A new telegraph serviceboard using electronic circuits

THE large increase in the use of teletypewriters in the Bell System in recent years has necessitated the development of improved arrangements for interconnecting telegraph facilities to form the networks employed by private-line services (also called leased-wire services). Greater flexibility is required in order to permit these networks to be built up and rearranged quickly to meet ever-changing customer requirements. With continuous improvements in the operating stability and reliability of telegraph line facilities, together with greatly increased demands from government and industry, private-line networks have become vastly complex.