| 摘要 |
PURPOSE:To take a maintenance diagnosis rapidly without influencing real-time service by storing all information passed through a common signal bus and by tracing operation hysteresis by reading the stored information upon occasion. CONSTITUTION:Synchronizing with information transferred from BUS, RWC stores the information in BR. This information is stored in an assigned address of MEM with the output of AC of MEM. After the storage is continued up to final address N equivalent to storage capacity N of MEM, the storage of the following information starts at the initial address again successively. Once ALM detects an abnormal operation state of a telephone exchange, AL is sent out. Then, RWC having received this AL stops the storage of the following information, arriving via BUS, in MEM. When a person in charge of maintenance actuates PR attached to TRR, RWC, while driving frozen AC again, reads and outputs N pieces of information stored in MEM to PR. |
