TELEPHONE ALLOTTER CIRCUIT FOR EQUALIZING CIRCUIT USAGE

摘要

An auxiliary control system is connected to each control lead of each of the connectors in each group of connectors associated with the last or what is commonly called the fifth selector in a telephone central office. This auxiliary arrangement effectively supervises use of each of the connectors and by placing a substitute ground on each connector after its use prevents any individual connector once used from being used again until all other connectors in that group have been used.