| 摘要 |
Supplemental equipment is introduced into the connecting circuit function of a telephone station to enable repeated local tolling of the station's subscribers. Said equipment contains two miniature relays 27, 28, each one provided with a winding. The relays are arranged on a card 1, to which is connected a first conductor m1. A time interval detector TIG sends out tolling pulses via said conductor. Via a second conductor m2, the time interval detector sends out a plus pulse after each tolling pulse. With the help of the plus pulse after the first tolling pulse and said first and second miniature relays, the first tolling pulse put out after the B- response in the connection in which the particular connecting circuit is occupied is cancelled. The tolling pulses which follow said first tolling pulse are repeated by the supplemental equipment for the A-subscriber's call meter ASM. The supplemental equipment also initiates the incrementing of the call meter which will occur in conjunction with the B-response. <IMAGE> |
