| 摘要 |
<p>Disclosed is a local message metering system for metering information concerning each subscribers use of a telephone system. Each subscriber is directly connected to the measuring system with a multistate signal which indicates the line usage by a subscriber. The multistate signal for each subscriber is digitally encoded, scanned and interpreted by the metering system and pertinent information is recorded in memory. The metering system has memory automatically recording the calling subscriber's directory number, zone called, call duration and time of termination including one memory location for each subscriber. The message metering system additionally includes self-checking features and a service observing unit for detailed observation of the system use by selected subscribers.</p> |
