| 摘要 |
PURPOSE:To attain a pseudo call test through on-line without the need of any provision out the outside of an exchange by allowing a control section of a subscriber circuit device to apply a pseudo call processing such as calling, dialing and reply. CONSTITUTION:Off-hook information is given from a loop information inserting circuit 11 of a subscriber circuti device 17 at the calling side to make a call. Then a control section 13 receives a line concentration switch control order sent from a central controller 16 to confirm a dial tone, a dial pulse is sent from a loop information inserting circuit 11 for dialing. A subscriber circuit device 18 receives an SD point order to confirm an incoming call, gives off-hook information from the loop information inserting circuit 12 for reply. Then a tone transmission circuit 8 and a channel swith 15 are connected via a line concentration switch 6 to send a tone. Through the operation above, a pseudo call test is performed. |
