| 摘要 |
PURPOSE:To check the disconnection of a terminating trunk line by originating a call from the PBX side to the terminating trunk line of the PBX adopting the group number system and confirming the arrival of a call signal in the PBX side. CONSTITUTION:An automatic dialing set AD is started at the time, when the group number system is switched to the direct number system by a clock device TIM and transmits dial signal corresponding to individual numbers ''111-1234''- ''111-123n'' successively. A test line control part CONT switches trunks from the side of trunks ICT to the side of a call signal detecting part DET in accordance with individual numbers. The call signal detecting part DET monitors whether the call signal of 16Hz is detected within a prescribed time or not, thereby judging lines to be good or defective. |
