Types of telephone exchanges Over the years, the capacity of the telephone exchange has continued to grow. Fewer and fewer people were also needed for operation and maintenance. Photos above portray this development. In 1926, approximately 1 operator was needed to serve 100 customers. In 1960, 1 maintenance engineer was needed per 1000 customers to […]
Telephony equipment in the old post office
Telephony equipment in the old post office After this building was completed in 1924, all the services of the PTT (Post Telegraaf and Telephone) were successively moved in. In 1926, telephony services started in this building with 4400 customers from the city of Utrecht who were connected to a new automatic exchange. These connections used […]