Abstract: A miniaturized DNR monitoring device is adapted to communicate over a telephone line, or otherwise, with a remote unit which may also communicate with other monitoring units. The monitoring device includes a computer chip program to select target DNR data from non-target DNR data, a memory for storing a limited amount of data, a DNR output line, means for downloading stored data over its output line to its remote unit on command or upon the occurrence of preselected events, and means for identifying transmissions to and from its remote unit by a handshake routine.

Abstract: In a telephone monitoring system a number of telephone lines are simultaneously monitored by a single monitor unit which connects the respective voltage signals transmitted by the lines into input signals having a digital format to a corresponding number of personal computers or in the alternative to a mainframe computer which is accessible by a number of keyboards corresponding in number to the number of lines being monitored. An operator responds to the input signals from the telephone lines by entering comment data through the keyboard as the data corresponding to the input signals is simultaneously displayed on the screen associated with each keyboard. Each personal computer or the single mainframe is programmed to store, retrieve and analyze the data simultaneously received from the monitor and the respective keyboard.

Abstract: A telephone monitoring system is disclosed which enables the operator to enter comment data and sort comment data entered by the operator and numerical data received from a monitor while the monitor continues to imput information from the target line. The system is comprised generally of a monitor capable of being attached to a target telephone line and when so attached senses voltage changes on that line and translates those voltage changes into a form capable of being stored in the memory, an alphanumeric keyboard, a memory unit storing a program capable of storing data received from the monitor and the keyboard, a processing unit and a display for displaying data entered through the monitor and through the keyboard as well as data developed by the processing unit in accordance with the program contained in the memory.