Abstract: A universal line driver interface which enables a digital telephone computer/telephony interface to configure itself automatically or on the fly to accommodate different PBXs. The interface is connected to a PBX and to a digital telephone. The interface also is connected to network interface logic. A microcontroller, which is part of the computer in the computer telephony system, is connected in controlling relation to the interface and to the interface logic. The microcontroller under program control changes operational parameters in the interface as a function of electrical characteristics of the particular type of PBX to which the interface is connected. The changes in operation parameters of the interface, in turn, are used to configure the interface logic depending upon the type of PBX. The universal nature of the interface is achieved by adaptability to different transmission and receiver voltage, levels and an ability to match a range of telephone line impedances.

Abstract: In a telephone network including a PBX connected between a central/public office switch and one or more terminals where a computer telephony interface is connected to the PBX, a system operatively associated with the computer telephony interface and responsive to an operational characteristic of the PBX for sensing, detecting and identifying the type of PBX connected to the computer telephony interface. The operational characteristic utilized is the DC power levels for various PBXs. The system automatically senses, detects and identifies the type of PBX which is connected to the computer telephony interface. Automation of this procedure simplifies the user interface by providing the computer telephony interface with information which it can then use to configure itself and function in the required mode without having any type of user input.