https://doi.org/10.1038/147742d0
Issue Date:
DOI: https://doi.org/10.1038/147742d0