Pentaconta telegraph switching system

Initially outlines the switching characteristics of Pentaconta system. Each country will have at least one international centre, equipped with signal adapters to interwork with all known signalling systems: particular attention is given to the coaxial cable system for 2700 circuits, the microwave radio RL4H in slimrack construction, and the security of intelocking systems for railroad track switching. A description is given of the operational sequence when a call is originated by a subscriber connected directly to the international exchange, or when a national or international incoming call is made. The main centre, secondary centre and satellite exchanges are outlined, and the subsidiary circuit components are described: line circuits; connecting circuits; registers; classification circuit; trunk circuits; and metering for tariff. Finally the operator positions, the equipment frames, equipment layout for a secondary centre, and terminal satellite exchanges are considered. The equipment required for secondary centres is indicated in tabular form.