DIGITAL TRUNK CIRCUIT SUPPORTIVE OF MANY TRUNK FUNCTIONS

摘要

PURPOSE: A digital trunk circuit is provided to be formed in a board and to support many trunk functions. CONSTITUTION: The digital trunk circuit comprises; a trunk selection part(21) to output trunk selection information for selecting a trunk circuit corresponding to the manipulation of the user; a ROM storing many drive programs to drive many trunk circuits respectively; a framer and a line interface function part to act as a T1 framer or E1 framer by the change of the register value and equipped with a line interface terminal; a transformer connected to the local line and receiving signals from the local line; a relay switching part providing a transmitting channel between a line interface terminal and a transmitting transformer.