A device that can check the port error status at the DSLAM side or measure the speed at the PC after checking the ADSL MODEM SYNC status, by connecting the test line towards the DSLAM after cutting the outer line at the MDF side, connecting to the test board MDF line operated at the laboratory. ? The device was developed to comprehensively operate five types of ADSL modems. It is an ADSL access device, enabling the test board user to cut the LAN line and the ADSL test line just by easy button operation.