TEST APPARATUS FOR MESSAGE LINE OF PBX AND ITGS

摘要

PURPOSE: A speech path test apparatus of a PBX(Private Branch eXchange) or an ITGS(IP Telephony Gateways System) is provided to check the state of a subscriber's speech path directly at PBX or an ITGS, without the necessity of using a special measuring equipment. CONSTITUTION: A test equipment(20) of a PBX or an ITGS consists of a test controller(23), a tone generator(21), a received tone interpreter(29), an auto gain controller(24), a filter(25), a frequency converter(26), a DC voltage converter(27), and a digital multimeter(28). The test controller(23) receives a command, inputted from an operator, through a serial input/output part(22) and outputs a control signal. The tone generator(21) generates a test tone according to the control of the test controller(23). The received tone interpreter(29) converts a received tone into a digital signal and supplies it to the operator's computer(30) through the test controller(23) and the serial input/output part(22). The auto gain controller(24) receives a tone from a measured board(10), and controls and outputs the gain of the tone. The filter(25) removes out-of-band components from the gain-controlled composite frequency tone outputted from the auto gain controller(24). The frequency converter(26) extracts a pure composite frequency component from the filtered tone. The DC voltage converter(27) receives the output signal of the frequency converter(26) and changes AC effective voltage into DC voltage. The digital multimeter(28) measures a DC voltage component from the output of the DC voltage converter(27) and outputs the measured data to the computer(30) through the test controller(23) and the serial input/output part(22).