AUTOMATIC SWITCHBOARD No. OL 500
|Automatic telephone switchboard
Type OL 500
This automatic telephone switchboard is suitable for large offices, stores, banks, factories, saw mills, small municipalities etc., when the number of simultaneous conversations does not exceed 24.
This switchboard is built up of racks, on one of which is mounted all the apparatus common to the connected lines (independent of the number of these lines), and on similar racks the individual arrangements for each subscriber’s line are mounted.
These latter racks are for 50 lines each and can be easily added to an existing switchboard.
When 6, 12 or 18 simultaneous conversations are sufficient, a considerable saving can be made.
By means of the dial the desired connection is completed in the following manner:-
When the conversation is finished and the two micro telephones replaced, the two lines are at once automatically released.
In such places, where it is not necessary to be able to call, but only to receive calls, common telephone sets without dial can be utilised. Such sets can also be substituted by bells or other signals if desired.
The automatic telephone switchboard is so arranged that it can by special dispositions be connected to a public telephone exchange, if this is allowed by the authorities.
In this case the public exchange is called automatically. The calls from the public exchange are distributed at the automatic telephone switchboard by an operator or any other suitable person, by means of a special switchboard, see Sheet No. 634a,showing a switchboard for 12 exchange lines (pictured to the right).
Taken from the L. M. Ericsson Telephone Catalogue No. 1921
Last revised: October 09, 2019