Chargeable program receiving limit setting system in two-way cable television system

摘要

A CATV television system in which a subscriber can only charge a maximum number of events before the central facility polls the subscriber's terminal unit for charged events. The subscriber's terminal contains a credit limit register which contains the maximum number of chargeable events. The central facility can change the individual subscriber's credit limit register, dependent on credit worthiness, by a command sent over the CATV lines.