Type OJ carrier telephone system

The oj carrier system is designed to provide economically, on open-wire lines, additional circuits up to 500 miles in length of quality consistent for use in the nation-wide toll dialing network. It is a 12-channel system in the frequency range of 40 to 148 kc (kilocycles), capable of operation on the same wires with type C or type OA systems and on the same pole line with type J or similar systems. It is intended for the same field of use which type J has filled successfully and has been designed to give high quality transmission, freedom from service interruption and ease of maintenance. It employs miniature components for cost and space saving, and modern arts in the design of niters, equalizers, and amplifiers. Many of these components were taken from the O carrier system1 and hence the designation OJ for a system similar to O in its composition and occupying the type J field.2