COMPLEX SUBSCRIBER LINE TEST BOARD

摘要

PURPOSE: A complex subscriber line test board is provided to improve service reliability in a digital communication interval and identify a disturbance generation line by providing a digital test pattern to a line in which a loop is formed and comparing and judging a returned state. CONSTITUTION: A time switch(240) monitors and controls a state of a digital subscriber matching unit(200) through an IOM-2 bus and controls each communication channel so that the communication channel forms a loop back. A test pattern generating unit(250) generates a test pattern to be provided to the second subscriber line, provides the generated test pattern to the time switch(240), and receives the returned test pattern. A comparing and judging unit(260) compares the first generated test pattern provided from the test pattern unit(250) with the returned test pattern to be provided to the second line. If the first generated test pattern provided from the test pattern unit(250) is not identical to the returned test pattern, the comparing and judging unit(260) judges that a disturbance is generated and identifies a corresponding disturbance generation state to inform the identified disturbance generation state to a CPU(235). A mode converting unit(270) is connected with the digital subscriber matching unit(200) for communicating with the second terminal connected with the second subscriber line or the first ISDN terminal.