| 摘要 |
PURPOSE:To establish the call sequence test unit making unnecessary the drawing in of lines, by monitoring the call sequence with the status of control unit. CONSTITUTION:The instruction of test circuit is made from the keyboard KB of test unit CST to the control unit SCU via the communication line SW in advance. When the status of call is indicated on line, the status of the said line is call even in the control unit SCU, and the instruction performing the lamp display of call is made to CST via SCU communication path SW lamp display circuit LAMP of call sequence test unit CST to illuminate the call lamp. Next, when the call confirmation signal CLL-CFM is made from the exchanger, the status of the said line of SCU is changed into CLL-CFM status, and the lamp display instruction of CLL- CFM is made in the path of SCU SW LAMP of CST to illuminate the lamp. |
