TEST METHOD OF THREE-PARTY TALKING DEVICE

摘要

PURPOSE:To attain economically and accurately the test of a three-party talking device by inputting three pieces of test information stored in the 1st memory to the three-party talking device and collating the synthesized output information written in the 2nd memory with the input information of the 1st memory. CONSTITUTION:Three pieces of test information are stored in a memory SSM from a CPU in a digital exchange system provided with the 3-party talking device TWT. The information in the SSM is read at an optional time slot and inputted to input terminals a, b, c of the device TWT. The device TWT decodes DEC the three input information, they are added and synthesized (ADD), the output is coded (COD), outputted from terminals d, e, f and stored in the memory RSM. The CPU reads the information in the memory RSM and collated with the information to be outputted substantially by using the information written in the memory SSM. Thus, a fault such as bit error of the device TWT is detected easily.